Update FZF_DEFAULT_COMMAND

- Use bash for `set -o pipefail`
- Fall back to simpler find command when the original command failed

Related: #1061

src/constants.go

@@ -55,7 +55,7 @@ var defaultCommand string
 
 func init() {
 	if !util.IsWindows() {
-		defaultCommand = `command find -L . -mindepth 1 \( -path '*/\.*' -o -fstype 'sysfs' -o -fstype 'devfs' -o -fstype 'devtmpfs' -o -fstype 'proc' \) -prune -o -type f -print -o -type l -print 2> /dev/null | cut -b3-`
+		defaultCommand = `set -o pipefail; (command find -L . -mindepth 1 \( -path '*/\.*' -o -fstype 'sysfs' -o -fstype 'devfs' -o -fstype 'devtmpfs' -o -fstype 'proc' \) -prune -o -type f -print -o -type l -print || command find -L . -mindepth 1 -path '*/\.*' -prune -o -type f -print -o -type l -print) 2> /dev/null | cut -b3-`
 	} else if os.Getenv("TERM") == "cygwin" {
 		defaultCommand = `sh -c "command find -L . -mindepth 1 -path '*/\.*' -prune -o -type f -print -o -type l -print 2> /dev/null | cut -b3-"`
 	} else {

src/reader.go

@@ -56,9 +56,11 @@ func (r *Reader) ReadSource() {
 	if util.IsTty() {
 		cmd := os.Getenv("FZF_DEFAULT_COMMAND")
 		if len(cmd) == 0 {
-			cmd = defaultCommand
+			// The default command for *nix requires bash
+			success = r.readFromCommand("bash", defaultCommand)
+		} else {
+			success = r.readFromCommand("sh", cmd)
 		}
-		success = r.readFromCommand(cmd)
 	} else {
 		success = r.readFromStdin()
 	}
@@ -100,8 +102,8 @@ func (r *Reader) readFromStdin() bool {
 	return true
 }
 
-func (r *Reader) readFromCommand(cmd string) bool {
+func (r *Reader) readFromCommand(shell string, cmd string) bool {
-	listCommand := util.ExecCommand(cmd)
+	listCommand := util.ExecCommandWith(shell, cmd)
 	out, err := listCommand.StdoutPipe()
 	if err != nil {
 		return false

src/reader_test.go

@@ -23,7 +23,7 @@ func TestReadFromCommand(t *testing.T) {
 	}
 
 	// Normal command
-	reader.fin(reader.readFromCommand(`echo abc && echo def`))
+	reader.fin(reader.readFromCommand("sh", `echo abc && echo def`))
 	if len(strs) != 2 || strs[0] != "abc" || strs[1] != "def" {
 		t.Errorf("%s", strs)
 	}
@@ -48,7 +48,7 @@ func TestReadFromCommand(t *testing.T) {
 	reader.startEventPoller()
 
 	// Failing command
-	reader.fin(reader.readFromCommand(`no-such-command`))
+	reader.fin(reader.readFromCommand("sh", `no-such-command`))
 	strs = []string{}
 	if len(strs) > 0 {
 		t.Errorf("%s", strs)

src/util/util_unix.go

@@ -14,6 +14,11 @@ func ExecCommand(command string) *exec.Cmd {
 	if len(shell) == 0 {
 		shell = "sh"
 	}
+	return ExecCommandWith(shell, command)
+}
+
+// ExecCommandWith executes the given command with the specified shell
+func ExecCommandWith(shell string, command string) *exec.Cmd {
 	return exec.Command(shell, "-c", command)
 }
 

src/util/util_windows.go

@@ -10,8 +10,14 @@ import (
 	"github.com/mattn/go-shellwords"
 )
 
-// ExecCommand executes the given command with $SHELL
+// ExecCommand executes the given command with cmd
 func ExecCommand(command string) *exec.Cmd {
+	return ExecCommandWith("cmd", command)
+}
+
+// ExecCommandWith executes the given command with cmd. _shell parameter is
+// ignored on Windows.
+func ExecCommandWith(_shell string, command string) *exec.Cmd {
 	args, _ := shellwords.Parse(command)
 	allArgs := make([]string, len(args)+1)
 	allArgs[0] = "/c"