build: Add utility script to export zip files

We currently do have some Makefile magic to export zip files suitable
for uploading to extensions.gnome.org. As this is not easily replicated
in meson, add a small non-magic script for the same purpose.

Fixes https://gitlab.gnome.org/GNOME/gnome-shell-extensions/issues/31

export-zips.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+srcdir=`dirname $0`
+srcdir=`(cd $srcdir && pwd)`
+
+builddir=`mktemp -p $srcdir -d _build.XXXXXX` || exit 1
+installdir=`mktemp -p $srcdir -d _install.XXXXXX` || exit 1
+
+meson setup --prefix=$installdir -Dextension_set=all $srcdir $builddir
+ninja -C$builddir install
+
+rm -rf $srcdir/zip-files
+mkdir $srcdir/zip-files
+
+extensiondir=$installdir/share/gnome-shell/extensions
+schemadir=$installdir/share/glib-2.0/schemas
+localedir=$installdir/share/locale
+
+for f in $extensiondir/*; do
+  name=`basename ${f%%@*}`
+  uuid=$name@gnome-shell-extensions.gcampax.github.com
+  schema=$schemadir/org.gnome.shell.extensions.$name.gschema.xml
+
+  cp $srcdir/NEWS $srcdir/COPYING $f
+
+  if [ -f $schema ]; then
+    mkdir $f/schemas
+    cp $schema $f/schemas;
+    glib-compile-schemas $f/schemas
+  fi
+
+  (cd $f && zip -rmq $srcdir/zip-files/$uuid.shell-extension.zip .)
+done
+
+rm -rf $builddir
+rm -rf $installdir