func patch(c *object.Commit, path string) ([]diffmatchpatch.Diff, error) {
// get contents of the file in the commit
file, err := c.File(path)
if err != nil {
return nil, err
}
content, err := file.Contents()
if err != nil {
return nil, err
}
// get contents of the file in the first parent of the commit
var contentParent string
iter := c.Parents()
parent, err := iter.Next()
if err != nil {
return nil, err
}
file, err = parent.File(path)
if err != nil {
contentParent = ""
} else {
contentParent, err = file.Contents()
if err != nil {
return nil, err
}
}
// compare the contents of parent and child
return diff.Do(content, contentParent), nil
}
func (s *suiteCommon) TestAll(c *C) {
for i, t := range diffTests {
diffs := diff.Do(t.src, t.dst)
src := diff.Src(diffs)
dst := diff.Dst(diffs)
c.Assert(src, Equals, t.src, Commentf("subtest %d, src=%q, dst=%q, bad calculated src", i, t.src, t.dst))
c.Assert(dst, Equals, t.dst, Commentf("subtest %d, src=%q, dst=%q, bad calculated dst", i, t.src, t.dst))
}
}
// Assigns origin to vertexes in current (c) rev from data in its previous (p)
// revision
func (b *blame) assignOrigin(c, p int) {
// assign origin based on diff info
hunks := diff.Do(b.data[p], b.data[c])
sl := -1 // source line
dl := -1 // destination line
for h := range hunks {
hLines := countLines(hunks[h].Text)
for hl := 0; hl < hLines; hl++ {
switch {
case hunks[h].Type == 0:
sl++
dl++
b.graph[c][dl] = b.graph[p][sl]
case hunks[h].Type == 1:
dl++
b.graph[c][dl] = (*object.Commit)(b.revs[c])
case hunks[h].Type == -1:
sl++
default:
panic("unreachable")
}
}
}
}
func (s *suiteCommon) TestDo(c *C) {
for i, t := range doTests {
diffs := diff.Do(t.src, t.dst)
c.Assert(diffs, DeepEquals, t.exp, Commentf("subtest %d", i))
}
}