From 978a6e5ecb1ab7a8a224d1c97424066faf533568 Mon Sep 17 00:00:00 2001
From: ardnew <andrew@ardnew.com>
Date: Thu, 1 Jul 2021 16:05:46 -0500
Subject: [PATCH] quickly print task names only with flags --silent and --list

---
 cmd/task/task.go |  4 ++++
 help.go          | 33 +++++++++++++++++++++++++++++++++
 task.go          | 15 +++++++++++++--
 3 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/cmd/task/task.go b/cmd/task/task.go
index 8eff5db5..a972cc2f 100644
--- a/cmd/task/task.go
+++ b/cmd/task/task.go
@@ -158,6 +158,10 @@ func main() {
 
 		OutputStyle: output,
 	}
+	if list && silent {
+		e.PrintTaskNames()
+		return
+	}
 	if err := e.Setup(); err != nil {
 		log.Fatal(err)
 	}
diff --git a/help.go b/help.go
index ca0d7841..61a57610 100644
--- a/help.go
+++ b/help.go
@@ -2,7 +2,10 @@ package task
 
 import (
 	"fmt"
+	"io"
+	"os"
 	"sort"
+	"strings"
 	"text/tabwriter"
 
 	"github.com/go-task/task/v3/internal/logger"
@@ -70,3 +73,33 @@ func (e *Executor) tasksWithDesc() (tasks []*taskfile.Task) {
 	sort.Slice(tasks, func(i, j int) bool { return tasks[i].Task < tasks[j].Task })
 	return
 }
+
+// PrintTaskNames prints only the task names in a taskfile.
+func (e *Executor) PrintTaskNames() error {
+	// if called from cmd/task.go, e.Taskfile has not yet been parsed
+	if nil == e.Taskfile {
+		err := e.readTaskfile()
+		if nil != err {
+			return err
+		}
+	}
+	var w io.Writer = os.Stdout
+	if nil != e.Stdout {
+		w = e.Stdout
+	}
+
+	// create a slice from all map values
+	task := make([]*taskfile.Task, 0, len(e.Taskfile.Tasks))
+	for _, t := range e.Taskfile.Tasks {
+		task = append(task, t)
+	}
+
+	sort.Slice(task,
+		func(i, j int) bool {
+			return task[i].Task < task[j].Task
+		})
+	for _, t := range task {
+		fmt.Fprintf(w, "%s\n", strings.TrimSuffix(t.Task, ":"))
+	}
+	return nil
+}
diff --git a/task.go b/task.go
index ecd3ed35..f0a82446 100644
--- a/task.go
+++ b/task.go
@@ -104,10 +104,21 @@ func (e *Executor) Run(ctx context.Context, calls ...taskfile.Call) error {
 	return g.Wait()
 }
 
-// Setup setups Executor's internal state
-func (e *Executor) Setup() error {
+// readTaskfile selects and parses the entrypoint.
+func (e *Executor) readTaskfile() error {
+	// select the default entrypoint if not provided
+	if e.Entrypoint == "" {
+		e.Entrypoint = "Taskfile.yml"
+	}
+
 	var err error
 	e.Taskfile, err = read.Taskfile(e.Dir, e.Entrypoint)
+	return err
+}
+
+// Setup setups Executor's internal state
+func (e *Executor) Setup() error {
+	err := e.readTaskfile()
 	if err != nil {
 		return err
 	}