Make search toggleable

- `--phony` renamed to `--disabled` for consistency
    - `--no-phony` is now `--enabled`
- Added `enable-search`, `disable-search`, and `toggle-search` actions
  for `--bind`
- Added `--color` options: `query` and `disabled`

Close #2303

10 files changed, 132 insertions, 49 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e650af9..69bab6a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 CHANGELOG
 =========
 
-0.24.5
+0.25.0
 ------
 - Text attributes set in `--color` are not reset when fzf sees another
   `--color` option for the same element. This allows you to put custom text
@@ -23,6 +23,13 @@ CHANGELOG
   # Write "regular" if you want to clear the attributes
   fzf --color hl:176:regular,hl+:177:regular
   ```
+- Renamed `--phony` to `--disabled`
+- You can dynamically enable and disable the search functionality using the
+  new `enable-search`, `disable-search`, and `toggle-search` actions
+- You can assign a different color to the query string for when search is disabled
+  ```sh
+  fzf --color query:#ffffff,disabled:#999999 --bind space:toggle-search
+  ```
 - Added `last` action to move the cursor to the last match
     - The opposite action `top` is renamed to `first`, but `top` is still
       recognized as a synonym for backward compatibility
diff --git a/README-VIM.md b/README-VIM.md
index ea588bbe..058dfaf1 100644
--- a/README-VIM.md
+++ b/README-VIM.md
@@ -171,19 +171,23 @@ list:
 
 - `element` is an fzf element to apply a color to:
 
-  | Element               | Description                                           |
-  | ---                   | ---                                                   |
-  | `fg`  / `bg`  / `hl`  | Item (foreground / background / highlight)            |
-  | `fg+` / `bg+` / `hl+` | Current item (foreground / background / highlight)    |
-  | `hl`  / `hl+`         | Highlighted substrings (normal / current)             |
-  | `gutter`              | Background of the gutter on the left                  |
-  | `pointer`             | Pointer to the current line (`>`)                     |
-  | `marker`              | Multi-select marker (`>`)                             |
-  | `border`              | Border around the window (`--border` and `--preview`) |
-  | `header`              | Header (`--header` or `--header-lines`)               |
-  | `info`                | Info line (match counters)                            |
-  | `spinner`             | Streaming input indicator                             |
-  | `prompt`              | Prompt before query (`> `)                            |
+  | Element                     | Description                                           |
+  | ---                         | ---                                                   |
+  | `fg`  / `bg`  / `hl`        | Item (foreground / background / highlight)            |
+  | `fg+` / `bg+` / `hl+`       | Current item (foreground / background / highlight)    |
+  | `preview-fg` / `preview-bg` | Preview window text and background                    |
+  | `hl`  / `hl+`               | Highlighted substrings (normal / current)             |
+  | `gutter`                    | Background of the gutter on the left                  |
+  | `pointer`                   | Pointer to the current line (`>`)                     |
+  | `marker`                    | Multi-select marker (`>`)                             |
+  | `border`                    | Border around the window (`--border` and `--preview`) |
+  | `header`                    | Header (`--header` or `--header-lines`)               |
+  | `info`                      | Info line (match counters)                            |
+  | `spinner`                   | Streaming input indicator                             |
+  | `query`                     | Query string                                          |
+  | `disabled`                  | Query string when search is disabled                  |
+  | `prompt`                    | Prompt before query (`> `)                            |
+  | `pointer`                   | Pointer to the current line (`>`)                     |
 
 - `component` specifies the component (`fg` / `bg`) from which to extract the
   color when considering each of the following highlight groups
diff --git a/doc/fzf.txt b/doc/fzf.txt
index f50a35ba..c8888962 100644
--- a/doc/fzf.txt
+++ b/doc/fzf.txt
@@ -1,4 +1,4 @@
-fzf.txt	fzf	Last change: December 31 2020
+fzf.txt	fzf	Last change: January 2 2021
 FZF - TABLE OF CONTENTS                                            *fzf* *fzf-toc*
 ==============================================================================
 
@@ -200,21 +200,25 @@ list:
 <
  - `element` is an fzf element to apply a color to:
 
- ----------------------+------------------------------------------------------
- Element               | Description                                          ~
