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use std::borrow::Cow;
use std::env;
pub fn escape(s: Cow<str>) -> Cow<str> {
if cfg!(unix) {
unix::escape(s)
} else if env::var("MSYSTEM").is_ok() {
unix::escape(s)
} else {
windows::escape(s)
}
}
pub mod windows {
use std::borrow::Cow;
use std::iter::repeat;
pub fn escape(s: Cow<str>) -> Cow<str> {
let mut needs_escape = false;
for ch in s.chars() {
match ch {
'"' | '\t' | '\n' | ' ' => needs_escape = true,
_ => {}
}
}
if !needs_escape {
return s
}
let mut es = String::with_capacity(s.len());
es.push('"');
let mut chars = s.chars().peekable();
loop {
let mut nslashes = 0;
while let Some(&'\\') = chars.peek() {
chars.next();
nslashes += 1;
}
match chars.next() {
Some('"') => {
es.extend(repeat('\\').take(nslashes * 2 + 1));
es.push('"');
}
Some(c) => {
es.extend(repeat('\\').take(nslashes));
es.push(c);
}
None => {
es.extend(repeat('\\').take(nslashes * 2));
break;
}
}
}
es.push('"');
es.into()
}
#[test]
fn test_escape() {
assert_eq!(escape("--aaa=bbb-ccc".into()), "--aaa=bbb-ccc");
assert_eq!(escape("linker=gcc -L/foo -Wl,bar".into()),
r#""linker=gcc -L/foo -Wl,bar""#);
assert_eq!(escape(r#"--features="default""#.into()),
r#""--features=\"default\"""#);
assert_eq!(escape(r#"\path\to\my documents\"#.into()),
r#""\path\to\my documents\\""#);
}
}
pub mod unix {
use std::borrow::Cow;
const SHELL_SPECIAL: &'static str = r#" \$'"`!"#;
pub fn escape(s: Cow<str>) -> Cow<str> {
let escape_char = '\\';
let clean = SHELL_SPECIAL.chars().all(|sp_char| !s.contains(sp_char));
if clean {
return s
}
let mut es = String::with_capacity(s.len());
for ch in s.chars() {
if SHELL_SPECIAL.contains(ch) {
es.push(escape_char);
}
es.push(ch)
}
es.into()
}
#[test]
fn test_escape() {
assert_eq!(escape("--aaa=bbb-ccc".into()), "--aaa=bbb-ccc");
assert_eq!(escape("linker=gcc -L/foo -Wl,bar".into()),
r#"linker=gcc\ -L/foo\ -Wl,bar"#);
assert_eq!(escape(r#"--features="default""#.into()),
r#"--features=\"default\""#);
assert_eq!(escape(r#"'!\$`\\\n "#.into()),
r#"\'\!\\\$\`\\\\\\n\ "#);
}
}