Gwt. LESS. Maven. Chain: * .less to .css (lesscss-maven-plugin) * .css to almost .css (replacer plugin) * .almost .css to gwtResources

some_css.css

@sprite
.mainBackground {
    gwt-image: "mainBackground";
    background-repeat: repeat;
}

@sprite
.logoBackground {
    gwt-image: "logoBackground";
    overflow: hidden;
    width: 100%;
    background-repeat: repeat-x;
    height: 70px;
    position: relative;
    top: 0;
    left: 0;
}

some_css.less

/*!gwt @sprite !gwt*/
.mainBackground {
    gwt-image: "mainBackground";
    background-repeat: repeat;
}

/*!gwt @sprite !gwt*/
.logoBackground {
    gwt-image: "logoBackground";
    overflow: hidden;
    width: 100%;
    background-repeat: repeat-x;
    height: 70px;
    position: relative;
    top: 0;
    left: 0;
}

some_pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>webmodules</artifactId>
        <groupId>ru.brbpm.lecm</groupId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>styles-wm</artifactId>

    <name>LECM / Web Modules / Styles WM</name>

    <build>

        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <!--<excludes>-->
                <!--<exclude>less</exclude>-->
                <!--<exclude>*.less</exclude>-->
                <!--</excludes>-->
            </resource>
            <resource>
                <directory>src/main/java</directory>
            </resource>
            <resource>
                <directory>${project.build.directory}/css</directory>
            </resource>
            <resource>
                <directory>${project.build.directory}/generated-sources/gwt</directory>
            </resource>

        </resources>

        <plugins>

            <!--<plugin>-->
            <!--<groupId>com.github.eirslett</groupId>-->
            <!--<artifactId>frontend-maven-plugin</artifactId>-->
            <!--&lt;!&ndash; NB! Set <version> to the latest released version of frontend-maven-plugin, like in README.md &ndash;&gt;-->
            <!--<version>0.0.7</version>-->

            <!--<executions>-->

            <!--<execution>-->
            <!--<id>install node and npm</id>-->
            <!--<goals>-->
            <!--<goal>install-node-and-npm</goal>-->
            <!--</goals>-->
            <!--<configuration>-->
            <!--<nodeVersion>v0.10.18</nodeVersion>-->
            <!--<npmVersion>1.3.8</npmVersion>-->
            <!--</configuration>-->
            <!--</execution>-->


            <!--</executions>-->
            <!--</plugin>-->


            <plugin>
                <groupId>org.lesscss</groupId>
                <artifactId>lesscss-maven-plugin</artifactId>
                <version>1.3.3</version>
                <configuration>
                    <sourceDirectory>${project.basedir}/src/main/resources</sourceDirectory>
                    <outputDirectory>${project.build.directory}/css</outputDirectory>
                    <excludes>
                        <exclude>**/Elements.less</exclude>
                        <exclude>**/Constants.less</exclude>
                    </excludes>
                    <compress>false</compress>

                </configuration>
                <executions>
                    <execution>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>


            <plugin>
                <groupId>com.google.code.maven-replacer-plugin</groupId>
                <artifactId>replacer</artifactId>
                <version>1.5.2</version>

                <executions>
                    <execution>
                        <id>less gwt</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>replace</goal>
                        </goals>
                        <configuration>
                            <includes>
                                <include>**/css/ru/brbpm/lecm/wm/styles/client/**/*.css</include>
                            </includes>
                            <variableTokenValueMap>/\\*!gwt\\s*=,\\s*!gwt\\*/=\u0020</variableTokenValueMap>
                        </configuration>
                    </execution>

                    <execution>
                        <id>public gwt interface</id>
                        <phase>process-sources</phase>
                        <goals>
                            <goal>replace</goal>
                        </goals>
                        <configuration>
                            <includes>
                                <include>**/generated-sources/gwt/ru/brbpm/lecm/wm/styles/client/**/*.java</include>
                            </includes>
                            <token>^interface</token>
                            <value>public interface</value>
                        </configuration>
                    </execution>
                </executions>


                <configuration>
                    <regex>true</regex>
                    <regexFlags>
                        <regexFlag>MULTILINE</regexFlag>
                    </regexFlags>
                    <unescape>true</unescape>
                </configuration>

            </plugin>

            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>gwt-maven-plugin</artifactId>
                <configuration>
                    <cssFiles>
                        <cssFile>ru/brbpm/lecm/wm/styles/client/MainStyle.css</cssFile>
                        <cssFile>ru/brbpm/lecm/wm/styles/client/Sprites.css</cssFile>
                        <cssFile>ru/brbpm/lecm/wm/styles/client/Controls.css</cssFile>
                        <cssFile>ru/brbpm/lecm/wm/styles/client/widgets/HorizontalScrollbar.css</cssFile>
                        <cssFile>ru/brbpm/lecm/wm/styles/client/widgets/ScrollPanel.css</cssFile>
                        <cssFile>ru/brbpm/lecm/wm/styles/client/widgets/VerticalScrollbar.css</cssFile>
                        <cssFile>ru/brbpm/lecm/wm/styles/client/widgets/InfiniteDataGrid.css</cssFile>
                    </cssFiles>
                </configuration>

                <executions>
                    <execution>
                        <goals>
                            <goal>css</goal>
                            <!--<goal>resources</goal>-->
                        </goals>
                    </execution>
                </executions>
            </plugin>


        </plugins>
    </build>

</project>