- ----------------------+------------------------------------------------------
-  `fg`   /  `bg`   /  `hl`   | Item (foreground / background / highlight)
-  `fg+`  /  `bg+`  /  `hl+`  | Current item (foreground / background / highlight)
-  `hl`   /  `hl+`          | Highlighted substrings (normal / current)
-  `gutter`               | Background of the gutter on the left
-  `pointer`              | Pointer to the current line ( `>` )
-  `marker`               | Multi-select marker ( `>` )
-  `border`               | Border around the window ( `--border`  and  `--preview` )
-  `header`               | Header ( `--header`  or  `--header-lines` )
-  `info`                 | Info line (match counters)
-  `spinner`              | Streaming input indicator
-  `prompt`               | Prompt before query ( `> ` )
- ----------------------+------------------------------------------------------
+ ----------------------------+------------------------------------------------------
+ Element                     | Description                                          ~
+ ----------------------------+------------------------------------------------------
+  `fg`   /  `bg`   /  `hl`         | Item (foreground / background / highlight)
+  `fg+`  /  `bg+`  /  `hl+`        | Current item (foreground / background / highlight)
+  `preview-fg`  /  `preview-bg`  | Preview window text and background
+  `hl`   /  `hl+`                | Highlighted substrings (normal / current)
+  `gutter`                     | Background of the gutter on the left
+  `pointer`                    | Pointer to the current line ( `>` )
+  `marker`                     | Multi-select marker ( `>` )
+  `border`                     | Border around the window ( `--border`  and  `--preview` )
+  `header`                     | Header ( `--header`  or  `--header-lines` )
+  `info`                       | Info line (match counters)
+  `spinner`                    | Streaming input indicator
+  `query`                      | Query string
+  `disabled`                   | Query string when search is disabled
+  `prompt`                     | Prompt before query ( `> ` )
+  `pointer`                    | Pointer to the current line ( `>` )
+ ----------------------------+------------------------------------------------------
  - `component` specifies the component (`fg` / `bg`) from which to extract the
    color when considering each of the following highlight groups
  - `group1 [, group2, ...]` is a list of highlight groups that are searched (in
diff --git a/man/man1/fzf-tmux.1 b/man/man1/fzf-tmux.1
index f33fafa7..904fda34 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 "Dec 2020" "fzf 0.24.4" "fzf-tmux - open fzf in tmux split pane"
+.TH fzf-tmux 1 "Jan 2021" "fzf 0.25.0" "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 e976a5a2..5fff2e1c 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 "Dec 2020" "fzf 0.24.5" "fzf - a command-line fuzzy finder"
+.TH fzf 1 "Jan 2021" "fzf 0.25.0" "fzf - a command-line fuzzy finder"
 
 .SH NAME
 fzf - a command-line fuzzy finder
@@ -71,9 +71,10 @@ Transform the presentation of each line using field index expressions
 .BI "-d, --delimiter=" "STR"
 Field delimiter regex for \fB--nth\fR and \fB--with-nth\fR (default: AWK-style)
 .TP
-.BI "--phony"
+.BI "--disabled"
 Do not perform search. With this option, fzf becomes a simple selector
-interface rather than a "fuzzy finder".
+interface rather than a "fuzzy finder". You can later enable the search using
+\fBenable-search\fR or `\fBtoggle-search\R action.
 .SS Search result
 .TP
 .B "+s, --no-sort"
@@ -323,6 +324,8 @@ color mappings.
     \fBbg+        \fRBackground (current line)
     \fBgutter     \fRGutter on the left (defaults to \fBbg+\fR)
     \fBhl+        \fRHighlighted substrings (current line)
+    \fBquery      \fRQuery string
+    \fBdisabled   \fRQuery string when search is disabled
     \fBinfo       \fRInfo line (match counters)
     \fBborder     \fRBorder around the window (\fB--border\fR and \fB--preview\fR)
     \fBprompt     \fRPrompt
@@ -780,7 +783,9 @@ A key or an event can be bound to one or more of the following actions.
     \fBdelete-char\fR               \fIdel\fR
     \fBdelete-char/eof\fR           \fIctrl-d\fR (same as \fBdelete-char\fR except aborts fzf if query is empty)
     \fBdeselect-all\fR              (deselect all matches)
+    \fBdisable-search\fR            (disable search functionality)
     \fBdown\fR                      \fIctrl-j  ctrl-n  down\fR
+    \fBenable-search\fR             (enable search functionality)
     \fBend-of-line\fR               \fIctrl-e  end\fR
     \fBexecute(...)\fR              (see below for the details)
     \fBexecute-silent(...)\fR       (see below for the details)
@@ -820,6 +825,7 @@ A key or an event can be bound to one or more of the following actions.
