Add interactive terminal interface

README.md

@@ -33,6 +33,12 @@ brightness 10
 brightness +20%
 ```
 
+### Interactive
+
+```bash
+brightness -i
+```
+
 ## Support
 
 Please share issues and suggestions [here](https://gitlab.com/tslocum/brightness/issues).

go.mod

@@ -1,3 +1,9 @@
 module gitlab.com/tslocum/brightness
 
 go 1.15
+
+require (
+	github.com/gdamore/tcell/v2 v2.0.0-dev.0.20200926152101-0fb77ddaa5b4
+	gitlab.com/tslocum/cview v1.5.1-0.20201012004508-bf9ccbdf1a8c
+	golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634 // indirect
+)

go.sum

@@ -0,0 +1,26 @@
+github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdko=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/gdamore/tcell/v2 v2.0.0-dev/go.mod h1:vSVL/GV5mCSlPC6thFP5kfOFdM9MGZcalipmpTxTgQA=
+github.com/gdamore/tcell/v2 v2.0.0-dev.0.20200926152101-0fb77ddaa5b4 h1:9WLVV5c2UI2qvgROlgzLgCuK5gi7igcU5LNsPXCSFB8=
+github.com/gdamore/tcell/v2 v2.0.0-dev.0.20200926152101-0fb77ddaa5b4/go.mod h1:vSVL/GV5mCSlPC6thFP5kfOFdM9MGZcalipmpTxTgQA=
+github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
+github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
+github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/rivo/uniseg v0.1.0 h1:+2KBaVoUmb9XzDsrx/Ct0W/EYOSFf/nWTauy++DprtY=
+github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+gitlab.com/tslocum/cbind v0.1.2 h1:ptDjO7WeOl1HglprsK18L8I9JeRkmtuBoBBaYw/6/Ow=
+gitlab.com/tslocum/cbind v0.1.2/go.mod h1:HfB7qAhHSZbn1rFK8M9SvSN5NG6ScAg/3h3iE6xdeeI=
+gitlab.com/tslocum/cview v1.5.1-0.20201012004508-bf9ccbdf1a8c h1:v2JiXw0558CnB1EWMaLCgmjLENvlcQyYx/0zyzWuYsI=
+gitlab.com/tslocum/cview v1.5.1-0.20201012004508-bf9ccbdf1a8c/go.mod h1:i9NyxtwBtkiVFrwmsh3Bv3dunvipjZrKX0TTdPHbzcw=
+golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200826173525-f9321e4c35a6/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f h1:+Nyd8tzPX9R7BWHguqsrbFdRx3WQ/1ib8I44HXV5yTA=
+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634 h1:bNEHhJCnrwMKNMmOx3yAynp5vs5/gRy+XWFtZFu7NBM=
+golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

main.go

@@ -23,9 +23,10 @@ var (
 const backlightsDirectory = "/sys/class/backlight"
 
 const (
-	commandSet = 1
-	commandSub = 2
-	commandAdd = 3
+	commandSet         = 1
+	commandSub         = 2
+	commandAdd         = 3
+	commandInteractive = 4
 )
 
 func init() {
@@ -150,6 +151,12 @@ func main() {
 
 	var cmd int
 	switch command {
+	case "i", "-i":
+		err := runTUI(backlight)
+		if err != nil {
+			log.Fatal(err)
+		}
+		return
 	case "set":
 		cmd = commandSet
 	case "add", "inc", "up":

tui.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"log"
+
+	"github.com/gdamore/tcell/v2"
+	"gitlab.com/tslocum/cview"
+)
+
+func center(width, height int, p cview.Primitive) cview.Primitive {
+	subFlex := cview.NewFlex()
+	subFlex.SetDirection(cview.FlexRow)
+	subFlex.AddItem(cview.NewBox(), 0, 1, false)
+	subFlex.AddItem(p, height, 1, true)
+	subFlex.AddItem(cview.NewBox(), 0, 1, false)
+
+	flex := cview.NewFlex()
+	flex.AddItem(cview.NewBox(), 0, 1, false)
+	flex.AddItem(subFlex, width, 1, true)
+	flex.AddItem(cview.NewBox(), 0, 1, false)
+
+	return flex
+}
+
+func runTUI(backlight *backlight) error {
+	done := make(chan error)
+
+	app := cview.NewApplication()
+	app.EnableMouse(true)
+
+	sliderChanged := func(value int) {
+		err := backlight.setBrightness(value)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	form := cview.NewForm()
+	form.AddSlider("Brightness", backlight.current, backlight.max, 10, sliderChanged)
+	form.SetCancelFunc(func() {
+		done <- nil
+	})
+	form.GetFormItem(0).SetFinishedFunc(func(key tcell.Key) {
+		done <- nil
+	})
+
+	app.SetRoot(center(40, 20, form), true)
+	go func() {
+		done <- app.Run()
+	}()
+
+	err := <-done
+	app.Stop()
+	return err
+}