Improve taskfile not found error message

cmd/task/task.go

@@ -115,6 +115,10 @@ func run() error {
 		task.WithVersionCheck(true),
 	)
 	if err := e.Setup(); err != nil {
+		if errors.Is(err, errors.TaskfileNotFoundError{}) {
+			return errors.New("No supported taskfile was found: " +
+				"please check the documentation for a list of supported file names.")
+		}
 		return err
 	}
 

errors/errors_taskfile.go

@@ -27,6 +27,14 @@
 	return CodeTaskfileNotFound
 }
 
+func (err TaskfileNotFoundError) Is(target error) bool {
+	_, ok := target.(TaskfileNotFoundError)
+	if ok {
+		return true
+	}
+	return false
+}
+
 // TaskfileAlreadyExistsError is returned on creating a Taskfile if one already
 // exists.
 type TaskfileAlreadyExistsError struct{}

taskfile/node_file.go

@@ -2,10 +2,12 @@ package taskfile
 
 import (
 	"io"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
 
+	"github.com/go-task/task/v3/errors"
 	"github.com/go-task/task/v3/internal/execext"
 	"github.com/go-task/task/v3/internal/filepathext"
 	"github.com/go-task/task/v3/internal/fsext"
@@ -22,6 +24,16 @@ func NewFileNode(entrypoint, dir string, opts ...NodeOption) (*FileNode, error)
 	base := NewBaseNode(dir, opts...)
 	entrypoint, base.dir, err = fsext.Search(entrypoint, base.dir, defaultTaskfiles)
 	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			// We include the path in the error if one exists
+			var pathErr *fs.PathError
+			if errors.As(err, &pathErr) {
+				return nil, &errors.TaskfileNotFoundError{
+					URI: pathErr.Path,
+				}
+			}
+			return nil, &errors.TaskfileNotFoundError{}
+		}
 		return nil, err
 	}
 	return &FileNode{