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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Adapted from rustc's path_relative_from
// https://github.com/rust-lang/rust/blob/e1d0de82cc40b666b88d4a6d2c9dcbc81d7ed27f/src/librustc_back/rpath.rs#L116-L158
use std::path::*;
/// Construct a relative path from a provided base directory path to the provided path.
///
/// ```rust
/// use pathdiff::diff_paths;
/// use std::path::*;
///
/// let baz = "/foo/bar/baz";
/// let bar = "/foo/bar";
/// let quux = "/foo/bar/quux";
/// assert_eq!(diff_paths(bar, baz), Some("../".into()));
/// assert_eq!(diff_paths(baz, bar), Some("baz".into()));
/// assert_eq!(diff_paths(quux, baz), Some("../quux".into()));
/// assert_eq!(diff_paths(baz, quux), Some("../baz".into()));
/// assert_eq!(diff_paths(bar, quux), Some("../".into()));
///
/// assert_eq!(diff_paths(&baz, &bar.to_string()), Some("baz".into()));
/// assert_eq!(diff_paths(Path::new(baz), Path::new(bar).to_path_buf()), Some("baz".into()));
/// ```
pub fn diff_paths<P, B>(path: P, base: B) -> Option<PathBuf>
where
P: AsRef<Path>,
B: AsRef<Path>,
{
let path = path.as_ref();
let base = base.as_ref();
if path.is_absolute() != base.is_absolute() {
if path.is_absolute() {
Some(PathBuf::from(path))
} else {
None
}
} else {
let mut ita = path.components();
let mut itb = base.components();
let mut comps: Vec<Component> = vec![];
loop {
match (ita.next(), itb.next()) {
(None, None) => break,
(Some(a), None) => {
comps.push(a);
comps.extend(ita.by_ref());
break;
}
(None, _) => comps.push(Component::ParentDir),
(Some(a), Some(b)) if comps.is_empty() && a == b => (),
(Some(a), Some(b)) if b == Component::CurDir => comps.push(a),
(Some(_), Some(b)) if b == Component::ParentDir => return None,
(Some(a), Some(_)) => {
comps.push(Component::ParentDir);
for _ in itb {
comps.push(Component::ParentDir);
}
comps.push(a);
comps.extend(ita.by_ref());
break;
}
}
}
Some(comps.iter().map(|c| c.as_os_str()).collect())
}
}
#[cfg(feature = "camino")]
mod utf8_paths {
use camino::{Utf8Component, Utf8Path, Utf8PathBuf};
/// Construct a relative UTF-8 path from a provided base directory path to the provided path.
///
/// ```rust
/// # extern crate camino;
/// use camino::*;
/// use pathdiff::diff_utf8_paths;
///
/// let baz = "/foo/bar/baz";
/// let bar = "/foo/bar";
/// let quux = "/foo/bar/quux";
/// assert_eq!(diff_utf8_paths(bar, baz), Some("../".into()));
/// assert_eq!(diff_utf8_paths(baz, bar), Some("baz".into()));
/// assert_eq!(diff_utf8_paths(quux, baz), Some("../quux".into()));
/// assert_eq!(diff_utf8_paths(baz, quux), Some("../baz".into()));
/// assert_eq!(diff_utf8_paths(bar, quux), Some("../".into()));
///
/// assert_eq!(diff_utf8_paths(&baz, &bar.to_string()), Some("baz".into()));
/// assert_eq!(diff_utf8_paths(Utf8Path::new(baz), Utf8Path::new(bar).to_path_buf()), Some("baz".into()));
/// ```
#[cfg_attr(docsrs, doc(cfg(feature = "camino")))]
pub fn diff_utf8_paths<P, B>(path: P, base: B) -> Option<Utf8PathBuf>
where
P: AsRef<Utf8Path>,
B: AsRef<Utf8Path>,
{
let path = path.as_ref();
let base = base.as_ref();
