add 'cmd-interrupt' command to kill current shell

app.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"log"
 	"os"
+	"os/exec"
 	"strconv"
 	"strings"
 )
@@ -19,6 +20,7 @@ type app struct {
 	ui         *ui
 	nav        *nav
 	quitChan   chan bool
+	cmd        *exec.Cmd
 	cmdIn      io.WriteCloser
 	cmdHist    []cmdItem
 	cmdHistInd int
@@ -230,6 +232,7 @@ func (app *app) runShell(s string, args []string, prefix string) {
 	switch prefix {
 	case "%":
 		go func() {
+			app.cmd = cmd
 			app.ui.msg = ""
 			app.ui.cmdPrefix = ">"
 
@@ -252,6 +255,7 @@ func (app *app) runShell(s string, args []string, prefix string) {
 				log.Printf("running shell: %s", err)
 			}
 			app.nav.renew(app.ui.wins[0].h)
+			app.cmd = nil
 			app.ui.cmdPrefix = ""
 			app.ui.draw(app.nav)
 		}()

doc.go

@@ -69,6 +69,7 @@ keybindings:
     cmd-delete-word   (default '<c-w>')
     cmd-put           (default '<c-y>')
     cmd-transpose     (default '<c-t>')
+    cmd-interrupt     (default '<c-c>')
 
 The following options can be used to customize the behavior of lf:
 

docstring.go

@@ -73,6 +73,7 @@ keybindings:
     cmd-delete-word   (default '<c-w>')
     cmd-put           (default '<c-y>')
     cmd-transpose     (default '<c-t>')
+    cmd-interrupt     (default '<c-c>')
 
 The following options can be used to customize the behavior of lf:
 

eval.go

@@ -559,6 +559,14 @@ func (e *callExpr) eval(app *app, args []string) {
 		if len(app.ui.cmdAccLeft) > 1 {
 			app.ui.cmdAccLeft[len(app.ui.cmdAccLeft)-1], app.ui.cmdAccLeft[len(app.ui.cmdAccLeft)-2] = app.ui.cmdAccLeft[len(app.ui.cmdAccLeft)-2], app.ui.cmdAccLeft[len(app.ui.cmdAccLeft)-1]
 		}
+	case "cmd-interrupt":
+		if app.cmd != nil {
+			app.cmd.Process.Kill()
+		}
+		app.ui.menuBuf = nil
+		app.ui.cmdAccLeft = nil
+		app.ui.cmdAccRight = nil
+		app.ui.cmdPrefix = ""
 	default:
 		cmd, ok := gOpts.cmds[e.name]
 		if !ok {

opts.go

@@ -124,6 +124,7 @@ func init() {
 	gOpts.cmdkeys["<c-w>"] = &callExpr{"cmd-delete-word", nil}
 	gOpts.cmdkeys["<c-y>"] = &callExpr{"cmd-put", nil}
 	gOpts.cmdkeys["<c-t>"] = &callExpr{"cmd-transpose", nil}
+	gOpts.cmdkeys["<c-c>"] = &callExpr{"cmd-interrupt", nil}
 
 	gOpts.cmds = make(map[string]expr)