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
use libc::c_uint;
use std::ffi::CString;
use std::marker;

use crate::util::Binding;
use crate::{raw, Error, Oid, Repository, Sort};

/// A revwalk allows traversal of the commit graph defined by including one or
/// more leaves and excluding one or more roots.
pub struct Revwalk<'repo> {
    raw: *mut raw::git_revwalk,
    _marker: marker::PhantomData<&'repo Repository>,
}

impl<'repo> Revwalk<'repo> {
    /// Reset a revwalk to allow re-configuring it.
    ///
    /// The revwalk is automatically reset when iteration of its commits
    /// completes.
    pub fn reset(&mut self) {
        unsafe { raw::git_revwalk_reset(self.raw()) }
    }

    /// Set the order in which commits are visited.
    pub fn set_sorting(&mut self, sort_mode: Sort) {
        unsafe { raw::git_revwalk_sorting(self.raw(), sort_mode.bits() as c_uint) }
    }

    /// Simplify the history by first-parent
    ///
    /// No parents other than the first for each commit will be enqueued.
    pub fn simplify_first_parent(&mut self) {
        unsafe { raw::git_revwalk_simplify_first_parent(self.raw) }
    }

    /// Mark a commit to start traversal from.
    ///
    /// The given OID must belong to a committish on the walked repository.
    ///
    /// The given commit will be used as one of the roots when starting the
    /// revision walk. At least one commit must be pushed onto the walker before
    /// a walk can be started.
    pub fn push(&mut self, oid: Oid) -> Result<(), Error> {
        unsafe {
            try_call!(raw::git_revwalk_push(self.raw(), oid.raw()));
        }
        Ok(())
    }

    /// Push the repository's HEAD
    ///
    /// For more information, see `push`.
    pub fn push_head(&mut self) -> Result<(), Error> {
        unsafe {
            try_call!(raw::git_revwalk_push_head(self.raw()));
        }
        Ok(())
    }

    /// Push matching references
    ///
    /// The OIDs pointed to by the references that match the given glob pattern
    /// will be pushed to the revision walker.
    ///
    /// A leading 'refs/' is implied if not present as well as a trailing `/ \
    /// *` if the glob lacks '?', ' \ *' or '['.
    ///
    /// Any references matching this glob which do not point to a committish
    /// will be ignored.
    pub fn push_glob(&mut self, glob: &str) -> Result<(), Error> {
        let glob = CString::new(glob)?;
        unsafe {
            try_call!(raw::git_revwalk_push_glob(self.raw, glob));
        }
        Ok(())
    }

    /// Push and hide the respective endpoints of the given range.
    ///
    /// The range should be of the form `<commit>..<commit>` where each
    /// `<commit>` is in the form accepted by `revparse_single`. The left-hand
    /// commit will be hidden and the right-hand commit pushed.
    pub fn push_range(&mut self, range: &str) -> Result<(), Error> {
        let range = CString::new(range)?;
        unsafe {
            try_call!(raw::git_revwalk_push_range(self.raw, range));
        }
        Ok(())
    }

    /// Push the OID pointed to by a reference
    ///
    /// The reference must point to a committish.
    pub fn push_ref(&mut self, reference: &str) -> Result<(), Error> {
        let reference = CString::new(reference)?;
        unsafe {
            try_call!(raw::git_revwalk_push_ref(self.raw, reference));
        }
        Ok(())
    }

    /// Mark a commit as not of interest to this revwalk.
    pub fn hide(&mut self, oid: Oid) -> Result<(), Error> {
        unsafe {
            try_call!(raw::git_revwalk_hide(self.raw(), oid.raw()));
        }
        Ok(())
    }

    /// Hide the repository's HEAD
    ///
    /// For more information, see `hide`.
    pub fn hide_head(&mut self) -> Result<(), Error> {
        unsafe {
            try_call!(raw::git_revwalk_hide_head(self.raw()));
        }
        Ok(())
    }

    /// Hide matching references.
    ///
    /// The OIDs pointed to by the references that match the given glob pattern
    /// and their ancestors will be hidden from the output on the revision walk.
    ///
    /// A leading 'refs/' is implied if not present as well as a trailing `/ \
    /// *` if the glob lacks '?', ' \ *' or '['.
    ///
    /// Any references matching this glob which do not point to a committish
    /// will be ignored.
    pub fn hide_glob(&mut self, glob: &str) -> Result<(), Error> {
        let glob = CString::new(glob)?;
        unsafe {
            try_call!(raw::git_revwalk_hide_glob(self.raw, glob));
        }
        Ok(())
    }

    /// Hide the OID pointed to by a reference.
    ///
    /// The reference must point to a committish.
    pub fn hide_ref(&mut self, reference: &str) -> Result<(), Error> {
        let reference = CString::new(reference)?;
        unsafe {
            try_call!(raw::git_revwalk_hide_ref(self.raw, reference));
        }
        Ok(())
    }
}

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

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

impl<'repo> Iterator for Revwalk<'repo> {
    type Item = Result<Oid, Error>;
    fn next(&mut self) -> Option<Result<Oid, Error>> {
        let mut out: raw::git_oid = raw::git_oid {
            id: [0; raw::GIT_OID_RAWSZ],
        };
        unsafe {
            try_call_iter!(raw::git_revwalk_next(&mut out, self.raw()));
            Some(Ok(Binding::from_raw(&out as *const _)))
        }
    }
}

#[cfg(test)]
mod tests {
    #[test]
    fn smoke() {
        let (_td, repo) = crate::test::repo_init();
        let head = repo.head().unwrap();
        let target = head.target().unwrap();

        let mut walk = repo.revwalk().unwrap();
        walk.push(target).unwrap();

        let oids: Vec<crate::Oid> = walk.by_ref().collect::<Result<Vec<_>, _>>().unwrap();

        assert_eq!(oids.len(), 1);
        assert_eq!(oids[0], target);

        walk.reset();
        walk.push_head().unwrap();
        assert_eq!(walk.by_ref().count(), 1);

        walk.reset();
        walk.push_head().unwrap();
        walk.hide_head().unwrap();
        assert_eq!(walk.by_ref().count(), 0);
    }
}