1 files changed, 194 insertions, 0 deletions
diff --git a/extra/git2/src/merge.rs b/extra/git2/src/merge.rs
new file mode 100644
index 000000000..6bd30c10d
--- /dev/null
+++ b/extra/git2/src/merge.rs
@@ -0,0 +1,194 @@
+use libc::c_uint;
+use std::marker;
+use std::mem;
+use std::str;
+
+use crate::call::Convert;
+use crate::util::Binding;
+use crate::{raw, Commit, FileFavor, Oid};
+
+/// A structure to represent an annotated commit, the input to merge and rebase.
+///
+/// An annotated commit contains information about how it was looked up, which
+/// may be useful for functions like merge or rebase to provide context to the
+/// operation.
+pub struct AnnotatedCommit<'repo> {
+    raw: *mut raw::git_annotated_commit,
+    _marker: marker::PhantomData<Commit<'repo>>,
+}
+
+/// Options to specify when merging.
+pub struct MergeOptions {
+    raw: raw::git_merge_options,
+}
+
+impl<'repo> AnnotatedCommit<'repo> {
+    /// Gets the commit ID that the given git_annotated_commit refers to
+    pub fn id(&self) -> Oid {
+        unsafe { Binding::from_raw(raw::git_annotated_commit_id(self.raw)) }
+    }
+
+    /// Get the refname that the given git_annotated_commit refers to
+    ///
+    /// Returns None if it is not valid utf8
+    pub fn refname(&self) -> Option<&str> {
+        str::from_utf8(self.refname_bytes()).ok()
+    }
+
+    /// Get the refname that the given git_annotated_commit refers to.
+    pub fn refname_bytes(&self) -> &[u8] {
+        unsafe { crate::opt_bytes(self, raw::git_annotated_commit_ref(&*self.raw)).unwrap() }
+    }
+}
+
+impl Default for MergeOptions {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl MergeOptions {
+    /// Creates a default set of merge options.
+    pub fn new() -> MergeOptions {
+        let mut opts = MergeOptions {
+            raw: unsafe { mem::zeroed() },
+        };
+        assert_eq!(unsafe { raw::git_merge_init_options(&mut opts.raw, 1) }, 0);
+        opts
+    }
+
+    fn flag(&mut self, opt: u32, val: bool) -> &mut MergeOptions {
+        if val {
+            self.raw.flags |= opt;
+        } else {
+            self.raw.flags &= !opt;
+        }
+        self
+    }
+
+    /// Detect file renames
+    pub fn find_renames(&mut self, find: bool) -> &mut MergeOptions {
+        self.flag(raw::GIT_MERGE_FIND_RENAMES as u32, find)
+    }
+
+    /// If a conflict occurs, exit immediately instead of attempting to continue
+    /// resolving conflicts
+    pub fn fail_on_conflict(&mut self, fail: bool) -> &mut MergeOptions {
+        self.flag(raw::GIT_MERGE_FAIL_ON_CONFLICT as u32, fail)
+    }
+
+    /// Do not write the REUC extension on the generated index
+    pub fn skip_reuc(&mut self, skip: bool) -> &mut MergeOptions {
+        self.flag(raw::GIT_MERGE_FAIL_ON_CONFLICT as u32, skip)
+    }
+
+    /// If the commits being merged have multiple merge bases, do not build a
+    /// recursive merge base (by merging the multiple merge bases), instead
+    /// simply use the first base.
+    pub fn no_recursive(&mut self, disable: bool) -> &mut MergeOptions {
+        self.flag(raw::GIT_MERGE_NO_RECURSIVE as u32, disable)
+    }
+
+    /// Similarity to consider a file renamed (default 50)
+    pub fn rename_threshold(&mut self, thresh: u32) -> &mut MergeOptions {
+        self.raw.rename_threshold = thresh;
+        self
+    }
+
+    ///  Maximum similarity sources to examine for renames (default 200).
+    /// If the number of rename candidates (add / delete pairs) is greater
+    /// than this value, inexact rename detection is aborted. This setting
+    /// overrides the `merge.renameLimit` configuration value.
