fix: a couple of fixes and improvements on task --init (#2433)

* Fixed check for an existing Taskfile: look for all possibilities, and
  not only `Taskfile.yml` specifically.
* Added a description (`desc`) to the `default` task. Important to at
  least `task --list` work by default (a core feature).
* Changed top comment to YAML language server comment.

init.go

@@ -6,9 +6,10 @@ import (
 
 	"github.com/go-task/task/v3/errors"
 	"github.com/go-task/task/v3/internal/filepathext"
+	"github.com/go-task/task/v3/taskfile"
 )
 
-const defaultTaskFilename = "Taskfile.yml"
+const defaultFilename = "Taskfile.yml"
 
 //go:embed taskfile/templates/default.yml
 var DefaultTaskfile string
@@ -20,22 +21,30 @@ var DefaultTaskfile string
 //
 // The final file path is always returned and may be different from the input path.
 func InitTaskfile(path string) (string, error) {
-	fi, err := os.Stat(path)
-	if err == nil && !fi.IsDir() {
+	info, err := os.Stat(path)
+	if err == nil && !info.IsDir() {
 		return path, errors.TaskfileAlreadyExistsError{}
 	}
 
-	if fi != nil && fi.IsDir() {
-		path = filepathext.SmartJoin(path, defaultTaskFilename)
-		// path was a directory, so check if Taskfile.yml exists in it
-		if _, err := os.Stat(path); err == nil {
+	if info != nil && info.IsDir() {
+		// path was a directory, check if there is a Taskfile already
+		if hasDefaultTaskfile(path) {
 			return path, errors.TaskfileAlreadyExistsError{}
 		}
+		path = filepathext.SmartJoin(path, defaultFilename)
 	}
 
 	if err := os.WriteFile(path, []byte(DefaultTaskfile), 0o644); err != nil {
 		return path, err
 	}
-
 	return path, nil
 }
+
+func hasDefaultTaskfile(dir string) bool {
+	for _, name := range taskfile.DefaultTaskfiles {
+		if _, err := os.Stat(filepathext.SmartJoin(dir, name)); err == nil {
+			return true
+		}
+	}
+	return false
+}