Move git diff codes from models to services/gitdiff (#7889)

* move git diff codes from models to services/gitdiff

* fix template

* fix test

* fix template

1 files changed, 69 insertions, 0 deletions

diff --git a/services/comments/comments.go b/services/comments/comments.go
new file mode 100644
index 0000000000..bd261ff0a5
--- /dev/null
+++ b/services/comments/comments.go
@@ -0,0 +1,69 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package comments
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/services/gitdiff"
+)
+
+// CreateCodeComment creates a plain code comment at the specified line / path
+func CreateCodeComment(doer *models.User, repo *models.Repository, issue *models.Issue, content, treePath string, line, reviewID int64) (*models.Comment, error) {
+	var commitID, patch string
+	pr, err := models.GetPullRequestByIssueID(issue.ID)
+	if err != nil {
+		return nil, fmt.Errorf("GetPullRequestByIssueID: %v", err)
+	}
+	if err := pr.GetBaseRepo(); err != nil {
+		return nil, fmt.Errorf("GetHeadRepo: %v", err)
+	}
+	gitRepo, err := git.OpenRepository(pr.BaseRepo.RepoPath())
+	if err != nil {
+		return nil, fmt.Errorf("OpenRepository: %v", err)
+	}
+
+	// FIXME validate treePath
+	// Get latest commit referencing the commented line
+	// No need for get commit for base branch changes
+	if line > 0 {
+		commit, err := gitRepo.LineBlame(pr.GetGitRefName(), gitRepo.Path, treePath, uint(line))
+		if err == nil {
+			commitID = commit.ID.String()
+		} else if !strings.Contains(err.Error(), "exit status 128 - fatal: no such path") {
+			return nil, fmt.Errorf("LineBlame[%s, %s, %s, %d]: %v", pr.GetGitRefName(), gitRepo.Path, treePath, line, err)
+		}
+	}
+
+	// Only fetch diff if comment is review comment
+	if reviewID != 0 {
+		headCommitID, err := gitRepo.GetRefCommitID(pr.GetGitRefName())
+		if err != nil {
+			return nil, fmt.Errorf("GetRefCommitID[%s]: %v", pr.GetGitRefName(), err)
+		}
+		patchBuf := new(bytes.Buffer)
+		if err := gitdiff.GetRawDiffForFile(gitRepo.Path, pr.MergeBase, headCommitID, gitdiff.RawDiffNormal, treePath, patchBuf); err != nil {
+			return nil, fmt.Errorf("GetRawDiffForLine[%s, %s, %s, %s]: %v", err, gitRepo.Path, pr.MergeBase, headCommitID, treePath)
+		}
+		patch = gitdiff.CutDiffAroundLine(patchBuf, int64((&models.Comment{Line: line}).UnsignedLine()), line < 0, setting.UI.CodeCommentLines)
+	}
+	return models.CreateComment(&models.CreateCommentOptions{
+		Type:      models.CommentTypeCode,
+		Doer:      doer,
+		Repo:      repo,
+		Issue:     issue,
+		Content:   content,
+		LineNum:   line,
+		TreePath:  treePath,
+		CommitSHA: commitID,
+		ReviewID:  reviewID,
+		Patch:     patch,
+	})
+}