support and instructions for building Python plugin from command line

python/README.md

@@ -14,3 +14,14 @@ To run the test suite, use the built-in JUnit test runner and run all tests in t
 
 To build the distribution archive of PyCharm Community Edition, execute build.xml Ant build script in this directory. The results of the
 build execution can be found at out/artifacts.
+
+## Building the Python Plugin
+
+To build the Python plugin for IntelliJ IDEA Community Edition:
+
+ * Download the .tar.gz distribution of the most recent EAP or release build of IntelliJ IDEA Community Edition;
+ * Run the following command:
+
+   ant -Didea.path=<download path> -Didea.build.number=<build number of the build you're using> plugin
+
+The .zip file of the built plugin will be placed at distCE/python-community-<branch number>.SNAPSHOT.zip

python/build.xml

@@ -17,10 +17,11 @@
     <attribute name="script" />
     <sequential>
       <java failonerror="true" jar="${project.home}/lib/ant/lib/ant-launcher.jar" fork="true">
-        <jvmarg line="-Xmx612m -XX:MaxPermSize=152m"/>
+        <jvmarg line="-Xmx612m -XX:MaxPermSize=152m -Didea.build.number=${idea.build.number} -DideaPath=${idea.path}"/>
 
         <arg line="&quot;-Dgant.script=@{script}&quot;"/>
         <arg line="&quot;-Dteamcity.build.tempDir=${tmp.dir}&quot;"/>
+        <arg line="&quot;-Didea.build.number=${idea.build.number}&quot;"/>
         <arg line="&quot;-Didea.test.group=ALL_EXCLUDE_DEFINED&quot;"/>
         <arg value="-f"/>
         <arg value="${project.home}/build/gant.xml"/>
@@ -32,6 +33,9 @@
     <call_gant script="${python.home}/build/pycharm_community_build.gant"/>
   </target>
 
+  <target name="plugin" depends="init">
+    <call_gant script="${python.home}/build/python_plugin_build.gant"/>
+  </target>
   <!--
   <target name="test" depends="init">
     <call_gant script="${project.home}/build/scripts/tests.gant"/>

python/build/python_plugin_build.gant

@@ -7,6 +7,7 @@ includeTargets << new File("${projectHome}/build/scripts/utils.gant")
 
 setProperty("outDir", "${projectHome}/out/python")
 setProperty("ideaDir", "${outDir}/ideaCE")
+requireProperty("ideaPath", ideaDir)
 
 setProperty("pluginHelp", "${outDir}/help")
 
@@ -71,8 +72,8 @@ target(name: "clean", description: "Cleanup output") {
 
 target(name: "unzip") {
   ant.mkdir(dir: "${ideaHomePacked}")
-  ant.gunzip(src: "${ideaDir}/ideaIC-${ideaBuildNumber}.tar.gz")
-  ant.untar(src: "${ideaDir}/ideaIC-${ideaBuildNumber}.tar", dest: "${ideaHomePacked}")
+  ant.gunzip(src: "${ideaPath}/ideaIC-${ideaBuildNumber}.tar.gz")
+  ant.untar(src: "${ideaPath}/ideaIC-${ideaBuildNumber}.tar", dest: "${ideaHomePacked}")
 }
 
 target(name: "compile", description: "Compile module python") {