drep-ai 3.0.0

A local commit gate: runs the linters your repo configures, and sends changed code to an LLM for review
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210

//! `staged_hunks` and `hunks_since`: criteria 14-18.

use std::fs;

use crate::diff::hunks::HunkLine;
use crate::diff::{hunks_since, staged_hunks};
use crate::files;

use super::support::{GitRepo, run_in};

#[tokio::test]
async fn staged_hunks_reports_a_real_line_number_for_a_modified_staged_file() {
    let repo = GitRepo::init().await;
    let root = repo.root();
    let path = root.join("feature.rs");

    fs::write(&path, "line 1\nline 2\nline 3\nline 4\nline 5\n").expect("write");
    run_in(root, &["add", "feature.rs"]).await;
    repo.commit_all("initial").await;

    fs::write(&path, "line 1\nline 2\nCHANGED\nline 4\nline 5\n").expect("write");
    run_in(root, &["add", "feature.rs"]).await;

    let hunks = staged_hunks(root, files::is_scan_target)
        .await
        .expect("staged_hunks");
    assert_eq!(hunks.len(), 1, "expected one hunk, got {hunks:?}");
    let h = &hunks[0];
    let line_3 = h
        .numbered_new_lines()
        .find(|(n, content)| *n == 3 && content.contains("CHANGED"))
        .expect("line 3 should appear with its real file line number");
    assert!(
        line_3.1.contains("CHANGED"),
        "the hunk should contain the new line text, got {h:?}"
    );
}

#[tokio::test]
async fn staged_hunks_works_on_a_repo_with_no_commits_yet() {
    // The empty-tree fallback: a fresh `git init` has no HEAD. Without
    // the fallback, this would error and the pre-commit install on a
    // brand new repo would block the user's first commit.
    let repo = GitRepo::init_no_commits().await;
    let root = repo.root();

    fs::write(root.join("first.rs"), "alpha\nbeta\ngamma\n").expect("write");
    run_in(root, &["add", "first.rs"]).await;

    let hunks = staged_hunks(root, files::is_scan_target)
        .await
        .expect("staged_hunks no-commits");
    assert_eq!(hunks.len(), 1, "expected one hunk, got {hunks:?}");
    assert_eq!(hunks[0].file_path.to_string_lossy(), "first.rs");
}

#[tokio::test]
async fn staged_hunks_returns_no_hunk_for_cargo_lock() {
    let repo = GitRepo::init().await;
    let root = repo.root();

    fs::write(root.join("Cargo.lock"), "before\n").expect("write");
    run_in(root, &["add", "Cargo.lock"]).await;
    repo.commit_all("seed Cargo.lock").await;
    fs::write(root.join("Cargo.lock"), "after\n").expect("write");
    run_in(root, &["add", "Cargo.lock"]).await;

    let hunks = staged_hunks(root, files::is_scan_target)
        .await
        .expect("staged_hunks");
    assert!(
        hunks.is_empty(),
        "Cargo.lock must be dropped by is_scan_target, got {hunks:?}"
    );
}

#[tokio::test]
async fn hunks_since_uses_three_dot_semantics_not_two_dot() {
    // The discriminating case. Same fork shape as the existing
    // `three_dot_excludes_base_modifications_that_two_dot_would_report`
    // test, but here we exercise the hunk form rather than the file-name
    // form. The base branch *modifies* a shared file, which a two-dot
    // diff reports as `M`, which `--diff-filter=ACMR` keeps. A two-dot
    // implementation would therefore return a hunk for `shared.rs` even
    // though this branch never touched it. We assert that no such hunk
    // appears.
    let repo = GitRepo::init().await;
    let root = repo.root();

    fs::write(root.join("shared.rs"), "v1\n").expect("write");
    run_in(root, &["add", "."]).await;
    repo.commit_all("seed").await;
    repo.create_branch("feature").await;

    repo.checkout("feature").await;
    fs::write(root.join("on_branch.rs"), "branch\n").expect("write");
    run_in(root, &["add", "on_branch.rs"]).await;
    repo.commit_all("feature change").await;