+    pub fn target_limit(&mut self, limit: u32) -> &mut MergeOptions {
+        self.raw.target_limit = limit as c_uint;
+        self
+    }
+
+    /// Maximum number of times to merge common ancestors to build a
+    /// virtual merge base when faced with criss-cross merges.  When
+    /// this limit is reached, the next ancestor will simply be used
+    /// instead of attempting to merge it.  The default is unlimited.
+    pub fn recursion_limit(&mut self, limit: u32) -> &mut MergeOptions {
+        self.raw.recursion_limit = limit as c_uint;
+        self
+    }
+
+    /// Specify a side to favor for resolving conflicts
+    pub fn file_favor(&mut self, favor: FileFavor) -> &mut MergeOptions {
+        self.raw.file_favor = favor.convert();
+        self
+    }
+
+    fn file_flag(&mut self, opt: u32, val: bool) -> &mut MergeOptions {
+        if val {
+            self.raw.file_flags |= opt;
+        } else {
+            self.raw.file_flags &= !opt;
+        }
+        self
+    }
+
+    /// Create standard conflicted merge files
+    pub fn standard_style(&mut self, standard: bool) -> &mut MergeOptions {
+        self.file_flag(raw::GIT_MERGE_FILE_STYLE_MERGE as u32, standard)
+    }
+
+    /// Create diff3-style file
+    pub fn diff3_style(&mut self, diff3: bool) -> &mut MergeOptions {
+        self.file_flag(raw::GIT_MERGE_FILE_STYLE_DIFF3 as u32, diff3)
+    }
+
+    /// Condense non-alphanumeric regions for simplified diff file
+    pub fn simplify_alnum(&mut self, simplify: bool) -> &mut MergeOptions {
+        self.file_flag(raw::GIT_MERGE_FILE_SIMPLIFY_ALNUM as u32, simplify)
+    }
+
+    /// Ignore all whitespace
+    pub fn ignore_whitespace(&mut self, ignore: bool) -> &mut MergeOptions {
+        self.file_flag(raw::GIT_MERGE_FILE_IGNORE_WHITESPACE as u32, ignore)
+    }
+
+    /// Ignore changes in amount of whitespace
+    pub fn ignore_whitespace_change(&mut self, ignore: bool) -> &mut MergeOptions {
+        self.file_flag(raw::GIT_MERGE_FILE_IGNORE_WHITESPACE_CHANGE as u32, ignore)
+    }
+
+    /// Ignore whitespace at end of line
+    pub fn ignore_whitespace_eol(&mut self, ignore: bool) -> &mut MergeOptions {
+        self.file_flag(raw::GIT_MERGE_FILE_IGNORE_WHITESPACE_EOL as u32, ignore)
+    }
+
+    /// Use the "patience diff" algorithm
+    pub fn patience(&mut self, patience: bool) -> &mut MergeOptions {
+        self.file_flag(raw::GIT_MERGE_FILE_DIFF_PATIENCE as u32, patience)
+    }
+
+    /// Take extra time to find minimal diff
+    pub fn minimal(&mut self, minimal: bool) -> &mut MergeOptions {
+        self.file_flag(raw::GIT_MERGE_FILE_DIFF_MINIMAL as u32, minimal)
+    }
+
+    /// Acquire a pointer to the underlying raw options.
+    pub unsafe fn raw(&self) -> *const raw::git_merge_options {
+        &self.raw as *const _
+    }
+}
+
+impl<'repo> Binding for AnnotatedCommit<'repo> {
+    type Raw = *mut raw::git_annotated_commit;
+    unsafe fn from_raw(raw: *mut raw::git_annotated_commit) -> AnnotatedCommit<'repo> {
+        AnnotatedCommit {
+            raw,
+            _marker: marker::PhantomData,
+        }
+    }
+    fn raw(&self) -> *mut raw::git_annotated_commit {
+        self.raw
+    }
+}
+
+impl<'repo> Drop for AnnotatedCommit<'repo> {
+    fn drop(&mut self) {
+        unsafe { raw::git_annotated_commit_free(self.raw) }
+    }
+}