├── .github └── workflows │ └── rust.yml ├── .gitignore ├── Cargo.toml ├── LICENSE-APACHE ├── LICENSE-MIT └── src └── lib.rs /.github/workflows/rust.yml: -------------------------------------------------------------------------------- 1 | name: Rust 2 | 3 | on: 4 | push: 5 | branches: [ master ] 6 | pull_request: 7 | branches: [ master ] 8 | 9 | env: 10 | CARGO_TERM_COLOR: always 11 | 12 | jobs: 13 | build: 14 | strategy: 15 | matrix: 16 | os: [ubuntu-latest, windows-latest] 17 | 18 | runs-on: ${{ matrix.os }} 19 | 20 | steps: 21 | - uses: actions/checkout@v2 22 | - name: Build 23 | run: cargo build --verbose 24 | - name: Run tests 25 | run: cargo test --verbose 26 | - name: Build (all features) 27 | run: cargo build --all-features --verbose 28 | - name: Run tests (all features) 29 | run: cargo test --all-features --verbose 30 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | /target/ 2 | **/*.rs.bk 3 | Cargo.lock 4 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "pathdiff" 3 | edition = "2018" 4 | version = "0.2.3" 5 | authors = ["Manish Goregaokar "] 6 | description = "Library for diffing paths to obtain relative paths" 7 | documentation = "https://docs.rs/pathdiff/" 8 | repository = "https://github.com/Manishearth/pathdiff" 9 | keywords = ["path", "relative"] 10 | license = "MIT OR Apache-2.0" 11 | 12 | [package.metadata.docs.rs] 13 | all-features = true 14 | 15 | [dependencies] 16 | camino = { version = "1.0.5", optional = true } 17 | 18 | [dev-dependencies] 19 | cfg-if = "1.0.0" 20 | -------------------------------------------------------------------------------- /LICENSE-APACHE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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IN NO EVENT 19 | SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 20 | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR 22 | IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | DEALINGS IN THE SOFTWARE. 24 | -------------------------------------------------------------------------------- /src/lib.rs: -------------------------------------------------------------------------------- 1 | // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT 2 | // file at the top-level directory of this distribution and at 3 | // http://rust-lang.org/COPYRIGHT. 4 | // 5 | // Licensed under the Apache License, Version 2.0 or the MIT license 7 | // , at your 8 | // option. This file may not be copied, modified, or distributed 9 | // except according to those terms. 10 | 11 | // Adapted from rustc's path_relative_from 12 | // https://github.com/rust-lang/rust/blob/e1d0de82cc40b666b88d4a6d2c9dcbc81d7ed27f/src/librustc_back/rpath.rs#L116-L158 13 | 14 | #![cfg_attr(docsrs, feature(doc_cfg))] 15 | 16 | use std::path::*; 17 | 18 | /// Construct a relative path from a provided base directory path to the provided path. 19 | /// 20 | /// ```rust 21 | /// use pathdiff::diff_paths; 22 | /// use std::path::*; 23 | /// 24 | /// assert_eq!(diff_paths("/foo/bar", "/foo/bar/baz"), Some("../".into())); 25 | /// assert_eq!(diff_paths("/foo/bar/baz", "/foo/bar"), Some("baz".into())); 26 | /// assert_eq!(diff_paths("/foo/bar/quux", "/foo/bar/baz"), Some("../quux".into())); 27 | /// assert_eq!(diff_paths("/foo/bar/baz", "/foo/bar/quux"), Some("../baz".into())); 28 | /// assert_eq!(diff_paths("/foo/bar", "/foo/bar/quux"), Some("../".into())); 29 | /// 30 | /// assert_eq!(diff_paths("/foo/bar", "baz"), Some("/foo/bar".into())); 31 | /// assert_eq!(diff_paths("/foo/bar", "/baz"), Some("../foo/bar".into())); 32 | /// assert_eq!(diff_paths("foo", "bar"), Some("../foo".into())); 33 | /// 34 | /// assert_eq!( 35 | /// diff_paths(&"/foo/bar/baz", "/foo/bar".to_string()), 36 | /// Some("baz".into()) 37 | /// ); 38 | /// assert_eq!