    repo.checkout("main").await;
    fs::write(root.join("shared.rs"), "v2\n").expect("write");
    run_in(root, &["add", "shared.rs"]).await;
    repo.commit_all("base modifies shared.rs after the fork")
        .await;

    repo.checkout("feature").await;

    let hunks = hunks_since(root, "main", files::is_scan_target)
        .await
        .expect("hunks_since");
    let names: Vec<String> = hunks
        .iter()
        .map(|h| h.file_path.to_string_lossy().into_owned())
        .collect();

    assert!(
        names.iter().any(|n| n.ends_with("on_branch.rs")),
        "the branch's own change must be reported, got {names:?}"
    );
    assert!(
        !names.iter().any(|n| n.ends_with("shared.rs")),
        "shared.rs was modified on the base, not by this branch - a two-dot \
         diff reports it as M and ACMR keeps it. got {names:?}"
    );
}

#[tokio::test]
async fn staged_hunks_requests_at_least_fifteen_context_lines() {
    // 40-line file, change at line 20. With --unified=20 the diff
    // reaches back to line 1; if `--unified` is missing (default 3)
    // the context before the change is far smaller. Counting Context
    // lines whose new-line number is below 20 hits at least 15 when
    // the context budget actually reached git.
    let repo = GitRepo::init().await;
    let root = repo.root();

    let mut body = String::new();
    for i in 1..=40 {
        body.push_str(&format!("line {i}\n"));
    }
    let path = root.join("wide.rs");
    fs::write(&path, &body).expect("write");
    run_in(root, &["add", "wide.rs"]).await;
    repo.commit_all("seed").await;

    let mutated = body.replacen("line 20\n", "CHANGED line 20\n", 1);
    fs::write(&path, &mutated).expect("write");
    run_in(root, &["add", "wide.rs"]).await;

    let hunks = staged_hunks(root, files::is_scan_target)
        .await
        .expect("staged_hunks");
    assert_eq!(hunks.len(), 1);
    let h = &hunks[0];
    let before_change: usize = h
        .lines
        .iter()
        .take_while(|l| match l {
            HunkLine::Context(s) => !s.contains("CHANGED"),
            _ => true,
        })
        .filter(|l| matches!(l, HunkLine::Context(_)))
        .count();
    assert!(
        before_change >= 15,
        "expected ≥15 context lines before the change (proving --unified=20), got {before_change}"
    );
}

/// `--diff` in a repo with no commits reports that plainly.
///
/// A three-dot spec is a symmetric difference between two *commits*; the empty
/// tree is not one, so the fallback that used to live here could never produce
/// a diff - it only turned "no commits yet" into git's opaque "Invalid
/// symmetric difference expression". The message now names the situation and
/// the way out.
///
/// The `--tip` half pins that an explicit tip is used verbatim rather than
/// being replaced by any fallback: without it, ignoring `tip` would pass.
#[tokio::test]
async fn hunks_between_reports_plainly_when_the_repo_has_no_commits() {
    let repo = GitRepo::init_no_commits().await;
    let root = repo.root();

    let err = crate::diff::hunks_between(root, EMPTY_TREE_SHA, None, files::is_scan_target)
        .await
        .expect_err("there is no HEAD to diff to");
    let rendered = format!("{err}");
    assert!(
        rendered.contains("no commits yet"),
        "the message must name the situation, got: {rendered}"
    );
    assert!(
        !rendered.contains("symmetric difference"),
        "and must not leak git's version of it, got: {rendered}"
    );

    // An explicit tip skips the HEAD probe entirely, so this fails inside git
    // rather than at the guard above.
    let err = crate::diff::hunks_between(root, EMPTY_TREE_SHA, Some("HEAD"), files::is_scan_target)
        .await
        .expect_err("HEAD is unborn");
    assert!(
        !format!("{err}").contains("no commits yet"),
        "an explicit tip is used verbatim, so the guard must not fire"
    );
}

/// The empty tree's well-known SHA, as git itself defines it.
const EMPTY_TREE_SHA: &str = "4b825dc642cb6eb9a060e54bf8d69288fbee4904";