Add cursorparentfmt option to change look of cursors in parent dirs

The option defaults to the same value as `cursorfmt`, so the default look of `lf` is unchanged. However, I find it useful to make it different, since I seem to have so much trouble figuring out which of my cursors is the active one. :)

For example, here's what it looks like if one has `set cursorparentfmt "\033[7;90m"` in their `lfrc`:

https://user-images.githubusercontent.com/4123047/218299130-09ac411f-307a-489e-a4f0-4691710f8549.png

complete.go

@@ -114,6 +114,7 @@ var (
 		"noautoquit",
 		"autoquit!",
 		"cursorfmt",
+		"cursorparentfmt",
 		"cursorpreviewfmt",
 		"dircache",
 		"nodircache",

doc.go

@@ -115,6 +115,7 @@ The following options can be used to customize the behavior of lf:
 	autoquit         bool      (default off)
 	cleaner          string    (default '')
 	cursorfmt        string    (default "\033[7m")
+	cursorparentfmt  string    (default "\033[7m")
 	cursorpreviewfmt string    (default "\033[4m")
 	dircache         bool      (default on)
 	dircounts        bool      (default off)
@@ -609,14 +610,17 @@ Five arguments are passed to the file, (1) current file name, (2) width, (3) hei
 Preview clearing is disabled when the value of this option is left empty.
 
 	cursorfmt         string    (default "\033[7m")
+	cursorparentfmt   string    (default "\033[7m")
 	cursorpreviewfmt  string    (default "\033[4m")
 
 Format strings for highlighting the cursor.
-`cursorpreviewfmt` applies in panes that preview directories, and `cursorfmt` applies in all other panes.
+`cursorfmt` applies in the current directory pane,
+`cursorparentfmt` applies in panes that show parents of the current directory,
+and `cursorpreviewfmt` applies in panes that preview directories.
 
-The default is to make the normal cursor inverted and the preview cursor underlined.
+The default is to make the active cursor and the parent directory cursor inverted. The preview cursor is underlined.
 
-Some other possibilities to consider for the preview cursor: an empty string for no cursor, "\033[7;2m" for dimmed inverted text (visibility varies by terminal), "\033[7;90m" for inverted text with grey (aka "brightblack") background.
+Some other possibilities to consider for the preview or parent cursors: an empty string for no cursor, "\033[7;2m" for dimmed inverted text (visibility varies by terminal), "\033[7;90m" for inverted text with grey (aka "brightblack") background.
 
 If the format string contains the characters `%s`, it is interpreted as a format string for `fmt.Sprintf`. Such a string should end with the terminal reset sequence.
 For example, "\033[4m%s\033[0m" has the same effect as "\033[4m".

eval.go

@@ -28,6 +28,8 @@ func (e *setExpr) eval(app *app, args []string) {
 		gOpts.autoquit = false
 	case "cursorfmt":
 		gOpts.cursorfmt = e.val
+	case "cursorparentfmt":
+		gOpts.cursorparentfmt = e.val
 	case "cursorpreviewfmt":
 		gOpts.cursorpreviewfmt = e.val
 	case "autoquit!":

lf.1

@@ -134,6 +134,7 @@ The following options can be used to customize the behavior of lf:
     autoquit         bool      (default off)
     cleaner          string    (default '')
     cursorfmt        string    (default "\e033[7m")
+    cursorparentfmt  string    (default "\e033[7m")
     cursorpreviewfmt string    (default "\e033[4m")
     dircache         bool      (default on)
     dircounts        bool      (default off)
@@ -751,14 +752,15 @@ Set the path of a cleaner file. The file should be executable. This file is call
 .PP
 .EX
     cursorfmt         string    (default "\e033[7m")
+    cursorparentfmt   string    (default "\e033[7m")
     cursorpreviewfmt  string    (default "\e033[4m")
 .EE
 .PP
-Format strings for highlighting the cursor. `cursorpreviewfmt` applies in panes that preview directories, and `cursorfmt` applies in all other panes.
+Format strings for highlighting the cursor. `cursorfmt` applies in the current directory pane, `cursorparentfmt` applies in panes that show parents of the current directory, and `cursorpreviewfmt` applies in panes that preview directories.
 .PP
-The default is to make the normal cursor inverted and the preview cursor underlined.
+The default is to make the active cursor and the parent directory cursor inverted. The preview cursor is underlined.
 .PP
-Some other possibilities to consider for the preview cursor: an empty string for no cursor, "\e033[7;2m" for dimmed inverted text (visibility varies by terminal), "\e033[7;90m" for inverted text with grey (aka "brightblack") background.
+Some other possibilities to consider for the preview or parent cursors: an empty string for no cursor, "\e033[7;2m" for dimmed inverted text (visibility varies by terminal), "\e033[7;90m" for inverted text with grey (aka "brightblack") background.
 .PP
 If the format string contains the characters `%s`, it is interpreted as a format string for `fmt.Sprintf`. Such a string should end with the terminal reset sequence. For example, "\e033[4m%s\e033[0m" has the same effect as "\e033[4m".
 .PP

