Add backward-eof event for --bind

man/man1/fzf.1

@@ -635,12 +635,23 @@ e.g.
 or any single character
 
 .SS AVAILABLE EVENTS:
-\fIchange\fR (triggered whenever the query string is changed)
-.br
+\fIchange\fR
+.RS
+Triggered whenever the query string is changed
 
-    e.g.
-         \fB# Moves cursor to the top (or bottom depending on --layout) whenever the query is changed
-         fzf --bind change:top\fR
+e.g.
+     \fB# Moves cursor to the top (or bottom depending on --layout) whenever the query is changed
+     fzf --bind change:top\fR
+.RE
+
+\fIbackward-eof\fR
+.RS
+Triggered when the query string is already empty and you try to delete it
+backward.
+
+e.g.
+     \fBfzf --bind backward-eof:abort\fR
+.RE
 
 .SS AVAILABLE ACTIONS:
 A key or an event can be bound to one or more of the following actions.

src/options.go

@@ -464,6 +464,8 @@ func parseKeyChords(str string, message string) map[int]string {
 			chord = tui.CtrlRightBracket
 		case "change":
 			chord = tui.Change
+		case "backward-eof":
+			chord = tui.BackwardEOF
 		case "alt-enter", "alt-return":
 			chord = tui.CtrlAltM
 		case "alt-space":

src/terminal.go

@@ -1738,6 +1738,7 @@ func (t *Terminal) Loop() {
 	for looping {
 		var newCommand *string
 		changed := false
+		beof := false
 		queryChanged := false
 
 		event := t.tui.GetChar()
@@ -1881,6 +1882,7 @@ func (t *Terminal) Loop() {
 					t.cx++
 				}
 			case actBackwardDeleteChar:
+				beof = len(t.input) == 0
 				if t.cx > 0 {
 					t.input = append(t.input[:t.cx-1], t.input[t.cx:]...)
 					t.cx--
@@ -1973,16 +1975,19 @@ func (t *Terminal) Loop() {
 				t.vset(0)
 				req(reqList)
 			case actUnixLineDiscard:
+				beof = len(t.input) == 0
 				if t.cx > 0 {
 					t.yanked = copySlice(t.input[:t.cx])
 					t.input = t.input[t.cx:]
 					t.cx = 0
 				}
 			case actUnixWordRubout:
+				beof = len(t.input) == 0
 				if t.cx > 0 {
 					t.rubout("\\s\\S")
 				}
 			case actBackwardKillWord:
+				beof = len(t.input) == 0
 				if t.cx > 0 {
 					t.rubout(t.wordRubout)
 				}
@@ -2145,6 +2150,11 @@ func (t *Terminal) Loop() {
 					continue
 				}
 			}
+			if onEOFs, prs := t.keymap[tui.BackwardEOF]; beof && prs {
+				if !doActions(onEOFs, tui.BackwardEOF) {
+					continue
+				}
+			}
 		} else {
 			if mapkey == tui.Rune {
 				if idx := strings.IndexRune(t.jumpLabels, event.Char); idx >= 0 && idx < t.maxItems() && idx < t.merger.Length() {

src/tui/tui.go

@@ -87,6 +87,7 @@ const (
 	F12
 
 	Change
+	BackwardEOF
 
 	AltSpace
 	AltSlash

test/test_go.rb

@@ -1746,6 +1746,17 @@ class TestGoFZF < TestBase
     tmux.send_keys "seq 10000 | #{FZF} --read0 --keep-right", :Enter
     tmux.until { |lines| assert lines.any_include?('9999 10000') }
   end
+
+  def test_backward_eof
+    tmux.send_keys "echo foo | #{FZF} --bind 'backward-eof:reload(seq 100)'", :Enter
+    tmux.until { |lines| lines.item_count == 1 && lines.match_count == 1 }
+    tmux.send_keys 'x'
+    tmux.until { |lines| lines.item_count == 1 && lines.match_count == 0 }
+    tmux.send_keys :BSpace
+    tmux.until { |lines| lines.item_count == 1 && lines.match_count == 1 }
+    tmux.send_keys :BSpace
+    tmux.until { |lines| lines.item_count == 100 && lines.match_count == 100 }
+  end
 end
 
 module TestShell