( 39 | /// diff_paths(Path::new("/foo/bar/baz"), Path::new("/foo/bar").to_path_buf()), 40 | /// Some("baz".into()) 41 | /// ); 42 | /// ``` 43 | pub fn diff_paths(path: P, base: B) -> Option 44 | where 45 | P: AsRef, 46 | B: AsRef, 47 | { 48 | let path = path.as_ref(); 49 | let base = base.as_ref(); 50 | 51 | if path.is_absolute() != base.is_absolute() { 52 | if path.is_absolute() { 53 | Some(PathBuf::from(path)) 54 | } else { 55 | None 56 | } 57 | } else { 58 | let mut ita = path.components(); 59 | let mut itb = base.components(); 60 | let mut comps: Vec = vec![]; 61 | 62 | // ./foo and foo are the same 63 | if let Some(Component::CurDir) = ita.clone().next() { 64 | ita.next(); 65 | } 66 | if let Some(Component::CurDir) = itb.clone().next() { 67 | itb.next(); 68 | } 69 | 70 | loop { 71 | match (ita.next(), itb.next()) { 72 | (None, None) => break, 73 | (Some(a), None) => { 74 | comps.push(a); 75 | comps.extend(ita.by_ref()); 76 | break; 77 | } 78 | (None, _) => comps.push(Component::ParentDir), 79 | (Some(a), Some(b)) if comps.is_empty() && a == b => (), 80 | (Some(a), Some(b)) if b == Component::CurDir => comps.push(a), 81 | (Some(_), Some(b)) if b == Component::ParentDir => return None, 82 | (Some(a), Some(_)) => { 83 | comps.push(Component::ParentDir); 84 | for _ in itb { 85 | comps.push(Component::ParentDir); 86 | } 87 | comps.push(a); 88 | comps.extend(ita.by_ref()); 89 | break; 90 | } 91 | } 92 | } 93 | Some(comps.iter().map(|c| c.as_os_str()).collect()) 94 | } 95 | } 96 | 97 | #[cfg(feature = "camino")] 98 | mod utf8_paths { 99 | use camino::{Utf8Component, Utf8Path, Utf8PathBuf}; 100 | 101 | /// Construct a relative UTF-8 path from a provided base directory path to the provided path. 102 | /// 103 | /// Requires the `camino` feature. 104 | /// 105 | /// ```rust 106 | /// # extern crate camino; 107 | /// use camino::*; 108 | /// use pathdiff::diff_utf8_paths; 109 | /// 110 | /// assert_eq!(diff_utf8_paths("/foo/bar", "/foo/bar/baz"), Some("../".into())); 111 | /// assert_eq!(diff_utf8_paths("/foo/bar/baz", "/foo/bar"), Some("baz".into())); 112 | /// assert_eq!(diff_utf8_paths("/foo/bar/quux", "/foo/bar/baz"), Some("../quux".into())); 113 | /// assert_eq!(diff_utf8_paths("/foo/bar/baz", "/foo/bar/quux"), Some("../baz".into())); 114 | /// assert_eq!(diff_utf8_paths("/foo/bar", "/foo/bar/quux"), Some("../".into())); 115 | /// 116 | /// assert_eq!(diff_utf8_paths("/foo/bar", "baz"), Some("/foo/bar".into())); 117 | /// assert_eq!(diff_utf8_paths("/foo/bar", "/baz"), Some("../foo/bar".into())); 118 | /// assert_eq!(diff_utf8_paths("foo", "bar"), Some("../foo".into())); 119 | /// 120 | /// assert_eq!( 121 | /// diff_utf8_paths(&"/foo/bar/baz", "/foo/bar".to_string()), 122 | /// Some("baz".into()) 123 | /// ); 124 | /// assert_eq!( 125 | /// diff_utf8_paths(Utf8Path::new("/foo/bar/baz"), Utf8Path::new("/foo/bar").to_path_buf()), 126 | /// Some("baz".into()) 127 | /// ); 128 | /// ``` 129 | #[cfg_attr(docsrs, doc(cfg(feature = "camino")))] 130 | pub fn diff_utf8_paths(path: P, base: B) -> Option 131 | where 132 | P: AsRef, 133 | B: AsRef, 134 | { 135 | let path = path.as_ref(); 136 | let base = base.as_ref(); 137 | 138 | if path.is_absolute() != base.is_absolute() { 139 | if path.is_absolute() { 140 | Some(Utf8PathBuf::from(path)) 141 | } else { 142 | None 143 | } 144 | } else { 145 | let mut ita = path.components(); 146 | let mut itb = base.components(); 147 | let mut comps: Vec = vec![]; 148 | 149 | // ./foo and foo are the same 150 | if let Some(Utf8Component::CurDir) = ita.clone().next() { 151 | ita.next(); 152 | } 153 | if let Some(Utf8Component::CurDir) = itb.clone().next() { 154 | itb.next(); 155 | } 156 | 157 | loop { 158 | match (ita.next(), itb.next()) { 159 | (None, None) => break, 160 | (Some(a), None) => { 161 | comps.push(a); 162 | comps.extend(ita.by_ref()); 163 | break; 164 | } 165 | (None, _) => comps.push(Utf8Component::ParentDir), 166 | (Some(a), Some(b)) if comps.is_empty() && a == b => (), 167 | (Some(a), Some(b)) if b == Utf8Component::CurDir => comps.push(a), 168 | (Some(_), Some(b)) if