Create a struct with all of Hugo's config options

Primary motivation is documentation, but it will also hopefully simplify the code.

Also,

* Lower case the default output format names; this is in line with the custom ones (map keys) and how
it's treated all the places. This avoids doing `stringds.EqualFold` everywhere.

Closes #10896
Closes #10620

media/builtin.go

@@ -0,0 +1,163 @@
+package media
+
+type BuiltinTypes struct {
+	CalendarType   Type
+	CSSType        Type
+	SCSSType       Type
+	SASSType       Type
+	CSVType        Type
+	HTMLType       Type
+	JavascriptType Type
+	TypeScriptType Type
+	TSXType        Type
+	JSXType        Type
+
+	JSONType           Type
+	WebAppManifestType Type
+	RSSType            Type
+	XMLType            Type
+	SVGType            Type
+	TextType           Type
+	TOMLType           Type
+	YAMLType           Type
+
+	// Common image types
+	PNGType  Type
+	JPEGType Type
+	GIFType  Type
+	TIFFType Type
+	BMPType  Type
+	WEBPType Type
+
+	// Common font types
+	TrueTypeFontType Type
+	OpenTypeFontType Type
+
+	// Common document types
+	PDFType      Type
+	MarkdownType Type
+
+	// Common video types
+	AVIType  Type
+	MPEGType Type
+	MP4Type  Type
+	OGGType  Type
+	WEBMType Type
+	GPPType  Type
+
+	// wasm
+	WasmType Type
+
+	OctetType Type
+}
+
+var (
+	Builtin = BuiltinTypes{
+		CalendarType:   Type{Type: "text/calendar"},
+		CSSType:        Type{Type: "text/css"},
+		SCSSType:       Type{Type: "text/x-scss"},
+		SASSType:       Type{Type: "text/x-sass"},
+		CSVType:        Type{Type: "text/csv"},
+		HTMLType:       Type{Type: "text/html"},
+		JavascriptType: Type{Type: "text/javascript"},
+		TypeScriptType: Type{Type: "text/typescript"},
+		TSXType:        Type{Type: "text/tsx"},
+		JSXType:        Type{Type: "text/jsx"},
+
+		JSONType:           Type{Type: "application/json"},
+		WebAppManifestType: Type{Type: "application/manifest+json"},
+		RSSType:            Type{Type: "application/rss+xml"},
+		XMLType:            Type{Type: "application/xml"},
+		SVGType:            Type{Type: "image/svg+xml"},
+		TextType:           Type{Type: "text/plain"},
+		TOMLType:           Type{Type: "application/toml"},
+		YAMLType:           Type{Type: "application/yaml"},
+
+		// Common image types
+		PNGType:  Type{Type: "image/png"},
+		JPEGType: Type{Type: "image/jpeg"},
+		GIFType:  Type{Type: "image/gif"},
+		TIFFType: Type{Type: "image/tiff"},
+		BMPType:  Type{Type: "image/bmp"},
+		WEBPType: Type{Type: "image/webp"},
+
+		// Common font types
+		TrueTypeFontType: Type{Type: "font/ttf"},
+		OpenTypeFontType: Type{Type: "font/otf"},
+
+		// Common document types
+		PDFType:      Type{Type: "application/pdf"},
+		MarkdownType: Type{Type: "text/markdown"},
+
+		// Common video types
+		AVIType:  Type{Type: "video/x-msvideo"},
+		MPEGType: Type{Type: "video/mpeg"},
+		MP4Type:  Type{Type: "video/mp4"},
+		OGGType:  Type{Type: "video/ogg"},
+		WEBMType: Type{Type: "video/webm"},
+		GPPType:  Type{Type: "video/3gpp"},
+
+		// Web assembly.
+		WasmType: Type{Type: "application/wasm"},
+
+		OctetType: Type{Type: "application/octet-stream"},
+	}
+)
+
+var defaultMediaTypesConfig = map[string]any{
+	"text/calendar":   map[string]any{"suffixes": []string{"ics"}},
+	"text/css":        map[string]any{"suffixes": []string{"css"}},
+	"text/x-scss":     map[string]any{"suffixes": []string{"scss"}},
+	"text/x-sass":     map[string]any{"suffixes": []string{"sass"}},
+	"text/csv":        map[string]any{"suffixes": []string{"csv"}},
+	"text/html":       map[string]any{"suffixes": []string{"html"}},
+	"text/javascript": map[string]any{"suffixes": []string{"js", "jsm", "mjs"}},
+	"text/typescript": map[string]any{"suffixes": []string{"ts"}},
+	"text/tsx":        map[string]any{"suffixes": []string{"tsx"}},
+	"text/jsx":        map[string]any{"suffixes": []string{"jsx"}},
+
+	"application/json":          map[string]any{"suffixes": []string{"json"}},
+	"application/manifest+json": map[string]any{"suffixes": []string{"webmanifest"}},
+	"application/rss+xml":       map[string]any{"suffixes": []string{"xml", "rss"}},
+	"application/xml":           map[string]any{"suffixes": []string{"xml"}},
+	"image/svg+xml":             map[string]any{"suffixes": []string{"svg"}},
+	"text/plain":                map[string]any{"suffixes": []string{"txt"}},
+	"application/toml":          map[string]any{"suffixes": []string{"toml"}},
+	"application/yaml":          map[string]any{"suffixes": []string{"yaml", "yml"}},
+
+	// Common image types
+	"image/png":  map[string]any{"suffixes": []string{"png"}},
+	"image/jpeg": map[string]any{"suffixes": []string{"jpg", "jpeg", "jpe", "jif", "jfif"}},
+	"image/gif":  map[string]any{"suffixes": []string{"gif"}},
+	"image/tiff": map[string]any{"suffixes": []string{"tif", "tiff"}},
+	"image/bmp":  map[string]any{"suffixes": []string{"bmp"}},
+	"image/webp": map[string]any{"suffixes": []string{"webp"}},
+
+	// Common font types
+	"font/ttf": map[string]any{"suffixes": []string{"ttf"}},
+	"font/otf": map[string]any{"suffixes": []string{"otf"}},
+
+	// Common document types
+	"application/pdf": map[string]any{"suffixes": []string{"pdf"}},
+	"text/markdown":   map[string]any{"suffixes": []string{"md", "markdown"}},
+
+	// Common video types
+	"video/x-msvideo": map[string]any{"suffixes": []string{"avi"}},
+	"video/mpeg":      map[string]any{"suffixes": []string{"mpg", "mpeg"}},
+	"video/mp4":       map[string]any{"suffixes": []string{"mp4"}},
+	"video/ogg":       map[string]any{"suffixes": []string{"ogv"}},
+	"video/webm":      map[string]any{"suffixes": []string{"webm"}},
+	"video/3gpp":      map[string]any{"suffixes": []string{"3gpp", "3gp"}},
+
+	// wasm
+	"application/wasm": map[string]any{"suffixes": []string{"wasm"}},
+
+	"application/octet-stream": map[string]any{},
+}
+
+func init() {
+	// Apply delimiter to all.
+	for _, m := range defaultMediaTypesConfig {
+		m.(map[string]any)["delimiter"] = "."
+	}
+}