Enable focus events through configuration by using focus (option), on…

…-ui-enter/on-ui-exit (events) and echoraw (command).

app.go

@@ -299,6 +299,8 @@ func (app *app) loop() {
 		}()
 	}
 
+	onUiEnter(app)
+
 	for {
 		select {
 		case <-app.quitChan:
@@ -321,6 +323,7 @@ func (app *app) loop() {
 				cmd.eval(app, nil)
 			}
 
+			onUiExit(app)
 			app.quit()
 
 			app.nav.previewChan <- ""
@@ -466,6 +469,7 @@ func (app *app) loop() {
 			app.ui.draw(app.nav)
 		}
 	}
+
 }
 
 // This function is used to run a shell command. Modes are as follows:
@@ -492,6 +496,7 @@ func (app *app) runShell(s string, args []string, prefix string) {
 		app.nav.previewChan <- ""
 		app.nav.dirPreviewChan <- nil
 
+		onUiExit(app)
 		if err := app.ui.suspend(); err != nil {
 			log.Printf("suspend: %s", err)
 		}
@@ -501,6 +506,7 @@ func (app *app) runShell(s string, args []string, prefix string) {
 				os.Exit(3)
 				return
 			}
+			onUiEnter(app)
 		}()
 		defer app.nav.renew()
 

doc.go

@@ -52,6 +52,7 @@ The following commands are provided by lf:
 	echo
 	echomsg
 	echoerr
+	echoraw
 	cd
 	select
 	delete         (modal)
@@ -123,6 +124,7 @@ The following options can be used to customize the behavior of lf:
 	errorfmt       string    (default "\033[7;31;47m%s\033[0m")
 	filesep        string    (default "\n")
 	findlen        int       (default 1)
+	focus          string    (default "on")
 	globsearch     bool      (default off)
 	hidden         bool      (default off)
 	hiddenfiles    []string  (default '.*')
@@ -188,6 +190,8 @@ The following special shell commands are used to customize the behavior of lf wh
 	pre-cd
 	on-cd
 	on-select
+	on-ui-enter
+	on-ui-exit
 	on-quit
 
 The following commands/keybindings are provided by default:
@@ -388,6 +392,10 @@ Print given arguments to the message line at the bottom and also to the log file
 
 Print given arguments to the message line at the bottom as 'errorfmt' and also to the log file.
 
+	echoraw
+
+Print string directly to the terminal. This should only be used to send escape sequences to your terminal program or tmux.
+
 	cd
 
 Change the working directory to the given argument.
@@ -625,6 +633,10 @@ File separator used in environment variables 'fs' and 'fx'.
 Number of characters prompted for the find command.
 When this value is set to 0, find command prompts until there is only a single match left.
 
+	focus          string    (default "on")
+
+This can be used to customize the focus line in combination with a focus event (see wiki). Currently accepts "on" (inverse) and "off" (hidden).
+
 	globsearch     bool      (default off)
 
 When this option is enabled, search command patterns are considered as globs, otherwise they are literals.
@@ -913,6 +925,14 @@ This shell command can be defined to be executed after changing a directory.
 
 This shell command can be defined to be executed after the selection changes.
 
+	on-ui-enter
+
+This shell command can be defined to be executed when the UI of lf becomes active. This will be triggered after lf starts and when foreground shell commands finish.
+
+	on-ui-exit
+
+This shell command can be defined to be executed when the UI of lf becomes inactive. This will be triggered before lf exits and before starting foreground shell commands.
+
 	on-quit
 
 This shell command can be defined to be executed before quit.

eval.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"io"
 	"log"
 	"os"
@@ -430,6 +431,10 @@ func (e *setExpr) eval(app *app, args []string) {
 		}
 	case "tagfmt":
 		gOpts.tagfmt = e.val
+	case "focus":
+		gOpts.focus = e.val
+		app.ui.loadFile(app, true)
+		app.ui.loadFileInfo(app.nav)
 	case "timefmt":
 		gOpts.timefmt = e.val
 	case "infotimefmtnew":
@@ -501,6 +506,18 @@ func onSelect(app *app) {
 	}
 }
 
+func onUiEnter(app *app) {
+	if cmd, ok := gOpts.cmds["on-ui-enter"]; ok {
+		cmd.eval(app, nil)
+	}
+}
+
+func onUiExit(app *app) {
+	if cmd, ok := gOpts.cmds["on-ui-exit"]; ok {
+		cmd.eval(app, nil)
+	}
+}
+
 func splitKeys(s string) (keys []string) {
 	for i := 0; i < len(s); {
 		r, w := utf8.DecodeRuneInString(s[i:])
@@ -1540,6 +1557,8 @@ func (e *callExpr) eval(app *app, args []string) {
 		app.ui.echomsg(strings.Join(e.args, " "))
 	case "echoerr":
 		app.ui.echoerr(strings.Join(e.args, " "))
+	case "echoraw":
+		fmt.Print(strings.Join(e.args, " "))
 	case "cd":
 		path := "~"
 		if len(e.args) > 0 {

