Replace "default find command" with built-in directory traversal

src/reader.go

@@ -6,14 +6,13 @@ import (
 	"io"
 	"os"
 	"os/exec"
-	"path"
 	"path/filepath"
 	"sync"
 	"sync/atomic"
 	"time"
 
+	"github.com/charlievieth/fastwalk"
 	"github.com/junegunn/fzf/src/util"
-	"github.com/saracen/walker"
 )
 
 // Reader reads from command or standard input
@@ -77,14 +76,13 @@ func (r *Reader) fin(success bool) {
 
 func (r *Reader) terminate() {
 	r.mutex.Lock()
-	defer func() { r.mutex.Unlock() }()
-
 	r.killed = true
 	if r.exec != nil && r.exec.Process != nil {
 		util.KillCommand(r.exec)
-	} else if defaultCommand != "" {
+	} else {
 		os.Stdin.Close()
 	}
+	r.mutex.Unlock()
 }
 
 func (r *Reader) restart(command string) {
@@ -99,24 +97,9 @@ func (r *Reader) ReadSource() {
 	r.startEventPoller()
 	var success bool
 	if util.IsTty() {
-		// The default command for *nix requires a shell that supports "pipefail"
-		// https://unix.stackexchange.com/a/654932/62171
-		shell := "bash"
-		currentShell := os.Getenv("SHELL")
-		currentShellName := path.Base(currentShell)
-		for _, shellName := range []string{"bash", "zsh", "ksh", "ash", "hush", "mksh", "yash"} {
-			if currentShellName == shellName {
-				shell = currentShell
-				break
-			}
-		}
 		cmd := os.Getenv("FZF_DEFAULT_COMMAND")
 		if len(cmd) == 0 {
-			if defaultCommand != "" {
-				success = r.readFromCommand(&shell, defaultCommand)
-			} else {
-				success = r.readFiles()
-			}
+			success = r.readFiles()
 		} else {
 			success = r.readFromCommand(nil, cmd)
 		}
@@ -163,10 +146,14 @@ func (r *Reader) readFromStdin() bool {
 
 func (r *Reader) readFiles() bool {
 	r.killed = false
-	fn := func(path string, mode os.FileInfo) error {
+	conf := fastwalk.Config{Follow: true}
+	fn := func(path string, de os.DirEntry, err error) error {
+		if err != nil {
+			return nil
+		}
 		path = filepath.Clean(path)
 		if path != "." {
-			isDir := mode.Mode().IsDir()
+			isDir := de.IsDir()
 			if isDir && filepath.Base(path)[0] == '.' {
 				return filepath.SkipDir
 			}
@@ -181,10 +168,7 @@ func (r *Reader) readFiles() bool {
 		}
 		return nil
 	}
-	cb := walker.WithErrorCallback(func(pathname string, err error) error {
-		return nil
-	})
-	return walker.Walk(".", fn, cb) == nil
+	return fastwalk.Walk(&conf, ".", fn) == nil
 }
 
 func (r *Reader) readFromCommand(shell *string, command string) bool {