Add bind action for executing arbitrary command (#265)

e.g. fzf --bind "ctrl-m:execute(less {})"
     fzf --bind "ctrl-t:execute[tmux new-window -d 'vim {}']"

src/item.go

@@ -86,10 +86,15 @@ func (i *Item) Rank(cache bool) Rank {
 
 // AsString returns the original string
 func (i *Item) AsString() string {
+	return *i.StringPtr()
+}
+
+// StringPtr returns the pointer to the original string
+func (i *Item) StringPtr() *string {
 	if i.origText != nil {
-		return *i.origText
+		return i.origText
 	}
-	return *i.text
+	return i.text
 }
 
 func (item *Item) colorOffsets(color int, bold bool, current bool) []colorOffset {

src/options.go

@@ -117,6 +117,7 @@ type Options struct {
 	ToggleSort bool
 	Expect     []int
 	Keymap     map[int]actionType
+	Execmap    map[int]string
 	PrintQuery bool
 	ReadZero   bool
 	Sync       bool
@@ -157,6 +158,7 @@ func defaultOptions() *Options {
 		ToggleSort: false,
 		Expect:     []int{},
 		Keymap:     defaultKeymap(),
+		Execmap:    make(map[int]string),
 		PrintQuery: false,
 		ReadZero:   false,
 		Sync:       false,
@@ -375,12 +377,22 @@ func parseTheme(defaultTheme *curses.ColorTheme, str string) *curses.ColorTheme
 	return theme
 }
 
-func parseKeymap(keymap map[int]actionType, toggleSort bool, str string) (map[int]actionType, bool) {
-	for _, pairStr := range strings.Split(str, ",") {
+func parseKeymap(keymap map[int]actionType, execmap map[int]string, toggleSort bool, str string) (map[int]actionType, map[int]string, bool) {
+	rx := regexp.MustCompile(
+		":execute(\\([^)]*\\)|\\[[^\\]]*\\]|/[^/]*/|:[^:]*:|;[^;]*;|@[^@]*@|~[^~]*~|%[^%]*%|\\?[^?]*\\?)")
+	masked := rx.ReplaceAllStringFunc(str, func(src string) string {
+		return ":execute(" + strings.Repeat(" ", len(src)-10) + ")"
+	})
+
+	idx := 0
+	for _, pairStr := range strings.Split(masked, ",") {
+		pairStr = str[idx : idx+len(pairStr)]
+		idx += len(pairStr) + 1
+
 		fail := func() {
 			errorExit("invalid key binding: " + pairStr)
 		}
-		pair := strings.Split(pairStr, ":")
+		pair := strings.SplitN(pairStr, ":", 2)
 		if len(pair) != 2 {
 			fail()
 		}
@@ -455,10 +467,28 @@ func parseKeymap(keymap map[int]actionType, toggleSort bool, str string) (map[in
 			keymap[key] = actToggleSort
 			toggleSort = true
 		default:
-			errorExit("unknown action: " + act)
+			if isExecuteAction(act) {
+				keymap[key] = actExecute
+				execmap[key] = pair[1][8 : len(act)-1]
+			} else {
+				errorExit("unknown action: " + act)
+			}
 		}
 	}
-	return keymap, toggleSort
+	return keymap, execmap, toggleSort
+}
+
+func isExecuteAction(str string) bool {
+	if !strings.HasPrefix(str, "execute") || len(str) < 9 {
+		return false
+	}
+	b := str[7]
+	e := str[len(str)-1]
+	if b == e && strings.ContainsAny(string(b), "/:;@~%?") ||
+		b == '(' && e == ')' || b == '[' && e == ']' {
+		return true
+	}
+	return false
 }
 
