fix(deps): update github.com/gomarkdown/markdown digest to a660076

Update github.com/gomarkdown/markdown digest to 7b278df

.circleci/config.yml

@@ -1,30 +0,0 @@
-version: 2
-jobs:
-  build:
-    docker:
-      - image: circleci/golang:1.12
-    steps:
-      - checkout
-      - run: make compile
-  release:
-    docker:
-      - image: circleci/golang:1.12
-    steps:
-      - checkout
-      - run: curl -sL https://git.io/goreleaser | bash
-workflows:
-  version: 2
-  build_and_release:
-    jobs:
-      - build:
-          filters:
-              tags:
-                only: /.*/
-      - release:
-          requires:
-            - build
-          filters:
-            branches:
-              ignore: /.*/
-            tags:
-              only: /^v.*$/

.drone.yml

@@ -0,0 +1,109 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+platform:
+  os: linux
+  arch: arm64
+
+trigger:
+  branch: 
+  - main
+  event:
+    - push
+    - pull_request
+    - tag
+
+steps:
+  - name: Lint
+    image: docker.io/golangci/golangci-lint:latest
+    environment:
+      GO111MODULE: "on"
+      CGO_ENABLED: "0"
+      GOMEMLIMIT: "1150MiB"
+    volumes:
+      - name: go-cache
+        path: /go
+    commands:
+      - golangci-lint run -v
+
+  - name: Test
+    image: docker.io/golang:1.21-bullseye
+    network_mode: host
+    environment:
+      GO111MODULE: "on"
+      CGO_ENABLED: "1"
+    volumes:
+      - name: go-cache
+        path: /go
+    commands:
+      - go install gotest.tools/gotestsum@latest
+      - sh -c "$(curl --location https://taskfile.dev/install.sh)" -- -d -b /usr/local/bin
+      - task test
+
+  - name: Snapshot release
+    image: ghcr.io/goreleaser/goreleaser
+    when:
+      event:
+        - push
+        - pull_request
+    volumes:
+      - name: go-cache
+        path: /go
+    commands:
+      - goreleaser release --clean --snapshot
+
+  - name: Release
+    image: ghcr.io/goreleaser/goreleaser
+    when:
+      event:
+        - tag
+    volumes:
+      - name: go-cache
+        path: /go
+    commands:
+      - apk add -U --no-cache git-lfs
+      - git lfs install
+      - git fetch --tags
+      - git lfs pull
+      - docker login -u prskr -p "$${GITEA_TOKEN}" code.icb4dc0.de
+      - goreleaser release --clean
+    environment:
+        GITEA_TOKEN:
+            from_secret: gitea_token
+    network_mode: host
+
+volumes:
+  - name: go-cache
+    temp: { }
+
+---
+kind: pipeline
+type: docker
+name: housekeeping
+
+platform:
+  os: linux
+  arch: arm64
+
+trigger:
+  event:
+    - cron
+  cron:
+    - housekeeping
+
+steps:
+  - name: Renovate
+    image: code.icb4dc0.de/prskr/ci-images/renovate:latest
+    commands:
+      - renovate "${DRONE_REPO}"
+    environment:
+      RENOVATE_TOKEN:
+        from_secret: gitea_token
+      GITHUB_COM_TOKEN:
+        from_secret: github_token
+      RENOVATE_PLATFORM: gitea
+      RENOVATE_AUTODISCOVER: "false"
+      RENOVATE_ENDPOINT: https://code.icb4dc0.de/api/v1
+      LOG_LEVEL: info

.editorconfig

@@ -0,0 +1,27 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+tab_width = 4
+indent_style = space
+insert_final_newline = false
+max_line_length = 120
+trim_trailing_whitespace = true
+
+[*.go]
+indent_style = tab
+ij_smart_tabs = true
+ij_go_GROUP_CURRENT_PROJECT_IMPORTS = true
+ij_go_group_stdlib_imports = true
+ij_go_import_sorting = goimports
+ij_go_local_group_mode = project
+ij_go_move_all_imports_in_one_declaration = true
+ij_go_move_all_stdlib_imports_in_one_group = true
+ij_go_remove_redundant_import_aliases = true
+
+[*.{yml,yaml}]
+indent_size = 2
+tab_width = 2
+insert_final_newline = true

.gitattributes

@@ -0,0 +1 @@
+*.jpg filter=lfs diff=lfs merge=lfs -text

.gitea/workflows/go.yaml

@@ -0,0 +1,36 @@
+name: Go build
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: '0'
+          lfs: 'true'
+          fetch-tags: 'true'
+      - name: Setup Go 1.21.x
+        uses: actions/setup-go@v4
+        with:
+          # Semantic version range syntax or exact version of Go
+          go-version: '1.21.x'
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+      - name: Install Task
+        uses: arduino/setup-task@v1
+      - run: |
+          go install gotest.tools/gotestsum@latest
+          task test
+      - uses: goreleaser/goreleaser-action@v4
+        if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
+        with:
+          distribution: goreleaser
+          version: latest
+          args: release --clean --snapshot

.gitea/workflows/renovate.yaml

@@ -0,0 +1,21 @@
+name: Renovate
+on:
+  schedule:
+    # The "*" (#42, asterisk) character has special semantics in YAML, so this
+    # string has to be quoted.
+    - cron: '42 3 * * *'
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: docker://code.icb4dc0.de/prskr/ci-images/renovate:latest
+        with:
+          args: renovate "${{ github.repository }}"
+        env:
+          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
+          GITHUB_COM_TOKEN: ${{ secrets.RENOVATE_GITHUB_TOKEN }}
+          RENOVATE_PLATFORM: gitea
+          RENOVATE_AUTODISCOVER: "false"
+          RENOVATE_ENDPOINT: https://code.icb4dc0.de/api/v1
+          LOG_LEVEL: info

.gitignore

@@ -5,6 +5,8 @@
 *.so
 *.dylib
 
+emoji.json
+
 # Test binary, build with `go test -c`
 *.test
 
@@ -18,14 +20,17 @@
 .vscode/
 .history
 
-assets/reveal
+# CI
+bin/
 
-# packr2 generated
-*-packr.go
+assets/reveal/
+assets/mermaid/
+assets/twemoji/
 
-# binaries
-goveal
-!goveal/
+pkged.go
 
 # gorelease
-dist/
+dist/
+
+#Taskfile
+.task/

.golangci.yml

@@ -0,0 +1,125 @@
+linters-settings:
+  dupl:
+    threshold: 100
+  funlen:
+    lines: 100
+    statements: 50
+  gci:
+    local-prefixes: code.icb4dc0.de/prskr/goveal
+  goconst:
+    min-len: 2
+    min-occurrences: 2
+  gocritic:
+    enabled-tags:
+      - diagnostic
+      - opinionated
+      - performance
+    disabled-checks:
+      - ifElseChain
+      - octalLiteral
+      - wrapperFunc
+    settings:
+      hugeParam:
+        sizeThreshold: 200
+  gocyclo:
+    min-complexity: 15
+  goimports:
+    local-prefixes: code.icb4dc0.de/prskr/goveal
+  golint:
+    min-confidence: 0
+  gomnd:
+    settings:
+      mnd:
+        # don't include the "operation" and "assign"
+        checks:
+          - argument
+          - case
+          - condition
+          - return
+  govet:
+    check-shadowing: true
+  importas:
+    no-unaliased: true
+    alias: []
+  lll:
+    line-length: 140
+  maligned:
+    suggest-new: true
+  misspell:
+    locale: US
+  nolintlint:
+    allow-leading-space: true # don't require machine-readable nolint directives (i.e. with no leading space)
+    allow-unused: false # report any unused nolint directives
+    require-explanation: false # don't require an explanation for nolint directives
+    require-specific: false # don't require nolint directives to be specific about which linter is being skipped
+
+linters:
+  # please, do not use `enable-all`: it's deprecated and will be removed soon.
+  # inverted configuration with `enable-all` and `disable` is not scalable during updates of golangci-lint
+  disable-all: true
+  enable:
+    - contextcheck
+    - dogsled
+    - dupl
+    - errcheck
+    - errchkjson
+    - errname
+    - errorlint
+    - exhaustive
+    - exportloopref
+    - funlen
+    - gocognit
+    - goconst
+    # - gocritic
+    - gocyclo
+    - godox
+    - gofumpt
+    - goimports
+    - gomoddirectives
+    - gomnd
+    - gosec
+    - gosimple
+    - govet
+    - importas
+    - ineffassign
+    # - ireturn - enable later
+    - lll
+    - misspell
+    - nakedret
+    - nestif
+    - nilnil
+    - noctx
+    - nolintlint
+    - paralleltest
+    - prealloc
+    - predeclared
+    - promlinter
+    - staticcheck
+    - stylecheck
+    - testpackage
+    - thelper
+    # - typecheck
+    - unconvert
+    - unparam
+    - whitespace
+    - unused
+    - wastedassign
+
+issues:
+  # Excluding configuration per-path, per-linter, per-text and per-source
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - gomnd
+        - funlen
+  new: true
+  fix: true
+
+run:
+  build-tags:
+    - sudo
+  skip-dirs:
+    - internal/mock
+  skip-files:
+    - ".*\\.pb\\.go$"
+    - ".*.mock.\\.go$"

.goreleaser.yml

@@ -1,14 +1,10 @@
 project_name: goveal
-before:
-  hooks:
-    - mkdir -p ./assets/reveal
-    - ./download_revealjs.sh
-    - go mod download
-    - go build -v ./...
-    - go get -u github.com/gobuffalo/packr/v2/packr2
-    - packr2
+gitea_urls:
+  api: https://code.icb4dc0.de/api/v1
+  download: https://code.icb4dc0.de
 builds:
-  - main: ./cmd/goveal/main.go
+  - id: goveal
+    main: ./cmd/goveal/
     binary: goveal
     goos:
       - linux
@@ -24,18 +20,33 @@ builds:
       - CGO_ENABLED=0
     ignore:
       - goos: darwin
-        goarch: 386
+        goarch: '386'
       - goos: linux
         goarch: arm
-        goarm: 7
+        goarm: '7'
+
+release:
+  gitea:
+    owner: prskr
+    name: goveal
+  mode: replace
+
+kos:
+  - id: goveal
+    build: goveal
+    base_image: gcr.io/distroless/static:nonroot
+    repository: code.icb4dc0.de/prskr/goveal
+    platforms:
+      - linux/amd64
+      - linux/arm64
+    tags:
+      - latest
+      - '{{.Tag}}'
+    bare: true
+    base_import_paths: true
+
 archives:
-  - replacements:
-      darwin: Darwin
-      linux: Linux
-      windows: Windows
-      386: i386
-      amd64: x86_64
-    format_overrides:
+  - format_overrides:
       - goos: windows
         format: zip
     files:

.pre-commit-config.yaml

@@ -0,0 +1,18 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+  - repo: https://github.com/tekwizely/pre-commit-golang
+    rev: v1.0.0-beta.5
+    hooks:
+      - id: go-mod-tidy-repo
+      - id: go-fumpt
+        args:
+          - -w
+      - id: go-imports
+        args:
+          - -local=github.com/baez90/goveal
+          - -w
+      - id: golangci-lint-repo-mod
+        args:
+          - --fast
+          - --fix

