Add command for registering data paths of installed games

main.go

@@ -27,9 +27,7 @@ var commands = []Command{
 		IsVarargs:   true,
 
 		Action: func(requiredArguments []string, providedArguments []string) (string, error) {
-			var argumentCount = len(providedArguments)
+			if len(providedArguments) < len(requiredArguments) {
-
-			if argumentCount < len(requiredArguments) {
 				return "", fmt.Errorf("expected %s folowed by at least one %ss",
 					requiredArguments[0], requiredArguments[1])
 			}
@@ -56,6 +54,29 @@ var commands = []Command{
 		},
 	},
 
+	{
+		Name:        "register",
+		Description: "Registers the data directory path of game for management under the given name",
+		Arguments:   []string{"data path", "game name"},
+		IsVarargs:   false,
+
+		Action: func(requiredArguments []string, providedArguments []string) (string, error) {
+			if len(providedArguments) < len(requiredArguments) {
+				return "", fmt.Errorf("expected %s folowed by at least one %ss",
+					requiredArguments[0], requiredArguments[1])
+			}
+
+			var dataPath = providedArguments[0]
+			var gameName = providedArguments[1]
+
+			if registerGameError := RegisterGame(gameName, dataPath); registerGameError != nil {
+				return "", registerGameError
+			}
+
+			return fmt.Sprintf("Registered %s at %s", gameName, dataPath), nil
+		},
+	},
+
 	{
 		Name:        "remove",
 		Description: "Remove one or more mods from modman",
@@ -169,13 +190,13 @@ var commands = []Command{
 		Arguments:   []string{"game name", "mod name"},
 		IsVarargs:   true,
 
-		Action: func(requiredArguments []string, arguments []string) (string, error) {
+		Action: func(requiredArguments []string, providedArguments []string) (string, error) {
-			if len(arguments) != len(requiredArguments) {
+			if len(providedArguments) != len(requiredArguments) {
 				return "", fmt.Errorf("expected %s followed by one or more %ss",
 					requiredArguments[0], requiredArguments[1])
 			}
 
-			var game, gameOpenError = OpenGame(arguments[0])
+			var game, gameOpenError = OpenGame(providedArguments[0])
 
 			if gameOpenError != nil {
 				return "", gameOpenError
@@ -191,7 +212,7 @@ var commands = []Command{
 				return "", cleanError
 			}
 
-			for _, modName := range arguments[1:] {
+			for _, modName := range providedArguments[1:] {
 				if deployError := game.DeployMod(modName); deployError != nil {
 					return "", deployError
 				}

manager.go

@@ -461,6 +461,60 @@ func (game *Game) RemoveMods(names []string) error {
 	return nil
 }
 
+func RegisterGame(name string, dataPath string) error {
+	var configPath, configPathError = os.UserConfigDir()
+
+	if configPathError != nil {
+		return configPathError
+	}
+
+	var gamesPath = filepath.Join(configPath, "modman", "games.ini")
+
+	var gamesEntries = []ini.Entry{{
+		Section: name,
+		Key:     "path",
+		Value:   dataPath,
+	}}
+
+	if gamesFile, gamesFileError := os.Open(gamesPath); gamesFileError == nil {
+		var gamesParser = ini.NewParser(gamesFile)
+
+		for entry := gamesParser.Parse(); !(gamesParser.IsEnd()); entry = gamesParser.Parse() {
+			gamesEntries = append(gamesEntries, entry)
+		}
+
+		if err := gamesFile.Close(); err != nil {
+			return err
+		}
+
+		if err := gamesParser.Err(); err != nil {
+			return err
+		}
+	} else if !(os.IsNotExist(gamesFileError)) {
+		return gamesFileError
+	}
+
+	if gamesFile, gamesFileError := os.Create(gamesPath); gamesFileError == nil {
+		var writeError = ini.Write(gamesFile, gamesEntries)
+
+		if err := gamesFile.Sync(); err != nil {
+			return err
+		}
+
+		if err := gamesFile.Close(); err != nil {
+			return err
+		}
+
+		if writeError != nil {
+			return writeError
+		}
+	} else {
+		return gamesFileError
+	}
+
+	return nil
+}
+
 func (game *Game) RenameMod(modName string, newName string) error {
 	if _, exists := game.Mods[modName]; !(exists) {
 		return fmt.Errorf("no mod with that name exists")