Refactor away os.Exit

Try to minimise the useage of os.Exit

Apart from init, os.Exit is only used once as the final function call.
Now we can ensure there are no random exits hidding in the code. We can
also allow part of the code to error and continue on while also
remembering that we did error and return non 0 when we finally do reach
the os.Exit. This comes in very handy for trying to save the vcs info
after an error and ensuring that alpmHandle.Release is always called.

cmd.go

@@ -142,6 +142,18 @@ func init() {
 }
 
 func main() {
+	status := run()
+	
+	err := alpmHandle.Release()
+	if err != nil {
+		fmt.Println(err)
+		status = 1
+	}
+	
+	os.Exit(status)
+}
+
+func run() (status int) {
 	var err error
 	var changedConfig bool
 	
@@ -150,7 +162,8 @@ func main() {
 	
 	if err != nil {
 		fmt.Println(err)
-		os.Exit(1)
+		status = 1
+		return
 	}
 	
 	if parser.existsArg("-") {
@@ -158,16 +171,17 @@ func main() {
 
 		if err != nil {
 			fmt.Println(err)
-			os.Exit(1)
+			status = 1
+			return
 		}
 	}
 	
-	fmt.Println(parser)
-	
 	changedConfig, err = handleCmd(parser)
 	
 	if err != nil {
 		fmt.Println(err)
+		status = 1
+		//try continue onward
 	}
 	
 	if updated {
@@ -175,6 +189,7 @@ func main() {
 		
 		if err != nil {
 			fmt.Println(err)
+			status = 1
 		}
 	}
 
@@ -183,16 +198,16 @@ func main() {
 		
 		if err != nil {
 			fmt.Println(err)
+			status = 1
 		}
 
 	}
-
-	err = alpmHandle.Release()
-	if err != nil {
-		fmt.Println(err)
-	}
+	
+	return
+	
 }
 
+
 func handleCmd(parser *argParser) (changedConfig bool, err error) {
 	var _changedConfig bool