 func checkToggleSort(keymap map[int]actionType, str string) map[int]actionType {
@@ -515,7 +545,8 @@ func parseOptions(opts *Options, allArgs []string) {
 		case "--tiebreak":
 			opts.Tiebreak = parseTiebreak(nextString(allArgs, &i, "sort criterion required"))
 		case "--bind":
-			keymap, opts.ToggleSort = parseKeymap(keymap, opts.ToggleSort, nextString(allArgs, &i, "bind expression required"))
+			keymap, opts.Execmap, opts.ToggleSort =
+				parseKeymap(keymap, opts.Execmap, opts.ToggleSort, nextString(allArgs, &i, "bind expression required"))
 		case "--color":
 			spec := optionalNextString(allArgs, &i)
 			if len(spec) == 0 {
@@ -629,7 +660,8 @@ func parseOptions(opts *Options, allArgs []string) {
 			} else if match, value := optString(arg, "--color="); match {
 				opts.Theme = parseTheme(opts.Theme, value)
 			} else if match, value := optString(arg, "--bind="); match {
-				keymap, opts.ToggleSort = parseKeymap(keymap, opts.ToggleSort, value)
+				keymap, opts.Execmap, opts.ToggleSort =
+					parseKeymap(keymap, opts.Execmap, opts.ToggleSort, value)
 			} else if match, value := optString(arg, "--history="); match {
 				setHistory(value)
 			} else if match, value := optString(arg, "--history-max="); match {

src/options_test.go

@@ -136,11 +136,19 @@ func TestBind(t *testing.T) {
 			t.Errorf("%d != %d", action, expected)
 		}
 	}
+	checkString := func(action string, expected string) {
+		if action != expected {
+			t.Errorf("%d != %d", action, expected)
+		}
+	}
 	keymap := defaultKeymap()
+	execmap := make(map[int]string)
 	check(actBeginningOfLine, keymap[curses.CtrlA])
-	keymap, toggleSort :=
-		parseKeymap(keymap, false,
-			"ctrl-a:kill-line,ctrl-b:toggle-sort,c:page-up,alt-z:page-down")
+	keymap, execmap, toggleSort :=
+		parseKeymap(keymap, execmap, false,
+			"ctrl-a:kill-line,ctrl-b:toggle-sort,c:page-up,alt-z:page-down,"+
+				"f1:execute(ls {}),f2:execute/echo {}, {}, {}/,f3:execute[echo '({})'],f4:execute:less {}:,"+
+				"alt-a:execute@echo (,),[,],/,:,;,%,{}@,alt-b:execute;echo (,),[,],/,:,@,%,{};")
 	if !toggleSort {
 		t.Errorf("toggleSort not set")
 	}
@@ -148,8 +156,18 @@ func TestBind(t *testing.T) {
 	check(actToggleSort, keymap[curses.CtrlB])
 	check(actPageUp, keymap[curses.AltZ+'c'])
 	check(actPageDown, keymap[curses.AltZ])
-
-	keymap, toggleSort = parseKeymap(keymap, false, "f1:abort")
+	check(actExecute, keymap[curses.F1])
+	check(actExecute, keymap[curses.F2])
+	check(actExecute, keymap[curses.F3])
+	check(actExecute, keymap[curses.F4])
+	checkString("ls {}", execmap[curses.F1])
+	checkString("echo {}, {}, {}", execmap[curses.F2])
+	checkString("echo '({})'", execmap[curses.F3])
+	checkString("less {}", execmap[curses.F4])
+	checkString("echo (,),[,],/,:,;,%,{}", execmap[curses.AltA])
+	checkString("echo (,),[,],/,:,@,%,{}", execmap[curses.AltB])
+
+	keymap, execmap, toggleSort = parseKeymap(keymap, execmap, false, "f1:abort")
 	if toggleSort {
 		t.Errorf("toggleSort set")
 	}

