Fix count for commit graph last page (#8843)

* Fix count for commit graph last page

* Remove used once variable

* Move func to model

* capitalize method name

* fix error message

3 files changed, 22 insertions, 1 deletions

diff --git a/modules/git/commit.go b/modules/git/commit.go
index 45b943e79e..ce55dd55f6 100644
--- a/modules/git/commit.go
+++ b/modules/git/commit.go
@@ -248,6 +248,16 @@ func CommitChanges(repoPath string, opts CommitChangesOptions) error {
 	return err
 }
 
+// AllCommitsCount returns count of all commits in repository
+func AllCommitsCount(repoPath string) (int64, error) {
+	stdout, err := NewCommand("rev-list", "--all", "--count").RunInDir(repoPath)
+	if err != nil {
+		return 0, err
+	}
+
+	return strconv.ParseInt(strings.TrimSpace(stdout), 10, 64)
+}
+
 func commitsCount(repoPath, revision, relpath string) (int64, error) {
 	cmd := NewCommand("rev-list", "--count")
 	cmd.AddArguments(revision)
diff --git a/modules/git/repo.go b/modules/git/repo.go
index e1d75ca4aa..4c6690b913 100644
--- a/modules/git/repo.go
+++ b/modules/git/repo.go
@@ -46,6 +46,11 @@ type GPGSettings struct {
 
 const prettyLogFormat = `--pretty=format:%H`
 
+// GetAllCommitsCount returns count of all commits in repository
+func (repo *Repository) GetAllCommitsCount() (int64, error) {
+	return AllCommitsCount(repo.Path)
+}
+
 func (repo *Repository) parsePrettyFormatLogToList(logs []byte) (*list.List, error) {
 	l := list.New()
 	if len(logs) == 0 {
diff --git a/routers/repo/commit.go b/routers/repo/commit.go
index 550e4c3a9c..f067729ca9 100644
--- a/routers/repo/commit.go
+++ b/routers/repo/commit.go
@@ -91,6 +91,12 @@ func Graph(ctx *context.Context) {
 		return
 	}
 
+	allCommitsCount, err := ctx.Repo.GitRepo.GetAllCommitsCount()
+	if err != nil {
+		ctx.ServerError("GetAllCommitsCount", err)
+		return
+	}
+
 	page := ctx.QueryInt("page")
 
 	graph, err := models.GetCommitGraph(ctx.Repo.GitRepo, page)
@@ -105,7 +111,7 @@ func Graph(ctx *context.Context) {
 	ctx.Data["CommitCount"] = commitsCount
 	ctx.Data["Branch"] = ctx.Repo.BranchName
 	ctx.Data["RequireGitGraph"] = true
-	ctx.Data["Page"] = context.NewPagination(int(commitsCount), setting.UI.GraphMaxCommitNum, page, 5)
+	ctx.Data["Page"] = context.NewPagination(int(allCommitsCount), setting.UI.GraphMaxCommitNum, page, 5)
 	ctx.HTML(200, tplGraph)
 }