log plugin errors

main.go

@@ -156,16 +156,18 @@ func main() {
 		log.Fatal("interval must be greater or equal to zero")
 	}
 	var plugin Plugin
+	var pluginName string
 	platformErrors := ""
-	for _, f := range Plugins {
+	for _, pluginInfo := range Plugins {
+		pluginName = pluginInfo.Name
 		var err error
-		plugin, err = f()
+		plugin, err = pluginInfo.Init()
 		if err == nil {
 			break
 		} else if _, ok := err.(UnsupportedPlatformError); ok {
-			platformErrors += err.Error() + "\n"
+			platformErrors += fmt.Sprintf("%s plugin: %v\n", pluginName, err)
 		} else {
-			log.Fatal(err)
+			log.Fatal(fmt.Sprintf("%s plugin: %v", pluginName, err))
 		}
 	}
 	if plugin == nil {
@@ -212,6 +214,7 @@ func main() {
 				return
 			}
 			if err := processCommand(plugin, message); err != nil {
+				log.Print(fmt.Sprintf("%s plugin: %v", pluginName, err))
 				return
 			}
 		}

plugin.go

@@ -19,20 +19,22 @@
 
 package main
 
-import "fmt"
+type PluginInfo struct {
+	Name string
+	Init func() (Plugin, error)
+}
 
-var Plugins [](func() (Plugin, error)) = [](func() (Plugin, error)){
+var Plugins []PluginInfo = []PluginInfo{
-	InitX11Plugin,
+	{"X11", InitX11Plugin},
-	InitWindowsPlugin,
+	{"Windows", InitWindowsPlugin},
 }
 
 type UnsupportedPlatformError struct {
-	name    string
+	err error
-	message string
 }
 
 func (e UnsupportedPlatformError) Error() string {
-	return fmt.Sprintf("%s plugin: %s", e.name, e.message)
+	return e.err.Error()
 }
 
 type Plugin interface {

plugin_windows.go

@@ -75,7 +75,7 @@ func InitWindowsPlugin() (Plugin, error) {
 	p.userDLL = syscall.NewLazyDLL("user32.dll")
 	p.sendInputProc = p.userDLL.NewProc("SendInput")
 	if err := p.sendInputProc.Find(); err != nil {
-		return nil, UnsupportedPlatformError{"Windows", err.Error()}
+		return nil, UnsupportedPlatformError{err}
 	}
 	return p, nil
 }

plugin_windows_dummy.go

@@ -21,6 +21,8 @@
 
 package main
 
+import "errors"
+
 func InitWindowsPlugin() (Plugin, error) {
-	return nil, UnsupportedPlatformError{"Windows", "disabled"}
+	return nil, UnsupportedPlatformError{errors.New("disabled")}
 }

plugin_x11.go

@@ -43,7 +43,8 @@ type x11Plugin struct {
 func InitX11Plugin() (Plugin, error) {
 	display := C.XOpenDisplay(nil)
 	if display == nil {
-		return nil, UnsupportedPlatformError{"X11", "failed to connect to X server"}
+		return nil, UnsupportedPlatformError{
+			errors.New("failed to connect to X server")}
 	}
 	return &x11Plugin{display: display}, nil
 }

plugin_x11_dummy.go

@@ -21,6 +21,8 @@
 
 package main
 
+import "errors"
+
 func InitX11Plugin() (Plugin, error) {
-	return nil, UnsupportedPlatformError{"X11", "disabled"}
+	return nil, UnsupportedPlatformError{errors.New("disabled")}
 }