File: reference.rs

package info (click to toggle)
rust-git2 0.13.11-2
  • links: PTS, VCS
  • area: main
  • in suites: bookworm, bullseye, sid
  • size: 1,076 kB
  • sloc: makefile: 6
file content (418 lines) | stat: -rw-r--r-- 13,798 bytes parent folder | download | duplicates (3)
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
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
use std::cmp::Ordering;
use std::ffi::CString;
use std::marker;
use std::mem;
use std::ptr;
use std::str;

use crate::object::CastOrPanic;
use crate::util::{c_cmp_to_ordering, Binding};
use crate::{
    raw, Blob, Commit, Error, Object, ObjectType, Oid, ReferenceType, Repository, Tag, Tree,
};

struct Refdb<'repo>(&'repo Repository);

/// A structure to represent a git [reference][1].
///
/// [1]: http://git-scm.com/book/en/Git-Internals-Git-References
pub struct Reference<'repo> {
    raw: *mut raw::git_reference,
    _marker: marker::PhantomData<Refdb<'repo>>,
}

/// An iterator over the references in a repository.
pub struct References<'repo> {
    raw: *mut raw::git_reference_iterator,
    _marker: marker::PhantomData<Refdb<'repo>>,
}

/// An iterator over the names of references in a repository.
pub struct ReferenceNames<'repo, 'references> {
    inner: &'references mut References<'repo>,
}

impl<'repo> Reference<'repo> {
    /// Ensure the reference name is well-formed.
    pub fn is_valid_name(refname: &str) -> bool {
        crate::init();
        let refname = CString::new(refname).unwrap();
        unsafe { raw::git_reference_is_valid_name(refname.as_ptr()) == 1 }
    }

    /// Get access to the underlying raw pointer.
    pub fn raw(&self) -> *mut raw::git_reference {
        self.raw
    }

    /// Delete an existing reference.
    ///
    /// This method works for both direct and symbolic references. The reference
    /// will be immediately removed on disk.
    ///
    /// This function will return an error if the reference has changed from the
    /// time it was looked up.
    pub fn delete(&mut self) -> Result<(), Error> {
        unsafe {
            try_call!(raw::git_reference_delete(self.raw));
        }
        Ok(())
    }

    /// Check if a reference is a local branch.
    pub fn is_branch(&self) -> bool {
        unsafe { raw::git_reference_is_branch(&*self.raw) == 1 }
    }

    /// Check if a reference is a note.
    pub fn is_note(&self) -> bool {
        unsafe { raw::git_reference_is_note(&*self.raw) == 1 }
    }

    /// Check if a reference is a remote tracking branch
    pub fn is_remote(&self) -> bool {
        unsafe { raw::git_reference_is_remote(&*self.raw) == 1 }
    }

    /// Check if a reference is a tag
    pub fn is_tag(&self) -> bool {
        unsafe { raw::git_reference_is_tag(&*self.raw) == 1 }
    }

    /// Get the reference type of a reference.
    ///
    /// If the type is unknown, then `None` is returned.
    pub fn kind(&self) -> Option<ReferenceType> {
        ReferenceType::from_raw(unsafe { raw::git_reference_type(&*self.raw) })
    }

    /// Get the full name of a reference.
    ///
    /// Returns `None` if the name is not valid utf-8.
    pub fn name(&self) -> Option<&str> {
        str::from_utf8(self.name_bytes()).ok()
    }

    /// Get the full name of a reference.
    pub fn name_bytes(&self) -> &[u8] {
        unsafe { crate::opt_bytes(self, raw::git_reference_name(&*self.raw)).unwrap() }
    }

    /// Get the full shorthand of a reference.
    ///
    /// This will transform the reference name into a name "human-readable"
    /// version. If no shortname is appropriate, it will return the full name.
    ///
    /// Returns `None` if the shorthand is not valid utf-8.
    pub fn shorthand(&self) -> Option<&str> {
        str::from_utf8(self.shorthand_bytes()).ok()
    }

    /// Get the full shorthand of a reference.
    pub fn shorthand_bytes(&self) -> &[u8] {
        unsafe { crate::opt_bytes(self, raw::git_reference_shorthand(&*self.raw)).unwrap() }
    }

    /// Get the OID pointed to by a direct reference.
    ///
    /// Only available if the reference is direct (i.e. an object id reference,
    /// not a symbolic one).
    pub fn target(&self) -> Option<Oid> {
        unsafe { Binding::from_raw_opt(raw::git_reference_target(&*self.raw)) }
    }

    /// Return the peeled OID target of this reference.
    ///
    /// This peeled OID only applies to direct references that point to a hard
    /// Tag object: it is the result of peeling such Tag.
    pub fn target_peel(&self) -> Option<Oid> {
        unsafe { Binding::from_raw_opt(raw::git_reference_target_peel(&*self.raw)) }
    }

