Split up main package into multiple files

commit.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+var cm sync.Mutex
+
+func commit(
+	tree *git.Worktree,
+	padfile string,
+	url string,
+) (plumbing.Hash, error) {
+	cm.Lock()
+	defer cm.Unlock()
+
+	if _, err := tree.Add(padfile); err != nil {
+		return plumbing.ZeroHash, fmt.Errorf("Failed to stage %s: %w", padfile, err)
+	}
+
+	status, err := tree.Status()
+	if err != nil {
+		return plumbing.ZeroHash, fmt.Errorf("Failed to get status of %s", padfile)
+	}
+
+	fileStatus := status.File(padfile)
+	if fileStatus.Staging != git.Added && fileStatus.Staging != git.Modified {
+		return plumbing.ZeroHash, nothingToDo
+	}
+
+	commit, err := tree.Commit(
+		fmt.Sprintf("Updated %s from %s", padfile, url),
+		&git.CommitOptions{
+			All: false,
+			Author: &object.Signature{
+				Name:  "Pad Archiver[bot]",
+				Email: "dadada+pad-archiver@dadada.li@",
+				When:  time.Now(),
+			},
+		},
+	)
+
+	if err != nil {
+		return plumbing.ZeroHash, fmt.Errorf("Failed to commit %s: %w", padfile, err)
+	}
+
+	return commit, nil
+}