Add golangci-lint

.golangci.yml

@@ -0,0 +1,121 @@
+linters-settings:
+  dupl:
+    threshold: 100
+  funlen:
+    lines: 100
+    statements: 50
+  gci:
+    local-prefixes: github.com/baez90/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: github.com/baez90/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:
+    - deadcode
+    - dogsled
+    - dupl
+    - errcheck
+    - exhaustive
+    - exportloopref
+    - funlen
+    - gocognit
+    - goconst
+    - gocritic
+    - gocyclo
+    - godox
+    - gofumpt
+    - goimports
+    - gomnd
+    - gosec
+    - gosimple
+    - govet
+    - importas
+    - ineffassign
+    - lll
+    - misspell
+    - nakedret
+    - nestif
+    - noctx
+    - nolintlint
+    - paralleltest
+    - prealloc
+    - promlinter
+    - staticcheck
+    - structcheck
+    - stylecheck
+    - testpackage
+    - thelper
+    - typecheck
+    - unconvert
+    - unparam
+    - varcheck
+    - whitespace
+
+    #- unused
+
+issues:
+  # Excluding configuration per-path, per-linter, per-text and per-source
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - gomnd
+        - funlen
+
+run:
+  build-tags:
+    - sudo
+  skip-dirs:
+    - internal/mock
+  skip-files:
+    - ".*\\.pb\\.go$"
+    - ".*.mock.\\.go$"
+
+service:
+  golangci-lint-version: 1.43.x # use the fixed version to not introduce new linters unexpectedly

.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

api/config.go

@@ -11,9 +11,9 @@ type ConfigAPI struct {
 }
 
 func RegisterConfigAPI(app *fiber.App, cfg *config.Components) {
-	cfgApi := &ConfigAPI{cfg: cfg}
-	app.Get("/api/v1/config/reveal", cfgApi.RevealConfig)
-	app.Get("/api/v1/config/mermaid", cfgApi.MermaidConfig)
+	cfgAPI := &ConfigAPI{cfg: cfg}
+	app.Get("/api/v1/config/reveal", cfgAPI.RevealConfig)
+	app.Get("/api/v1/config/mermaid", cfgAPI.MermaidConfig)
 }
 
 func (a *ConfigAPI) RevealConfig(ctx *fiber.Ctx) error {

assets/assets.go

@@ -2,7 +2,5 @@ package assets
 
 import "embed"
 
-var (
 //go:embed reveal mermaid/mermaid.min.js
-	Assets embed.FS
-)
+var Assets embed.FS

cmd/goveal/root.go

@@ -23,6 +23,7 @@ import (
 	"github.com/baez90/goveal/config"
 )
 
+//nolint:lll // explanations are rather long
 var (
 	cfgFile string
 	rootCmd = &cobra.Command{

config/components.go

@@ -1,7 +1,6 @@
 package config
 
-var (
-	defaults = map[string]interface{}{
+var defaults = map[string]interface{}{
 	"mermaid.theme":                       "forest",
 	"theme":                               "beige",
 	"codeTheme":                           "monokai",
@@ -15,7 +14,6 @@ var (
 	"menu.numbers":                        true,
 	"menu.useTextContentForMissingTitles": true,
 }
-)
 
 const (
 	TransitionNone    Transition = "none"
@@ -65,10 +63,5 @@ type (
 )
 
 func (t Transition) String() string {
-	switch t {
-	case TransitionNone:
-		return "none"
-	default:
 	return string(t)
 }
-}

fs/layered.go

@@ -5,8 +5,10 @@ import (
 	"os"
 )
 
-type FS = fs.FS
-type File = fs.File
+type (
+	FS   = fs.FS
+	File = fs.File
+)
 
 var Dir = os.DirFS
 

rendering/render_to_reveal.go

@@ -47,6 +47,7 @@ type RevealRenderer struct {
 	hasNotes     bool
 }
 
+//nolint:gocyclo // under construction
 func (r *RevealRenderer) RenderHook(w io.Writer, node ast.Node, entering bool) (ast.WalkStatus, bool) {
 	switch b := node.(type) {
 	case *ast.Document:
@@ -82,7 +83,7 @@ func (r *RevealRenderer) RenderHook(w io.Writer, node ast.Node, entering bool) (
 		return ast.GoToNext, false
 	case *ast.HorizontalRule:
 		next := peekNextRuler(b)
-		var input = string(b.Literal)
+		input := string(b.Literal)
 		if next != nil {
 			input += string(next.Literal)
 		}
@@ -185,6 +186,7 @@ func getAttributesFromChildSpan(node ast.Node) []template.HTMLAttr {
 }
 
 func extractElementAttributes(htmlSpan *ast.HTMLSpan) (attrs []template.HTMLAttr) {
+	const expectedNumberOfMatches = 4
 	htmlComment := string(htmlSpan.Literal)
 	if htmlComment == "" {
 		return nil
@@ -192,7 +194,7 @@ func extractElementAttributes(htmlSpan *ast.HTMLSpan) (attrs []template.HTMLAttr
 	matches := htmlElementAttributesRegexp.FindAllStringSubmatch(htmlComment, -1)
 	attrs = make([]template.HTMLAttr, 0, len(matches))
 	for idx := range matches {
-		if len(matches[idx]) != 4 {
+		if len(matches[idx]) != expectedNumberOfMatches {
 			continue
 		}
 

rendering/state.go

@@ -18,8 +18,7 @@ const (
 	StateTypeNested
 )
 
-var (
-	EventMapping = map[EventType][]byte{
+var EventMapping = map[EventType][]byte{
 	EventTypeHorizontalSplit: []byte(`
 </section>
 <section>`),
@@ -45,7 +44,6 @@ var (
 <section>
 <section>`),
 }
-)
 
 func NewStateMachine(verticalSplit, horizontalSplit string) *StateMachine {
 	return &StateMachine{