adding support to compile less files inside a plugin

LesscssResourcesGrailsPlugin.groovy

@@ -1,6 +1,6 @@
 class LesscssResourcesGrailsPlugin {
     // the plugin version
-    def version = "0.6"
+    def version = "0.6.1-SNAPSHOT"
     // the version or versions of Grails the plugin is designed for
     def grailsVersion = "1.3.5 > *"
     // the other plugins this plugin depends on

grails-app/resourceMappers/LesscssResourceMapper.groovy

@@ -1,6 +1,8 @@
 import com.asual.lesscss.LessEngine
 import com.asual.lesscss.LessException
 import org.grails.plugin.resource.mapper.MapperPhase
+import org.codehaus.groovy.grails.plugins.GrailsPluginUtils
+import grails.util.PluginBuildSettings
 
 /**
  * @author Paul Fairless
@@ -9,12 +11,16 @@ import org.grails.plugin.resource.mapper.MapperPhase
  */
 import org.codehaus.groovy.grails.commons.ApplicationHolder as AH
 import org.codehaus.groovy.grails.commons.GrailsResourceUtils
+import org.springframework.util.AntPathMatcher
 
 class LesscssResourceMapper {
     def phase = MapperPhase.GENERATION // need to run early so that we don't miss out on all the good stuff
 
     static defaultExcludes = ['**/*.js','**/*.png','**/*.gif','**/*.jpg','**/*.jpeg','**/*.gz','**/*.zip']
     static String LESS_FILE_EXTENSION = '.less'
+    static String PLUGIN_PREFIX = '/plugins/'
+    static final PATH_MATCHER = new AntPathMatcher()
+
 
     def map(resource, config){
         File originalFile = resource.processedFile
@@ -50,6 +56,32 @@ class LesscssResourceMapper {
     }
 
     private File getOriginalFileSystemFile(String sourcePath) {
-        new File(GrailsResourceUtils.WEB_APP_DIR + sourcePath);
+        def resourceFile
+        if(isPlugin(sourcePath)){
+            def pluginFullName = getPluginFullName(sourcePath)
+            def resourcePath = getResourceRelativePath(pluginFullName, sourcePath)
+
+            def ourPluginInfo = GrailsPluginUtils.getPluginInfos().find{pluginInfo -> pluginFullName.contains(pluginInfo.name)}
+            resourceFile = new File(ourPluginInfo.pluginDir.path + '/' + GrailsResourceUtils.WEB_APP_DIR + '/' + resourcePath)
+
+            if(resourceFile.exists()){
+                return resourceFile
+            }
+        }
+
+        return new File(GrailsResourceUtils.WEB_APP_DIR + sourcePath)
+    }
+
+    private getPluginFullName(sourcePath){
+        def pluginMap = PATH_MATCHER.extractUriTemplateVariables(PLUGIN_PREFIX + '{plugin}/**', sourcePath)
+        pluginMap.get('plugin')
+    }
+
+    private getResourceRelativePath(pluginName, sourcePath){
+        PATH_MATCHER.extractPathWithinPattern(PLUGIN_PREFIX+ pluginName +'/**', sourcePath)
+    }
+
+    private isPlugin(String original){
+        PATH_MATCHER.match(PLUGIN_PREFIX + '**', original)
     }
 }