Makefile

@@ -1,119 +0,0 @@
-VERSION = $(shell git describe --dirty --tags --always)
-REPO = github.com/baez90/go-reveal-slides
-BUILD_PATH = $(REPO)/cmd/goveal
-PKGS = $(shell go list ./... | grep -v /vendor/)
-TEST_PKGS = $(shell find . -type f -name "*_test.go" -printf '%h\n' | sort -u)
-GOARGS = GOOS=linux GOARCH=amd64
-GO_BUILD_ARGS = -ldflags="-w -s"
-BINARY_NAME = goveal
-DIR = $(dir $(realpath $(firstword $(MAKEFILE_LIST))))
-DEBUG_PORT = 2345
-
-REVEALJS_VERSION = 3.8.0
-GORELEASER_VERSION = 0.106.0
-
-.PHONY: all clean clean-all clean-vendor rebuild format revive test deps compile run debug watch watch-test cloc docs serve-docs serve-godoc ensure-revive ensure-reflex ensure-delve ensure-godoc ensure-packr2 ensure-goreleaser
-
-export CGO_ENABLED:=0
-
-all: format compile
-
-clean-all: clean clean-vendor
-
-rebuild: clean format compile
-
-format:
-	@go fmt $(PKGS)
-
-revive: ensure-revive
-	@revive --config $(DIR)assets/lint/config.toml -exclude $(DIR)vendor/... -formatter friendly $(DIR)...
-
-clean: ensure-packr2
-	@rm -f debug $(BINARY_NAME)
-	@rm -rf dist
-	@packr2 clean
-
-clean-vendor:
-	rm -rf vendor/
-
-test:
-	@go test -coverprofile=./cov-raw.out -v $(TEST_PKGS)
-	@cat ./cov-raw.out | grep -v "generated" > ./cov.out
-
-cli-cover-report:
-	@go tool cover -func=cov.out
-
-html-cover-report:
-	@go tool cover -html=cov.out -o .coverage.html
-
-deps:
-	@go build -v ./...
-
-compile: deps ensure-packr2
-	@$(GOARGS) packr2 build $(GO_BUILD_ARGS) -o $(DIR)/$(BINARY_NAME) $(BUILD_PATH)
-
-run:
-	@go run $(BUILD_PATH)
-
-debug: ensure-delve
-	@dlv debug \
-		--headless \
-		--listen=127.10.10.2:$(DEBUG_PORT) \
-		--api-version=2 $(BUILD_PATH) \
-		--build-flags="-tags debug" \
-		-- serve --config ./examples/goveal.yaml $(DIR)/examples/slides.md
-
-download-reveal:
-	@mkdir -p $(DIR)/assets/reveal
-	@curl -sL https://github.com/hakimel/reveal.js/archive/$(REVEALJS_VERSION).tar.gz | tar -xvz --strip-components=1 -C $(DIR)/assets/reveal --wildcards "*.js" --wildcards "*.css" --exclude "test" --exclude "gruntfile.js"
-
-watch: ensure-reflex
-	@reflex -r '\.go$$' -s -- sh -c 'make debug'
-
-watch-test: ensure-reflex
-	@reflex -r '_test\.go$$' -s -- sh -c 'make test'
-
-cloc:
-	@cloc --vcs=git --exclude-dir=.idea,.vscode,.theia,public,docs, .
-
-serve-godoc: ensure-godoc
-	@godoc -http=:6060
-
-serve-docs: ensure-reflex docs
-	@reflex -r '\.md$$' -s -- sh -c 'mdbook serve -d $(DIR)/public -n 127.0.0.1 $(DIR)/docs'
-
-docs:
-	@mdbook build -d $(DIR)/public $(DIR)/docs`
-
-test-release: ensure-goreleaser ensure-packr2
-	@goreleaser --snapshot --skip-publish --rm-dist
-
-ensure-revive:
-ifeq (, $(shell which revive))
-	$(shell go get -u github.com/mgechev/revive)
-endif
-
-ensure-delve:
-ifeq (, $(shell which dlv))
-	$(shell go get -u github.com/go-delve/delve/cmd/dlv)
-endif
-
-ensure-reflex:
-ifeq (, $(shell which reflex))
-	$(shell go get -u github.com/cespare/reflex)
-endif
-
-ensure-godoc:
-ifeq (, $(shell which godoc))
-	$(shell go get -u golang.org/x/tools/cmd/godoc)
-endif
-
-ensure-packr2:
-ifeq (, $(shell which packr2))
-	$(shell go get -u github.com/gobuffalo/packr/v2/packr2)
-endif
-
-ensure-goreleaser:
-ifeq (, $(shell which goreleaser))
-	$(shell curl -sL https://github.com/goreleaser/goreleaser/releases/download/v$(GORELEASER_VERSION)/goreleaser_Linux_x86_64.tar.gz | tar -xvz --exclude "*.md" -C $$GOPATH/bin)
-endif

README.md

@@ -1,35 +1,124 @@
 # Goveal
 
-Goveal is very small an very simple tool that reads Markdown from a given file, renders  it into a HTML template and serves it as local HTTP server.
-Right now Goveal uses Reveal.js 3.8.0 to create presentations and therefore also includes all features of Reveal.js 3.8.0.
+[![Actions Status](https://github.com/baez90/goveal/workflows/Go/badge.svg)](https://github.com/baez90/goveal/actions)
+
+Goveal is very small and very simple tool that reads Markdown from a given file, renders it into an HTML template and serves it as local HTTP server.
+Right now Goveal uses Reveal.js 4.3.0 to create presentations and therefore also includes all features of Reveal.js.
+
+In contrary to Reveal.js `goveal` ships with its own Markdown parser and renderer which is why some features are working slightly different from Reveal.js.
+See [Markdown](#markdown) for further details.
+
+Besides all features from Reveal.js `goveal` comes with first class support for [mermaid-js](https://mermaid-js.github.io/).
+Just inline your diagrams as code and enjoy!
+An example can be found in the [examples](examples/slides.md).
+
+## Install
+
+The easiest and fastest way to install Goveal is to use a pre-built binary from the [releases](https://github.com/baez90/goveal/releases/latest).
+
+There's also a pre-built container image available you can use if you don't want to download the binary.
+
+### Build from source
+
+If you have Go in the latest version installed you can also build your own version of Goveal:
+
+```shell
+task build
+```
+
+Requirements:
+
+- [task](https://taskfile.dev/)
+- _Optional:_ [goreleaser](https://goreleaser.com/) (for `task snapshot-release` to build all binaries)
+
+_Note: All script tasks in the [Taskfile.yml](Taskfile.yml) are meant to be executed with Linux/MacOS. Binaries for
+Windows are provided but not tested!_
 
 ## Usage
 
-The easiest way to use `goveal` is to download a release, and run it from your `$PATH`.
+### Local installation
 
 ```bash
 goveal serve ./slides.md
 ```
 
-| Param                    | Description                                   | Default value           |
-| ------------------------ | --------------------------------------------- | ----------------------- |
-| `--host`                 | Hostname the binary is listening on           | `localhost`             |
-| `--port`                 | Port the binary is listening on               | `2233`                  |
-| `--code-theme`           | highlight.js theme to use                     | `monokai`               |
-| `--config`               | Path to the config file see [config](#config) | `$HOME/goveal:./goveal` |
-| `-h` / `--help`          | shows help                                    |                         |
-| `--horizontal-separator` | horizontal separator to split slides          | `===`                   |
-| `--vertical-separator`   | vertical separator to split slides            | `---`                   |
-| `--theme`                | reveal.js theme to use                        | `white`                 |
+| Param            | Description                                   | Default value           |
+|------------------|-----------------------------------------------|-------------------------|
+| `--host`         | Hostname the binary is listening on           | `127.0.0.1`             |
+| `--port`         | Port the binary is listening on               | `2233`                  |
+| `--config`       | Path to the config file see [config](#config) | `$HOME/goveal:./goveal` |
+| `--open-browser` | Open a browser after starting the web server  | `true`                  |
+| `-h` / `--help`  | shows help                                    |                         |
+
+### Container
+
+Assuming your slides are in a file called `slides.md` in the current directory, you can start the presentation like
+this:
+
+```shell
+podman/docker run --rm -ti -v `pwd`:/work -w /work -p 2233:2233 ghcr.io/baez90/goveal:0 serve --host 0.0.0.0 slides.md
+```
+
+By default `goveal` only listens on `127.0.0.1`. To allow traffic from outside the container you've to change the
+binding to `0.0.0.0`.
 
 ## Config
 
-Goveal supports multiple configuration mechanisms.
-It tries to load a configuration file from `$HOME` or from `.` i.e. `$HOME/goveal.yaml` or `$HOME/goveal.yml` or `./goveal.yaml` and so on.
+Goveal supports multiple configuration mechanisms. It tries to load a configuration file from `$HOME` or from `.`
+i.e. `$HOME/goveal.yaml` or `$HOME/goveal.yml` or `./goveal.yaml` and so on.
 
-Most options that can be set via commandline flags can also be set via configuration file (actually all but the `--config` switch does not make sense in the configuration file, does it? :wink:).
-It is more a convenience feature to be able to set a theme and so on and so forth for the presentation without having to pass it every time as parameter.
+The config allows setting a lot of options exposed by Reveal.js.
+There are still a few missing, and I won't guarantee to support all options in the future.
 
-Furthermore goveal supports configuration hot reloading i.e. you can play around with different themes and the rendered theme will be changed whenever you hit the save button!
+Furthermore, `goveal` supports configuration hot reloading i.e. you can play around with different themes and the rendered
+theme will be changed whenever you hit the save button!
 
-See also an example at [`./examples/goveal.yaml`](./examples/goveal.yaml).
+See also an example at [`./examples/goveal.yaml`](./examples/goveal.yaml).
+I try to keep the example up to date to cover **all** supported config options as kind of documentation.
+
+## Markdown
+
+A good point to start is the [slides.md](examples/slides.md) in the `examples` directory.
+I try to showcase everything possible with `goveal` in this presentation.
+
+The most remarkable difference between `goveal` and the `marked` driven Reveal.js markdown is how line numbers in listings are working:
+
+Reveal.js:
+
+<pre lang="no-highlight"><code>```cs [1-2|3|4]
+var i = 10;
+for (var j = 0; j < i; j++) {
+    Console.WriteLine($"{j}");
+}
+```</code></pre>
+
+`goveal`:
+
+<pre lang="no-highlight"><code>
+{line-numbers="1-2|3|4"}
+```cs
+var i = 10;
+for (var j = 0; j < i; j++) {
+    Console.WriteLine($"{j}");
+}
+```</code></pre>
+
+This is because the Markdown parser used in `goveal` currently does not support additional attributes for code blocks.
+
+## Custom CSS
+
+To add custom CSS as theme overrides use a config file and add the `stylesheets` property. It takes a list of relative (
+mandatory!) paths to CSS files that are included automatacally after the page was loaded so that they really overload
+everything added by Reveal and plugins.
+
+Changes in the custom CSS files are monitored and propagated via SSE to the presentation immediately. 
+No page reload necessary!
+
+The sample configuration file [`./examples/goveal.yaml`](./examples/goveal.yaml) also contains a sample how to add
+custom CSS.
+
+## Emojis
+
+Aside of UTF character emojis `goveal` also supports emoji references like Github flavored markdown supports them.
+For example`:winking_face:` becomes :winking_face: .
+All supported keywords can be found [here](https://unpkg.com/emojilib@latest).

