combo/tmpl/tmpl.go

package tmpl

import (
	"os"
	"fmt"
	"bufio"
	"io"
	"vultras.su/core/cli/mtool"
)

var(
	delim rune
	Tool = mtool.T("tmpl").Func(Run).Desc(
		"substitute the inputted runes with the specified words",
	).Usage(
		"[n_utf8_chars] [n_strings]",
	)
)


func Run(flags *mtool.Flags) {
	delim = '\n'
	args := flags.Parse()
	
	if len(args)<2 || len(args[0]) != len(args)-1 {
		flags.Usage()
		os.Exit(1)
	}

	chrs := []rune(args[0])
	args = args[1:]

	tmpl := make(map[rune] string)
	for i, s := range args {
		tmpl[rune(chrs[i])] = s
	}

	r := bufio.NewReader(os.Stdin)
	for{
		s, e := r.ReadString(byte(delim))
		if e==io.EOF {
			break
		}
		s = s[:len(s)-1]
		for _, c := range s {
			s, ok := tmpl[c]
			if !ok {
				s = string(c)
			}
			fmt.Printf("%s", s)
		}
		fmt.Printf("%s", string(delim))
	}
}