if path.is_absolute() != base.is_absolute() {
if path.is_absolute() {
Some(Utf8PathBuf::from(path))
} else {
None
}
} else {
let mut ita = path.components();
let mut itb = base.components();
let mut comps: Vec<Utf8Component> = vec![];
loop {
match (ita.next(), itb.next()) {
(None, None) => break,
(Some(a), None) => {
comps.push(a);
comps.extend(ita.by_ref());
break;
}
(None, _) => comps.push(Utf8Component::ParentDir),
(Some(a), Some(b)) if comps.is_empty() && a == b => (),
(Some(a), Some(b)) if b == Utf8Component::CurDir => comps.push(a),
(Some(_), Some(b)) if b == Utf8Component::ParentDir => return None,
(Some(a), Some(_)) => {
comps.push(Utf8Component::ParentDir);
for _ in itb {
comps.push(Utf8Component::ParentDir);
}
comps.push(a);
comps.extend(ita.by_ref());
break;
}
}
}
Some(comps.iter().map(|c| c.as_str()).collect())
}
}
}
#[cfg(feature = "camino")]
pub use crate::utf8_paths::*;
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_absolute() {
assert_diff_paths("/foo", "/bar", Some("../foo"));
assert_diff_paths("/foo", "bar", Some("/foo"));
assert_diff_paths("foo", "/bar", None);
assert_diff_paths("foo", "bar", Some("../foo"));
}
#[test]
fn test_identity() {
assert_diff_paths(".", ".", Some(""));
assert_diff_paths("../foo", "../foo", Some(""));
assert_diff_paths("./foo", "./foo", Some(""));
assert_diff_paths("/foo", "/foo", Some(""));
assert_diff_paths("foo", "foo", Some(""));
assert_diff_paths("../foo/bar/baz", "../foo/bar/baz", Some("".into()));
assert_diff_paths("foo/bar/baz", "foo/bar/baz", Some(""));
}
#[test]
fn test_subset() {
assert_diff_paths("foo", "fo", Some("../foo"));
assert_diff_paths("fo", "foo", Some("../fo"));
}
#[test]
fn test_empty() {
assert_diff_paths("", "", Some(""));
assert_diff_paths("foo", "", Some("foo"));
assert_diff_paths("", "foo", Some(".."));
}
#[test]
fn test_relative() {
assert_diff_paths("../foo", "../bar", Some("../foo"));
assert_diff_paths("../foo", "../foo/bar/baz", Some("../.."));
assert_diff_paths("../foo/bar/baz", "../foo", Some("bar/baz"));
assert_diff_paths("foo/bar/baz", "foo", Some("bar/baz"));
assert_diff_paths("foo/bar/baz", "foo/bar", Some("baz"));
assert_diff_paths("foo/bar/baz", "foo/bar/baz", Some(""));
assert_diff_paths("foo/bar/baz", "foo/bar/baz/", Some(""));
assert_diff_paths("foo/bar/baz/", "foo", Some("bar/baz"));
assert_diff_paths("foo/bar/baz/", "foo/bar", Some("baz"));
assert_diff_paths("foo/bar/baz/", "foo/bar/baz", Some(""));
assert_diff_paths("foo/bar/baz/", "foo/bar/baz/", Some(""));
assert_diff_paths("foo/bar/baz", "foo/", Some("bar/baz"));
assert_diff_paths("foo/bar/baz", "foo/bar/", Some("baz"));
assert_diff_paths("foo/bar/baz", "foo/bar/baz", Some(""));
}
#[test]
fn test_current_directory() {
assert_diff_paths(".", "foo", Some("../."));
assert_diff_paths("foo", ".", Some("foo"));
assert_diff_paths("/foo", "/.", Some("foo"));
}
fn assert_diff_paths(path: &str, base: &str, expected: Option<&str>) {
assert_eq!(diff_paths(path, base), expected.map(|s| s.into()));
#[cfg(feature = "camino")]
assert_eq!(diff_utf8_paths(path, base), expected.map(|s| s.into()));
}
}
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