Taskfile.yml

@@ -0,0 +1,128 @@
+version: '3'
+
+vars:
+  DEBUG_PORT: 2345
+  REVEALJS_VERSION: 4.3.0
+  HIGHLIGHTJS_VERSION: 11.5.0
+  MERMAID_VERSION: 8.14.0
+  BINARY_NAME: goveal
+  OUT_DIR: ./out
+  GO_BUILD_ARGS: -ldflags="-w -s"
+  CMD_PACKAGE: github.com/baez90/goveal/cmd/goveal
+
+env:
+  CGO_ENABLED: 0
+  GOBIN:
+    sh: echo "$(pwd)/bin/"
+
+tasks:
+  clean:
+    cmds:
+      - rm -f debug {{ .BINARY_NAME }}
+      - rm -rf ./dist {{ .OUT_DIR }}
+
+  fmt:
+    desc: Run gofumpt against code
+    deps:
+      - gofumpt
+      - goimports
+    sources:
+      - "**/*.go"
+    cmds:
+      - "{{ .GOBIN }}gofumpt -l -w ./"
+      - "{{ .GOBIN }}goimports -w -local github.com/baez90/goveal ./."
+
+  deps:
+    deps:
+      - download-assets
+    sources:
+      - go.mod
+      - go.sum
+    cmds:
+      - go mod download
+      - go mod tidy -compat=1.21
+
+  test:
+    sources:
+      - ./**/*.go
+    deps:
+      - deps
+      - fmt
+    cmds:
+      - mkdir -p {{ .OUT_DIR }}
+      - go test -coverprofile={{ .OUT_DIR }}/cov-raw.out -v ./...
+      - cat {{ .OUT_DIR }}/cov-raw.out | grep -v "generated" > {{ .OUT_DIR }}/cov.out
+
+  cli-cover-report:
+    deps:
+      - test
+    cmds:
+      - go tool cover -func={{ .OUT_DIR }}/cov.out
+
+  html-cover-report:
+    deps:
+      - test
+    cmds:
+      - go tool cover -html={{ .OUT_DIR }}/cov.out -o {{ .OUT_DIR }}/coverage.html
+
+  build:
+    deps:
+      - deps
+    sources:
+      - ./**/*.go
+    cmds:
+      - go build {{ .GO_BUILD_ARGS }} -o  {{ .BINARY_NAME }} {{ .CMD_PACKAGE }}
+
+  run:
+    deps:
+      - deps
+    dir: ./examples
+    cmds:
+      - go run {{ .CMD_PACKAGE }} serve ./slides.md --config ./goveal.yaml
+
+  debug:
+    cmds:
+      - dlv debug --headless --listen=127.10.10.2:{{ .DEBUG_PORT }} --api-version=2 {{ .CMD_PACKAGE }} --build-flags="-tags debug" -- serve --config ./examples/goveal.yaml ./examples/slides.md
+
+  snapshot-release:
+    cmds:
+      - goreleaser --snapshot --skip-publish --rm-dist
+
+  download-assets:
+    sources:
+      - Taskfile.yml
+    cmds:
+      - rm -rf ./assets/reveal
+      - mkdir -p ./assets/reveal ./assets/mermaid
+      - curl -sL https://github.com/hakimel/reveal.js/archive/{{ .REVEALJS_VERSION }}.tar.gz | tar -xvz --strip-components=1 -C ./assets/reveal --wildcards "*.js" --wildcards "*.css" --wildcards "*.html" --wildcards "*.woff" --wildcards "*.ttf" --exclude "test" --exclude "gulpfile.js" --exclude "gruntfile.js"  --exclude "demo.html" --exclude "index.html" --exclude "examples/*.html"
+      - mkdir -p ./assets/reveal/plugin/menu ./assets/reveal/plugin/mouse-pointer
+      - git clone https://github.com/denehyg/reveal.js-menu.git ./assets/reveal/plugin/menu
+      - curl -L -o ./assets/reveal/plugin/mouse-pointer/mouse-pointer.js https://raw.githubusercontent.com/caiofcm/plugin-revealjs-mouse-pointer/master/mouse-pointer.js
+      - rm -f ./assets/reveal/plugin/menu/{bower.json,CONTRIBUTING.md,LICENSE,package.json,README.md,.gitignore,gulpfile.js,package-lock.json}
+      - curl -L https://github.com/highlightjs/highlight.js/archive/{{ .HIGHLIGHTJS_VERSION }}.tar.gz | tar -xvz --strip-components=3 -C ./assets/reveal/plugin/highlight --wildcards "*.css" highlight.js-{{ .HIGHLIGHTJS_VERSION }}/src/styles/
+      - curl -L https://registry.npmjs.org/mermaid/-/mermaid-{{ .MERMAID_VERSION }}.tgz | tar -xvz -C ./assets/mermaid/ package/dist --strip-components=2
+      - curl -L -o rendering/emoji/emoji.json https://unpkg.com/emojilib@latest
+
+  go-get-tool:
+    vars:
+      PACKAGE: '{{ default "" .PACKAGE }}'
+    cmds:
+      - go install {{ .PACKAGE }}
+
+  gofumpt:
+    desc: Download gofumpt locally if necessary
+    cmds:
+      - task: go-get-tool
+        vars:
+          PACKAGE: mvdan.cc/gofumpt@v0.2.0
+    status:
+      - test -f {{ .GOBIN }}gofumpt
+
+  goimports:
+    desc: Download goimports locally if necessary
+    cmds:
+      - task: go-get-tool
+        vars:
+          PACKAGE: golang.org/x/tools/cmd/goimports@v0.1.7
+    status:
+      - test -f {{ .GOBIN }}goimports

api/config.go

@@ -0,0 +1,36 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/julienschmidt/httprouter"
+
+	"code.icb4dc0.de/prskr/goveal/config"
+)
+
+type ConfigAPI struct {
+	cfg *config.Components
+}
+
+func RegisterConfigAPI(router *httprouter.Router, cfg *config.Components) {
+	cfgAPI := &ConfigAPI{cfg: cfg}
+	router.GET("/api/v1/config/reveal", cfgAPI.RevealConfig)
+	router.GET("/api/v1/config/mermaid", cfgAPI.MermaidConfig)
+}
+
+func (a *ConfigAPI) RevealConfig(writer http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
+	writer.Header().Set("Content-Type", "application/json")
+	enc := json.NewEncoder(writer)
+	if err := enc.Encode(a.cfg.Reveal); err != nil {
+		writer.WriteHeader(http.StatusInternalServerError)
+	}
+}
+
+func (a *ConfigAPI) MermaidConfig(writer http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
+	writer.Header().Set("Content-Type", "application/json")
+	enc := json.NewEncoder(writer)
+	if err := enc.Encode(a.cfg.Mermaid); err != nil {
+		http.Error(writer, err.Error(), http.StatusInternalServerError)
+	}
+}

api/events.go

@@ -0,0 +1,92 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/julienschmidt/httprouter"
+	log "github.com/sirupsen/logrus"
+
+	"code.icb4dc0.de/prskr/goveal/events"
+)
+
+type ContentEventHandler chan events.ContentEvent
+
+func (h ContentEventHandler) OnEvent(ce events.ContentEvent) error {
+	const enqueueTimeout = 50 * time.Millisecond
+	select {
+	case h <- ce:
+		return nil
+	case <-time.After(enqueueTimeout):
+		return errors.New("failed to enqueue due to timeout")
+	}
+}
+
+func (h ContentEventHandler) Close() (err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			err = fmt.Errorf("failed to close event handler: %v", rec)
+		}
+	}()
+
+	close(h)
+	return
+}
+
+type Events struct {
+	logger *log.Logger
+	hub    *events.EventHub
+}
+
+func RegisterEventsAPI(router *httprouter.Router, hub *events.EventHub, logger *log.Logger) {
+	ev := &Events{hub: hub, logger: logger}
+	router.GET("/api/v1/events", ev.EventHandler)
+}
+
+func (e *Events) EventHandler(writer http.ResponseWriter, req *http.Request, _ httprouter.Params) {
+	writer.Header().Set("Content-Type", "text/event-stream")
+	writer.Header().Set("Cache-Control", "no-cache")
+	writer.Header().Set("Connection", "keep-alive")
+	writer.Header().Set("Access-Control-Allow-Origin", "*")
+	writer.Header().Set("Transfer-Encoding", "chunked")
+	writer.Header().Set("Access-Control-Allow-Headers", "Cache-Control")
+	writer.Header().Set("Access-Control-Allow-Credentials", "true")
+
+	var (
+		handler  = make(ContentEventHandler)
+		clientID = e.hub.Subscribe(handler)
+		buf      = new(bytes.Buffer)
+		enc      = json.NewEncoder(buf)
+	)
+
+	defer func() {
+		if err := e.hub.Unsubscribe(clientID); err != nil {
+			e.logger.Warnf("Error occurred while unsubscribing: %v", err)
+		}
+	}()
+
+	for {
+		select {
+		case ev := <-handler:
+			if err := enc.Encode(ev); err != nil {
+				e.logger.Errorf("Failed to marshal to JSON: %v", err)
+				continue
+			} else if _, err = fmt.Fprintf(writer, "data: %s\n\n", buf.String()); err != nil {
+				e.logger.Errorf("Failed to write to client: %v", err)
+				return
+			} else if f, ok := writer.(http.Flusher); !ok {
+				e.logger.Errorf("Cannot flush data")
+				writer.WriteHeader(http.StatusBadRequest)
+				return
+			} else {
+				f.Flush()
+			}
+		case <-req.Context().Done():
+			return
+		}
+	}
+}

api/no_cache_middleware.go

@@ -0,0 +1,12 @@
+package api
+
+import (
+	"net/http"
+)
+
+func NoCache(handler http.Handler) http.Handler {
+	return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		writer.Header().Set("Cache-Control", "no-cache")
+		handler.ServeHTTP(writer, request)
+	})
+}

api/reveal.go

@@ -0,0 +1,33 @@
+package api
+
+import (
+	"io"
+	"net/http"
+	"path"
+	"strings"
+	"time"
+
+	"code.icb4dc0.de/prskr/goveal/assets"
+	"code.icb4dc0.de/prskr/goveal/fs"
+	"code.icb4dc0.de/prskr/goveal/web"
+)
+
+func FileSystemMiddleware(fallthroughHandler http.Handler, wdfs fs.FS) http.Handler {
+	layers := []fs.FS{wdfs}
+	layers = append([]fs.FS{web.WebFS, assets.Assets}, layers...)
+
+	layeredFS := fs.Layered{Layers: layers}
+	return http.HandlerFunc(func(writer http.ResponseWriter, req *http.Request) {
+		reqPath := strings.TrimPrefix(req.URL.Path, "/")
+		if f, err := layeredFS.Open(reqPath); err != nil {
+			fallthroughHandler.ServeHTTP(writer, req)
+			return
+		} else if readSeeker, ok := f.(io.ReadSeeker); ok {
+			http.ServeContent(writer, req, path.Base(reqPath), time.Now(), readSeeker)
+			_ = f.Close()
+		} else {
+			_ = f.Close()
+			fallthroughHandler.ServeHTTP(writer, req)
+		}
+	})
+}

api/views.go

@@ -0,0 +1,103 @@
+package api
+
+import (
+	"encoding/hex"
+	"errors"
+	"hash/fnv"
+	"html/template"
+	"io"
+	"net/http"
+	"path"
+
+	"github.com/Masterminds/sprig/v3"
+	"github.com/julienschmidt/httprouter"
+	log "github.com/sirupsen/logrus"
+
+	"code.icb4dc0.de/prskr/goveal/config"
+	"code.icb4dc0.de/prskr/goveal/fs"
+	"code.icb4dc0.de/prskr/goveal/rendering"
+	"code.icb4dc0.de/prskr/goveal/web"
+)
+
+var indexTmpl *template.Template
+
+func init() {
+	if t, err := template.
+		New("index").
+		Funcs(sprig.FuncMap()).
+		Funcs(map[string]any{
+			"fileId": func(fileName string) string {
+				h := fnv.New32a()
+				return hex.EncodeToString(h.Sum([]byte(path.Base(fileName))))
+			},
+		}).
+		ParseFS(web.WebFS, "*.gohtml"); err != nil {
+		panic(err)
+	} else {
+		indexTmpl = t
+	}
+}
+
+type Views struct {
+	logger     *log.Logger
+	cfg        *config.Components
+	wdfs       fs.FS
+	mdFilepath string
+}
+
+func RegisterViews(router *httprouter.Router, logger *log.Logger, wdfs fs.FS, mdFilepath string, cfg *config.Components) {
+	p := &Views{
+		logger:     logger,
+		cfg:        cfg,
+		wdfs:       wdfs,
+		mdFilepath: mdFilepath,
+	}
+	router.GET("/", p.IndexPage)
+	router.GET("/index.html", p.IndexPage)
+	router.GET("/index.htm", p.IndexPage)
+	router.GET("/slides", p.RenderedMarkdown)
+}
+
+func (p *Views) IndexPage(writer http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
+	writer.Header().Set("Content-Type", "text/html")
+	if err := indexTmpl.ExecuteTemplate(writer, "index.gohtml", map[string]any{
+		"Reveal":    p.cfg.Reveal,
+		"Rendering": p.cfg.Rendering,
+	}); err != nil {
+		p.logger.Errorf("Failed to render template: %v", err)
+		writer.WriteHeader(http.StatusInternalServerError)
+		_, _ = writer.Write([]byte(err.Error()))
+	}
+}
+
+func (p *Views) RenderedMarkdown(writer http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
+	f, err := p.wdfs.Open(p.mdFilepath)
+	if err != nil {
+		writer.WriteHeader(http.StatusInternalServerError)
+		_, _ = writer.Write([]byte(err.Error()))
+		return
+	}
+
+	defer func() {
+		err = errors.Join(err, f.Close())
+	}()
+
+	data, err := io.ReadAll(f)
+	if err != nil {
+		writer.WriteHeader(http.StatusInternalServerError)
+		_, _ = writer.Write([]byte(err.Error()))
+		return
+	}
+
+	writer.Header().Set("Content-Type", "text/html")
+	var rendered []byte
+	if rendered, err = rendering.ToHTML(string(data), p.cfg.Rendering); err != nil {
+		writer.WriteHeader(http.StatusInternalServerError)
+		_, _ = writer.Write([]byte(err.Error()))
+		return
+	} else if _, err = writer.Write(rendered); err != nil {
+		writer.WriteHeader(http.StatusInternalServerError)
+		_, _ = writer.Write([]byte(err.Error()))
+		return
+	}
+}

