Add a --fast option to to_jetty.sh to reduce build times

This is "unsafe" as it may miss changes in gwtorm, gwtjsonrpc, jgit
or mina_sshd, but it runs in 38 seconds vs. 2 minutes to do a full
clean build and test.  It also packages too much into the WAR, old
compiled copies of the JavaScript are left laying around.

Signed-off-by: Shawn O. Pearce <sop@google.com>

to_jetty.sh

@@ -3,9 +3,10 @@
 # Builds and deploys into Jetty; primarily for debugging
 
 jetty=$1
+fast=$2
 if [ -z "$jetty" ]
 then
-	echo >&2 "usage: $0 jettydir"
+	echo >&2 "usage: $0 jettydir [--fast]"
 	exit 1
 fi
 if ! [ -f "$jetty/etc/jetty.xml" ]
@@ -14,13 +15,21 @@ then
 	exit 1
 fi
 
-(cd appdist && mvn clean install) &&
-
-out=$(cd appdist/target/gerrit-*-bin.dir/gerrit-* && pwd) &&
 ctx="$jetty/contexts/gerrit.xml" &&
 
-cp $out/www/gerrit-*.war "$jetty/webapps/gerrit.war" &&
+if [ -f "$ctx" -a -n "$fast" ]
+then
+	echo >&2 "warning: Using fast mode to build only GWT..."
+	echo >&2
+	(cd appjar && mvn install) &&
+	(cd appwar && mvn package) &&
+	cp appwar/target/gerrit-*.war "$jetty/webapps/gerrit.war" &&
+	touch "$ctx"
+else
+	(cd appdist && mvn clean install) &&
+	out=$(cd appdist/target/gerrit-*-bin.dir/gerrit-* && pwd) &&
 
+	cp $out/www/gerrit-*.war "$jetty/webapps/gerrit.war" &&
 	if [ -f "$ctx" ]
 	then
 		touch "$ctx"
@@ -30,5 +39,8 @@ else
 
 		rm -f "$jetty/contexts/test.xml" &&
 		cp $out/www/jetty_gerrit.xml "$ctx" &&
-	echo "You need to edit and configure $ctx"
+
+		echo >&2 &&
+		echo >&2 "You need to edit and configure $ctx"
+	fi
 fi