opts.go

@@ -31,6 +31,7 @@ var gOpts struct {
 	anchorfind       bool
 	autoquit         bool
 	cursorfmt        string
+	cursorparentfmt  string
 	cursorpreviewfmt string
 	dircache         bool
 	dircounts        bool
@@ -92,6 +93,7 @@ func init() {
 	gOpts.dirpreviews = false
 	gOpts.drawbox = false
 	gOpts.cursorfmt = "\033[7m"
+	gOpts.cursorparentfmt = "\033[7m"
 	gOpts.cursorpreviewfmt = "\033[4m"
 	gOpts.globsearch = false
 	gOpts.icons = false

ui.go

@@ -330,10 +330,18 @@ type dirContext struct {
 	tags       map[string]string
 }
 
+type dirRole int
+
+const (
+	Active dirRole = iota
+	Parent
+	Preview
+)
+
 type dirStyle struct {
-	colors     styleMap
-	icons      iconMap
-	previewing bool
+	colors styleMap
+	icons  iconMap
+	role   dirRole
 }
 
 // These colors are not currently customizeable
@@ -353,12 +361,12 @@ func (win *win) printDir(screen tcell.Screen, dir *dir, context *dirContext, dir
 		win.print(screen, 2, 0, messageStyle, "permission denied")
 		return
 	}
-	if (dir.loading && len(dir.files) == 0) || (dirStyle.previewing && dir.loading && gOpts.dirpreviews) {
+	if (dir.loading && len(dir.files) == 0) || (dirStyle.role == Preview && dir.loading && gOpts.dirpreviews) {
 		win.print(screen, 2, 0, messageStyle, "loading...")
 		return
 	}
 
-	if dirStyle.previewing && gOpts.dirpreviews && len(gOpts.previewer) > 0 {
+	if dirStyle.role == Preview && gOpts.dirpreviews && len(gOpts.previewer) > 0 {
 		// Print previewer result instead of default directory print operation.
 		st := tcell.StyleDefault
 		for i, l := range dir.lines {
@@ -475,10 +483,13 @@ func (win *win) printDir(screen tcell.Screen, dir *dir, context *dirContext, dir
 
 		ce := ""
 		if i == dir.pos {
-			if dirStyle.previewing {
-				ce = gOpts.cursorpreviewfmt
-			} else {
+			switch dirStyle.role {
+			case Active:
 				ce = gOpts.cursorfmt
+			case Parent:
+				ce = gOpts.cursorparentfmt
+			case Preview:
+				ce = gOpts.cursorpreviewfmt
 			}
 		}
 		cursorescapefmt := optionToFmtstr(ce)
@@ -920,9 +931,15 @@ func (ui *ui) draw(nav *nav) {
 		wins--
 	}
 	for i := 0; i < wins; i++ {
+		var role dirRole
+		if i < wins-1 {
+			role = Parent
+		} else {
+			role = Active
+		}
 		if dir := ui.dirOfWin(nav, i); dir != nil {
 			ui.wins[i].printDir(ui.screen, dir, &context,
-				&dirStyle{colors: ui.styles, icons: ui.icons, previewing: false})
+				&dirStyle{colors: ui.styles, icons: ui.icons, role: role})
 		}
 	}
 
@@ -958,7 +975,7 @@ func (ui *ui) draw(nav *nav) {
 
 			if curr.IsDir() {
 				preview.printDir(ui.screen, ui.dirPrev, &context,
-					&dirStyle{colors: ui.styles, icons: ui.icons, previewing: true})
+					&dirStyle{colors: ui.styles, icons: ui.icons, role: Preview})
 			} else if curr.Mode().IsRegular() {
 				preview.printReg(ui.screen, ui.regPrev)
 			}