b == Utf8Component::ParentDir => return None, 169 | (Some(a), Some(_)) => { 170 | comps.push(Utf8Component::ParentDir); 171 | for _ in itb { 172 | comps.push(Utf8Component::ParentDir); 173 | } 174 | comps.push(a); 175 | comps.extend(ita.by_ref()); 176 | break; 177 | } 178 | } 179 | } 180 | Some(comps.iter().map(|c| c.as_str()).collect()) 181 | } 182 | } 183 | } 184 | 185 | #[cfg(feature = "camino")] 186 | pub use crate::utf8_paths::*; 187 | 188 | #[cfg(test)] 189 | mod tests { 190 | use super::*; 191 | use cfg_if::cfg_if; 192 | 193 | #[test] 194 | fn test_absolute() { 195 | fn abs(path: &str) -> String { 196 | // Absolute paths look different on Windows vs Unix. 197 | cfg_if! { 198 | if #[cfg(windows)] { 199 | format!("C:\\{}", path) 200 | } else { 201 | format!("/{}", path) 202 | } 203 | } 204 | } 205 | 206 | assert_diff_paths(&abs("foo"), &abs("bar"), Some("../foo")); 207 | assert_diff_paths(&abs("foo"), "bar", Some(&abs("foo"))); 208 | assert_diff_paths("foo", &abs("bar"), None); 209 | assert_diff_paths("foo", "bar", Some("../foo")); 210 | } 211 | 212 | #[test] 213 | fn test_identity() { 214 | assert_diff_paths(".", ".", Some("")); 215 | assert_diff_paths("../foo", "../foo", Some("")); 216 | assert_diff_paths("./foo", "./foo", Some("")); 217 | assert_diff_paths("/foo", "/foo", Some("")); 218 | assert_diff_paths("foo", "foo", Some("")); 219 | assert_diff_paths("./foo", "foo", Some("")); 220 | assert_diff_paths("foo", "./foo", Some("")); 221 | assert_diff_paths("foo/foo", "./foo/foo", Some("")); 222 | 223 | assert_diff_paths("../foo/bar/baz", "../foo/bar/baz", Some("".into())); 224 | assert_diff_paths("foo/bar/baz", "foo/bar/baz", Some("")); 225 | } 226 | 227 | #[test] 228 | fn test_subset() { 229 | assert_diff_paths("foo", "fo", Some("../foo")); 230 | assert_diff_paths("fo", "foo", Some("../fo")); 231 | } 232 | 233 | #[test] 234 | fn test_empty() { 235 | assert_diff_paths("", "", Some("")); 236 | assert_diff_paths("foo", "", Some("foo")); 237 | assert_diff_paths("", "foo", Some("..")); 238 | } 239 | 240 | #[test] 241 | fn test_relative() { 242 | assert_diff_paths("../foo", "../bar", Some("../foo")); 243 | assert_diff_paths("../foo", "../foo/bar/baz", Some("../..")); 244 | assert_diff_paths("../foo/bar/baz", "../foo", Some("bar/baz")); 245 | assert_diff_paths("../foo", "bar", Some("../../foo")); 246 | assert_diff_paths("foo", "../bar", None); 247 | 248 | assert_diff_paths("foo/bar/baz", "foo", Some("bar/baz")); 249 | assert_diff_paths("foo/bar/baz", "foo/bar", Some("baz")); 250 | assert_diff_paths("foo/bar/baz", "foo/bar/baz", Some("")); 251 | assert_diff_paths("foo/bar/baz", "foo/bar/baz/", Some("")); 252 | 253 | assert_diff_paths("foo/bar/baz/", "foo", Some("bar/baz")); 254 | assert_diff_paths("foo/bar/baz/", "foo/bar", Some("baz")); 255 | assert_diff_paths("foo/bar/baz/", "foo/bar/baz", Some("")); 256 | assert_diff_paths("foo/bar/baz/", "foo/bar/baz/", Some("")); 257 | 258 | assert_diff_paths("foo/bar/baz", "foo/", Some("bar/baz")); 259 | assert_diff_paths("foo/bar/baz", "foo/bar/", Some("baz")); 260 | assert_diff_paths("foo/bar/baz", "foo/bar/baz", Some("")); 261 | } 262 | 263 | #[test] 264 | fn test_current_directory() { 265 | assert_diff_paths(".", "foo", Some("../.")); 266 | assert_diff_paths("foo", ".", Some("foo")); 267 | assert_diff_paths("/foo", "/.", Some("foo")); 268 | 269 | assert_diff_paths("./foo/bar/baz", "foo", Some("bar/baz")); 270 | assert_diff_paths("foo/bar/baz", "./foo", Some("bar/baz")); 271 | assert_diff_paths("./foo/bar/baz", "./foo", Some("bar/baz")); 272 | } 273 | 274 | fn assert_diff_paths(path: &str, base: &str, expected: Option<&str>) { 275 | assert_eq!(diff_paths(path, base), expected.map(|s| s.into())); 276 | #[cfg(feature = "camino")] 277 | assert_eq!(diff_utf8_paths(path, base), expected.map(|s| s.into())); 278 | } 279 | } 280 | --------------------------------------------------------------------------------