     \fBtoggle-out\fR                (\fB--layout=reverse*\fR ? \fBtoggle+down\fR : \fBtoggle+up\fR)
     \fBtoggle-preview\fR
     \fBtoggle-preview-wrap\fR
+    \fBtoggle-search\fR             (toggle search functionality)
     \fBtoggle-sort\fR
     \fBtoggle+up\fR                 \fIbtab    (shift-tab)\fR
     \fBunix-line-discard\fR         \fIctrl-u\fR
@@ -902,7 +908,7 @@ e.g.
      INITIAL_QUERY="foobar"
      FZF_DEFAULT_COMMAND="$RG_PREFIX '$INITIAL_QUERY'" \\
        fzf --bind "change:reload:$RG_PREFIX {q} || true" \\
-           --ansi --phony --query "$INITIAL_QUERY"\fR
+           --ansi --disabled --query "$INITIAL_QUERY"\fR
 
 .SS PREVIEW BINDING
 
diff --git a/src/core.go b/src/core.go
index ef470a80..1c009c69 100644
--- a/src/core.go
+++ b/src/core.go
@@ -237,14 +237,16 @@ func Run(opts *Options, version string, revision string) {
 		go reader.restart(command)
 	}
 	eventBox.Watch(EvtReadNew)
+	query := []rune{}
 	for {
 		delay := true
 		ticks++
 		input := func() []rune {
-			if opts.Phony {
-				return []rune{}
+			paused, input := terminal.Input()
+			if !paused {
+				query = input
 			}
-			return []rune(terminal.Input())
+			return query
 		}
 		eventBox.Wait(func(events *util.Events) {
 			if _, fin := (*events)[EvtReadFin]; fin {
diff --git a/src/options.go b/src/options.go
index 691934ed..12c09556 100644
--- a/src/options.go
+++ b/src/options.go
@@ -33,7 +33,7 @@ const usage = `usage: fzf [options]
     -d, --delimiter=STR   Field delimiter regex (default: AWK-style)
     +s, --no-sort         Do not sort the result
     --tac                 Reverse the order of the input
-    --phony               Do not perform search
+    --disabled            Do not perform search
     --tiebreak=CRI[,..]   Comma-separated list of sort criteria to apply
                           when the scores are tied [length|begin|end|index]
                           (default: length)
@@ -682,8 +682,10 @@ func parseTheme(defaultTheme *tui.ColorTheme, str string) *tui.ColorTheme {
 				}
 			}
 			switch components[0] {
-			case "input":
+			case "query", "input":
 				mergeAttr(&theme.Input)
+			case "disabled":
+				mergeAttr(&theme.Disabled)
 			case "fg":
 				mergeAttr(&theme.Fg)
 			case "bg":
@@ -875,6 +877,8 @@ func parseKeymap(keymap map[tui.Event][]action, str string) {
 				appendAction(actToggleOut)
 			case "toggle-all":
 				appendAction(actToggleAll)
+			case "toggle-search":
+				appendAction(actToggleSearch)
 			case "select-all":
 				appendAction(actSelectAll)
 			case "deselect-all":
@@ -923,6 +927,10 @@ func parseKeymap(keymap map[tui.Event][]action, str string) {
 				appendAction(actPreviewHalfPageUp)
 			case "preview-half-page-down":
 				appendAction(actPreviewHalfPageDown)
+			case "enable-search":
+				appendAction(actEnableSearch)
+			case "disable-search":
+				appendAction(actDisableSearch)
 			default:
 				t := isExecuteAction(specLower)
 				if t == actIgnore {
@@ -1199,9 +1207,9 @@ func parseOptions(opts *Options, allArgs []string) {
 			}
 		case "--no-expect":
 			opts.Expect = make(map[tui.Event]string)
-		case "--no-phony":
+		case "--enabled", "--no-phony":
 			opts.Phony = false
-		case "--phony":
+		case "--disabled", "--phony":
 			opts.Phony = true
 		case "--tiebreak":
 			opts.Criteria = parseTiebreak(nextString(allArgs, &i, "sort criterion required"))
diff --git a/src/terminal.go b/src/terminal.go
index e630db4e..48011628 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -125,6 +125,7 @@ type Terminal struct {
 	unicode      bool
 	borderShape  tui.BorderShape
 	cleanExit    bool
+	paused       bool
