gilo/editor/highlight/syntax.go

package highlight

import (
	"strings"
	"timshome.page/gilo/terminal"
)

// ------------------------------------------------------------------
// Syntax Type -> Color Mapping
// ------------------------------------------------------------------

var syntaxColorMap = map[int]string{
	Comment: terminal.FGCyan,
	String:  terminal.FGMagenta,
	Number:  terminal.FGRed,
	Match:   terminal.FGBlue,
	Normal:  terminal.DefaultFGColor,
}

// SyntaxToColor Take a highlighting type and map it to
// an ANSI color escape code for display
func SyntaxToColor(hl int) string {
	color := syntaxColorMap[hl]
	if len(color) == 0 {
		color = terminal.DefaultFGColor
	}

	return color
}

// ------------------------------------------------------------------
// File Type -> Syntax Mapping
// ------------------------------------------------------------------

type Syntax struct {
	FileType         string
	FileMatch        []string
	LineCommentStart string
	Flags            int
}

// HLDB - The "database" of syntax types
var HLDB = []*Syntax{{
	"c",
	[]string{".c", ".h", ".cpp"},
	"//",
	HighlightNumbers | HighlightStrings,
}, {
	"go",
	[]string{".go", "go.mod"},
	"//",
	HighlightNumbers | HighlightStrings,
}, {
	"makefile",
	[]string{"Makefile", "makefile", "justfile"},
	"#",
	0,
}}

func GetSyntaxByFilename(filename string) *Syntax {
	if filename == "" {
		return nil
	}

	var ext string = ""
	extInd := strings.LastIndex(filename, ".")
	if extInd > -1 {
		ext = filename[extInd:len(filename)]
	}

	for i := 0; i < len(HLDB); i++ {
		s := HLDB[i]
		for j := range s.FileMatch {
			if s.FileMatch[j] == ext || strings.Contains(filename, s.FileMatch[j]) {
				return s
			}
		}
	}

	return nil
}