Add replace-query action

replace-query action replaces the query string with the current
selection. If the selection is too long, it will be truncated.

If the line contains meta-characters of fzf search syntax, it is
possible that the line is no longer included in the updated result.

e.g.

  echo '!hello' | fzf --bind ctrl-v:replace-query

Close #1137

man/man1/fzf.1

@@ -525,6 +525,7 @@ triggered whenever the query string is changed.
     \fBpreview-page-up\fR
     \fBprevious-history\fR      (\fIctrl-p\fR on \fB--history\fR)
     \fBprint-query\fR           (print query and exit)
+    \fBreplace-query\fR         (replace query string with the current selection)
     \fBselect-all\fR
     \fBtoggle\fR                (\fIright-click\fR)
     \fBtoggle-all\fR

src/options.go

@@ -664,6 +664,8 @@ func parseKeymap(keymap map[int][]action, str string) {
 				appendAction(actAccept)
 			case "print-query":
 				appendAction(actPrintQuery)
+			case "replace-query":
+				appendAction(actReplaceQuery)
 			case "backward-char":
 				appendAction(actBackwardChar)
 			case "backward-delete-char":

src/terminal.go

@@ -203,6 +203,7 @@ const (
 	actJump
 	actJumpAccept
 	actPrintQuery
+	actReplaceQuery
 	actToggleSort
 	actTogglePreview
 	actTogglePreviewWrap
@@ -1568,6 +1569,11 @@ func (t *Terminal) Loop() {
 				}
 			case actPrintQuery:
 				req(reqPrintQuery)
+			case actReplaceQuery:
+				if t.cy < t.merger.Length() {
+					t.input = t.merger.Get(t.cy).item.text.ToRunes()
+					t.cx = len(t.input)
+				}
 			case actAbort:
 				req(reqQuit)
 			case actDeleteChar:

test/test_go.rb

@@ -769,6 +769,15 @@ class TestGoFZF < TestBase
     assert_equal %w[print-my-query], readonce.split($INPUT_RECORD_SEPARATOR)
   end
 
+  def test_bind_replace_query
+    tmux.send_keys "seq 1 1000 | #{fzf '--print-query --bind=ctrl-j:replace-query'}", :Enter
+    tmux.send_keys '1'
+    tmux.until { |lines| lines[-2].end_with? '272/1000' }
+    tmux.send_keys 'C-k', 'C-j'
+    tmux.until { |lines| lines[-2].end_with? '29/1000' }
+    tmux.until { |lines| lines[-1].end_with? '> 10' }
+  end
+
   def test_long_line
     data = '.' * 256 * 1024
     File.open(tempname, 'w') do |f|