assets/assets.go

@@ -0,0 +1,6 @@
+package assets
+
+import "embed"
+
+//go:embed reveal mermaid/mermaid.min.js
+var Assets embed.FS

assets/lint/config.toml

@@ -1,46 +0,0 @@
-ignoreGeneratedHeader = false
-severity = "warning"
-confidence = 0.8
-errorCode = 1
-warningCode = 1
-empty-block = true
-confusing-naming = true
-get-return = true
-deep-exit = true
-unused-parameter = true
-unreachable-code = true
-
-
-[rule.blank-imports]
-[rule.context-as-argument]
-[rule.context-keys-type]
-[rule.dot-imports]
-[rule.error-return]
-[rule.error-strings]
-[rule.error-naming]
-[rule.exported]
-[rule.if-return]
-[rule.increment-decrement]
-[rule.var-naming]
-[rule.var-declaration]
-[rule.package-comments]
-[rule.range]
-[rule.receiver-naming]
-[rule.time-naming]
-[rule.unexported-return]
-[rule.indent-error-flow]
-[rule.errorf]
-[rule.empty-block]
-[rule.superfluous-else]
-[rule.unused-parameter]
-[rule.unreachable-code]
-[rule.redefines-builtin-id]
-
-[argument-limit]
-  arguments =[4]
-
-[line-length-limit]
-  arguments =[80]
-
-[rule.add-constant]
-  arguments = [{maxLitCount = "3",allowStrs ="\"\"",allowInts="0,1,2",allowFloats="0.0,0.,1.0,1.,2.0,2."}]

assets/template/reveal-markdown.tmpl

@@ -6,52 +6,95 @@
 
     <title>goveal</title>
 
-    <link rel="stylesheet" href="/reveal/css/reveal.css">
-    <link rel="stylesheet" href="/reveal/css/theme/{{ .Reveal.Theme }}.css" id="theme">
+    <link rel="stylesheet" href="/dist/reveal.css">
+    <link rel="stylesheet" href="/dist/reset.css">
+    <link rel="stylesheet" href="/dist/theme/{{ .Reveal.Theme }}.css" id="theme">
 
-    <link rel="stylesheet" href="/reveal/lib/css/{{ .Reveal.CodeTheme }}.css">
+    <link rel="stylesheet" href="/plugin/highlight/{{ .Reveal.CodeTheme }}.css">
 </head>
 
 <body>
 
 <div class="reveal">
     <div class="slides">
-        <section data-markdown="/markdown/content.md"
-                 data-separator="^\n{{ .Reveal.HorizontalSeparator }}\n"
-                 data-separator-vertical="^\n{{ .Reveal.VerticalSeparator }}\n"
+        <section data-markdown="/content.md"
+                 data-separator="^{{ .Reveal.LineEnding.Escaped -}}{{ .Reveal.HorizontalSeparator }}{{- .Reveal.LineEnding.Escaped }}"
+                 data-separator-vertical="^{{ .Reveal.LineEnding.Escaped -}}{{ .Reveal.VerticalSeparator }}{{- .Reveal.LineEnding.Escaped }}"
                  data-separator-notes="^Note:"
                  data-charset="iso-8859-15">
         </section>
     </div>
 </div>
 
-<script src="/reveal/js/reveal.js"></script>
+<script src="/dist/reveal.js"></script>
+<script src="/plugin/markdown/markdown.js"></script>
+<script src="/plugin/highlight/highlight.js"></script>
+<script src="/plugin/notes/notes.js"></script>
+<script src="/plugin/menu/menu.js"></script>
+<script src="/js/reload.js"></script>
 
 <script>
+    Reveal.initialize({
+        controls: true,
+        progress: true,
+        history: true,
+        center: true,
+        slideNumber: true,
+        hash: true,
+        transition: '{{ .Reveal.Transition }}', // none/fade/slide/convex/concave/zoom
+        navigationMode: {{ .Reveal.NavigationMode | trim | quote }},
+        showSlideNumber: {{ .Reveal.SlideNumberVisibility | trim | quote }},
+        slideNumber: '{{ .Reveal.SlideNumberFormat }}',
+        markdown: {
+            smartypants: true,
+            smartLists: true
+        },
+        pdfSeparateFragments: false,
+        menu: {
+            numbers: true,
+            useTextContentForMissingTitles: true,
+            custom: [
+                {
+                    title: 'Print',
+                    icon: '<i class="fas fa-print"></i>',
+                    content: '<a href="/?print-pdf">Go to print view<a/>'
+                }
+            ],
+            themes: [
+                {name: 'Beige', theme: '/dist/theme/beige.css'},
+                {name: 'Black', theme: '/dist/theme/black.css'},
+                {name: 'Blood', theme: '/dist/theme/blood.css'},
+                {name: 'League', theme: '/dist/theme/league.css'},
+                {name: 'Moon', theme: '/dist/theme/moon.css'},
+                {name: 'Night', theme: '/dist/theme/night.css'},
+                {name: 'Serif', theme: '/dist/theme/serif.css'},
+                {name: 'Simple', theme: '/dist/theme/simple.css'},
+                {name: 'Sky', theme: '/dist/theme/sky.css'},
+                {name: 'Solarized', theme: '/dist/theme/solarized.css'},
+                {name: 'White', theme: '/dist/theme/white.css'}
+            ],
+            transitions: true,
+        },
+        plugins: [ RevealMarkdown, RevealHighlight, RevealNotes, RevealMenu ]
+    });
 
-			Reveal.initialize({
-				controls: true,
-				progress: true,
-				history: true,
-				center: true,
-                slideNumber: true,
-                hash: true,
-                transition: 'slide', // none/fade/slide/convex/concave/zoom
-                markdown:{
-                    smartypants: true,
-                    smartLists: true,
-                },
-
-				// Optional libraries used to extend on reveal.js
-				dependencies: [
-					{ src: '/reveal/plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
-                    { src: '/reveal/plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
-                    { src: '/reveal/plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
-					{ src: '/reveal/plugin/notes/notes.js' }
-				]
-			});
+    {{ if .Reveal.StyleSheets }}
+    {{ range $idx, $style := .Reveal.StyleSheets }}
+    var additionalStyleSheet = document.createElement('link');
+    additionalStyleSheet.rel = 'stylesheet';
+    additionalStyleSheet.type = 'text/css';
+    additionalStyleSheet.href = '/{{- $style }}';
+    document.getElementsByTagName('head')[0].appendChild(additionalStyleSheet);
+    {{ end }}
+    {{ end }}
 
+    {{ if .Reveal.FilesToMonitor }}
+    {{ range $idx, $file := .Reveal.FilesToMonitor }}
+    subscribeForUpdates("/{{ $file }}")
+    {{ end }}
+    {{ end }}
 
+    subscribeForUpdates("/content.md")
 
 </script>
 

cmd/goveal/main.go

@@ -14,8 +14,12 @@
 
 package main
 
-import "github.com/baez90/go-reveal-slides/internal/app/cmd"
+import (
+	log "github.com/sirupsen/logrus"
+)
 
 func main() {
-	cmd.Execute()
+	if err := rootCmd.Execute(); err != nil {
+		log.Errorf("Failed to run command: %v", err)
+	}
 }

cmd/goveal/root.go

@@ -0,0 +1,52 @@
+// Copyright © 2019 Peter Kurfer
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"os"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+
+	"code.icb4dc0.de/prskr/goveal/config"
+)
+
+//nolint:lll // explanations are rather long
+var (
+	cfgFile string
+	rootCmd = &cobra.Command{
+		Use:   "goveal",
+		Short: "goveal is a small reveal.js server",
+		Long: `goveal is a single static binary to host your reveal.js based markdown presentation.
+It is running a small web server that loads your markdown file, renders a complete HTML page and delivers it including all the reveal.js assets.
+It is not required to restart the server when you edit the markdown - a simple reload of the page is doing all the required magic.`,
+		PersistentPreRunE: func(*cobra.Command, []string) (err error) {
+			log.SetFormatter(&log.TextFormatter{
+				ForceColors: true,
+			})
+
+			if workingDir, err = os.Getwd(); err != nil {
+				return err
+			}
+
+			cfg, err = config.Load(workingDir, cfgFile)
+			return err
+		},
+	}
+)
+
+func init() {
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.go-reveal-slides.yaml)")
+}

cmd/goveal/serve.go

@@ -0,0 +1,110 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"hash/fnv"
+	"net/http"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+
+	"github.com/julienschmidt/httprouter"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+
+	"code.icb4dc0.de/prskr/goveal/api"
+	"code.icb4dc0.de/prskr/goveal/config"
+	"code.icb4dc0.de/prskr/goveal/events"
+	"code.icb4dc0.de/prskr/goveal/fs"
+)
+
+const (
+	defaultListeningPort uint16 = 2233
+	defaultHost                 = "127.0.0.1"
+)
+
+var (
+	workingDir  string
+	cfg         *config.Components
+	host        string
+	port        uint16
+	openBrowser bool
+	serveCmd    = &cobra.Command{
+		Use:  "serve",
+		Args: cobra.ExactArgs(1),
+		RunE: func(_ *cobra.Command, args []string) (err error) {
+			var wdfs *fs.Watching
+
+			if wdfs, err = fs.NewWatching(fs.Dir(workingDir)); err != nil {
+				return err
+			}
+
+			defer func() {
+				err = errors.Join(err, wdfs.Close())
+			}()
+
+			var mdFile fs.File
+			if mdFile, err = wdfs.Open(args[0]); err != nil {
+				return err
+			}
+			_ = mdFile.Close()
+
+			router := httprouter.New()
+
+			hub := events.NewEventHub(
+				log.StandardLogger(),
+				wdfs,
+				fnv.New32a(),
+				events.MutationReloadForFile(args[0]),
+				events.MutationConfigReloadForFile(filepath.Base(cfg.ConfigFileInUse)),
+			)
+
+			api.RegisterViews(router, log.StandardLogger(), wdfs, args[0], cfg)
+			api.RegisterEventsAPI(router, hub, log.StandardLogger())
+			api.RegisterConfigAPI(router, cfg)
+
+			handler := api.FileSystemMiddleware(router, wdfs)
+			handler = api.NoCache(handler)
+
+			if openBrowser {
+				log.Info("Opening browser...")
+				openBrowserInBackground(fmt.Sprintf("http://%s:%d", host, port))
+			}
+
+			log.Infof("Listening on %s:%d", host, port)
+			if err := http.ListenAndServe(fmt.Sprintf("%s:%d", host, port), handler); err != nil {
+				if errors.Is(err, http.ErrServerClosed) {
+					return nil
+				}
+				return err
+			}
+			return nil
+		},
+	}
+)
+
+func init() {
+	serveCmd.Flags().Uint16Var(&port, "port", defaultListeningPort, "port to listen on")
+	serveCmd.Flags().StringVar(&host, "host", defaultHost, "address/hostname to bind on")
+	serveCmd.Flags().BoolVar(&openBrowser, "open-browser", true, "Open browser when starting")
+	rootCmd.AddCommand(serveCmd)
+}
+
+func openBrowserInBackground(url string) {
+	var err error
+
+	switch runtime.GOOS {
+	case "linux":
+		err = exec.Command("xdg-open", url).Start()
+	case "windows":
+		err = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
+	case "darwin":
+		err = exec.Command("open", url).Start()
+	default:
+		err = fmt.Errorf("unsupported platform")
+	}
+	if err != nil {
+		log.Warn(err)
+	}
+}

