Move commit related functions to gitrepo package (#35600)

modules/gitrepo/commit_file.go

@@ -0,0 +1,93 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package gitrepo
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"io"
+
+	"code.gitea.io/gitea/modules/git/gitcmd"
+	"code.gitea.io/gitea/modules/log"
+)
+
+// CommitFileStatus represents status of files in a commit.
+type CommitFileStatus struct {
+	Added    []string
+	Removed  []string
+	Modified []string
+}
+
+// NewCommitFileStatus creates a CommitFileStatus
+func NewCommitFileStatus() *CommitFileStatus {
+	return &CommitFileStatus{
+		[]string{}, []string{}, []string{},
+	}
+}
+
+func parseCommitFileStatus(fileStatus *CommitFileStatus, stdout io.Reader) {
+	rd := bufio.NewReader(stdout)
+	peek, err := rd.Peek(1)
+	if err != nil {
+		if err != io.EOF {
+			log.Error("Unexpected error whilst reading from git log --name-status. Error: %v", err)
+		}
+		return
+	}
+	if peek[0] == '\n' || peek[0] == '\x00' {
+		_, _ = rd.Discard(1)
+	}
+	for {
+		modifier, err := rd.ReadString('\x00')
+		if err != nil {
+			if err != io.EOF {
+				log.Error("Unexpected error whilst reading from git log --name-status. Error: %v", err)
+			}
+			return
+		}
+		file, err := rd.ReadString('\x00')
+		if err != nil {
+			if err != io.EOF {
+				log.Error("Unexpected error whilst reading from git log --name-status. Error: %v", err)
+			}
+			return
+		}
+		file = file[:len(file)-1]
+		switch modifier[0] {
+		case 'A':
+			fileStatus.Added = append(fileStatus.Added, file)
+		case 'D':
+			fileStatus.Removed = append(fileStatus.Removed, file)
+		case 'M':
+			fileStatus.Modified = append(fileStatus.Modified, file)
+		}
+	}
+}
+
+// GetCommitFileStatus returns file status of commit in given repository.
+func GetCommitFileStatus(ctx context.Context, repo Repository, commitID string) (*CommitFileStatus, error) {
+	stdout, w := io.Pipe()
+	done := make(chan struct{})
+	fileStatus := NewCommitFileStatus()
+	go func() {
+		parseCommitFileStatus(fileStatus, stdout)
+		close(done)
+	}()
+
+	stderr := new(bytes.Buffer)
+	err := gitcmd.NewCommand("log", "--name-status", "-m", "--pretty=format:", "--first-parent", "--no-renames", "-z", "-1").
+		AddDynamicArguments(commitID).
+		WithDir(repoPath(repo)).
+		WithStdout(w).
+		WithStderr(stderr).
+		Run(ctx)
+	w.Close() // Close writer to exit parsing goroutine
+	if err != nil {
+		return nil, gitcmd.ConcatenateError(err, stderr.String())
+	}
+
+	<-done
+	return fileStatus, nil
+}