Mercurial > hg
annotate rust/hg-core/src/utils/files.rs @ 43250:98d996a138de
rust-cross-platform: remove `unimplemented!` to get compile-time errors
We should get a compile-time error that there is missing functionality for the
targeted platform instead of the program breaking at runtime.
Differential Revision: https://phab.mercurial-scm.org/D7107
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Wed, 16 Oct 2019 17:16:23 +0300 |
parents | 7a01778bc7b7 |
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1 // files.rs |
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2 // |
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3 // Copyright 2019 |
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4 // Raphaël Gomès <rgomes@octobus.net>, |
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5 // Yuya Nishihara <yuya@tcha.org> |
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6 // |
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7 // This software may be used and distributed according to the terms of the |
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8 // GNU General Public License version 2 or any later version. |
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9 |
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10 //! Functions for fiddling with files. |
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11 |
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12 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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13 use std::iter::FusedIterator; |
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14 |
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15 use std::path::Path; |
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16 |
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17 pub fn get_path_from_bytes(bytes: &[u8]) -> &Path { |
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18 let os_str; |
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19 #[cfg(unix)] |
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20 { |
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21 use std::os::unix::ffi::OsStrExt; |
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22 os_str = std::ffi::OsStr::from_bytes(bytes); |
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23 } |
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24 // TODO Handle other platforms |
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25 // TODO: convert from WTF8 to Windows MBCS (ANSI encoding). |
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26 // Perhaps, the return type would have to be Result<PathBuf>. |
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27 |
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28 Path::new(os_str) |
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29 } |
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30 |
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31 /// An iterator over repository path yielding itself and its ancestors. |
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32 #[derive(Copy, Clone, Debug)] |
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33 pub struct Ancestors<'a> { |
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34 next: Option<&'a HgPath>, |
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35 } |
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36 |
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37 impl<'a> Iterator for Ancestors<'a> { |
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38 type Item = &'a HgPath; |
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39 |
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40 fn next(&mut self) -> Option<Self::Item> { |
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41 let next = self.next; |
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42 self.next = match self.next { |
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43 Some(s) if s.is_empty() => None, |
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44 Some(s) => { |
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45 let p = s.bytes().rposition(|c| *c == b'/').unwrap_or(0); |
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46 Some(HgPath::new(&s.as_bytes()[..p])) |
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47 } |
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48 None => None, |
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49 }; |
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50 next |
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51 } |
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52 } |
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53 |
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54 impl<'a> FusedIterator for Ancestors<'a> {} |
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55 |
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56 /// Returns an iterator yielding ancestor directories of the given repository |
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57 /// path. |
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58 /// |
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59 /// The path is separated by '/', and must not start with '/'. |
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60 /// |
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61 /// The path itself isn't included unless it is b"" (meaning the root |
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62 /// directory.) |
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63 pub fn find_dirs<'a>(path: &'a HgPath) -> Ancestors<'a> { |
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64 let mut dirs = Ancestors { next: Some(path) }; |
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65 if !path.is_empty() { |
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66 dirs.next(); // skip itself |
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67 } |
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68 dirs |
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69 } |
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70 |
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71 /// TODO more than ASCII? |
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72 pub fn normalize_case(path: &HgPath) -> HgPathBuf { |
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73 #[cfg(windows)] // NTFS compares via upper() |
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74 return path.to_ascii_uppercase(); |
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75 #[cfg(unix)] |
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76 path.to_ascii_lowercase() |
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77 } |
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78 |
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79 #[cfg(test)] |
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80 mod tests { |
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81 use super::*; |
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82 |
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83 #[test] |
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84 fn find_dirs_some() { |
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85 let mut dirs = super::find_dirs(HgPath::new(b"foo/bar/baz")); |
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86 assert_eq!(dirs.next(), Some(HgPath::new(b"foo/bar"))); |
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87 assert_eq!(dirs.next(), Some(HgPath::new(b"foo"))); |
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88 assert_eq!(dirs.next(), Some(HgPath::new(b""))); |
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89 assert_eq!(dirs.next(), None); |
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90 assert_eq!(dirs.next(), None); |
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91 } |
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92 |
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93 #[test] |
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94 fn find_dirs_empty() { |
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95 // looks weird, but mercurial.util.finddirs(b"") yields b"" |
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96 let mut dirs = super::find_dirs(HgPath::new(b"")); |
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97 assert_eq!(dirs.next(), Some(HgPath::new(b""))); |
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98 assert_eq!(dirs.next(), None); |
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99 assert_eq!(dirs.next(), None); |
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100 } |
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101 } |