config/components.go

@@ -0,0 +1,85 @@
+package config
+
+const (
+	defaultWidth  uint = 960
+	defaultHeight uint = 700
+)
+
+var defaults = map[string]any{
+	"mermaid.theme":                       "forest",
+	"theme":                               "beige",
+	"width":                               defaultWidth,
+	"height":                              defaultHeight,
+	"codeTheme":                           "monokai",
+	"verticalSeparator":                   `\*\*\*`,
+	"horizontalSeparator":                 `---`,
+	"transition":                          TransitionNone,
+	"controlsLayout":                      ControlsLayoutEdges,
+	"controls":                            true,
+	"progress":                            true,
+	"history":                             true,
+	"center":                              true,
+	"slideNumber":                         true,
+	"menu.numbers":                        true,
+	"menu.useTextContentForMissingTitles": true,
+	"menu.transitions":                    true,
+	"menu.hideMissingTitles":              true,
+	"menu.markers":                        true,
+	"menu.openButton":                     true,
+}
+
+const (
+	TransitionNone    Transition = "none"
+	TransitionFade    Transition = "fade"
+	TransitionSlide   Transition = "slide"
+	TransitionConvex  Transition = "convex"
+	TransitionConcave Transition = "concave"
+	TransitionZoom    Transition = "zoom"
+
+	ControlsLayoutBottomRight ControlsLayout = "bottom-right"
+	ControlsLayoutEdges       ControlsLayout = "edges"
+)
+
+type (
+	Transition     string
+	ControlsLayout string
+	Mermaid        struct {
+		Theme string `json:"theme"`
+	}
+	Rendering struct {
+		VerticalSeparator   string
+		HorizontalSeparator string
+		Stylesheets         []string
+	}
+	Reveal struct {
+		Theme          string         `json:"theme"`
+		CodeTheme      string         `json:"codeTheme"`
+		Transition     Transition     `json:"transition"`
+		Controls       bool           `json:"controls"`
+		ControlsLayout ControlsLayout `json:"controlsLayout"`
+		Progress       bool           `json:"progress"`
+		History        bool           `json:"history"`
+		Center         bool           `json:"center"`
+		SlideNumber    bool           `json:"slideNumber"`
+		Width          uint           `json:"width"`
+		Height         uint           `json:"height"`
+		Menu           struct {
+			Numbers                        bool `json:"numbers"`
+			UseTextContentForMissingTitles bool `json:"useTextContentForMissingTitles"`
+			Transitions                    bool `json:"transitions"`
+			HideMissingTitles              bool `json:"hideMissingTitles"`
+			Markers                        bool `json:"markers"`
+			OpenButton                     bool `json:"openButton"`
+		} `json:"menu"`
+	}
+	Components struct {
+		ConfigFileInUse string    `mapstructure:"-"`
+		Reveal          Reveal    `mapstructure:",squash"`
+		Rendering       Rendering `mapstructure:",squash"`
+		Mermaid         Mermaid
+	}
+)
+
+func (t Transition) String() string {
+	return string(t)
+}

config/load.go

@@ -0,0 +1,51 @@
+package config
+
+import (
+	"github.com/fsnotify/fsnotify"
+	"github.com/mitchellh/go-homedir"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
+)
+
+func Load(workingDir, configFile string) (cfg *Components, err error) {
+	var (
+		loader = viper.New()
+		home   string
+	)
+	cfg = new(Components)
+
+	for k, v := range defaults {
+		loader.SetDefault(k, v)
+	}
+
+	if configFile != "" {
+		loader.SetConfigFile(configFile)
+	} else if home, err = homedir.Dir(); err != nil {
+		return nil, err
+	} else {
+		loader.AddConfigPath(home)
+		loader.AddConfigPath(workingDir)
+		loader.SetConfigName("goveal")
+		loader.SetConfigType("yaml")
+	}
+
+	loader.AutomaticEnv()
+
+	if err = loader.ReadInConfig(); err == nil {
+		log.Info("Using config file:", loader.ConfigFileUsed())
+		cfg.ConfigFileInUse = loader.ConfigFileUsed()
+		loader.WatchConfig()
+	} else {
+		return nil, err
+	}
+
+	loader.OnConfigChange(func(in fsnotify.Event) {
+		if in.Op == fsnotify.Write {
+			_ = loader.Unmarshal(cfg)
+		}
+	})
+
+	err = loader.Unmarshal(cfg)
+
+	return cfg, err
+}

download_revealjs.sh

@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-mkdir -p ./assets/reveal
-curl -sL "https://github.com/hakimel/reveal.js/archive/${1:-3.8.0}.tar.gz" | tar -xvz --strip-components=1 -C ./assets/reveal --wildcards *.js --wildcards *.css --exclude test --exclude gruntfile.js

events/event_hub.go

@@ -0,0 +1,156 @@
+package events
+
+import (
+	"encoding/hex"
+	"fmt"
+	"hash"
+	"io"
+	"path"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+
+	"github.com/google/uuid"
+	log "github.com/sirupsen/logrus"
+
+	"code.icb4dc0.de/prskr/goveal/fs"
+)
+
+const (
+	baseDecimal = 10
+)
+
+type (
+	EventMutation interface {
+		OnEvent(in ContentEvent, ev fs.Event) (out ContentEvent)
+	}
+	ContentEvent struct {
+		File         string `json:"file"`
+		FileNameHash string `json:"fileNameHash"`
+		Timestamp    string `json:"ts"`
+		ForceReload  bool   `json:"forceReload"`
+		ReloadConfig bool   `json:"reloadConfig"`
+	}
+	EventSource interface {
+		io.Closer
+		fs.FS
+		Events() chan fs.Event
+	}
+	EventHandler interface {
+		OnEvent(ev ContentEvent) error
+		Close() error
+	}
+	EventHandlerFunc            func(ev ContentEvent) error
+	MutationReloadForFile       string
+	MutationConfigReloadForFile string
+)
+
+func (t MutationReloadForFile) OnEvent(in ContentEvent, ev fs.Event) (out ContentEvent) {
+	if strings.EqualFold(filepath.Base(ev.File), filepath.Base(string(t))) {
+		in.ForceReload = true
+	}
+	return in
+}
+
+func (t MutationConfigReloadForFile) OnEvent(in ContentEvent, ev fs.Event) (out ContentEvent) {
+	if strings.EqualFold(filepath.Base(ev.File), string(t)) {
+		in.ReloadConfig = true
+	}
+	return in
+}
+
+func (f EventHandlerFunc) OnEvent(ev ContentEvent) error {
+	return f(ev)
+}
+
+func NewEventHub(logger *log.Logger, eventSource EventSource, fileNameHash hash.Hash, mutations ...EventMutation) *EventHub {
+	hub := &EventHub{
+		Logger:        logger,
+		FileNameHash:  fileNameHash,
+		mutations:     mutations,
+		source:        eventSource,
+		subscriptions: make(map[uuid.UUID]EventHandler),
+		done:          make(chan struct{}),
+	}
+
+	go hub.processEvents()
+
+	return hub
+}
+
+type EventHub struct {
+	FileNameHash  hash.Hash
+	Logger        *log.Logger
+	mutations     []EventMutation
+	lock          sync.RWMutex
+	done          chan struct{}
+	source        EventSource
+	subscriptions map[uuid.UUID]EventHandler
+}
+
+func (h *EventHub) Subscribe(handler EventHandler) (id uuid.UUID) {
+	h.lock.Lock()
+	defer h.lock.Unlock()
+
+	clientID := uuid.New()
+	h.subscriptions[clientID] = handler
+
+	return clientID
+}
+
+func (h *EventHub) Unsubscribe(id uuid.UUID) (err error) {
+	h.lock.Lock()
+	defer h.lock.Unlock()
+
+	if handler, ok := h.subscriptions[id]; ok {
+		err = handler.Close()
+		delete(h.subscriptions, id)
+		return err
+	}
+
+	return nil
+}
+
+func (h *EventHub) Close() error {
+	close(h.done)
+	return h.source.Close()
+}
+
+func (h *EventHub) processEvents() {
+	events := h.source.Events()
+	for {
+		select {
+		case ev, more := <-events:
+			if !more {
+				return
+			}
+			h.notifySubscribers(ev)
+		case _, more := <-h.done:
+			if !more {
+				return
+			}
+		}
+	}
+}
+
+func (h *EventHub) notifySubscribers(ev fs.Event) {
+	h.lock.RLock()
+	defer h.lock.RUnlock()
+
+	ce := ContentEvent{
+		File:         fmt.Sprintf("/%s", ev.File),
+		Timestamp:    strconv.FormatInt(ev.Timestamp.Unix(), baseDecimal),
+		FileNameHash: hex.EncodeToString(h.FileNameHash.Sum([]byte(path.Base(ev.File)))),
+	}
+
+	for idx := range h.mutations {
+		ce = h.mutations[idx].OnEvent(ce, ev)
+	}
+
+	for _, handler := range h.subscriptions {
+		if err := handler.OnEvent(ce); err != nil {
+			h.Logger.Errorf("Failed to propagate event: %v", err)
+		}
+	}
+}

examples/custom.css

@@ -0,0 +1,7 @@
+.reveal h1 {
+    color: yellow;
+}
+
+p {
+    color: green;
+}

examples/goveal.yaml

@@ -1,4 +1,22 @@
 theme: night
-code-theme: monokai
-horizontal-separator: ===
-vertical-separator: ---
+codeTheme: monokai
+horizontalSeparator: ---
+verticalSeparator: '\*\*\*'
+transition: convex
+controlsLayout: edges
+controls: true
+progress: true
+history: true
+center: true
+slideNumber: true
+menu:
+  numbers: false
+  useTextContentForMissingTitles: true
+  transitions: true
+  hideMissingTitles: false
+  markers: true
+  openButton: true
+mermaid:
+  theme: forest
+stylesheets:
+  - custom.css

examples/slides.md

@@ -4,46 +4,106 @@
 
 Content 1.1
 
-Note: This will only appear in the speaker notes window.
-
----
+***
 
 ## External 1.2
 
 Content 1.2
 
-===
+Note:
+
+This will only display in the notes window.
+
+***
+
+### List & fragments
+
+* unordered <!-- .element: class="fragment" -->
+* list <!-- .element: class="fragment" -->
+* with `code`  <!-- .element: class="fragment" -->
+* with __bold__ text <!-- .element: class="fragment" -->
+
+Notes:
+
+- some other points only
+- in the nodes
+
+***
+
+### List in HTML
+
+<ul>
+<li>List</li>
+<li class="fragment">with <code>code</code></li>
+<li class="fragment">with <strong>bold</strong> text</li>
+</ul>
+
+---
 
 ## External 2
 
 Content 2.1
 
-===
+---
 
 ## External 3.1
 
 Content 3.1
 
----
+***
 
 ## External 3.2
 
 Content 3.2
 
----
+***
 
 ## External 3.3
 
 ![External Image](https://s3.amazonaws.com/static.slid.es/logo/v2/slides-symbol-512x512.png)
 
-===
+---
+<!-- .slide data-menu-title="Abla Habla" -->
 
 ## External 4.1
 
-![Local image](/local/examples/gopher.jpg)
+![Local image](/gopher.jpg) <!-- .element: class="r-stretch" -->
 
