More build.xml massaging.

Backporting auto starr download to 2.8.x and 2.9.x build.xmls.
Trying to get build strings consistent.

Author: paulp

build.xml

@@ -192,13 +192,22 @@ PROPERTIES
 INITIALISATION
 ============================================================================ -->
 
-  <target name="init">
+  <condition property="starr.absent">
+    <not><available file="${lib.dir}/scala-library.jar"/></not>
+  </condition>
+
+  <target name="init.starr" if="starr.absent">
+    <echo level="warn" message="Downloading bootstrap libs.  (To do this by hand, run ./pull-binary-libs.sh)"/>
+    <exec osfamily="unix" vmlauncher="false" executable="./pull-binary-libs.sh" failifexecutionfails="true" />
+    <exec osfamily="windows" vmlauncher="false" executable="pull-binary-libs.sh" failifexecutionfails="true" />
+  </target>
+
+  <target name="init" depends="init.starr">
   <!-- scalac.args.optimise is selectively overridden in certain antcall tasks. -->
     <property name="scalac.args.optimise" value=""/>
   <!-- scalac.args.quickonly are added to quick.* targets but not others (particularly, locker.)
        This is to facilitate testing new command line options which do not yet exist in starr. -->
-	<property name="scalac.args.quickonly" value=""/>
-	
+  <property name="scalac.args.quickonly" value=""/>
     <property name="scalac.args.all" value="${scalac.args} ${scalac.args.optimise}"/>
 	<property name="scalac.args.quick" value="${scalac.args.all} ${scalac.args.quickonly}"/>
   <!-- Setting-up Ant contrib tasks -->
@@ -212,24 +221,27 @@ INITIALISATION
     <condition property="os.win">
       <os family="windows"/>
     </condition>
-  <!-- Finding out SVN revision -->
-    <exec executable="svn" outputproperty="svn.out"
-      failifexecutionfails="false">
-      <arg line=" info ${basedir}"/>
-    </exec>
-    <propertyregex
-      property="svn.number" input="${svn.out}" select="\1"
-      regexp="Revision: ([0-9]+)"
-      defaultValue="0"/>
+    
+    <exec osfamily="unix" executable="tools/get-scala-revision" outputproperty="git.describe" failifexecutionfails="false" />
+    <exec osfamily="windows" executable="tools/get-scala-revision.bat" outputproperty="git.describe" failifexecutionfails="false" />
+    <!-- some default in case something went wrong getting the revision -->
+    <property name="git.describe" value="-unknown-"/>
     <property name="init.avail" value="yes"/>
-  <!-- Generating version number -->
+
+    <!-- Generating version number -->
     <property file="${basedir}/build.number"/>
     <property
       name="version.number"
-      value="${version.major}.${version.minor}.${version.patch}.r${svn.number}-b${time.short}"/>
-  <!-- And print-out what we are building -->
-    <echo level="info" message="Build number is '${version.number}'"/>
-    <echo level="info" message="Built ${time.human} from revision ${svn.number} with ${java.vm.name} ${java.version}"/>
+      value="${version.major}.${version.minor}.${version.patch}.${git.describe}"/>
+
+    <!-- And print-out what we are building -->
+    <echo message="       build time: ${time.human}" />
+    <echo message="     java version: ${java.vm.name} ${java.version}" />
+    <echo message="        java args: ${env.ANT_OPTS} ${jvm.opts}" />
+    <echo message="       javac args: ${javac.args}" />
+    <echo message="      scalac args: ${scalac.args}" />
+    <echo message="     build number: ${version.number}" />
+
   <!-- Define tasks that can be run with Starr -->
     <path id="starr.classpath">
       <pathelement location="${lib.starr.jar}"/>

tools/get-scala-revision.bat

@@ -0,0 +1,22 @@
+@echo off
+rem
+rem Usage: get-scala-revison.bat [dir]
+rem Figures out current scala revision of a git clone.
+rem
+rem If no dir is given, current working dir is used.
+
+@setlocal
+set _DIR=
+if "%*"=="" (
+  for /f "delims=;" %%i in ('cd') do set "_DIR=%%i"
+) else (
+  set "_DIR=%~1"
+)
+cd %_DIR%
+
+if exist .git\NUL (
+  git describe HEAD --abbrev=7 --match dev
+)
+
+:end
+@endlocal