add 'color256' option to control color mode

Related #104

client.go

@@ -29,7 +29,7 @@ func run() {
 	}
 	defer termbox.Close()
 
-	termbox.SetOutputMode(termbox.Output256)
+	setColorMode()
 
 	app := newApp()
 

complete.go

@@ -64,6 +64,9 @@ var (
 		"anchorfind",
 		"noanchorfind",
 		"anchorfind!",
+		"color256",
+		"nocolor256",
+		"color256!",
 		"dircounts",
 		"nodircounts",
 		"dircounts!",

doc.go

@@ -95,6 +95,7 @@ keybindings:
 The following options can be used to customize the behavior of lf:
 
     anchorfind  boolean   (default on)
+    color256    boolean   (default off)
     dircounts   boolean   (default off)
     dirfirst    boolean   (default on)
     drawbox     boolean   (default off)
@@ -638,6 +639,13 @@ If both of these environment variables are not set, then lf fallbacks to its
 default colorscheme. Default lf colors are taken from GNU dircolors defaults.
 These defaults use 8 basic colors and bold attribute.
 
+You should also note that lf uses 8 color mode by default which uses sgr 3-bit
+color escapes (e.g. '\033[34m'). If you want to use 256 colors, you need to
+enable 'color256' option which then makes lf use sgr 8-bit color escapes (e.g.
+'\033[38;5;4m'). This option is intended to eliminate differences between
+default colors used by ls and lf since terminals may render 3-bit and 8-bit
+escapes differently even for the same color.
+
 Keeping this mechanism in mind, you can configure lf colors in two different
 ways. First, you can configure 8 basic colors used by your terminal and lf
 should pick up those colors automatically. Depending on your terminal, you
@@ -650,5 +658,10 @@ fine grained customization. This is useful to change colors used for different
 file types and extensions. '$LS_COLORS' is more powerful than '$LSCOLORS' and
 it can be used even when GNU programs are not installed on the system. You can
 combine this second method with the first method for best results.
+
+Lastly, you may also want to configure the colors of the prompt line to match
+the rest of the colors. Colors of the prompt line can be configured using the
+'promptfmt' option which can include hardcoded colors as ansi escapes. See the
+default value of this option to have an idea about how to color this line.
 */
 package main

docstring.go

@@ -98,6 +98,7 @@ keybindings:
 The following options can be used to customize the behavior of lf:
 
     anchorfind  boolean   (default on)
+    color256    boolean   (default off)
     dircounts   boolean   (default off)
     dirfirst    boolean   (default on)
     drawbox     boolean   (default off)
@@ -668,6 +669,13 @@ If both of these environment variables are not set, then lf fallbacks to its
 default colorscheme. Default lf colors are taken from GNU dircolors
 defaults. These defaults use 8 basic colors and bold attribute.
 
+You should also note that lf uses 8 color mode by default which uses sgr
+3-bit color escapes (e.g. '\033[34m'). If you want to use 256 colors, you
+need to enable 'color256' option which then makes lf use sgr 8-bit color
+escapes (e.g. '\033[38;5;4m'). This option is intended to eliminate
+differences between default colors used by ls and lf since terminals may
+render 3-bit and 8-bit escapes differently even for the same color.
+
 Keeping this mechanism in mind, you can configure lf colors in two different
 ways. First, you can configure 8 basic colors used by your terminal and lf
 should pick up those colors automatically. Depending on your terminal, you
@@ -681,4 +689,10 @@ different file types and extensions. '$LS_COLORS' is more powerful than
 '$LSCOLORS' and it can be used even when GNU programs are not installed on
 the system. You can combine this second method with the first method for
 best results.
+
+Lastly, you may also want to configure the colors of the prompt line to
+match the rest of the colors. Colors of the prompt line can be configured
+using the 'promptfmt' option which can include hardcoded colors as ansi
+escapes. See the default value of this option to have an idea about how to
+color this line.
 `

eval.go

@@ -20,6 +20,21 @@ func (e *setExpr) eval(app *app, args []string) {
 		gOpts.anchorfind = false
 	case "anchorfind!":
 		gOpts.anchorfind = !gOpts.anchorfind
+	case "color256":
+		gOpts.color256 = true
+		setColorMode()
+		app.ui.pause()
+		app.ui.resume()
+	case "nocolor256":
+		gOpts.color256 = false
+		setColorMode()
+		app.ui.pause()
+		app.ui.resume()
+	case "color256!":
+		gOpts.color256 = !gOpts.color256
+		setColorMode()
+		app.ui.pause()
+		app.ui.resume()
 	case "dircounts":
 		gOpts.dircounts = true
 	case "nodircounts":

lf.1

@@ -110,6 +110,7 @@ The following options can be used to customize the behavior of lf:
 .PP
 .EX
     anchorfind  boolean   (default on)
+    color256    boolean   (default off)
     dircounts   boolean   (default off)
     dirfirst    boolean   (default on)
     drawbox     boolean   (default off)
@@ -613,6 +614,10 @@ If '$LS_COLORS' variable is not set, '$LSCOLORS' variable is checked instead. Th
 .PP
 If both of these environment variables are not set, then lf fallbacks to its default colorscheme. Default lf colors are taken from GNU dircolors defaults. These defaults use 8 basic colors and bold attribute.
 .PP
+You should also note that lf uses 8 color mode by default which uses sgr 3-bit color escapes (e.g. '\e033[34m'). If you want to use 256 colors, you need to enable 'color256' option which then makes lf use sgr 8-bit color escapes (e.g. '\e033[38;5;4m'). This option is intended to eliminate differences between default colors used by ls and lf since terminals may render 3-bit and 8-bit escapes differently even for the same color.
+.PP
 Keeping this mechanism in mind, you can configure lf colors in two different ways. First, you can configure 8 basic colors used by your terminal and lf should pick up those colors automatically. Depending on your terminal, you should be able to select your colors from a 24-bit palette. This is the recommended approach as colors used by other programs will also match each other.
 .PP
 Second, you can set the values of environmental variables mentioned above for fine grained customization. This is useful to change colors used for different file types and extensions. '$LS_COLORS' is more powerful than '$LSCOLORS' and it can be used even when GNU programs are not installed on the system. You can combine this second method with the first method for best results.
+.PP
+Lastly, you may also want to configure the colors of the prompt line to match the rest of the colors. Colors of the prompt line can be configured using the 'promptfmt' option which can include hardcoded colors as ansi escapes. See the default value of this option to have an idea about how to color this line.

opts.go

@@ -26,6 +26,7 @@ type sortType struct {
 
 var gOpts struct {
 	anchorfind bool
+	color256   bool
 	dircounts  bool
 	drawbox    bool
 	globsearch bool
@@ -57,6 +58,7 @@ var gOpts struct {
 
 func init() {
 	gOpts.anchorfind = true
+	gOpts.color256 = false
 	gOpts.dircounts = false
 	gOpts.drawbox = false
 	gOpts.globsearch = false

ui.go

@@ -892,6 +892,14 @@ func (ui *ui) readExpr() <-chan expr {
 	return ch
 }
 
+func setColorMode() {
+	if gOpts.color256 {
+		termbox.SetOutputMode(termbox.Output256)
+	} else {
+		termbox.SetOutputMode(termbox.OutputNormal)
+	}
+}
+
 func (ui *ui) pause() {
 	termbox.Close()
 }