[zsh] Add android help functions

.zsh/40_function.zsh

@@ -89,3 +89,56 @@ if [[ $BATTERY -gt 0 ]] ; then
     fi
 fi
 }
+
+mgrep () {
+    find . -name .repo -prune -o -name .git -prune -o -path ./out -prune -o -regextype posix-egrep -iregex '(.*\/Makefile|.*\/Makefile\..*|.*\.make|.*\.mak|.*\.mk)' -type f -print0 | xargs -0 grep --color -n "$@"
+}
+
+cgrep () {
+    find . -name .repo -prune -o -name .git -prune -o -type f \( -name '*.c' -o -name '*.cc' -o -name '*.cpp' -o -name '*.h' \) -print0 | xargs -0 grep --color -n "$@"
+}
+
+jgrep () {
+    find . -name .repo -prune -o -name .git -prune -o -type f -name "*\.java" -print0 | xargs -0 grep --color -n "$@"
+}
+
+resgrep () {
+    for dir in `find . -name .repo -prune -o -name .git -prune -o -name res -type d`
+        do
+            find $dir -type f -name '*\.xml' -print0 | xargs -0 grep --color -n "$@"
+                done
+}
+
+gettop () 
+{ 
+    local TOPFILE=build/core/envsetup.mk;
+    if [ -n "$TOP" -a -f "$TOP/$TOPFILE" ]; then
+        echo $TOP;
+    else
+        if [ -f $TOPFILE ]; then
+            PWD= /bin/pwd;
+        else
+            local HERE=$PWD;
+    T=;
+    while [ \( ! \( -f $TOPFILE \) \) -a \( $PWD != "/" \) ]; do
+        \cd ..;
+    T=`PWD= /bin/pwd`;
+    done;
+    \cd $HERE;
+    if [ -f "$T/$TOPFILE" ]; then
+        echo $T;
+    fi;
+    fi;
+    fi
+}
+
+croot ()
+{
+    T=$(gettop);
+    if [ "$T" ]; then
+        \cd $(gettop);
+    else
+        echo "Couldn't locate the top of the tree.  Try setting TOP.";
+    fi
+}
+