tcup 0.1.2

The one and only teacup client!
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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270

use std::{cell::Cell, path::Path, str::FromStr};

use git2::{Diff, Repository, Sort};
use serde::Serialize;

use crate::errors::TeacupError;

#[derive(Serialize, Clone, Debug)]
struct FileChange {
    path: String,
    lines_added: u32,
    lines_removed: u32,
    lines_modified: u32,
    hunks_added: u32,
    hunks_removed: u32,
    hunks_modified: u32,
}

#[derive(Serialize, Debug, Clone)]
pub enum CommitType {
    Normal,
    Merge,
}

#[derive(Serialize, Debug)]
struct Commit {
    id: String,
    parents: Vec<String>,
    repo_url: String,
    timestamp: i64,
    author_name: String,
    author_email: String,
    message: String,
    r#type: CommitType,
    changes: Vec<FileChange>,
}

#[derive(Serialize, Debug)]
pub struct FlatCommit {
    id: String,
    parents: Vec<String>,
    repo_url: String,
    timestamp: i64,
    author_name: String,
    author_email: String,
    message: String,
    r#type: CommitType,
    path: String,
    lines_added: u32,
    lines_removed: u32,
    lines_modified: u32,
    hunks_added: u32,
    hunks_removed: u32,
    hunks_modified: u32,
}

impl From<git2::Error> for TeacupError {
    fn from(err: git2::Error) -> Self {
        TeacupError::GitError(err.to_string())
    }
}

fn extract_from_diff(diff: &Diff) -> Result<Vec<FileChange>, TeacupError> {
    // diff.foreach works in a very imperative way, looping through the diffs
    // and calling callbacks in serial until it's complete
    //
    let mut files: Vec<FileChange> = Vec::new();

    // Using a cell so we can modify the captured FileChange via the multiple closures below
    // without ownership issues
    //
    let x: Cell<Option<FileChange>> = Cell::new(None);

    diff.foreach(
        &mut |diff_delta, _s| {
            match x.take() {
                // If we're currently busy with a file, this means we're moving on so we
                // should push it and replace it with the new one
                //
                Some(file_change) => {
                    files.push(file_change);
                }
                _ => {}
            }
            let filename = diff_delta.new_file().path().unwrap().to_str().unwrap();

            x.set(Some(FileChange {
                path: String::from_str(filename).unwrap(),
                lines_added: 0,
                lines_removed: 0,
                lines_modified: 0,
                hunks_added: 0,
                hunks_removed: 0,
                hunks_modified: 0,
            }));
            true
        },
        None,
        Some(&mut |_diff_delta, diff_hunk| {
            // Guaranteed to be processing a file (big assumption?)
            //
            let state = x.take().unwrap();
            let updated = match (diff_hunk.old_lines(), diff_hunk.new_lines()) {
                (0, _) => FileChange {
                    hunks_added: state.hunks_added + 1,
                    ..state
                },
                (_, 0) => FileChange {
                    hunks_removed: state.hunks_removed + 1,
                    ..state
                },
                (_, _) => FileChange {
                    hunks_modified: state.hunks_modified + 1,
                    ..state
                },
            };
            x.set(Some(updated));
            true
        }),
        Some(&mut |_diff_delta, _diff_hunk, diff_line| {
            // Guaranteed to be processing a file (big assumption?)
            //
            let state = x.take().unwrap();
            let updated = match (diff_line.old_lineno(), diff_line.new_lineno()) {
                (None, Some(_)) => FileChange {
                    lines_added: state.lines_added + 1,
                    ..state
                },
                (Some(_), None) => FileChange {
                    lines_removed: state.lines_removed + 1,
                    ..state
                },
                (Some(_), Some(_)) => FileChange {
                    lines_modified: state.lines_modified + 1,
                    ..state
                },
                // Both being None is weird... don't think possible?
                _ => state,
            };
            x.set(Some(updated));
            true
        }),
    )?;