----
+***
 
 ## External 4.2
 
-<a href="https://www.google.com">Google</a>
+<a href="https://www.google.com">Google</a>
+
+---
+
+## Code
+
+```csharp
+var i = 10;
+for (var j = 0; j < i; j++) {
+    Console.WriteLine($"{j}");
+}
+```
+
+***
+
+### Mermaid
+
+```mermaid
+%%{init: {'theme': 'neutral'}}%%
+flowchart LR
+   a --> b & c--> d
+```
+
+***
+
+### The inadequacy of a non-highlighted being
+
+{line-numbers="1-2|3|4"}
+```js
+let a = 1;
+let b = 2;
+let c = x => 1 + 2 + x;
+c(3);
+```

fs/layered.go

@@ -0,0 +1,26 @@
+package fs
+
+import (
+	"io/fs"
+	"os"
+)
+
+type (
+	FS   = fs.FS
+	File = fs.File
+)
+
+var Dir = os.DirFS
+
+type Layered struct {
+	Layers []FS
+}
+
+func (l Layered) Open(name string) (file fs.File, err error) {
+	for idx := range l.Layers {
+		if file, err = l.Layers[idx].Open(name); err == nil {
+			return file, nil
+		}
+	}
+	return nil, err
+}

fs/watching_fs.go

@@ -0,0 +1,66 @@
+package fs
+
+import (
+	"io/fs"
+	"path/filepath"
+	"time"
+
+	"github.com/fsnotify/fsnotify"
+	log "github.com/sirupsen/logrus"
+)
+
+type Event struct {
+	File      string
+	Timestamp time.Time
+}
+
+func NewWatching(backing FS) (*Watching, error) {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		return nil, err
+	}
+	return &Watching{
+		watcher: watcher,
+		backing: backing,
+	}, nil
+}
+
+type Watching struct {
+	events  chan Event
+	watcher *fsnotify.Watcher
+	backing FS
+}
+
+func (w *Watching) Open(name string) (file fs.File, err error) {
+	file, err = w.backing.Open(name)
+	if err == nil {
+		dir := filepath.Dir(name)
+		if watchErr := w.watcher.Add(dir); watchErr != nil {
+			log.Errorf("Failed to watch %s: %v", dir, watchErr)
+		}
+		return file, nil
+	}
+	return nil, err
+}
+
+func (w *Watching) Events() chan Event {
+	if w.events == nil {
+		w.events = make(chan Event)
+		go transportEvents(w.watcher.Events, w.events)
+	}
+	return w.events
+}
+
+func (w *Watching) Close() error {
+	return w.watcher.Close()
+}
+
+func transportEvents(in <-chan fsnotify.Event, out chan<- Event) {
+	for ev := range in {
+		ev.Name = filepath.Base(ev.Name)
+		out <- Event{
+			File:      ev.Name,
+			Timestamp: time.Now(),
+		}
+	}
+}

go.mod

@@ -1,22 +1,49 @@
-module github.com/baez90/go-reveal-slides
+module code.icb4dc0.de/prskr/goveal
 
-go 1.12
+go 1.20
 
 require (
-	github.com/fsnotify/fsnotify v1.4.7
-	github.com/gobuffalo/flect v0.1.3 // indirect
-	github.com/gobuffalo/packr/v2 v2.2.0
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
-	github.com/kr/pty v1.1.4 // indirect
+	github.com/Masterminds/sprig/v3 v3.2.3
+	github.com/fsnotify/fsnotify v1.7.0
+	github.com/gomarkdown/markdown v0.0.0-20231115200524-a660076da3fd
+	github.com/google/uuid v1.4.0
+	github.com/julienschmidt/httprouter v1.3.0
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/sirupsen/logrus v1.4.1
-	github.com/spf13/cobra v0.0.3
-	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.3.2
-	github.com/stretchr/objx v0.2.0 // indirect
-	golang.org/x/crypto v0.0.0-20190418165655-df01cb2cc480 // indirect
-	golang.org/x/net v0.0.0-20190419010253-1f3472d942ba // indirect
-	golang.org/x/sys v0.0.0-20190419153524-e8e3143a4f4a // indirect
-	golang.org/x/tools v0.0.0-20190420000508-685fecacd0a0 // indirect
+	github.com/sirupsen/logrus v1.9.3
+	github.com/spf13/cobra v1.8.0
+	github.com/spf13/viper v1.17.0
+	github.com/valyala/bytebufferpool v1.0.0
+)
+
+require (
+	github.com/Masterminds/goutils v1.1.1 // indirect
+	github.com/Masterminds/semver/v3 v3.2.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/huandu/xstrings v1.3.3 // indirect
+	github.com/imdario/mergo v0.3.13 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
+	github.com/pelletier/go-toml/v2 v2.1.0 // indirect
+	github.com/sagikazarmark/locafero v0.3.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/shopspring/decimal v1.3.1 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.10.0 // indirect
+	github.com/spf13/cast v1.5.1 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/crypto v0.13.0 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/sys v0.12.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,125 +1,611 @@
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
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internal/app/cmd/root.go

@@ -1,120 +0,0 @@
-// Copyright © 2019 Peter Kurfer
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package cmd
-
-import (
-	"fmt"
-	"github.com/baez90/go-reveal-slides/internal/app/config"
-	"github.com/fsnotify/fsnotify"
-	"os"
-
-	"github.com/mitchellh/go-homedir"
-	log "github.com/sirupsen/logrus"
-	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
-)
-
-const (
-	defaultTheme string = "white"
-)
-
-var (
-	cfgFile             string
-	theme               string
-	codeTheme           string
-	horizontalSeparator string
-	verticalSeparator   string
-	rootCmd             = &cobra.Command{
-		Use:   "goveal",
-		Short: "goveal is a small reveal.js server",
-		Long: `goveal is a single static binary to host your reveal.js based markdown presentation.
-It is running a small web server that loads your markdown file, renders a complete HTML page and delivers it including all the reveal.js assets.
-It is not required to restart the server when you edit the markdown - a simple reload of the page is doing all the required magic.`,
-	}
-	params config.RevealParams
-)
-
-// Execute adds all child commands to the root command and sets flags appropriately.
-// This is called by main.main(). It only needs to happen once to the rootCmd.
-func Execute() {
-	if err := rootCmd.Execute(); err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-}
-
-func init() {
-	cobra.OnInitialize(initConfig)
-	cobra.OnInitialize(initLogging)
-
-	rootCmd.PersistentFlags().StringVar(&theme, "theme", defaultTheme, "reveal.js theme to use")
-	rootCmd.PersistentFlags().StringVar(&codeTheme, "code-theme", "monokai", "name of the code theme to use for highlighting")
-	rootCmd.PersistentFlags().StringVar(&horizontalSeparator, "horizontal-separator", "===", "horizontal separator in slides")
-	rootCmd.PersistentFlags().StringVar(&verticalSeparator, "vertical-separator", "---", "vertical separator in slides")
-	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.go-reveal-slides.yaml)")
-
-}
-
-func initLogging() {
-	log.SetFormatter(&log.TextFormatter{
-		ForceColors: true,
-	})
-}
-
-// initConfig reads in config file and ENV variables if set.
-func initConfig() {
-	if cfgFile != "" {
-		// Use config file from the flag.
-		viper.SetConfigFile(cfgFile)
-	} else {
-		// Find home directory.
-		home, err := homedir.Dir()
-		if err != nil {
-			log.Infof("Failed to determine home directory: %v", err)
-		} else {
-			viper.AddConfigPath(home)
-		}
-
-		cwd, err := os.Getwd()
-		if err != nil {
-			log.Infof("Failed to determine current working directory: %v", err)
-		} else {
-			viper.AddConfigPath(cwd)
-		}
-
-		viper.SetConfigName("goveal")
-	}
-
-	viper.AutomaticEnv() // read in environment variables that match
-
-	// If a config file is found, read it in.
-	if err := viper.ReadInConfig(); err == nil {
-		log.Info("Using config file:", viper.ConfigFileUsed())
-
-		log.Info("Starting to watch config file...")
-		viper.WatchConfig()
-		viper.OnConfigChange(func(in fsnotify.Event) {
-			log.Info("Noticed configuration change...")
-			params.Load()
-		})
-	}
-
-	if err := viper.BindPFlags(rootCmd.PersistentFlags()); err != nil {
-		log.Errorf("Failed to bind flags to viper")
-	}
-
-	params.Load()
-
-}

internal/app/cmd/serve.go

@@ -1,83 +0,0 @@
-// Copyright © 2019 Peter Kurfer peter.kurfer@googlemail.com
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package cmd
-
-import (
-	"fmt"
-	"github.com/baez90/go-reveal-slides/internal/app/rendering"
-	"github.com/gobuffalo/packr/v2"
-	"github.com/spf13/cobra"
-	"net/http"
-	"os"
-
-	log "github.com/sirupsen/logrus"
-)
-
-var (
-	host     string
-	port     uint16
-	serveCmd = &cobra.Command{
-		Use:   "serve",
-		Args:  cobra.ExactArgs(1),
-		Short: "",
-		Long:  ``,
-		Run: func(cmd *cobra.Command, args []string) {
-
-			tmplRenderer, err := rendering.NewRevealRenderer(&params)
-
-			if err != nil {
-				log.Errorf("Failed to initialize reveal renderer due to error: %v", err)
-				os.Exit(1)
-			}
-
-			markdownHandler, err := rendering.NewMarkdownHandler(args[0])
-			if err != nil {
-				log.Errorf("Failed to initialize reveal renderer due to error: %v", err)
-				os.Exit(1)
-			}
-
-			// Packr2 handler to serve Reveal.js assets
-			log.Info("Setup reveal assets under route /reveal/ route...")
-			revealBox := packr.New("reveal-assets", "./../../../assets/reveal")
-			http.Handle("/reveal/", http.StripPrefix("/reveal/", http.FileServer(revealBox)))
-
-			// Static file handler under subroute to serve static files e.g. images
-			log.Info("Setup static file serving under /local/ route...")
-			fs := http.FileServer(http.Dir("."))
-			http.Handle("/local/", http.StripPrefix("/local/", fs))
-
-			// single file handler that only delivers the single Markdown file containing the slides
-			log.Info("Setup markdown handler under /markdown/content.md route...")
-			http.Handle("/markdown/", markdownHandler)
-
-			// entrypoint that delivers the rendered reveal.js index HTML page
-			http.Handle("/", tmplRenderer)
-
-			// start HTTP server
-			hostPort := fmt.Sprintf("%s:%d", host, port)
-			log.Infof("Running at addr http://%s/", hostPort)
-			if err := http.ListenAndServe(hostPort, nil); err != nil {
-				log.Error("Error while running serve command: %v", err)
-			}
-		},
-	}
-)
-
-func init() {
-	rootCmd.AddCommand(serveCmd)
-
-	serveCmd.Flags().StringVar(&host, "host", "localhost", "host the CLI should listen on")
-	serveCmd.Flags().Uint16Var(&port, "port", 2233, "port the CLI should listen on")
-}

internal/app/config/reveal_params.go

@@ -1,31 +0,0 @@
-// Copyright © 2019 Peter Kurfer peter.kurfer@googlemail.com
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package config
-
-import "github.com/spf13/viper"
-
-type RevealParams struct {
-	Theme               string
-	CodeTheme           string
-	HorizontalSeparator string
-	VerticalSeparator   string
-}
-
-func (params *RevealParams) Load() {
-	params.Theme = viper.GetString("theme")
-	params.CodeTheme = viper.GetString("code-theme")
-	params.HorizontalSeparator = viper.GetString("horizontal-separator")
-	params.VerticalSeparator = viper.GetString("vertical-separator")
-}

internal/app/rendering/markdown.go

@@ -1,52 +0,0 @@
-// Copyright © 2019 Peter Kurfer peter.kurfer@googlemail.com
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package rendering
-
-import (
-	"fmt"
-	"net/http"
-	"os"
-	"path"
-)
-
-type MarkdownHandler interface {
-	http.Handler
-}
-
-func NewMarkdownHandler(markdownPath string) (handler MarkdownHandler, err error) {
-	var info os.FileInfo
-	info, err = os.Stat(markdownPath)
-	if err != nil {
-		return
-	}
-
-	if info.IsDir() || path.Ext(info.Name()) != ".md" {
-		err = fmt.Errorf("path %s did not pass sanity checks for markdown files", markdownPath)
-		return
-	}
-
-	handler = &markdownHandler{
-		markdownPath: markdownPath,
-	}
-	return
-}
-
-type markdownHandler struct {
-	markdownPath string
-}
-
-func (handler *markdownHandler) ServeHTTP(response http.ResponseWriter, request *http.Request) {
-	http.ServeFile(response, request, handler.markdownPath)
-}