 	border       tui.Window
 	window       tui.Window
 	pborder      tui.Window
@@ -233,6 +234,7 @@ const (
 	actSelectAll
 	actDeselectAll
 	actToggle
+	actToggleSearch
 	actToggleAll
 	actToggleDown
 	actToggleUp
@@ -270,6 +272,8 @@ const (
 	actFirst
 	actLast
 	actReload
+	actDisableSearch
+	actEnableSearch
 )
 
 type placeholderFlags struct {
@@ -488,6 +492,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		unicode:     opts.Unicode,
 		borderShape: opts.BorderShape,
 		cleanExit:   opts.ClearOnExit,
+		paused:      opts.Phony,
 		strong:      strongAttr,
 		cycle:       opts.Cycle,
 		header:      header,
@@ -563,10 +568,10 @@ func (t *Terminal) noInfoLine() bool {
 }
 
 // Input returns current query string
-func (t *Terminal) Input() []rune {
+func (t *Terminal) Input() (bool, []rune) {
 	t.mutex.Lock()
 	defer t.mutex.Unlock()
-	return copySlice(t.input)
+	return t.paused, copySlice(t.input)
 }
 
 // UpdateCount updates the count information
@@ -925,8 +930,12 @@ func (t *Terminal) printPrompt() {
 	t.prompt()
 
 	before, after := t.updatePromptOffset()
-	t.window.CPrint(tui.ColInput, string(before))
-	t.window.CPrint(tui.ColInput, string(after))
+	color := tui.ColInput
+	if t.paused {
+		color = tui.ColDisabled
+	}
+	t.window.CPrint(color, string(before))
+	t.window.CPrint(color, string(after))
 }
 
 func (t *Terminal) trimMessage(message string, maxWidth int) string {
@@ -1880,7 +1889,8 @@ func (t *Terminal) Loop() {
 				version++
 				// We don't display preview window if no match
 				if items[0] != nil {
-					command := t.replacePlaceholder(commandTemplate, false, string(t.Input()), items)
+					_, query := t.Input()
+					command := t.replacePlaceholder(commandTemplate, false, string(query), items)
 					initialOffset := 0
 					cmd := util.ExecCommand(command, true)
 					if pwindow != nil {
@@ -2465,6 +2475,17 @@ func (t *Terminal) Loop() {
 					t.input = trimQuery(t.history.next())
 					t.cx = len(t.input)
 				}
+			case actToggleSearch:
+				t.paused = !t.paused
+				changed = !t.paused
+				req(reqPrompt)
+			case actEnableSearch:
+				t.paused = false
+				changed = true
+				req(reqPrompt)
+			case actDisableSearch:
+				t.paused = true
+				req(reqPrompt)
 			case actSigStop:
 				p, err := os.FindProcess(os.Getpid())
 				if err == nil {
diff --git a/src/tui/tui.go b/src/tui/tui.go
index cc9c7f67..eb09da40 100644
--- a/src/tui/tui.go
+++ b/src/tui/tui.go
@@ -250,6 +250,7 @@ func (p ColorPair) MergeNonDefault(other ColorPair) ColorPair {
 type ColorTheme struct {
 	Colored      bool
 	Input        ColorAttr
+	Disabled     ColorAttr
 	Fg           ColorAttr
 	Bg           ColorAttr
 	PreviewFg    ColorAttr
@@ -421,6 +422,7 @@ var (
 	ColPrompt               ColorPair
 	ColNormal               ColorPair
 	ColInput                ColorPair
+	ColDisabled             ColorPair
 	ColMatch                ColorPair
 	ColCursor               ColorPair
 	ColCursorEmpty          ColorPair
@@ -443,6 +445,7 @@ func EmptyTheme() *ColorTheme {
 	return &ColorTheme{
 		Colored:      true,
 		Input:        ColorAttr{colUndefined, AttrUndefined},
+		Disabled:     ColorAttr{colUndefined, AttrUndefined},
 		Fg:           ColorAttr{colUndefined, AttrUndefined},
 		Bg:           ColorAttr{colUndefined, AttrUndefined},
 		PreviewFg:    ColorAttr{colUndefined, AttrUndefined},
@@ -465,6 +468,7 @@ func NoColorTheme() *ColorTheme {
 	return &ColorTheme{
 		Colored:      false,
 		Input:        ColorAttr{colDefault, AttrRegular},
+		Disabled:     ColorAttr{colDefault, AttrRegular},
 		Fg:           ColorAttr{colDefault, AttrRegular},