src/terminal.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"os"
+	"os/exec"
 	"os/signal"
 	"regexp"
 	"sort"
@@ -34,6 +35,7 @@ type Terminal struct {
 	toggleSort bool
 	expect     []int
 	keymap     map[int]actionType
+	execmap    map[int]string
 	pressed    int
 	printQuery bool
 	history    *History
@@ -119,6 +121,7 @@ const (
 	actToggleSort
 	actPreviousHistory
 	actNextHistory
+	actExecute
 )
 
 func defaultKeymap() map[int]actionType {
@@ -187,6 +190,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 		toggleSort: opts.ToggleSort,
 		expect:     opts.Expect,
 		keymap:     opts.Keymap,
+		execmap:    opts.Execmap,
 		pressed:    0,
 		printQuery: opts.PrintQuery,
 		history:    opts.History,
@@ -587,6 +591,17 @@ func keyMatch(key int, event C.Event) bool {
 	return event.Type == key || event.Type == C.Rune && int(event.Char) == key-C.AltZ
 }
 
+func executeCommand(template string, current string) {
+	command := strings.Replace(template, "{}", fmt.Sprintf("%q", current), -1)
+	cmd := exec.Command("sh", "-c", command)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	C.Endwin()
+	cmd.Run()
+	C.Refresh()
+}
+
 // Loop is called to start Terminal I/O
 func (t *Terminal) Loop() {
 	<-t.startChan
@@ -677,13 +692,7 @@ func (t *Terminal) Loop() {
 		}
 		selectItem := func(item *Item) bool {
 			if _, found := t.selected[item.index]; !found {
-				var strptr *string
-				if item.origText != nil {
-					strptr = item.origText
-				} else {
-					strptr = item.text
-				}
-				t.selected[item.index] = selectedItem{time.Now(), strptr}
+				t.selected[item.index] = selectedItem{time.Now(), item.StringPtr()}
 				return true
 			}
 			return false
@@ -709,14 +718,20 @@ func (t *Terminal) Loop() {
 		}
 
 		action := t.keymap[event.Type]
+		mapkey := event.Type
 		if event.Type == C.Rune {
-			code := int(event.Char) + int(C.AltZ)
-			if act, prs := t.keymap[code]; prs {
+			mapkey = int(event.Char) + int(C.AltZ)
+			if act, prs := t.keymap[mapkey]; prs {
 				action = act
 			}
 		}
 		switch action {
 		case actIgnore:
+		case actExecute:
+			if t.cy >= 0 && t.cy < t.merger.Length() {
+				item := t.merger.Get(t.cy)
+				executeCommand(t.execmap[mapkey], item.AsString())
+			}
 		case actInvalid:
 			t.mutex.Unlock()
 			continue

test/test_go.rb

@@ -594,6 +594,27 @@ class TestGoFZF < TestBase
     File.unlink history_file
   end
 
+  def test_execute
+    output = '/tmp/fzf-test-execute'
+    opts = %[--bind \\"alt-a:execute(echo '[{}]' >> #{output}),alt-b:execute[echo '({}), ({})' >> #{output}],C:execute:echo '({}), [{}], @{}@' >> #{output}:\\"]
+    tmux.send_keys "seq 100 | #{fzf opts}", :Enter
+    tmux.until { |lines| lines[-2].include? '100/100' }
+    tmux.send_keys :Escape, :a, :Escape, :a
+    tmux.send_keys :Up
+    tmux.send_keys :Escape, :b, :Escape, :b
+    tmux.send_keys :Up
+    tmux.send_keys :C
+    tmux.send_keys 'foobar'
+    tmux.until { |lines| lines[-2].include? '0/100' }
+    tmux.send_keys :Escape, :a, :Escape, :b, :Escape, :c
+    tmux.send_keys :Enter
+    readonce
+    assert_equal ['["1"]', '["1"]', '("2"), ("2")', '("2"), ("2")', '("3"), ["3"], @"3"@'],
+      File.readlines(output).map(&:chomp)
+  ensure
+    File.unlink output rescue nil
+  end
+
 private
   def writelines path, lines
     File.unlink path while File.exists? path