internal/app/rendering/template.go

@@ -1,77 +0,0 @@
-// Copyright © 2019 Peter Kurfer peter.kurfer@googlemail.com
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package rendering
-
-import (
-	"github.com/baez90/go-reveal-slides/internal/app/config"
-	"github.com/gobuffalo/packr/v2"
-	log "github.com/sirupsen/logrus"
-	"html/template"
-	"net/http"
-)
-
-type RevealRenderer interface {
-	http.Handler
-	init() error
-}
-
-func NewRevealRenderer(params *config.RevealParams) (renderer RevealRenderer, err error) {
-	renderer = &revealRenderer{
-		params: params,
-	}
-	err = renderer.init()
-
-	return
-}
-
-type revealRenderer struct {
-	template         *template.Template
-	renderedTemplate string
-	params           *config.RevealParams
-}
-
-func (renderer *revealRenderer) init() (err error) {
-	templateBox := packr.New("rendering", "./../../../assets/template")
-	templateString, err := templateBox.FindString("reveal-markdown.tmpl")
-	if err != nil {
-		return
-	}
-
-	renderer.template, err = template.New("index").Parse(templateString)
-	return
-}
-
-func (renderer *revealRenderer) ServeHTTP(response http.ResponseWriter, request *http.Request) {
-
-	if renderer.template == nil {
-		writeErrorResponse(500, "rendering is not set - probably error during startup", response)
-		return
-	}
-
-	err := renderer.template.Execute(response, struct {
-		Reveal config.RevealParams
-	}{Reveal: *renderer.params})
-
-	if err != nil {
-		writeErrorResponse(500, "Failed to render Markdown to rendering", response)
-		log.Errorf("Failed to render Markdown rendering: %v", err)
-	}
-}
-
-func writeErrorResponse(code int, msg string, response http.ResponseWriter) {
-	response.WriteHeader(code)
-	_, err := response.Write([]byte(msg))
-	log.Errorf("Failed to write error reponse: %v", err)
-}

packr2_hack.go

@@ -1,20 +0,0 @@
-// Copyright © 2019 Peter Kurfer peter.kurfer@googlemail.com
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package go_reveal_slides
-
-import (
-	_ "github.com/baez90/go-reveal-slides/internal/app/cmd"
-	_ "github.com/baez90/go-reveal-slides/internal/app/rendering"
-)

rendering/emoji/emoji.go

@@ -0,0 +1,32 @@
+package emoji
+
+import (
+	_ "embed"
+	"encoding/json"
+)
+
+func isValidEmoji(input []byte) bool {
+	_, exists := emojiMap[string(input)]
+	return exists
+}
+
+var (
+	//go:embed emoji.json
+	emojiMapRaw []byte
+
+	emojiMap map[string]string
+)
+
+func init() {
+	rawMap := make(map[string][]string)
+	if err := json.Unmarshal(emojiMapRaw, &rawMap); err != nil {
+		panic(err)
+	}
+
+	emojiMap = make(map[string]string, len(rawMap))
+	for emoji, keywords := range rawMap {
+		for i := range keywords {
+			emojiMap[keywords[i]] = emoji
+		}
+	}
+}

rendering/emoji/emoji_parser.go

@@ -0,0 +1,109 @@
+package emoji
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+
+	"github.com/gomarkdown/markdown/ast"
+)
+
+func NewEmojiParser() *EmojiParser {
+	return &EmojiParser{
+		seen: make(map[string]bool),
+	}
+}
+
+// Node is a node containing an emoji
+type Node struct {
+	ast.Leaf
+}
+
+type EmojiParser struct {
+	seen map[string]bool
+}
+
+func (p *EmojiParser) EmojiParser(data []byte) (parsedNode ast.Node, result []byte, newLength int) {
+	if p.seen[string(data)] {
+		// Already processed
+		return nil, nil, 0
+	}
+	if bytes.Contains(data, []byte("class=\"emoji\"")) {
+		// Already processed
+		return nil, nil, 0
+	}
+	dataLen := len(data)
+	if dataLen <= 1 {
+		// Not long enough to be an emoji
+		return nil, nil, 0
+	}
+	if bytes.IndexByte(data, ':') == -1 {
+		// No emoji delimiters
+		return nil, nil, 0
+	}
+	// Translate emojis to HTML
+	resData := make([]byte, 0)
+	startIndex := bytes.IndexByte(data, ':')
+	resData = append(resData, data[0:startIndex]...)
+	for {
+		if startIndex >= len(data) {
+			// Done
+			break
+		}
+		endIndex := bytes.IndexByte(data[startIndex+1:], ':') + startIndex + 1
+		if endIndex > startIndex {
+			name := string(data[startIndex+1 : endIndex])
+			if isValidEmoji([]byte(name)) {
+				startIndex = endIndex + 1
+				url := fmt.Sprintf(`<img class="emoji" src=%q alt=":%s:"></img>`, GenerateEmojiURL(name), name)
+				resData = append(resData, []byte(url)...)
+			} else {
+				resData = append(resData, data[startIndex:endIndex]...)
+				startIndex = endIndex
+			}
+			if startIndex == dataLen {
+				break
+			}
+		} else {
+			break
+		}
+	}
+	if startIndex < dataLen {
+		resData = append(resData, data[startIndex:]...)
+	}
+
+	if !bytes.Contains(resData, []byte("class=\"emoji\"")) {
+		// Processed with no changes
+		p.seen[string(resData)] = true
+	}
+
+	return &ast.Softbreak{}, resData, dataLen
+}
+
+func GenerateEmojiURL(emoji string) string {
+	code, exists := emojiMap[emoji]
+	if !exists {
+		return ""
+	}
+	res := ""
+	chars := utf8.RuneCountInString(code)
+	curChar := 1
+	for _, c := range code {
+		tmp := strings.Trim(strings.ToLower(strconv.QuoteRuneToASCII(c)), "'")
+		if tmp != `\ufe0f` || (chars > 2 && curChar == chars) {
+			// Valid character to add
+			if curChar > 1 {
+				res += "-"
+			}
+			if len(tmp) == 1 {
+				res += fmt.Sprintf("%x", []byte(tmp))
+			} else {
+				res += strings.TrimLeft(tmp[2:], "0")
+			}
+		}
+		curChar++
+	}
+	return fmt.Sprintf("https://twemoji.maxcdn.com/2/svg/%s.svg", res)
+}

rendering/html.go

@@ -0,0 +1,90 @@
+package rendering
+
+import (
+	"fmt"
+	"html/template"
+	"regexp"
+
+	"github.com/gomarkdown/markdown/parser"
+	"github.com/valyala/bytebufferpool"
+
+	"code.icb4dc0.de/prskr/goveal/config"
+)
+
+const (
+	parserExtensions = parser.NoIntraEmphasis | parser.Tables | parser.FencedCode |
+		parser.Autolink | parser.Strikethrough | parser.SpaceHeadings | parser.HeadingIDs |
+		parser.BackslashLineBreak | parser.DefinitionLists | parser.MathJax | parser.Titleblock |
+		parser.OrderedListStart | parser.Attributes
+)
+
+func ToHTML(markdown string, renderCfg config.Rendering) (rendered []byte, err error) {
+	var slides []rawSlide
+	if slides, err = splitIntoRawSlides(markdown, renderCfg); err != nil {
+		return nil, err
+	}
+
+	buf := bytebufferpool.Get()
+	defer func() {
+		buf.Reset()
+		bytebufferpool.Put(buf)
+	}()
+
+	for idx := range slides {
+		if rendered, err := slides[idx].ToHTML(); err != nil {
+			return nil, err
+		} else {
+			_, _ = buf.WriteString(string(rendered))
+		}
+	}
+
+	return buf.Bytes(), nil
+}
+
+type rawSlide struct {
+	Content  string
+	Children []rawSlide
+}
+
+func (s rawSlide) HasNotes() bool {
+	return notesLineRegexp.MatchString(s.Content)
+}
+
+func (s rawSlide) ToHTML() (template.HTML, error) {
+	if rendered, err := renderTemplate("slide.gohtml", s); err != nil {
+		return "", err
+	} else {
+		//nolint:gosec // should not be sanitized
+		return template.HTML(rendered), nil
+	}
+}
+
+func splitIntoRawSlides(markdown string, renderCfg config.Rendering) ([]rawSlide, error) {
+	var (
+		verticalSplit, horizontalSplit *regexp.Regexp
+		err                            error
+	)
+	if verticalSplit, err = regexp.Compile(fmt.Sprintf(splitFormat, renderCfg.VerticalSeparator)); err != nil {
+		return nil, err
+	}
+
+	if horizontalSplit, err = regexp.Compile(fmt.Sprintf(splitFormat, renderCfg.HorizontalSeparator)); err != nil {
+		return nil, err
+	}
+
+	horizontalSlides := horizontalSplit.Split(markdown, -1)
+	slides := make([]rawSlide, 0, len(horizontalSlides))
+	for _, hs := range horizontalSlides {
+		s := rawSlide{
+			Content: hs,
+		}
+		verticalSlides := verticalSplit.Split(hs, -1)
+		s.Children = make([]rawSlide, 0, len(verticalSlides))
+		for _, vs := range verticalSlides {
+			s.Children = append(s.Children, rawSlide{Content: vs})
+		}
+		slides = append(slides, s)
+	}
+
+	return slides, nil
+}

rendering/patterns.go

@@ -0,0 +1,19 @@
+package rendering
+
+import (
+	"fmt"
+	"regexp"
+)
+
+const (
+	// language=regexp
+	notesRegex = `(?i)notes?:`
+	// language=regexp
+	splitFormat = `\r?\n%s\r?\n`
+)
+
+var (
+	htmlElementAttributesRegexp = regexp.MustCompile(`(?P<key>[a-z]+(-[a-z]+)*)="(?P<value>.+)"`)
+	notesRegexp                 = regexp.MustCompile(fmt.Sprintf(`^%s`, notesRegex))
+	notesLineRegexp             = regexp.MustCompile(fmt.Sprintf(`\r?\n%s\r?\n`, notesRegex))
+)

rendering/render_to_reveal.go

@@ -0,0 +1,171 @@
+package rendering
+
+import (
+	"bytes"
+	"encoding/hex"
+	"hash"
+	"html"
+	"html/template"
+	"io"
+	"path"
+
+	"github.com/gomarkdown/markdown/ast"
+)
+
+const (
+	mermaidCodeBlock = "mermaid"
+)
+
+type RevealRenderer struct {
+	Hash hash.Hash
+}
+
+func (r *RevealRenderer) RenderHook(w io.Writer, node ast.Node, entering bool) (ast.WalkStatus, bool) {
+	switch b := node.(type) {
+	case *ast.ListItem:
+		if entering {
+			return r.handleListItem(w, b)
+		}
+		return ast.GoToNext, false
+	case *ast.Text:
+		if !entering {
+			return ast.GoToNext, false
+		}
+		if notesRegexp.Match(b.Literal) {
+			_, err := w.Write([]byte(`<aside class="notes">`))
+			return ast.SkipChildren, err == nil
+		}
+		return ast.GoToNext, false
+	case *ast.CodeBlock:
+		if entering {
+			return r.handleCodeBlock(w, b)
+		}
+		return ast.GoToNext, false
+	case *ast.Image:
+		if entering {
+			return r.handleImage(w, b)
+		}
+		return ast.GoToNext, false
+	default:
+		return ast.GoToNext, false
+	}
+}
+
+func (r *RevealRenderer) handleCodeBlock(w io.Writer, code *ast.CodeBlock) (ast.WalkStatus, bool) {
+	code.Info = bytes.ToLower(code.Info)
+	switch string(code.Info) {
+	case mermaidCodeBlock:
+		output, err := renderCodeTemplate("mermaid.gohtml", code)
+		if err != nil {
+			return ast.GoToNext, false
+		}
+		_, err = w.Write(output)
+		return ast.GoToNext, err == nil
+	default:
+		output, err := renderCodeTemplate("any-code.gohtml", code)
+		if err != nil {
+			return ast.GoToNext, false
+		}
+		_, err = w.Write(output)
+		return ast.GoToNext, err == nil
+	}
+}
+
+func (r *RevealRenderer) handleListItem(w io.Writer, listItem *ast.ListItem) (ast.WalkStatus, bool) {
+	for _, child := range listItem.Children {
+		if p, ok := child.(*ast.Paragraph); ok {
+			if len(p.Children) == 0 {
+				return ast.GoToNext, false
+			}
+
+			data := map[string]any{
+				"Attributes": getAttributesFromChildSpan(p),
+			}
+
+			if rendered, err := renderTemplate("listItem.gohtml", data); err != nil {
+				return ast.GoToNext, false
+			} else if _, err = w.Write(rendered); err != nil {
+				return ast.GoToNext, false
+			}
+
+			return ast.GoToNext, true
+		}
+	}
+	return ast.GoToNext, false
+}
+
+func (r *RevealRenderer) handleImage(w io.Writer, img *ast.Image) (ast.WalkStatus, bool) {
+	var title string
+	if len(img.Children) >= 1 {
+		if txt, ok := img.Children[0].(*ast.Text); ok {
+			title = string(txt.Literal)
+		}
+	}
+
+	data := map[string]any{
+		"ID":              hex.EncodeToString(r.Hash.Sum([]byte(path.Base(string(img.Destination))))),
+		"Attributes":      getAttributesFromChildSpan(img.GetParent()),
+		"ImageSource":     string(img.Destination),
+		"AlternativeText": html.EscapeString(title),
+	}
+
+	if rendered, err := renderTemplate("image.gohtml", data); err != nil {
+		return ast.GoToNext, false
+	} else if _, err = w.Write(rendered); err != nil {
+		return ast.GoToNext, false
+	}
+
+	return ast.SkipChildren, true
+}
+
+func getAttributesFromChildSpan(node ast.Node) []template.HTMLAttr {
+	if getChildren, ok := node.(interface{ GetChildren() []ast.Node }); ok {
+		childs := getChildren.GetChildren()
+		if len(childs) == 0 {
+			return nil
+		}
+		for idx := range childs {
+			if span, ok := childs[idx].(*ast.HTMLSpan); ok {
+				return extractElementAttributes(span)
+			}
+		}
+	}
+	return nil
+}
+
+func extractElementAttributes(htmlSpan *ast.HTMLSpan) (attrs []template.HTMLAttr) {
+	const expectedNumberOfMatches = 4
+	htmlComment := string(htmlSpan.Literal)
+	if htmlComment == "" {
+		return nil
+	}
+	matches := htmlElementAttributesRegexp.FindAllStringSubmatch(htmlComment, -1)
+	attrs = make([]template.HTMLAttr, 0, len(matches))
+	for idx := range matches {
+		if len(matches[idx]) != expectedNumberOfMatches {
+			continue
+		}
+
+		//nolint:gosec // it's the user's responsibility to not skrew this up here
+		attrs = append(attrs, template.HTMLAttr(matches[idx][0]))
+	}
+
+	return attrs
+}
+
+func renderCodeTemplate(templateName string, codeBlock *ast.CodeBlock) (output []byte, err error) {
+	data := map[string]any{
+		//nolint:gosec // need to embed the code in original format without escaping
+		"Code":        template.HTML(codeBlock.Literal),
+		"LineNumbers": lineNumbers(codeBlock.Attribute),
+	}
+
+	return renderTemplate(templateName, data)
+}
+
+func lineNumbers(attrs *ast.Attribute) string {
+	if attrs == nil || attrs.Attrs == nil {
+		return ""
+	}
+	return string(attrs.Attrs["line-numbers"])
+}

