75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
/* Simple 'echo' implementation. */
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package echo
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import (
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"os"
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"flag"
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"strings"
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)
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type Echoer struct {
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out *os.File
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backslashMap map[string] string
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}
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func (e Echoer)BackslashInterpret(str string) string {
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for k, v := range e.backslashMap {
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str = strings.ReplaceAll(str, k, v)
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}
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return str
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}
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func (e Echoer)Echo(str string) {
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e.out.Write( []byte(str[:len(str)]) )
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}
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func New(out *os.File, backslashMap map[string] string) *Echoer {
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e := new(Echoer)
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e.out = out
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e.backslashMap = backslashMap
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return e
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}
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func Run(args []string) int {
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var(
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newLineStr string
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newLineFlag bool
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joinStr string
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joinStrsFlag bool
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backslashSeqFlag bool
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)
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seqs := map[string] string {
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"\\\\" : "\\",
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"\\a" : "\a",
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"\\b" : "\b",
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/*"\\c" : "\c",
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"\\e" : "\e",*/
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"\\f" : "\f",
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"\\n" : "\n",
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"\\r" : "\r",
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"\\t" : "\t",
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"\\v" : "\v",
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}
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e := New(os.Stdout, seqs)
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flagSet := flag.NewFlagSet(args[0], flag.ExitOnError)
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flagSet.BoolVar(&newLineFlag, "n", false,
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"Don't add new line character('-N' is lower priority).")
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flagSet.StringVar(&newLineStr, "N", "\n", "Use this instead new line character.")
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flagSet.BoolVar(&joinStrsFlag, "j", false, "Join strings('-J' is lower priority).")
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flagSet.StringVar(&joinStr, "J", " ", "Use instead of space as separator.")
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flagSet.BoolVar(&backslashSeqFlag, "e", false, "Interpret backslash special terminal characters(Characters from join options will be interpreted too).")
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flagSet.Parse(args[1:])
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if newLineFlag {
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newLineStr = ""
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}
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if joinStrsFlag {
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joinStr = ""
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}
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printStr := strings.Join(flagSet.Args(), joinStr) +newLineStr
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if backslashSeqFlag {
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printStr = e.BackslashInterpret(printStr)
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}
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e.Echo(printStr)
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return 0
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}
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