    Ok(files)
}

pub fn extract_logs(repo_location: String) -> Result<Vec<FlatCommit>, TeacupError> {
    let repo = Repository::open(repo_location.clone())?;

    // Create the revwalk
    //
    let mut revwalk = repo.revwalk()?;
    revwalk.set_sorting(Sort::TIME)?;
    // eprintln!("Adding head");
    revwalk.push_head()?;

    // Add all branches to the revwalk
    //
    let branches = repo.branches(None)?;
    for branch_r in branches {
        if let Ok((branch, _branch_type)) = branch_r {
            if !branch.is_head() {
                // eprintln!(
                //     "Adding branch => {} {:?}",
                //     branch.name()?.unwrap_or("unnamed"),
                //     branch_type
                // );
                if let Some(target) = branch.get().target() {
                    revwalk.push(target)?;
                } else {
                    // eprintln!("No valid oid...");
                }
            }
        }
    }

    let mut result: Vec<FlatCommit> = vec![];
    while let Some(Ok(oid)) = revwalk.next() {
        let commit = repo.find_commit(oid)?;
        let commit_tree = repo.find_tree(commit.tree_id()).unwrap();

        // println!(
        //     "Oid => {}, Author => {} {}, Message => {}",
        //     oid,
        //     author.name().unwrap_or("unknown"),
        //     author.email().unwrap_or("unknown"),
        //     commit.message().unwrap_or("unknown")
        // );

        // ignore any commits which have more than 1 parent (i.e. a merge)
        //
        let parent_commit = if commit.parent_count() == 0 {
            // Its the origin commit (the seed of the tree)
            //
            None
        } else {
            Some(commit.parent(0).unwrap().tree_id())
        };

        let parent_tree = parent_commit.map(|oid| repo.find_tree(oid).unwrap());

        let default_commit = Commit {
            id: oid.to_string(),
            parents: commit.parents().map(|p| p.id().to_string()).collect(),
            r#type: CommitType::Normal,
            repo_url: repo_location.to_string(),
            timestamp: commit.time().seconds(),
            author_name: commit.author().name().unwrap_or("unknown").to_string(),
            author_email: commit.author().email().unwrap_or("unknown").to_string(),
            message: commit.message().unwrap_or("unknown").to_string(),
            changes: Vec::new(),
        };

        // If it's a merge type (multiple parents), then we ignore the file changes
        //
        let my_commit = if commit.parent_count() > 1 {
            Commit {
                r#type: CommitType::Merge,
                ..default_commit
            }
        }
        // If it's a normal single (or zero) parent commit, then we process the diff
        // to the parent to grab file changes
        //
        else {
            let diff = repo.diff_tree_to_tree(parent_tree.as_ref(), Some(&commit_tree), None)?;
            let file_changes = extract_from_diff(&diff)?;
            Commit {
                r#type: CommitType::Normal,
                changes: file_changes,
                ..default_commit
            }
        };

        // Flatten and accumulate
        //
        let flats: Vec<FlatCommit> = my_commit
            .changes
            .iter()
            .map(|change| FlatCommit {
                id: my_commit.id.clone(),
                parents: my_commit.parents.clone(),
                r#type: my_commit.r#type.clone(),
                repo_url: my_commit.repo_url.clone(),
                timestamp: my_commit.timestamp.clone(),
                author_name: my_commit.author_name.clone(),
                author_email: my_commit.author_email.clone(),
                message: my_commit.message.clone(),
                path: change.path.clone(),
                lines_added: change.lines_added.clone(),
                lines_removed: change.lines_removed.clone(),
                lines_modified: change.lines_modified.clone(),
                hunks_added: change.hunks_added.clone(),
                hunks_removed: change.hunks_removed.clone(),
                hunks_modified: change.hunks_modified.clone(),
            })
            .collect();

        for flat in flats {
            result.push(flat);
        }
    }

    Ok(result)
}

pub fn is_git_repo(location: &String) -> bool {
    Path::new(location).exists() && Repository::open(location).is_ok()
}