Converts colour settings from minttyrc to Windows Terminal

mtt.go

package main

// This programme generates Windows Terminal colorScheme definition from minttyrc.

import (
	"bufio"
	"errors"
	"fmt"
	"io"
	"os"
	"strconv"
	"strings"
)

var colorTable map[string]string

func init() {
	colorTable = map[string]string{
		"CursorColour":     "cursorColor",
		"ForegroundColour": "foreground",
		"BackgroundColour": "background",
		"Black":            "black",
		"BoldBlack":        "brightBlack",
		"Red":              "red",
		"BoldRed":          "brightRed",
		"Green":            "green",
		"BoldGreen":        "brightGreen",
		"Yellow":           "yellow",
		"BoldYellow":       "brightYellow",
		"Blue":             "blue",
		"BoldBlue":         "brightBlue",
		"Magenta":          "purple",
		"BoldMagenta":      "brightPurple",
		"Cyan":             "cyan",
		"BoldCyan":         "brightCyan",
		"White":            "white",
		"BoldWhite":        "brightWhite",
	}
}

func rgbToHex(r string, g string, b string) (string, error) {
	red, _ := strconv.Atoi(r)
	green, _ := strconv.Atoi(g)
	blue, _ := strconv.Atoi(b)

	if red > 255 || green > 255 || blue > 255 {
		return "", errors.New("RGB value has to be 255 or less.")
	}

	return fmt.Sprintf("#%02x%02x%02x", red, green, blue), nil
}

func isColorSetting(line string) bool {

	for k, _ := range colorTable {
		if strings.HasPrefix(strings.TrimRight(line, "\n"), k) {
			return true
		}
	}

	return false
}

func main() {

	if len(os.Args) < 2 {
		fmt.Printf("Usage: %s minttyrc\n", os.Args[0])
		os.Exit(1)
	}

	b, err := os.OpenFile(os.Args[1], os.O_RDONLY, os.ModePerm)
	if err != nil {
		fmt.Println("Error reading the file.")
		fmt.Printf("%v\n", err)
		os.Exit(1)
	}
	defer b.Close()

	reader := bufio.NewReader(b)
	for {
		text, err := reader.ReadString('\n')

		if err == io.EOF {
			os.Exit(0)
		}

		text = strings.TrimRight(text, "\n")

		if !isColorSetting(text) {
			continue
		}

		cols := strings.Split(text, "=")
		key := cols[0]
		rgb := strings.Split(cols[1], ",")

		hex, err := rgbToHex(rgb[0], rgb[1], rgb[2])
		if err != nil {
			fmt.Println(err)
		}

		fmt.Printf("\"%s\": \"%s\",\n", colorTable[key], hex)
	}
}