lf.1

@@ -67,6 +67,7 @@ The following commands are provided by lf:
     echo
     echomsg
     echoerr
+    echoraw
     cd
     select
     delete         (modal)
@@ -142,6 +143,7 @@ The following options can be used to customize the behavior of lf:
     errorfmt       string    (default "\e033[7;31;47m%s\e033[0m")
     filesep        string    (default "\en")
     findlen        int       (default 1)
+    focus          string    (default "on")
     globsearch     bool      (default off)
     hidden         bool      (default off)
     hiddenfiles    []string  (default '.*')
@@ -211,6 +213,8 @@ The following special shell commands are used to customize the behavior of lf wh
     pre-cd
     on-cd
     on-select
+    on-ui-enter
+    on-ui-exit
     on-quit
 .EE
 .PP
@@ -464,6 +468,12 @@ Print given arguments to the message line at the bottom and also to the log file
 .PP
 Print given arguments to the message line at the bottom as 'errorfmt' and also to the log file.
 .PP
+.EX
+    echoraw
+.EE
+.PP
+Print string directly to the terminal. This should only be used to send escape sequences to your terminal program or tmux.
+.PP
 .EX
     cd
 .EE
@@ -773,6 +783,12 @@ File separator used in environment variables 'fs' and 'fx'.
 .PP
 Number of characters prompted for the find command. When this value is set to 0, find command prompts until there is only a single match left.
 .PP
+.EX
+    focus          string    (default "on")
+.EE
+.PP
+This can be used to customize the focus line in combination with a focus event (see wiki). Currently accepts "on" (inverse) and "off" (hidden).
+.PP
 .EX
     globsearch     bool      (default off)
 .EE
@@ -1125,6 +1141,18 @@ This shell command can be defined to be executed after changing a directory.
 .PP
 This shell command can be defined to be executed after the selection changes.
 .PP
+.EX
+    on-ui-enter
+.EE
+.PP
+This shell command can be defined to be executed when the UI of lf becomes active. This will be triggered after lf starts and when foreground shell commands finish.
+.PP
+.EX
+    on-ui-exit
+.EE
+.PP
+This shell command can be defined to be executed when the UI of lf becomes inactive. This will be triggered before lf exits and before starting foreground shell commands.
+.PP
 .EX
     on-quit
 .EE

opts.go

@@ -79,6 +79,7 @@ var gOpts struct {
 	sortType       sortType
 	tempmarks      string
 	tagfmt         string
+	focus          string
 }
 
 func init() {
@@ -129,6 +130,7 @@ func init() {
 	gOpts.sortType = sortType{naturalSort, dirfirstSort}
 	gOpts.tempmarks = "'"
 	gOpts.tagfmt = "\033[31m%s\033[0m"
+	gOpts.focus = "on"
 
 	gOpts.keys = make(map[string]expr)
 

ui.go

@@ -416,7 +416,7 @@ func (win *win) printDir(screen tcell.Screen, dir *dir, selections map[string]in
 			}
 		}
 
-		if i == dir.pos {
+		if i == dir.pos && gOpts.focus == "on" {
 			st = st.Reverse(true)
 		}
 
@@ -467,7 +467,7 @@ func (win *win) printDir(screen tcell.Screen, dir *dir, selections map[string]in
 
 		tag, ok := tags[path]
 		if ok {
-			if i == dir.pos {
+			if i == dir.pos && gOpts.focus == "on" {
 				win.print(screen, lnwidth+1, i, st.Reverse(true), tag)
 			} else {
 				win.print(screen, lnwidth+1, i, tcell.StyleDefault, fmt.Sprintf(gOpts.tagfmt, tag))
@@ -1164,17 +1164,32 @@ func (ui *ui) readNormalEvent(ev tcell.Event) expr {
 	return nil
 }
 
-func readCmdEvent(ev tcell.Event) expr {
+func (ui *ui) readCmdEvent(ev tcell.Event) expr {
 	switch tev := ev.(type) {
 	case *tcell.EventKey:
 		if tev.Key() == tcell.KeyRune {
 			if tev.Modifiers() == tcell.ModMask(tcell.ModAlt) {
-				val := string([]rune{'<', 'a', '-', tev.Rune(), '>'})
-				if expr, ok := gOpts.cmdkeys[val]; ok {
-					return expr
+				// support multi-key bindings but only for ESC[ at the moment
+				if tev.Rune() == '[' {
+					ui.keyAcc = append(ui.keyAcc, '<', 'a', '-', tev.Rune(), '>')
+				} else {
+					val := string([]rune{'<', 'a', '-', tev.Rune(), '>'})
+					if expr, ok := gOpts.cmdkeys[val]; ok {
+						return expr
+					}
 				}
 			} else {
-				return &callExpr{"cmd-insert", []string{string(tev.Rune())}, 1}
+				// multi-key bindings
+				if ui.keyAcc != nil {
+					ui.keyAcc = append(ui.keyAcc, tev.Rune())
+					val := string(ui.keyAcc)
+					ui.keyAcc = nil
+					if expr, ok := gOpts.cmdkeys[val]; ok {
+						return expr
+					}
+				} else {
+					return &callExpr{"cmd-insert", []string{string(tev.Rune())}, 1}
+				}
 			}
 		} else {
 			val := gKeyVal[tev.Key()]
@@ -1192,7 +1207,7 @@ func (ui *ui) readEvent(ev tcell.Event) expr {
 	}
 
 	if _, ok := ev.(*tcell.EventKey); ok && ui.cmdPrefix != "" {
-		return readCmdEvent(ev)
+		return ui.readCmdEvent(ev)
 	}
 
 	return ui.readNormalEvent(ev)