Refactor error handling

update.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"bufio"
+	"log"
+	"sync"
+
+	"github.com/go-git/go-git/v5"
+)
+
+func updatePads(pads *bufio.Scanner, tree *git.Worktree) {
+	defer tree.Clean(&git.CleanOptions{Dir: true})
+
+	filesystemRoot := tree.Filesystem.Root()
+
+	var wg sync.WaitGroup
+	for pads.Scan() {
+		wg.Add(1)
+		padurl := pads.Text()
+
+		go func() {
+			defer wg.Done()
+			if _, err := updatePad(filesystemRoot, padurl, tree); err != nil {
+				log.Printf("%s", err)
+			}
+		}()
+	}
+	wg.Wait()
+}
+
+func updatePad(filesystemRoot string, padurl string, tree *git.Worktree) (padfile string, err error) {
+	padfile, err = download(filesystemRoot, padurl)
+	if err != nil {
+		return
+	}
+	log.Printf("Downloaded %s", padurl)
+	if _, err = commit(tree, padfile, padurl); err != nil {
+		return
+	} else {
+		log.Printf("Committed %s", padfile)
+		return
+	}
+}