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package git
import (
"fmt"
"strings"
)
// preReceiveHook returns the bytes of a pre-receive hook script
// that prints m before exiting successfully
func preReceiveHook(m string) []byte {
return []byte(fmt.Sprintf("#!/bin/rc\necho -n %s\n", quote(m)))
}
const quoteChar = '\''
func needsQuote(s string) bool {
for i := 0; i < len(s); i++ {
c := s[i]
if c == quoteChar || c <= ' ' { // quote, blanks, or control characters
return true
}
}
return false
}
// Quote adds single quotes to s in the style of rc(1) if they are needed.
// The behaviour should be identical to Plan 9's quote(3).
func quote(s string) string {
if s == "" {
return "''"
}
if !needsQuote(s) {
return s
}
var b strings.Builder
b.Grow(10 + len(s)) // Enough room for few quotes
b.WriteByte(quoteChar)
for i := 0; i < len(s); i++ {
c := s[i]
if c == quoteChar {
b.WriteByte(quoteChar)
}
b.WriteByte(c)
}
b.WriteByte(quoteChar)
return b.String()
}
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