    /// Get full name to the reference pointed to by a symbolic reference.
    ///
    /// May return `None` if the reference is either not symbolic or not a
    /// valid utf-8 string.
    pub fn symbolic_target(&self) -> Option<&str> {
        self.symbolic_target_bytes()
            .and_then(|s| str::from_utf8(s).ok())
    }

    /// Get full name to the reference pointed to by a symbolic reference.
    ///
    /// Only available if the reference is symbolic.
    pub fn symbolic_target_bytes(&self) -> Option<&[u8]> {
        unsafe { crate::opt_bytes(self, raw::git_reference_symbolic_target(&*self.raw)) }
    }

    /// Resolve a symbolic reference to a direct reference.
    ///
    /// This method iteratively peels a symbolic reference until it resolves to
    /// a direct reference to an OID.
    ///
    /// If a direct reference is passed as an argument, a copy of that
    /// reference is returned.
    pub fn resolve(&self) -> Result<Reference<'repo>, Error> {
        let mut raw = ptr::null_mut();
        unsafe {
            try_call!(raw::git_reference_resolve(&mut raw, &*self.raw));
            Ok(Binding::from_raw(raw))
        }
    }

    /// Peel a reference to an object
    ///
    /// This method recursively peels the reference until it reaches
    /// an object of the specified type.
    pub fn peel(&self, kind: ObjectType) -> Result<Object<'repo>, Error> {
        let mut raw = ptr::null_mut();
        unsafe {
            try_call!(raw::git_reference_peel(&mut raw, self.raw, kind));
            Ok(Binding::from_raw(raw))
        }
    }

    /// Peel a reference to a blob
    ///
    /// This method recursively peels the reference until it reaches
    /// a blob.
    pub fn peel_to_blob(&self) -> Result<Blob<'repo>, Error> {
        Ok(self.peel(ObjectType::Blob)?.cast_or_panic(ObjectType::Blob))
    }

    /// Peel a reference to a commit
    ///
    /// This method recursively peels the reference until it reaches
    /// a commit.
    pub fn peel_to_commit(&self) -> Result<Commit<'repo>, Error> {
        Ok(self
            .peel(ObjectType::Commit)?
            .cast_or_panic(ObjectType::Commit))
    }

    /// Peel a reference to a tree
    ///
    /// This method recursively peels the reference until it reaches
    /// a tree.
    pub fn peel_to_tree(&self) -> Result<Tree<'repo>, Error> {
        Ok(self.peel(ObjectType::Tree)?.cast_or_panic(ObjectType::Tree))
    }

    /// Peel a reference to a tag
    ///
    /// This method recursively peels the reference until it reaches
    /// a tag.
    pub fn peel_to_tag(&self) -> Result<Tag<'repo>, Error> {
        Ok(self.peel(ObjectType::Tag)?.cast_or_panic(ObjectType::Tag))
    }

    /// Rename an existing reference.
    ///
    /// This method works for both direct and symbolic references.
    ///
    /// If the force flag is not enabled, and there's already a reference with
    /// the given name, the renaming will fail.
    pub fn rename(
        &mut self,
        new_name: &str,
        force: bool,
        msg: &str,
    ) -> Result<Reference<'repo>, Error> {
        let mut raw = ptr::null_mut();
        let new_name = CString::new(new_name)?;
        let msg = CString::new(msg)?;
        unsafe {
            try_call!(raw::git_reference_rename(
                &mut raw, self.raw, new_name, force, msg
            ));
            Ok(Binding::from_raw(raw))
        }
    }

    /// Conditionally create a new reference with the same name as the given
    /// reference but a different OID target. The reference must be a direct
    /// reference, otherwise this will fail.
    ///
    /// The new reference will be written to disk, overwriting the given
    /// reference.
    pub fn set_target(&mut self, id: Oid, reflog_msg: &str) -> Result<Reference<'repo>, Error> {
        let mut raw = ptr::null_mut();
        let msg = CString::new(reflog_msg)?;
        unsafe {
            try_call!(raw::git_reference_set_target(
                &mut raw,
                self.raw,
                id.raw(),
                msg
            ));
            Ok(Binding::from_raw(raw))
        }
    }
}

impl<'repo> PartialOrd for Reference<'repo> {
    fn partial_cmp(&self, other: &Reference<'repo>) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl<'repo> Ord for Reference<'repo> {
    fn cmp(&self, other: &Reference<'repo>) -> Ordering {
        c_cmp_to_ordering(unsafe { raw::git_reference_cmp(&*self.raw, &*other.raw) })
    }
}

impl<'repo> PartialEq for Reference<'repo> {
    fn eq(&self, other: &Reference<'repo>) -> bool {
        self.cmp(other) == Ordering::Equal
    }
}

