Swiftlint: Adding custom rules

[dddppp]

I am trying to add a custom rule that I found here to my SwiftLint.yml file.

However when I compile the project I get a fatal_error (see details below)

This is what I add to the bottom of the SwiftLint file:

custom_rules:
    void_as_return:
    name: "Void as Parameter"
    message: "Use Void as return type instead of ()."
    regex: "(->[ ]?\(\))"

    smiley_face:
    name: "Smiley Face"
    regex: "(\:\))"
    match_kinds:
    - comment
    - string
    message: "A closing parenthesis smiley :) creates a half-hearted smile, and thus is not preferred. Use :]"
    severity: warning

I get the following error:

fatal error: Could not read configuration file at path '/Users/-/Documents/Workspace_Xcode/ProjectName/.swiftlint.yml': Error parsing YAML: duplicate key String(name), near ": \"Smiley Face\"\nregex: \"(\:))\"\nmatch_kinds:\n- com": file /Users/jp/Projects/SwiftLint/Source/SwiftLintFramework/Models/Configuration.swift, line 162

What am I missing?

It says that there is a duplicate string, hence I assume that there is already a smiley_face rule in the YAML file. However, when I run swiftlint rulesfrom terminal I don't see it enabled.

Here is what I've got:

[drodriguez]

@dddppp: you are missing one indentation level in your yml file.

custom_rules:
    void_as_return:
        name: "Void as Parameter"
        message: "Use Void as return type instead of ()."
        regex: "(->[ ]?\(\))"

    smiley_face:
        name: "Smiley Face"
        regex: "(\:\))"
        match_kinds:
            - comment
            - string
        message: "A closing parenthesis smiley :) creates a half-hearted smile, and thus is not preferred. Use :]"
        severity: warning

[jpsim]

SwiftLint requires configuration files to be valid YAML.

YAMLlint produces the following error with your original content:

(<unknown>): found unknown escape character while parsing a quoted scalar at line 5 column 12

Also @drodriguez's recommendation isn't sufficient, as the escape character remains.

You probably want this configuration:

custom_rules:
    void_as_return:
        name: "Void as Parameter"
        message: "Use Void as return type instead of ()."
        regex: '(->[ ]?\(\))'

    smiley_face:
        name: "Smiley Face"
        regex: '(\:\))'
        match_kinds:
            - comment
            - string
        message: "A closing parenthesis smiley :) creates a half-hearted smile, and thus is not preferred. Use :]"
        severity: warning

By using single quotes (') rather than double quotes ("), the \ character isn't treated like a YAML escape command but rather as a plain string.