96 lines
2.0 KiB
Go
96 lines
2.0 KiB
Go
|
package vtclean
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"regexp"
|
||
|
|
"strconv"
|
||
|
|
)
|
||
|
|
|
||
|
|
// regex based on ECMA-48:
|
||
|
|
// 1. optional:
|
||
|
|
// one of [ or ]
|
||
|
|
// any amount of 0x30-0x3f
|
||
|
|
// any amount of 0x20-0x2f
|
||
|
|
// 3. exactly one 0x40-0x7e
|
||
|
|
var vt100re = regexp.MustCompile(`^\033([\[\]]([0-9:;<=>\?]*)([!"#$%&'()*+,\-./]*))?([@A-Z\[\]^_\x60a-z{|}~])`)
|
||
|
|
var vt100exc = regexp.MustCompile(`^\033(\[[^a-zA-Z0-9@\?]+|[\(\)]).`)
|
||
|
|
|
||
|
|
// this is to handle the RGB escape generated by `tput initc 1 500 500 500`
|
||
|
|
var vt100long = regexp.MustCompile(`^\033](\d+);([^\033]+)\033\\`)
|
||
|
|
|
||
|
|
func Clean(line string, color bool) string {
|
||
|
|
var edit = newLineEdit(len(line))
|
||
|
|
lineb := []byte(line)
|
||
|
|
|
||
|
|
hadColor := false
|
||
|
|
for i := 0; i < len(lineb); {
|
||
|
|
c := lineb[i]
|
||
|
|
switch c {
|
||
|
|
case '\r':
|
||
|
|
edit.MoveAbs(0)
|
||
|
|
case '\b':
|
||
|
|
edit.Move(-1)
|
||
|
|
case '\033':
|
||
|
|
// set terminal title
|
||
|
|
if bytes.HasPrefix(lineb[i:], []byte("\x1b]0;")) {
|
||
|
|
pos := bytes.Index(lineb[i:], []byte("\a"))
|
||
|
|
if pos != -1 {
|
||
|
|
i += pos + 1
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if m := vt100long.Find(lineb[i:]); m != nil {
|
||
|
|
i += len(m)
|
||
|
|
} else if m := vt100exc.Find(lineb[i:]); m != nil {
|
||
|
|
i += len(m)
|
||
|
|
} else if m := vt100re.FindSubmatch(lineb[i:]); m != nil {
|
||
|
|
i += len(m[0])
|
||
|
|
num := string(m[2])
|
||
|
|
n, err := strconv.Atoi(num)
|
||
|
|
if err != nil || n > 10000 {
|
||
|
|
n = 1
|
||
|
|
}
|
||
|
|
switch m[4][0] {
|
||
|
|
case 'm':
|
||
|
|
if color {
|
||
|
|
hadColor = true
|
||
|
|
edit.Vt100(m[0])
|
||
|
|
}
|
||
|
|
case '@':
|
||
|
|
edit.Insert(bytes.Repeat([]byte{' '}, n))
|
||
|
|
case 'G':
|
||
|
|
edit.MoveAbs(n)
|
||
|
|
case 'C':
|
||
|
|
edit.Move(n)
|
||
|
|
case 'D':
|
||
|
|
edit.Move(-n)
|
||
|
|
case 'P':
|
||
|
|
edit.Delete(n)
|
||
|
|
case 'K':
|
||
|
|
switch num {
|
||
|
|
case "", "0":
|
||
|
|
edit.ClearRight()
|
||
|
|
case "1":
|
||
|
|
edit.ClearLeft()
|
||
|
|
case "2":
|
||
|
|
edit.Clear()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
i += 1
|
||
|
|
}
|
||
|
|
continue
|
||
|
|
default:
|
||
|
|
if c == '\n' || c == '\t' || c >= ' ' {
|
||
|
|
edit.Write([]byte{c})
|
||
|
|
}
|
||
|
|
}
|
||
|
|
i += 1
|
||
|
|
}
|
||
|
|
out := edit.Bytes()
|
||
|
|
if hadColor {
|
||
|
|
out = append(out, []byte("\033[0m")...)
|
||
|
|
}
|
||
|
|
return string(out)
|
||
|
|
}
|