impl<'repo> Eq for Reference<'repo> {}

impl<'repo> Binding for Reference<'repo> {
    type Raw = *mut raw::git_reference;
    unsafe fn from_raw(raw: *mut raw::git_reference) -> Reference<'repo> {
        Reference {
            raw: raw,
            _marker: marker::PhantomData,
        }
    }
    fn raw(&self) -> *mut raw::git_reference {
        self.raw
    }
}

impl<'repo> Drop for Reference<'repo> {
    fn drop(&mut self) {
        unsafe { raw::git_reference_free(self.raw) }
    }
}

impl<'repo> References<'repo> {
    /// Consumes a `References` iterator to create an iterator over just the
    /// name of some references.
    ///
    /// This is more efficient if only the names are desired of references as
    /// the references themselves don't have to be allocated and deallocated.
    ///
    /// The returned iterator will yield strings as opposed to a `Reference`.
    pub fn names<'a>(&'a mut self) -> ReferenceNames<'repo, 'a> {
        ReferenceNames { inner: self }
    }
}

impl<'repo> Binding for References<'repo> {
    type Raw = *mut raw::git_reference_iterator;
    unsafe fn from_raw(raw: *mut raw::git_reference_iterator) -> References<'repo> {
        References {
            raw: raw,
            _marker: marker::PhantomData,
        }
    }
    fn raw(&self) -> *mut raw::git_reference_iterator {
        self.raw
    }
}

impl<'repo> Iterator for References<'repo> {
    type Item = Result<Reference<'repo>, Error>;
    fn next(&mut self) -> Option<Result<Reference<'repo>, Error>> {
        let mut out = ptr::null_mut();
        unsafe {
            try_call_iter!(raw::git_reference_next(&mut out, self.raw));
            Some(Ok(Binding::from_raw(out)))
        }
    }
}

impl<'repo> Drop for References<'repo> {
    fn drop(&mut self) {
        unsafe { raw::git_reference_iterator_free(self.raw) }
    }
}

impl<'repo, 'references> Iterator for ReferenceNames<'repo, 'references> {
    type Item = Result<&'references str, Error>;
    fn next(&mut self) -> Option<Result<&'references str, Error>> {
        let mut out = ptr::null();
        unsafe {
            try_call_iter!(raw::git_reference_next_name(&mut out, self.inner.raw));
            let bytes = crate::opt_bytes(self, out).unwrap();
            let s = str::from_utf8(bytes).unwrap();
            Some(Ok(mem::transmute::<&str, &'references str>(s)))
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::{ObjectType, Reference, ReferenceType};

    #[test]
    fn smoke() {
        assert!(Reference::is_valid_name("refs/foo"));
        assert!(!Reference::is_valid_name("foo"));
    }

    #[test]
    fn smoke2() {
        let (_td, repo) = crate::test::repo_init();
        let mut head = repo.head().unwrap();
        assert!(head.is_branch());
        assert!(!head.is_remote());
        assert!(!head.is_tag());
        assert!(!head.is_note());

        // HEAD is a symbolic reference but git_repository_head resolves it
        // so it is a GIT_REFERENCE_DIRECT.
        assert_eq!(head.kind().unwrap(), ReferenceType::Direct);

        assert!(head == repo.head().unwrap());
        assert_eq!(head.name(), Some("refs/heads/master"));

        assert!(head == repo.find_reference("refs/heads/master").unwrap());
        assert_eq!(
            repo.refname_to_id("refs/heads/master").unwrap(),
            head.target().unwrap()
        );

        assert!(head.symbolic_target().is_none());
        assert!(head.target_peel().is_none());

        assert_eq!(head.shorthand(), Some("master"));
        assert!(head.resolve().unwrap() == head);

        let mut tag1 = repo
            .reference("refs/tags/tag1", head.target().unwrap(), false, "test")
            .unwrap();
        assert!(tag1.is_tag());
        assert_eq!(tag1.kind().unwrap(), ReferenceType::Direct);

        let peeled_commit = tag1.peel(ObjectType::Commit).unwrap();
        assert_eq!(ObjectType::Commit, peeled_commit.kind().unwrap());
        assert_eq!(tag1.target().unwrap(), peeled_commit.id());

        tag1.delete().unwrap();

        let mut sym1 = repo
            .reference_symbolic("refs/tags/tag1", "refs/heads/master", false, "test")
            .unwrap();
        assert_eq!(sym1.kind().unwrap(), ReferenceType::Symbolic);
        sym1.delete().unwrap();

        {
            assert!(repo.references().unwrap().count() == 1);
            assert!(repo.references().unwrap().next().unwrap().unwrap() == head);
            let mut names = repo.references().unwrap();
            let mut names = names.names();
            assert_eq!(names.next().unwrap().unwrap(), "refs/heads/master");
            assert!(names.next().is_none());
            assert!(repo.references_glob("foo").unwrap().count() == 0);
            assert!(repo.references_glob("refs/heads/*").unwrap().count() == 1);
        }

        let mut head = head.rename("refs/foo", true, "test").unwrap();
        head.delete().unwrap();
    }
}