git.iko.soy/bat
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bat/src/diff.rs
76 lines 2.4 kB history raw
1use git2::{DiffOptions, IntoCString, Repository};
2use std::collections::HashMap;
3use std::fs;
4use std::path::Path;
6#[derive(Copy, Clone, Debug)]
7pub enum LineChange {
8 Added,
9 RemovedAbove,
10 RemovedBelow,
11 Modified,
14pub type LineChanges = HashMap<u32, LineChange>;
16pub fn get_git_diff(filename: &str) -> Option<LineChanges> {
17 let repo = Repository::discover(&filename).ok()?;
18 let path_absolute = fs::canonicalize(&filename).ok()?;
19 let path_relative_to_repo = path_absolute.strip_prefix(repo.workdir()?).ok()?;
21 let mut diff_options = DiffOptions::new();
22 let pathspec = path_relative_to_repo.into_c_string().ok()?;
23 diff_options.pathspec(pathspec);
24 diff_options.context_lines(0);
26 let diff = repo.diff_index_to_workdir(None, Some(&mut diff_options))
27 .ok()?;
29 let mut line_changes: LineChanges = HashMap::new();
31 let mark_section =
32 |line_changes: &mut LineChanges, start: u32, end: i32, change: LineChange| {
33 for line in start..(end + 1) as u32 {
34 line_changes.insert(line, change);
35 }
36 };
38 let _ = diff.foreach(
39 &mut |_, _| true,
40 None,
41 Some(&mut |delta, hunk| {
42 let path = delta.new_file().path().unwrap_or_else(|| Path::new(""));
44 if path_relative_to_repo != path {
45 return false;
46 }
48 let old_lines = hunk.old_lines();
49 let new_start = hunk.new_start();
50 let new_lines = hunk.new_lines();
51 let new_end = (new_start + new_lines) as i32 - 1;
53 if old_lines == 0 && new_lines > 0 {
54 mark_section(&mut line_changes, new_start, new_end, LineChange::Added);
55 } else if new_lines == 0 && old_lines > 0 {
56 if new_start == 0 {
57 mark_section(&mut line_changes, 1, 1, LineChange::RemovedAbove);
58 } else {
59 mark_section(
60 &mut line_changes,
61 new_start,
62 new_start as i32,
63 LineChange::RemovedBelow,
64 );
65 }
66 } else {
67 mark_section(&mut line_changes, new_start, new_end, LineChange::Modified);
68 }
70 true
71 }),
72 None,
73 );
75 Some(line_changes)