Add `rebind` action for restoring bindings after `unbind`

Fix #2752
Close #2564

7 files changed, 39 insertions, 11 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 061bf857..77582a94 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ CHANGELOG
     fzf --nth=-1 --no-hscroll --ellipsis='' |
     awk '{print $2}'
   ```
+- Added `rebind` action for restoring bindings after `unbind`
 - Bug fixes and improvements
 
 0.29.0
diff --git a/man/man1/fzf-tmux.1 b/man/man1/fzf-tmux.1
index d34edb40..5667c7f1 100644
--- a/man/man1/fzf-tmux.1
+++ b/man/man1/fzf-tmux.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-tmux 1 "Mar 2022" "fzf 0.30.0" "fzf-tmux - open fzf in tmux split pane"
+.TH fzf-tmux 1 "Apr 2022" "fzf 0.30.0" "fzf-tmux - open fzf in tmux split pane"
 
 .SH NAME
 fzf-tmux - open fzf in tmux split pane
diff --git a/man/man1/fzf.1 b/man/man1/fzf.1
index d5b35390..906ab199 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 "Mar 2022" "fzf 0.30.0" "fzf - a command-line fuzzy finder"
+.TH fzf 1 "Apr 2022" "fzf 0.30.0" "fzf - a command-line fuzzy finder"
 
 .SH NAME
 fzf - a command-line fuzzy finder
@@ -867,6 +867,7 @@ A key or an event can be bound to one or more of the following actions.
     \fBprint-query\fR                (print query and exit)
     \fBput\fR                        (put the character to the prompt)
     \fBrefresh-preview\fR
+    \fBrebind(...)\fR                (rebind bindings after \fBunbind\fR)
     \fBreload(...)\fR                (see below for the details)
     \fBreplace-query\fR              (replace query string with the current selection)
     \fBselect\fR
diff --git a/src/core.go b/src/core.go
index 6244c99a..17198f5b 100644
--- a/src/core.go
+++ b/src/core.go
@@ -242,9 +242,11 @@ func Run(opts *Options, version string, revision string) {
 	for {
 		delay := true
 		ticks++
-		input := func() []rune {
+		input := func(reloaded bool) []rune {
 			paused, input := terminal.Input()
-			if !paused {
+			if reloaded && paused {
+				query = []rune{}
+			} else if !paused {
 				query = input
 			}
 			return query
@@ -274,7 +276,8 @@ func Run(opts *Options, version string, revision string) {
 						opts.Sync = false
 						terminal.UpdateList(PassMerger(&snapshot, opts.Tac), false)
 					}
-					matcher.Reset(snapshot, input(), false, !reading, sort, clearCache())
+					reset := clearCache()
+					matcher.Reset(snapshot, input(reset), false, !reading, sort, reset)
 
 				case EvtSearchNew:
 					var command *string
@@ -293,7 +296,8 @@ func Run(opts *Options, version string, revision string) {
 						break
 					}
 					snapshot, _ := chunkList.Snapshot()
-					matcher.Reset(snapshot, input(), true, !reading, sort, clearCache())
+					reset := clearCache()
+					matcher.Reset(snapshot, input(reset), true, !reading, sort, reset)
 					delay = false
 
 				case EvtSearchProgress:
diff --git a/src/options.go b/src/options.go
index cc77143d..b0afacda 100644
--- a/src/options.go
+++ b/src/options.go
@@ -798,7 +798,7 @@ func init() {
 	// Backreferences are not supported.
 	// "~!@#$%^&*;/|".each_char.map { |c| Regexp.escape(c) }.map { |c| "#{c}[^#{c}]*#{c}" }.join('|')
 	executeRegexp = regexp.MustCompile(
-		`(?si)[:+](execute(?:-multi|-silent)?|reload|preview|change-prompt|change-preview-window|change-preview|unbind):.+|[:+](execute(?:-multi|-silent)?|reload|preview|change-prompt|change-preview-window|change-preview|unbind)(\([^)]*\)|\[[^\]]*\]|~[^~]*~|![^!]*!|@[^@]*@|\#[^\#]*\#|\$[^\$]*\$|%[^%]*%|\^[^\^]*\^|&[^&]*&|\*[^\*]*\*|;[^;]*;|/[^/]*/|\|[^\|]*\|)`)
+		`(?si)[:+](execute(?:-multi|-silent)?|reload|preview|change-prompt|change-preview-window|change-preview|(?:re|un)bind):.+|[:+](execute(?:-multi|-silent)?|reload|preview|change-prompt|change-preview-window|change-preview|(?:re|un)bind)(\([^)]*\)|\[[^\]]*\]|~[^~]*~|![^!]*!|@[^@]*@|\#[^\#]*\#|\$[^\$]*\$|%[^%]*%|\^[^\^]*\^|&[^&]*&|\*[^\*]*\*|;[^;]*;|/[^/]*/|\|[^\|]*\|)`)
 }
 
 func parseKeymap(keymap map[tui.Event][]*action, str string) {
@@ -818,6 +818,8 @@ func parseKeymap(keymap map[tui.Event][]*action, str string) {
 			prefix = symbol + "preview"
 		} else if strings.HasPrefix(src[1:], "unbind") {
 			prefix = symbol + "unbind"
+		} else if strings.HasPrefix(src[1:], "rebind") {
+			prefix = symbol + "rebind"
 		} else if strings.HasPrefix(src[1:], "change-prompt") {
 			prefix = symbol + "change-prompt"
 		} else if src[len(prefix)] == '-' {
@@ -1025,6 +1027,8 @@ func parseKeymap(keymap map[tui.Event][]*action, str string) {
 						offset = len("change-prompt")
 					case actUnbind:
 						offset = len("unbind")
+					case actRebind:
+						offset = len("rebind")
 					case actExecuteSilent:
 						offset = len("execute-silent")
 					case actExecuteMulti:
@@ -1045,8 +1049,8 @@ func parseKeymap(keymap map[tui.Event][]*action, str string) {
 						actionArg = spec[offset+1 : len(spec)-1]
 						actions = append(actions, &action{t: t, a: actionArg})
 					}
-					if t == actUnbind {
-						parseKeyChords(actionArg, "unbind target required")
+					if t == actUnbind || t == actRebind {
+						parseKeyChords(actionArg, spec[0:offset]+" target required")
 					} else if t == actChangePreviewWindow {
 						opts := previewOpts{}
 						for _, arg := range strings.Split(actionArg, "|") {
@@ -1075,6 +1079,8 @@ func isExecuteAction(str string) actionType {
 		return actReload
 	case "unbind":
 		return actUnbind
+	case "rebind":
+		return actRebind
 	case "preview":
 		return actPreview
 	case "change-preview-window":
diff --git a/src/terminal.go b/src/terminal.go
index 7800714b..90d2807a 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -136,6 +136,7 @@ type Terminal struct {
 	delimiter          Delimiter
 	expect             map[tui.Event]string
 	keymap             map[tui.Event][]*action
+	keymapOrg          map[tui.Event][]*action
 	pressed            string
 	printQuery         bool
 	history            *History
@@ -313,6 +314,7 @@ const (
 	actSelect
 	actDeselect
 	actUnbind
+	actRebind
 )
 
 type placeholderFlags struct {
@@ -501,6 +503,10 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		wordRubout = fmt.Sprintf("%s[^%s]", sep, sep)
 		wordNext = fmt.Sprintf("[^%s]%s|(.$)", sep, sep)
 	}
+	keymapCopy := make(map[tui.Event][]*action)
+	for key, action := range opts.Keymap {
+		keymapCopy[key] = action
+	}
 	t := Terminal{
 		initDelay:          delay,
 		infoStyle:          opts.InfoStyle,
@@ -526,6 +532,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		delimiter:          opts.Delimiter,
 		expect:             opts.Expect,
 		keymap:             opts.Keymap,
+		keymapOrg:          keymapCopy,
 		pressed:            "",
 		printQuery:         opts.PrintQuery,
 		history:            opts.History,
@@ -2734,6 +2741,13 @@ func (t *Terminal) Loop() {
 				for key := range keys {
 					delete(t.keymap, key)
 				}
+			case actRebind:
+				keys := parseKeyChords(a.a, "PANIC")
+				for key := range keys {
+					if originalAction, found := t.keymapOrg[key]; found {
+						t.keymap[key] = originalAction
+					}
+				}
 			case actChangePreview:
 				if t.previewOpts.command != a.a {
 					togglePreview(len(a.a) > 0)
diff --git a/test/test_go.rb b/test/test_go.rb
index 74f9851a..3050fa0a 100755
--- a/test/test_go.rb
+++ b/test/test_go.rb
@@ -2043,8 +2043,8 @@ class TestGoFZF < TestBase
     tmux.until { |lines| assert_equal(%w[1 2 3 4 5], top5[lines]) }
   end
 
-  def test_unbind
-    tmux.send_keys "seq 100 | #{FZF} --bind 'c:clear-query,d:unbind(c,d)'", :Enter
+  def test_unbind_rebind
+    tmux.send_keys "seq 100 | #{FZF} --bind 'c:clear-query,d:unbind(c,d),e:rebind(c,d)'", :Enter
     tmux.until { |lines| assert_equal 100, lines.item_count }
     tmux.send_keys 'ab'
     tmux.until { |lines| assert_equal '> ab', lines[-1] }
@@ -2052,6 +2052,8 @@ class TestGoFZF < TestBase
     tmux.until { |lines| assert_equal '>', lines[-1] }
     tmux.send_keys 'dabcd'
     tmux.until { |lines| assert_equal '> abcd', lines[-1] }
+    tmux.send_keys 'ecabddc'
+    tmux.until { |lines| assert_equal '> abdc', lines[-1] }
   end
 
   def test_item_index_reset_on_reload