 		Bg:           ColorAttr{colDefault, AttrRegular},
 		PreviewFg:    ColorAttr{colDefault, AttrRegular},
@@ -492,6 +496,7 @@ func init() {
 	Default16 = &ColorTheme{
 		Colored:      true,
 		Input:        ColorAttr{colDefault, AttrUndefined},
+		Disabled:     ColorAttr{colUndefined, AttrUndefined},
 		Fg:           ColorAttr{colDefault, AttrUndefined},
 		Bg:           ColorAttr{colDefault, AttrUndefined},
 		PreviewFg:    ColorAttr{colUndefined, AttrUndefined},
@@ -511,6 +516,7 @@ func init() {
 	Dark256 = &ColorTheme{
 		Colored:      true,
 		Input:        ColorAttr{colDefault, AttrUndefined},
+		Disabled:     ColorAttr{colUndefined, AttrUndefined},
 		Fg:           ColorAttr{colDefault, AttrUndefined},
 		Bg:           ColorAttr{colDefault, AttrUndefined},
 		PreviewFg:    ColorAttr{colUndefined, AttrUndefined},
@@ -530,6 +536,7 @@ func init() {
 	Light256 = &ColorTheme{
 		Colored:      true,
 		Input:        ColorAttr{colDefault, AttrUndefined},
+		Disabled:     ColorAttr{colUndefined, AttrUndefined},
 		Fg:           ColorAttr{colDefault, AttrUndefined},
 		Bg:           ColorAttr{colDefault, AttrUndefined},
 		PreviewFg:    ColorAttr{colUndefined, AttrUndefined},
@@ -564,6 +571,7 @@ func initTheme(theme *ColorTheme, baseTheme *ColorTheme, forceBlack bool) {
 		return c
 	}
 	theme.Input = o(baseTheme.Input, theme.Input)
+	theme.Disabled = o(theme.Input, o(baseTheme.Disabled, theme.Disabled))
 	theme.Fg = o(baseTheme.Fg, theme.Fg)
 	theme.Bg = o(baseTheme.Bg, theme.Bg)
 	theme.PreviewFg = o(theme.Fg, o(baseTheme.PreviewFg, theme.PreviewFg))
@@ -597,6 +605,7 @@ func initPalette(theme *ColorTheme) {
 	ColPrompt = pair(theme.Prompt, theme.Bg)
 	ColNormal = pair(theme.Fg, theme.Bg)
 	ColInput = pair(theme.Input, theme.Bg)
+	ColDisabled = pair(theme.Disabled, theme.Bg)
 	ColMatch = pair(theme.Match, theme.Bg)
 	ColCursor = pair(theme.Cursor, theme.Gutter)
 	ColCursorEmpty = pair(blank, theme.Gutter)
diff --git a/test/test_go.rb b/test/test_go.rb
index f1456751..aa28e1ce 100755
--- a/test/test_go.rb
+++ b/test/test_go.rb
@@ -1658,13 +1658,35 @@ class TestGoFZF < TestBase
     tmux.until { |lines| assert_includes lines[1], ' +       green ' }
   end
 
-  def test_phony
-    tmux.send_keys %(seq 1000 | #{FZF} --query 333 --phony --preview 'echo {} {q}'), :Enter
+  def test_disabled
+    tmux.send_keys %(seq 1000 | #{FZF} --query 333 --disabled --bind a:enable-search,b:disable-search,c:toggle-search --preview 'echo {} {q}'), :Enter
     tmux.until { |lines| assert_equal 1000, lines.match_count }
     tmux.until { |lines| assert_includes lines[1], ' 1 333 ' }
     tmux.send_keys 'foo'
     tmux.until { |lines| assert_equal 1000, lines.match_count }
     tmux.until { |lines| assert_includes lines[1], ' 1 333foo ' }
+
+    # Already disabled, no change
+    tmux.send_keys 'b'
+    tmux.until { |lines| assert_equal 1000, lines.match_count }
+
+    # Enable search
+    tmux.send_keys 'a'
+    tmux.until { |lines| assert_equal 0, lines.match_count }
+    tmux.send_keys :BSpace, :BSpace, :BSpace
+    tmux.until { |lines| assert_equal 1, lines.match_count }
+    tmux.until { |lines| assert_includes lines[1], ' 333 333 ' }
+
+    # Toggle search -> disabled again, but retains the previous result
+    tmux.send_keys 'c'
+    tmux.send_keys 'foo'
+    tmux.until { |lines| assert_includes lines[1], ' 333 333foo ' }
+    tmux.until { |lines| assert_equal 1, lines.match_count }
+
+    # Enabled, no match
+    tmux.send_keys 'c'
+    tmux.until { |lines| assert_equal 0, lines.match_count }
+    tmux.until { |lines| assert_includes lines[1], ' 333foo ' }
   end
 
   def test_reload