git.iko.soy/bat
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bat/src/diff.rs
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1#![cfg(feature = "git")]
3use std::collections::HashMap;
4use std::ffi::OsStr;
5use std::fs;
6use std::path::Path;
8use git2::{DiffOptions, IntoCString, Repository};
10#[derive(Copy, Clone, Debug)]
11pub enum LineChange {
12 Added,
13 RemovedAbove,
14 RemovedBelow,
15 Modified,
18pub type LineChanges = HashMap<u32, LineChange>;
20pub fn get_git_diff(filename: &OsStr) -> Option<LineChanges> {
21 let repo = Repository::discover(&filename).ok()?;
23 let repo_path_absolute = fs::canonicalize(repo.workdir()?).ok()?;
25 let filepath_absolute = fs::canonicalize(&filename).ok()?;
26 let filepath_relative_to_repo = filepath_absolute.strip_prefix(&repo_path_absolute).ok()?;
28 let mut diff_options = DiffOptions::new();
29 let pathspec = filepath_relative_to_repo.into_c_string().ok()?;
30 diff_options.pathspec(pathspec);
31 diff_options.context_lines(0);
33 let diff = repo
34 .diff_index_to_workdir(None, Some(&mut diff_options))
35 .ok()?;
37 let mut line_changes: LineChanges = HashMap::new();
39 let mark_section =
40 |line_changes: &mut LineChanges, start: u32, end: i32, change: LineChange| {
41 for line in start..=end as u32 {
42 line_changes.insert(line, change);
43 }
44 };
46 let _ = diff.foreach(
47 &mut |_, _| true,
48 None,
49 Some(&mut |delta, hunk| {
50 let path = delta.new_file().path().unwrap_or_else(|| Path::new(""));
52 if filepath_relative_to_repo != path {
53 return false;
54 }
56 let old_lines = hunk.old_lines();
57 let new_start = hunk.new_start();
58 let new_lines = hunk.new_lines();
59 let new_end = (new_start + new_lines) as i32 - 1;
61 if old_lines == 0 && new_lines > 0 {
62 mark_section(&mut line_changes, new_start, new_end, LineChange::Added);
63 } else if new_lines == 0 && old_lines > 0 {
64 if new_start == 0 {
65 mark_section(&mut line_changes, 1, 1, LineChange::RemovedAbove);
66 } else {
67 mark_section(
68 &mut line_changes,
69 new_start,
70 new_start as i32,
71 LineChange::RemovedBelow,
72 );
73 }
74 } else {
75 mark_section(&mut line_changes, new_start, new_end, LineChange::Modified);
76 }
78 true
79 }),
80 None,
81 );
83 Some(line_changes)