Function BashEscape

internal/cmd/shell_bash.go:105–189

BashEscape escapes strings for safe use in Bash. Based on https://github.com/solidsnack/shell-escape/blob/master/Text/ShellEscape/Bash.hs * A Bash escaped string. The strings are wrapped in @$\'...\'@ if any bytes within them must be escaped; otherwise, they are left as is. Newlines and other contro

(str string)

strings will always fit on one line and never contain non-ASCII bytes.
*/
func BashEscape(str string) string {
	if str == "" {
		return "''"
	}
	in := []byte(str)
	out := ""
	i := 0
	l := len(in)
	escape := false

	hex := func(char byte) {
		escape = true
		out += fmt.Sprintf("\\x%02x", char)
	}

	backslash := func(char byte) {
		escape = true
		out += string([]byte{BACKSLASH, char})
	}

	escaped := func(str string) {
		escape = true
		out += str
	}

	quoted := func(char byte) {
		escape = true
		out += string([]byte{char})
	}

	literal := func(char byte) {
		out += string([]byte{char})
	}

	for i < l {
		char := in[i]
		switch {
		case char == ACK:
			hex(char)
		case char == TAB:
			escaped(`\t`)
		case char == LF:
			escaped(`\n`)
		case char == CR:
			escaped(`\r`)
		case char <= US:
			hex(char)
		case char <= AMPERSTAND:
			quoted(char)
		case char == SINGLE_QUOTE:
			backslash(char)
		case char <= PLUS:
			quoted(char)
		case char <= NINE:
			literal(char)
		case char <= QUESTION:
			quoted(char)
		case char <= UPPERCASE_Z: