Blame support for files

This also includes a diff package and revlist package (needed by
blame)

Some extra packfiles (<1MB) are also included, to be used as fixtures in
the tests.

1 files changed, 111 insertions, 0 deletions

diff --git a/common_test.go b/common_test.go
index cf4fc29..0695d5f 100644
--- a/common_test.go
+++ b/common_test.go
@@ -8,6 +8,7 @@ import (
 	. "gopkg.in/check.v1"
 	"gopkg.in/src-d/go-git.v2/clients/common"
 	"gopkg.in/src-d/go-git.v2/core"
+	"gopkg.in/src-d/go-git.v2/formats/packfile"
 )
 
 func Test(t *testing.T) { TestingT(t) }
@@ -42,3 +43,113 @@ func (s *MockGitUploadPackService) Fetch(*common.GitUploadPackRequest) (io.ReadC
 	r, _ := os.Open("formats/packfile/fixtures/git-fixture.ref-delta")
 	return r, nil
 }
+
+type SuiteCommon struct {
+	repos map[string]*Repository
+}
+
+var _ = Suite(&SuiteCommon{})
+
+var fixtureRepos = [...]struct {
+	url      string
+	packfile string
+}{
+	{"https://github.com/tyba/git-fixture.git", "formats/packfile/fixtures/git-fixture.ofs-delta"},
+}
+
+// create the repositories of the fixtures
+func (s *SuiteCommon) SetUpSuite(c *C) {
+	s.repos = make(map[string]*Repository, 0)
+	for _, fixRepo := range fixtureRepos {
+		s.repos[fixRepo.url] = NewPlainRepository()
+
+		d, err := os.Open(fixRepo.packfile)
+		defer func() {
+			c.Assert(d.Close(), IsNil)
+		}()
+		c.Assert(err, IsNil)
+
+		r := packfile.NewReader(d)
+		r.Format = packfile.OFSDeltaFormat // TODO: how to know the format of a pack file ahead of time?
+
+		_, err = r.Read(s.repos[fixRepo.url].Storage)
+		c.Assert(err, IsNil)
+	}
+}
+
+var countLinesTests = [...]struct {
+	i string // the string we want to count lines from
+	e int    // the expected number of lines in i
+}{
+	{"", 0},
+	{"a", 1},
+	{"a\n", 1},
+	{"a\nb", 2},
+	{"a\nb\n", 2},
+	{"a\nb\nc", 3},
+	{"a\nb\nc\n", 3},
+	{"first line\n\tsecond line\nthird line\n", 3},
+}
+
+func (s *SuiteCommon) TestCountLines(c *C) {
+	for i, t := range countLinesTests {
+		o := CountLines(t.i)
+		c.Assert(o, Equals, t.e, Commentf("subtest %d, input=%q", i, t.i))
+	}
+}
+
+var findFileTests = []struct {
+	repo     string // the repo name as in localRepos
+	commit   string // the commit to search for the file
+	path     string // the path of the file to find
+	blobHash string // expected hash of the returned file
+	found    bool   // expected found value
+}{
+	// use git ls-tree commit to get the hash of the blobs
+	{"https://github.com/tyba/git-fixture.git", "b029517f6300c2da0f4b651b8642506cd6aaf45d", "not-found",
+		"", false},
+	{"https://github.com/tyba/git-fixture.git", "b029517f6300c2da0f4b651b8642506cd6aaf45d", ".gitignore",
+		"32858aad3c383ed1ff0a0f9bdf231d54a00c9e88", true},
+	{"https://github.com/tyba/git-fixture.git", "b029517f6300c2da0f4b651b8642506cd6aaf45d", "LICENSE",
+		"c192bd6a24ea1ab01d78686e417c8bdc7c3d197f", true},
+
+	{"https://github.com/tyba/git-fixture.git", "6ecf0ef2c2dffb796033e5a02219af86ec6584e5", "not-found",
+		"", false},
+	{"https://github.com/tyba/git-fixture.git", "6ecf0ef2c2dffb796033e5a02219af86ec6584e5", ".gitignore",
+		"32858aad3c383ed1ff0a0f9bdf231d54a00c9e88", true},
+	{"https://github.com/tyba/git-fixture.git", "6ecf0ef2c2dffb796033e5a02219af86ec6584e5", "binary.jpg",
+		"d5c0f4ab811897cadf03aec358ae60d21f91c50d", true},
+	{"https://github.com/tyba/git-fixture.git", "6ecf0ef2c2dffb796033e5a02219af86ec6584e5", "LICENSE",
+		"c192bd6a24ea1ab01d78686e417c8bdc7c3d197f", true},
+
+	{"https://github.com/tyba/git-fixture.git", "35e85108805c84807bc66a02d91535e1e24b38b9", "binary.jpg",
+		"d5c0f4ab811897cadf03aec358ae60d21f91c50d", true},
+	{"https://github.com/tyba/git-fixture.git", "b029517f6300c2da0f4b651b8642506cd6aaf45d", "binary.jpg",
+		"", false},
+
+	{"https://github.com/tyba/git-fixture.git", "6ecf0ef2c2dffb796033e5a02219af86ec6584e5", "CHANGELOG",
+		"d3ff53e0564a9f87d8e84b6e28e5060e517008aa", true},
+	{"https://github.com/tyba/git-fixture.git", "1669dce138d9b841a518c64b10914d88f5e488ea", "CHANGELOG",
+		"d3ff53e0564a9f87d8e84b6e28e5060e517008aa", true},
+	{"https://github.com/tyba/git-fixture.git", "a5b8b09e2f8fcb0bb99d3ccb0958157b40890d69", "CHANGELOG",
+		"d3ff53e0564a9f87d8e84b6e28e5060e517008aa", true},
+	{"https://github.com/tyba/git-fixture.git", "35e85108805c84807bc66a02d91535e1e24b38b9", "CHANGELOG",
+		"d3ff53e0564a9f87d8e84b6e28e5060e517008aa", false},
+	{"https://github.com/tyba/git-fixture.git", "b8e471f58bcbca63b07bda20e428190409c2db47", "CHANGELOG",
+		"d3ff53e0564a9f87d8e84b6e28e5060e517008aa", true},
+	{"https://github.com/tyba/git-fixture.git", "b029517f6300c2da0f4b651b8642506cd6aaf45d", "CHANGELOG",
+		"d3ff53e0564a9f87d8e84b6e28e5060e517008aa", false},
+}
+
+func (s *SuiteCommon) TestFindFile(c *C) {
+	for i, t := range findFileTests {
+		commit, err := s.repos[t.repo].Commit(core.NewHash(t.commit))
+		c.Assert(err, IsNil, Commentf("subtest %d: %v (%s)", i, err, t.commit))
+
+		file, found := FindFile(t.path, commit)
+		c.Assert(found, Equals, t.found, Commentf("subtest %d, path=%s, commit=%s", i, t.path, t.commit))
+		if found {
+			c.Assert(file.Hash.String(), Equals, t.blobHash, Commentf("subtest %d, commit=%s, path=%s", i, t.commit, t.path))
+		}
+	}
+}