go-highlite/examples/syncat.go

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"strings"

	"github.com/fatih/color"
	"github.com/jessp01/highlight"
)

func main() {
	if len(os.Args) <= 1 {
		fmt.Println("No input file")
		return
	}

	gopath := os.Getenv("GOPATH")

	var syn_dir string
	if gopath == "" {
		syn_dir = "/etc/highlight"
	} else {
		syn_dir = gopath + "/src/github.com/jessp01/highlight/syntax_files"
	}

	syn_dir = os.Getenv("SYNDIR")
	var defs []*highlight.Def
	err := highlight.ParseSyntaxFiles(syn_dir, &defs)
	if err != nil {
		log.Fatal(err)
	}

	highlight.ResolveIncludes(defs)

	fileSrc, _ := ioutil.ReadFile(os.Args[1])
	def := highlight.DetectFiletype(defs, os.Args[1], bytes.Split(fileSrc, []byte("\n"))[0])

	if def == nil {
		fmt.Println(string(fileSrc))
		return
	}

	h := highlight.NewHighlighter(def)

	matches := h.HighlightString(string(fileSrc))

	lines := strings.Split(string(fileSrc), "\n")
	for lineN, l := range lines {
		colN := 0
		for _, c := range l {
			if group, ok := matches[lineN][colN]; ok {
				// There are more possible groups available than just these ones
				if group == highlight.Groups["statement"] {
					color.Set(color.FgGreen)
				} else if group == highlight.Groups["identifier"] {
					color.Set(color.FgBlue)
				} else if group == highlight.Groups["preproc"] {
					color.Set(color.FgHiRed)
				} else if group == highlight.Groups["special"] {
					color.Set(color.FgRed)
				} else if group == highlight.Groups["constant.string"] {
					color.Set(color.FgCyan)
				} else if group == highlight.Groups["constant"] {
					color.Set(color.FgCyan)
				} else if group == highlight.Groups["constant.specialChar"] {
					color.Set(color.FgHiMagenta)
				} else if group == highlight.Groups["type"] {
					color.Set(color.FgYellow)
				} else if group == highlight.Groups["constant.number"] {
					color.Set(color.FgCyan)
				} else if group == highlight.Groups["comment"] {
					color.Set(color.FgHiGreen)
				} else {
					color.Unset()
				}
			}
			fmt.Print(string(c))
			colN++
		}
		if group, ok := matches[lineN][colN]; ok {
			if group == highlight.Groups["default"] || group == highlight.Groups[""] {
				color.Unset()
			}
		}

		fmt.Print("\n")
	}
}