Allow empty pointer and marker

Close #3879

4 files changed, 58 insertions, 21 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 337d0268..d7b5a9e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,15 @@ CHANGELOG
   ```
     - `$FZF_INFO` is set to the original info text
     - ANSI color codes are supported
+- Pointer and marker signs can be set to empty strings
+  ```sh
+  # Minimal style
+  fzf --pointer '' --marker '' --info hidden
+
+  # When --read0 is specified, there can be multi-line entries,
+  # so you need to set --marker-multi-line to an empty string
+  find . -print0 | fzf --read0 --pointer '' --marker-multi-line '' --info hidden
+  ```
 - Better cache management and improved rendering for `--tail`
 - Improved `--sync` behavior
     - When `--sync` is provided, fzf will not render the interface until the initial filtering and the associated actions (bound to any of `start`, `load`, `result`, or `focus`) are complete.
diff --git a/src/options.go b/src/options.go
index 31f32b3d..fdf5f8dd 100644
--- a/src/options.go
+++ b/src/options.go
@@ -450,7 +450,7 @@ type Options struct {
 	Prompt       string
 	Pointer      *string
 	Marker       *string
-	MarkerMulti  [3]string
+	MarkerMulti  *[3]string
 	Query        string
 	Select1      bool
 	Exit0        bool
@@ -555,6 +555,7 @@ func defaultOptions() *Options {
 		Prompt:       "> ",
 		Pointer:      nil,
 		Marker:       nil,
+		MarkerMulti:  nil,
 		Query:        "",
 		Select1:      false,
 		Exit0:        false,
@@ -1862,7 +1863,10 @@ func parseMargin(opt string, margin string) ([4]sizeSpec, error) {
 	return [4]sizeSpec{}, errors.New("invalid " + opt + ": " + margin)
 }
 
-func parseMarkerMultiLine(str string) ([3]string, error) {
+func parseMarkerMultiLine(str string) (*[3]string, error) {
+	if str == "" {
+		return &[3]string{}, nil
+	}
 	gr := uniseg.NewGraphemes(str)
 	parts := []string{}
 	totalWidth := 0
@@ -1874,7 +1878,7 @@ func parseMarkerMultiLine(str string) ([3]string, error) {
 
 	result := [3]string{}
 	if totalWidth != 3 && totalWidth != 6 {
-		return result, fmt.Errorf("invalid total marker width: %d (expected: 3 or 6)", totalWidth)
+		return &result, fmt.Errorf("invalid total marker width: %d (expected: 0, 3 or 6)", totalWidth)
 	}
 
 	expected := totalWidth / 3
@@ -1890,7 +1894,7 @@ func parseMarkerMultiLine(str string) ([3]string, error) {
 			break
 		}
 	}
-	return result, nil
+	return &result, nil
 }
 
 func parseOptions(index *int, opts *Options, allArgs []string) error {
@@ -2699,9 +2703,6 @@ func parseOptions(index *int, opts *Options, allArgs []string) error {
 }
 
 func validateSign(sign string, signOptName string) error {
-	if sign == "" {
-		return fmt.Errorf("%v cannot be empty", signOptName)
-	}
 	if uniseg.StringWidth(sign) > 2 {
 		return fmt.Errorf("%v display width should be up to 2", signOptName)
 	}
@@ -2768,34 +2769,45 @@ func postProcessOptions(opts *Options) error {
 		opts.Pointer = &defaultPointer
 	}
 
+	multiLine := opts.MultiLine && opts.ReadZero
 	markerLen := 1
 	if opts.Marker == nil {
-		// "▎" looks better, but not all terminals render it correctly
-		defaultMarker := "┃"
-		if !opts.Unicode {
-			defaultMarker = ">"
+		if multiLine && opts.MarkerMulti != nil && opts.MarkerMulti[0] == "" {
+			empty := ""
+			opts.Marker = &empty
+			markerLen = 0
+		} else {
+			// "▎" looks better, but not all terminals render it correctly
+			defaultMarker := "┃"
+			if !opts.Unicode {
+				defaultMarker = ">"
+			}
+			opts.Marker = &defaultMarker
 		}
-		opts.Marker = &defaultMarker
 	} else {
 		markerLen = uniseg.StringWidth(*opts.Marker)
 	}
 
 	markerMultiLen := 1
-	if len(opts.MarkerMulti[0]) == 0 {
-		if opts.Unicode {
-			opts.MarkerMulti = [3]string{"╻", "┃", "╹"}
+	if opts.MarkerMulti == nil {
+		if !multiLine && *opts.Marker == "" {
+			opts.MarkerMulti = &[3]string{}
+			markerMultiLen = 0
+		} else if opts.Unicode {
+			opts.MarkerMulti = &[3]string{"╻", "┃", "╹"}
 		} else {
-			opts.MarkerMulti = [3]string{".", "|", "'"}
+			opts.MarkerMulti = &[3]string{".", "|", "'"}
 		}
 	} else {
 		markerMultiLen = uniseg.StringWidth(opts.MarkerMulti[0])
 	}
-	if markerMultiLen > markerLen {
-		padded := *opts.Marker + " "
+	diff := markerMultiLen - markerLen
+	if diff > 0 {
+		padded := *opts.Marker + strings.Repeat(" ", diff)
 		opts.Marker = &padded
-	} else if markerMultiLen < markerLen {
+	} else if diff < 0 {
 		for idx := range opts.MarkerMulti {
-			opts.MarkerMulti[idx] += " "
+			opts.MarkerMulti[idx] += strings.Repeat(" ", -diff)
 		}
 	}
 
diff --git a/src/terminal.go b/src/terminal.go
index 480fb31c..f131f1db 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -771,7 +771,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox, executor *util.Executor
 		pointerLen:         uniseg.StringWidth(*opts.Pointer),
 		marker:             *opts.Marker,
 		markerLen:          uniseg.StringWidth(*opts.Marker),
-		markerMultiLine:    opts.MarkerMulti,
+		markerMultiLine:    *opts.MarkerMulti,
 		wordRubout:         wordRubout,
 		wordNext:           wordNext,
 		cx:                 len(input),
diff --git a/test/test_go.rb b/test/test_go.rb
index 42d526aa..fdef78f7 100755
--- a/test/test_go.rb
+++ b/test/test_go.rb
@@ -3340,6 +3340,22 @@ class TestGoFZF < TestBase
     BLOCK
     tmux.until { assert_block(block, _1) }
   end
+
+  def test_fzf_multi_line_no_pointer_and_marker
+    tmux.send_keys %[(echo -en '0\\0'; echo -en '1\\n2\\0'; seq 1000) | fzf --read0 --multi --bind load:select-all --border rounded --reverse --pointer '' --marker '' --marker-multi-line ''], :Enter
+    block = <<~BLOCK
+      ╭───────────
+      │ >
+      │   3/3 (3)
+      │ 0
+      │ 1
+      │ 2
+      │ 1
+      │ 2
+      │ 3
+    BLOCK
+    tmux.until { assert_block(block, _1) }
+  end
 end
 
 module TestShell