rendering/templates.go

@@ -0,0 +1,60 @@
+package rendering
+
+import (
+	"embed"
+	"hash/fnv"
+	"html/template"
+
+	"github.com/Masterminds/sprig/v3"
+	"github.com/gomarkdown/markdown"
+	mdhtml "github.com/gomarkdown/markdown/html"
+	"github.com/gomarkdown/markdown/parser"
+	"github.com/valyala/bytebufferpool"
+
+	"code.icb4dc0.de/prskr/goveal/rendering/emoji"
+)
+
+var (
+	//go:embed templates/*.gohtml
+	templatesFS embed.FS
+	templates   *template.Template
+)
+
+func init() {
+	templates = template.New("rendering").
+		Funcs(sprig.FuncMap()).
+		Funcs(template.FuncMap{
+			"renderMarkdown": func(md string) template.HTML {
+				rr := &RevealRenderer{
+					Hash: fnv.New32a(),
+				}
+
+				emojis := emoji.NewEmojiParser()
+				mdParser := parser.NewWithExtensions(parserExtensions)
+				mdParser.Opts.ParserHook = emojis.EmojiParser
+				renderer := mdhtml.NewRenderer(mdhtml.RendererOptions{
+					Flags:          mdhtml.CommonFlags | mdhtml.HrefTargetBlank,
+					RenderNodeHook: rr.RenderHook,
+				})
+
+				renderedHTML := markdown.ToHTML([]byte(md), mdParser, renderer)
+				//nolint:gosec // template should be esacped
+				return template.HTML(renderedHTML)
+			},
+		})
+	var err error
+	if templates, err = templates.ParseFS(templatesFS, "templates/*.gohtml"); err != nil {
+		panic(err)
+	}
+}
+
+func renderTemplate(templateName string, data any) (output []byte, err error) {
+	buffer := bytebufferpool.Get()
+	defer func() {
+		buffer.Reset()
+		bytebufferpool.Put(buffer)
+	}()
+
+	err = templates.ExecuteTemplate(buffer, templateName, data)
+	return buffer.Bytes(), err
+}

rendering/templates/any-code.gohtml

@@ -0,0 +1,6 @@
+<pre><code
+        {{ if .LineNumbers }} data-line-numbers="{{ .LineNumbers }}" {{ end }}
+        data-trim
+        data-noescape>
+    {{- .Code }}
+</code></pre>

rendering/templates/image.gohtml

@@ -0,0 +1,8 @@
+<img
+        data-src="{{ .ImageSource }}"
+        alt="{{ .AlternativeText }}"
+        id="{{ .ID }}"
+        {{ range .Attributes }}
+        {{- . }}
+        {{ end }}
+/>

rendering/templates/listItem.gohtml

@@ -0,0 +1,5 @@
+<li
+        {{ range $key, $value := .Attributes }}
+            {{ $value }}
+        {{ end }}
+>

rendering/templates/mermaid.gohtml

@@ -0,0 +1,3 @@
+<div class="mermaid">
+  {{- .Code -}}
+</div>

rendering/templates/slide.gohtml

@@ -0,0 +1,12 @@
+<section>
+    {{ if .Children }}
+        {{ range .Children }}
+            {{ .ToHTML }}
+        {{ end }}
+    {{ else }}
+        {{ renderMarkdown .Content }}
+    {{ end }}
+    {{ if .HasNotes }}
+        </aside>
+    {{ end }}
+</section>

renovate.json

@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "config:base"
+  ]
+}

web/css/site.css

@@ -0,0 +1,7 @@
+img.emoji {
+    cursor: pointer;
+    height: 1em;
+    width: 1em;
+    margin: 0 .05em 0 .1em;
+    vertical-align: -0.1em;
+}

web/index.gohtml

@@ -0,0 +1,37 @@
+<!doctype html>
+<html lang="en">
+
+<head>
+    <meta charset="utf-8">
+
+    <title>goveal</title>
+
+    <link rel="stylesheet" href="/css/site.css">
+    <link rel="stylesheet" href="/reveal/dist/reveal.css">
+    <link rel="stylesheet" href="/reveal/dist/reset.css">
+    <link rel="stylesheet" href="/reveal/dist/theme/{{ .Reveal.Theme }}.css" id="theme">
+
+    <link rel="stylesheet" href="/reveal/plugin/highlight/{{ .Reveal.CodeTheme }}.css">
+
+    {{ range .Rendering.Stylesheets}}
+        <link id="{{ fileId . }}" rel="stylesheet" href="/{{ . }}">
+    {{ end }}
+</head>
+
+<body>
+
+<div class="reveal">
+    <div id="content-root" class="slides">
+    </div>
+</div>
+
+<script src="/reveal/dist/reveal.js"></script>
+<script src="/reveal/plugin/highlight/highlight.js"></script>
+<script src="/reveal/plugin/notes/notes.js"></script>
+<script src="/reveal/plugin/menu/menu.js"></script>
+<script src="/mermaid/mermaid.min.js"></script>
+<script src="/js/app.js"></script>
+
+
+</body>
+</html>

web/js/app.js

@@ -0,0 +1,132 @@
+document.addEventListener("DOMContentLoaded", _ => {
+    Promise.all([initMermaid(), setSlidesContent()])
+        .then(() => {
+            return initReveal()
+        })
+        .then(() => {
+            subscribeToEvents()
+        })
+
+});
+
+async function setSlidesContent() {
+    let resp = await fetch("/slides")
+    let contentText = await resp.text()
+    let parser = new DOMParser()
+    let contentDocument = parser.parseFromString(contentText, 'text/html')
+    for (let mermaidElem of contentDocument.getElementsByClassName("mermaid")) {
+        let insertSVG = (svgCode, _) => {
+            mermaidElem.innerHTML = svgCode
+        }
+
+        mermaid.mermaidAPI.render('mermaid', mermaidElem.innerText, insertSVG)
+    }
+    document.getElementById("content-root").innerHTML = contentDocument.documentElement.innerHTML
+}
+
+async function getRevealConfig() {
+    let resp = await fetch('/api/v1/config/reveal')
+    return await resp.json()
+}
+
+async function initReveal() {
+    let cfg = await getRevealConfig()
+    Reveal.initialize({
+        controls: cfg.controls,
+        controlsLayout: cfg.controlsLayout,
+        progress: cfg.progress,
+        history: cfg.history,
+        center: cfg.center,
+        slideNumber: cfg.slideNumber,
+        transition: cfg.transition,
+        width: cfg.width,
+        height: cfg.height,
+        hash: true,
+        pdfSeparateFragments: false,
+        menu: {
+            numbers: cfg.menu.numbers,
+            useTextContentForMissingTitles: cfg.menu.useTextContentForMissingTitles,
+            transitions: cfg.menu.transitions,
+            hideMissingTitles: cfg.hideMissingTitles,
+            markers: cfg.menu.markers,
+            openButton: cfg.menu.openButton,
+            custom: [
+                {
+                    title: 'Print',
+                    icon: '<i class="fas fa-print"></i>',
+                    content: '<a href="/?print-pdf">Go to print view<a/>'
+                }
+            ],
+            themes: [
+                {name: 'Beige', theme: '/reveal/dist/theme/beige.css'},
+                {name: 'Black', theme: '/reveal/dist/theme/black.css'},
+                {name: 'Blood', theme: '/reveal/dist/theme/blood.css'},
+                {name: 'League', theme: '/reveal/dist/theme/league.css'},
+                {name: 'Moon', theme: '/reveal/dist/theme/moon.css'},
+                {name: 'Night', theme: '/reveal/dist/theme/night.css'},
+                {name: 'Serif', theme: '/reveal/dist/theme/serif.css'},
+                {name: 'Simple', theme: '/reveal/dist/theme/simple.css'},
+                {name: 'Sky', theme: '/reveal/dist/theme/sky.css'},
+                {name: 'Solarized', theme: '/reveal/dist/theme/solarized.css'},
+                {name: 'White', theme: '/reveal/dist/theme/white.css'}
+            ],
+        },
+        plugins: [RevealHighlight, RevealNotes, RevealMenu]
+    })
+}
+
+async function initMermaid() {
+    let resp = await fetch('/api/v1/config/mermaid')
+    let cfg = await resp.json()
+    mermaid.parseError = (err, hash) => {
+        console.error(`Failed to parse Mermaid diagraph: ${err} - ${hash}`)
+    }
+    mermaid.initialize({
+        startOnLoad: false,
+        theme: cfg.theme,
+        securityLevel: 'loose',
+    });
+}
+
+function subscribeToEvents() {
+    let eventSource = new EventSource("/api/v1/events");
+
+    eventSource.onopen = (() => {
+        console.debug("eventsource connection open");
+    })
+
+    eventSource.onerror = (ev => {
+        if (ev.target.readyState === 0) {
+            console.debug("reconnecting to eventsource");
+        } else {
+            console.error("eventsource error", ev);
+        }
+    })
+
+    eventSource.onmessage = (ev => {
+        let obj = JSON.parse(ev.data);
+        switch (true) {
+            case obj.forceReload:
+                eventSource.close()
+                window.location.reload()
+                break
+            case obj.reloadConfig:
+                getRevealConfig().then(cfg => {
+                    Reveal.configure(cfg)
+                })
+                break
+            default:
+                switch (true) {
+                    case obj.file.endsWith(".css"):
+                        let cssLink = document.querySelector(`link[rel=stylesheet][id="${obj.fileNameHash}"]`);
+                        cssLink.href = `${obj.file}?ts=${obj.ts}`
+                        break
+                    default:
+                        let elem = document.getElementById(obj.fileNameHash);
+                        if (elem !== null) {
+                            elem.src = `${obj.file}?ts=${obj.ts}`
+                        }
+                }
+        }
+    })
+}

web/web.go

@@ -0,0 +1,6 @@
+package web
+
+import "embed"
+
+//go:embed js/* css/* index.gohtml
+var WebFS embed.FS