checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">

<module name="Checker">
    <!-- Each file should have this header -->
    <module name="Header">
        <property name="header" value="/**\n * Pokemon Go Bot  Copyright (C) 2016  PokemonGoBot-authors (see authors.md for more information)\n * This program comes with ABSOLUTELY NO WARRANTY;\n * This is free software, and you are welcome to redistribute it under certain conditions.\n *\n * For more information, refer to the LICENSE file in this repositories root directory\n */"/>
    </module>

    <!-- Each file should end with a newline to avoid messy diff's when appending code to end of file -->
    <module name="NewlineAtEndOfFile">
        <property name="lineSeparator" value="lf" />
    </module>

    <!-- Checks to see if a file contains a tab character. -->
    <module name="FileTabCharacter"/>

    <!-- Checks for long source files. -->
    <module name="FileLength"/>

    <!-- Trailing spaces -->
    <module name="RegexpSingleline">
        <property name="format" value="\s+$"/>
        <property name="message" value="Line has trailing spaces."/>
    </module>

    <!-- Space after 'for', 'if', 'while' -->
    <module name="RegexpSingleline">
        <property name="format" value="^\s*(for|if|while)[^ ]"/>
        <property name="message" value="Space needed before opening parenthesis."/>
    </module>

    <!-- Space between ')' and '{' -->
    <module name="RegexpSingleline">
        <property name="format" value="\)\{"/>
        <property name="message" value="Space needed between condition and block opening"/>
    </module>

    <!-- For each spacing -->
    <module name="RegexpSingleline">
        <property name="format" value="^\s*for \(.*?([^ ]:|:[^ ])"/>
        <property name="message" value="Space needed around ':' character."/>
    </module>

    <!-- TreeWalker realy doesn't like Kotlin syntax, don't even bother trying to get this working -->
    <!--module name="TreeWalker">
        <property name="fileExtensions" value="java,kt"/>
        <property name="tabWidth" value="4"/>
    </module-->
</module>