Add a dry run flag

main.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"path/filepath"
 	"sync/atomic"
+
 	utils "git.site.quack-lab.dev/dave/cyutils"
 )
 
@@ -27,11 +28,19 @@ func main() {
 	file := flag.String("f", "", "file to read instructions from")
 	debug := flag.Bool("d", false, "debug")
 	undoF := flag.Bool("u", false, "undo")
+	dryRun := flag.Bool("n", false, "dry run (no filesystem changes)")
 	flag.Parse()
 	undo = *undoF
 
 	setupLogging(*debug)
 
+	if *dryRun {
+		filesystem = NewDryRunFileSystem()
+		LogInfo("Dry run mode enabled - no filesystem changes will be made")
+	} else {
+		filesystem = NewRealFileSystem()
+	}
+
 	instructions := make(chan *LinkInstruction, 1000)
 	status := make(chan error)
 
@@ -43,9 +52,11 @@ func main() {
 
 	if instructionsDone == 0 {
 		LogInfo("No instructions were processed")
+		printSummary(filesystem)
 		os.Exit(1)
 	}
 	LogInfo("All done")
+	printSummary(filesystem)
 }
 
 // setupLogging configures logging based on debug flag
@@ -162,6 +173,17 @@ func processInstructions(instructions chan *LinkInstruction) int32 {
 	return instructionsDone
 }
 
+func printSummary(fs FileSystem) {
+	lines := fs.SummaryLines()
+	if len(lines) == 0 {
+		return
+	}
+	LogInfo("Summary:")
+	for _, line := range lines {
+		LogInfo("%s", line)
+	}
+}
+
 func IsPipeInput() bool {
 	info, err := os.Stdin.Stat()
 	if err != nil {