add verbose mode (-v flag)

cmd/task/task.go

@@ -14,7 +14,7 @@ var (
 	version = "master"
 )
 
-const usage = `Usage: task [-ifw] [--init] [--force] [--watch] [task...]
+const usage = `Usage: task [-ifwv] [--init] [--force] [--watch] [--verbose] [task...]
 
 Runs the specified task(s). Falls back to the "default" task if no task name
 was specified, or lists all tasks if an unknown task name was specified.
@@ -45,12 +45,14 @@ func main() {
 		init        bool
 		force       bool
 		watch       bool
+		verbose     bool
 	)
 
 	pflag.BoolVar(&versionFlag, "version", false, "show Task version")
 	pflag.BoolVarP(&init, "init", "i", false, "creates a new Taskfile.yml in the current folder")
 	pflag.BoolVarP(&force, "force", "f", false, "forces execution even when the task is up-to-date")
 	pflag.BoolVarP(&watch, "watch", "w", false, "enables watch of the given task")
+	pflag.BoolVarP(&verbose, "verbose", "v", false, "enables verbose mode")
 	pflag.Parse()
 
 	if versionFlag {
@@ -70,8 +72,9 @@ func main() {
 	}
 
 	e := task.Executor{
-		Force: force,
-		Watch: watch,
+		Force:   force,
+		Watch:   watch,
+		Verbose: verbose,
 
 		Stdin:  os.Stdin,
 		Stdout: os.Stdout,

log.go

@@ -11,3 +11,15 @@ func (e *Executor) println(args ...interface{}) {
 func (e *Executor) printfln(format string, args ...interface{}) {
 	fmt.Fprintf(e.Stdout, format+"\n", args...)
 }
+
+func (e *Executor) verbosePrintln(args ...interface{}) {
+	if e.Verbose {
+		e.println(args...)
+	}
+}
+
+func (e *Executor) verbosePrintfln(format string, args ...interface{}) {
+	if e.Verbose {
+		e.printfln(format, args...)
+	}
+}

task.go

@@ -21,10 +21,11 @@ const (
 
 // Executor executes a Taskfile
 type Executor struct {
-	Tasks Tasks
-	Dir   string
-	Force bool
-	Watch bool
+	Tasks   Tasks
+	Dir     string
+	Force   bool
+	Watch   bool
+	Verbose bool
 
 	Stdin  io.Reader
 	Stdout io.Writer

variable_handling.go

@@ -45,6 +45,7 @@ func (e *Executor) handleDynamicVariableContent(value string) (string, error) {
 	}
 
 	result = strings.TrimSpace(result)
+	e.verbosePrintfln(`task: dynamic variable: "%s", result: "%s"`, value, result)
 	return result, nil
 }