Add 'noinfo' option to hide scroll offset information in preview window

fzf --preview 'seq 1000' --preview-window noinfo

Close #2525

4 files changed, 23 insertions, 6 deletions

diff --git a/man/man1/fzf.1 b/man/man1/fzf.1
index b605b59b..321327ab 100644
--- a/man/man1/fzf.1
+++ b/man/man1/fzf.1
@@ -21,7 +21,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ..
-.TH fzf 1 "Aug 2024" "fzf 0.55.0" "fzf - a command-line fuzzy finder"
+.TH fzf 1 "Sep 2024" "fzf 0.56.0" "fzf - a command-line fuzzy finder"
 
 .SH NAME
 fzf - a command-line fuzzy finder
@@ -756,7 +756,7 @@ default value 0 (or \fBcenter\fR) will put the label at the center of the
 border line.
 
 .TP
-.BI "\-\-preview\-window=" "[POSITION][,SIZE[%]][,border\-BORDER_OPT][,[no]wrap][,[no]follow][,[no]cycle][,[no]hidden][,+SCROLL[OFFSETS][/DENOM]][,~HEADER_LINES][,default][,<SIZE_THRESHOLD(ALTERNATIVE_LAYOUT)]"
+.BI "\-\-preview\-window=" "[POSITION][,SIZE[%]][,border\-BORDER_OPT][,[no]wrap][,[no]follow][,[no]cycle][,[no]info][,[no]hidden][,+SCROLL[OFFSETS][/DENOM]][,~HEADER_LINES][,default][,<SIZE_THRESHOLD(ALTERNATIVE_LAYOUT)]"
 
 .RS
 .B POSITION: (default: right)
@@ -790,6 +790,9 @@ e.g.
 
 * Cyclic scrolling is enabled with \fBcycle\fR flag.
 
+* To hide the scroll offset information on the top right corner, specify
+\fBnoinfo\fR.
+
 * To change the style of the border of the preview window, specify one of
 the options for \fB\-\-border\fR with \fBborder\-\fR prefix.
 e.g. \fBborder\-rounded\fR (border with rounded edges, default),
diff --git a/src/options.go b/src/options.go
index 55030bd2..67e70a70 100644
--- a/src/options.go
+++ b/src/options.go
@@ -120,8 +120,8 @@ Usage: fzf [options]
     --preview=COMMAND       Command to preview highlighted line ({})
     --preview-window=OPT    Preview window layout (default: right:50%)
                             [up|down|left|right][,SIZE[%]]
-                            [,[no]wrap][,[no]cycle][,[no]follow][,[no]hidden]
-                            [,border-BORDER_OPT]
+                            [,[no]wrap][,[no]cycle][,[no]follow][,[no]info]
+                            [,[no]hidden][,border-BORDER_OPT]
                             [,+SCROLL[OFFSETS][/DENOM]][,~HEADER_LINES]
                             [,default][,<SIZE_THRESHOLD(ALTERNATIVE_LAYOUT)]
     --preview-label=LABEL
@@ -271,6 +271,7 @@ type previewOpts struct {
 	wrap        bool
 	cycle       bool
 	follow      bool
+	info        bool
 	border      tui.BorderShape
 	headerLines int
 	threshold   int
@@ -508,7 +509,7 @@ func filterNonEmpty(input []string) []string {
 }
 
 func defaultPreviewOpts(command string) previewOpts {
-	return previewOpts{command, posRight, sizeSpec{50, true}, "", false, false, false, false, tui.DefaultBorderShape, 0, 0, nil}
+	return previewOpts{command, posRight, sizeSpec{50, true}, "", false, false, false, false, true, tui.DefaultBorderShape, 0, 0, nil}
 }
 
 func defaultOptions() *Options {
@@ -1789,6 +1790,10 @@ func parsePreviewWindowImpl(opts *previewOpts, input string) error {
 			opts.follow = true
 		case "nofollow":
 			opts.follow = false
+		case "info":
+			opts.info = true
+		case "noinfo":
+			opts.info = false
 		default:
 			if headerRegex.MatchString(token) {
 				if opts.headerLines, err = atoi(token[1:]); err != nil {
diff --git a/src/terminal.go b/src/terminal.go
index 1158de7a..535f5e3a 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -2507,7 +2507,7 @@ func (t *Terminal) renderPreviewSpinner() {
 	spin := t.previewer.spinner
 	if len(spin) > 0 || t.previewer.scrollable {
 		maxWidth := t.pwindow.Width()
-		if !t.previewer.scrollable {
+		if !t.previewer.scrollable || !t.previewOpts.info {
 			if maxWidth > 0 {
 				t.pwindow.Move(0, maxWidth-1)
 				t.pwindow.CPrint(tui.ColPreviewSpinner, spin)
diff --git a/test/test_go.rb b/test/test_go.rb
index ac294d62..1860ac1a 100755
--- a/test/test_go.rb
+++ b/test/test_go.rb
@@ -3378,6 +3378,15 @@ class TestGoFZF < TestBase
       assert_equal expected, result
     end
   end
+
+  def test_preview_window_noinfo
+    # │ 1        ││
+    tmux.send_keys %(#{FZF} --preview 'seq 1000' --preview-window top,noinfo --scrollbar), :Enter
+    tmux.until do |lines|
+      assert lines[1]&.start_with?('│ 1')
+      assert lines[1]&.end_with?('  ││')
+    end
+  end
 end
 
 module TestShell