Merge branch 'feature/callback' into develop

README.md

@@ -37,7 +37,7 @@ workspaces:
   "Name of the workspace 3": /home/alice/wallpapers/3.jpg
 ```
 
-Next, you simply need to run `i3-wallpaper-manager` while specify the path to the configuration file.
+Next, you simply need to run `i3-wallpaper-manager` and specify the path to the configuration file.
 
 ```bash
 DISPLAY=:0 i3-wallpaper-manager /path/to/config.yaml
@@ -48,3 +48,17 @@ To run it when i3 starts, add this to your i3 configuration:
 ```bash
 exec_always DISPLAY=:0 i3-wallpaper-manager /path/to/config.yaml
 ```
+
+If you wish to use a program other than `feh`, set the `callback` parameter by specifying the path to your script.
+
+```
+#!/bin/sh
+
+SCREEN_1="$1"
+WALLPAPER_1="$2"
+
+SCREEN_2="$3"
+WALLPAPER_2="$4"
+
+# ...
+```

callback.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"os"
+	"os/exec"
+)
+
+func CallbackUpdateWallpapers(callback string, files, screens []string) (*exec.Cmd, error) {
+	args := []string{}
+
+	for key, file := range files {
+		args = append(args, screens[key], file)
+	}
+
+	cmd := exec.Command(callback, args...)
+	cmd.Env = os.Environ()
+
+	return cmd, cmd.Run()
+}

config.go

@@ -8,6 +8,7 @@ import (
 
 type Config struct {
 	Default    string            `yaml:"default"`
+	Callback   string            `yaml:"callback"`
 	Workspaces map[string]string `yaml:"workspaces"`
 }
 

config.yaml.example

@@ -3,3 +3,4 @@ workspaces:
   "Name of the workspace 1": /home/alice/wallpapers/1.jpg
   "Name of the workspace 2": /home/alice/wallpapers/2.jpg
   "Name of the workspace 3": /home/alice/wallpapers/3.jpg
+# callback: /path/to/custom.sh

wallpaper.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"log"
+	"os/exec"
 
 	"go.i3wm.org/i3"
 )
@@ -17,11 +18,12 @@ func GetWorkspaceWallpaper(workspace string, config Config) string {
 	return file
 }
 
-func GetOutputsWallpapers(config Config) ([]string, error) {
+func GetOutputsWallpapers(config Config) ([]string, []string, error) {
 	files := []string{}
+	screens := []string{}
 	outputs, err := i3.GetOutputs()
 	if err != nil {
-		return files, err
+		return files, screens, err
 	}
 
 	for _, output := range outputs {
@@ -30,21 +32,28 @@ func GetOutputsWallpapers(config Config) ([]string, error) {
 
 			if file != "" {
 				files = append(files, file)
+				screens = append(screens, output.Name)
 			}
 		}
 	}
 
-	return files, nil
+	return files, screens, nil
 }
 
 func UpdateWallapers(config Config) {
-	files, err := GetOutputsWallpapers(config)
+	files, screens, err := GetOutputsWallpapers(config)
 	if err != nil {
 		log.Printf("[ERROR] %s", err.Error())
 		return
 	}
 
-	cmd, err := FehUpdateWallpapers(files)
+	var cmd *exec.Cmd
+
+	if config.Callback == "" {
+		cmd, err = FehUpdateWallpapers(files)
+	} else {
+		cmd, err = CallbackUpdateWallpapers(config.Callback, files, screens)
+	}
 
 	if err != nil {
 		log.Printf("[ERROR] cmd=%s error=%s", cmd.String(), err.Error())