Initial commit.

Creating the standard Autotools infrastructure and adding the
first extensions (the Hello, World! provided by the wizard).

.gitignore

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+Makefile
+Makefile.in
+Makefile.in.in
+configure
+config.log
+config.status
+config/
+aclocal.m4
+autom4te.cache/
+m4/
+po/POTFILES
+po/stamp-it

HACKING

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+To create a new extension, add a subdirectory in extensions.
+Then create a Makefile.am like the one in example, replacing
+the EXTENSION_ID with the basename of your extension, which
+must match the UUID in metadata.json.
+If you need additional files, add them to EXTENSION_EXTRA.
+
+Then modify extensions/Makefile.am and configure.ac. It should
+be pretty self-explanatory.
+
+Don't forget to add any translatable file to po/POTFILES.in, and
+then you're done.

Makefile.am

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+ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
+
+SUBDIRS = extensions

README

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+GNOME Shell Extensions is a collection of extensions providing additional
+and optional functionality to GNOME Shell.
+Since GNOME Shell is not API stable, extensions work only against a very
+specific version of the shell, usually the same as this package (see
+"configure --version"). Also, since extensions are built from many
+individual contributors, we cannot guarantee stability or quality for any
+specific extension.
+For these reasons, distributions are advised to avoid installing or packaging
+this module by defaul.
+
+For more information about GNOME Shell Extensions
+ http://live.gnome.org/GnomeShell/Extensions
+
+For general information about GNOME Shell
+ http://live.gnome.org/GnomeShell
+
+Bugs should be reported at http://bugzilla.gnome.org against the 'gnome-shell'
+product, with the 'extensions' component.
+
+License
+=======
+GNOME Shell Extensions are distributed under the terms of the GNU General Public License,
+version 2 or later. See the COPYING file for details.
+Individual extensions may be licensed under different terms, see each source
+file for details.
+

autogen.sh

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+#!/bin/bash
+# Run this to generate all the initial makefiles, etc.
+
+srcdir=`dirname $0`
+test -z "$srcdir" && srcdir=.
+
+PKG_NAME="gnome-shell-extensions"
+
+test -f $srcdir/configure.ac || {
+    echo -n "**Error**: Directory "\`$srcdir\'" does not look like the"
+    echo " top-level gnome-shell-extensions directory"
+    exit 1
+}
+
+which gnome-autogen.sh || {
+    echo "You need to install gnome-common from GNOME Git (or from"
+    echo "your OS vendor's package manager)."
+    exit 1
+}
+. gnome-autogen.sh

configure.ac

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+AC_PREREQ(2.63)
+AC_INIT([gnome-shell-extensions],[2.91.5],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell&component=extensions])
+
+AC_CONFIG_MACRO_DIR([m4])
+AC_CONFIG_AUX_DIR([config])
+
+AM_INIT_AUTOMAKE([1.10 dist-bzip2 no-dist-gzip foreign])
+
+m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
+
+GETTEXT_PACKAGE=gnome-shell-extensions
+AC_SUBST(GETTEXT_PACKAGE)
+AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE, "$GETTEXT_PACKAGE",
+                   [The prefix for our gettext translation domains.])
+IT_PROG_INTLTOOL(0.26)
+
+PKG_PROG_PKG_CONFIG([0.22])
+
+ADDITIONAL_PACKAGES=
+
+dnl keep this in sync with extensions/Makefile.am
+ALL_EXTENSIONS=example
+AC_ARG_ENABLE([extensions],
+	[AS_HELP_STRING([--enable-extensions],[Space separated list of extensions to enable. Default is that all extensions are built.])],
+	[],
+	[enable_extensions=$ALL_EXTENSIONS]
+)
+ENABLED_EXTENSIONS=
+for e in $enable_extensions; do
+	case $e in
+		*example*)
+			ENABLED_EXTENSIONS="$ENABLED_EXTENSIONS example"
+			;;
+		*)
+			AC_MSG_ERROR([invalid extension $e])
+	esac
+done
+
+AC_SUBST(ENABLED_EXTENSIONS, [$ENABLED_EXTENSIONS])
+
+dnl We don't really need cflags or libdirs, we just check
+dnl to ensure we don't fail at runtime.
+
+if test "x$ADDITIONAL_PACKAGES" != x; then
+	PKG_CHECK_MODULES(ADDITIONAL, [$ADDITIONAL_PACKAGES])
+fi
+
+AC_CONFIG_FILES([
+  Makefile
+  extensions/Makefile
+  extensions/example/Makefile
+  po/Makefile.in
+])
+AC_OUTPUT

extension.mk

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+# Change these to modify how installation is performed
+# If you modify extensionbase, you also need to modify
+# metadata.json of each extension
+topextensiondir = $(datadir)/gnome-shell/extensions
+extensionbase = @gnome-shell-extensions.gnome.org
+
+extensiondir = $(topextensiondir)/$(EXTENSION_ID)$(extensionbase)
+
+extension_DATA = metadata.json extension.js stylesheet.css $(EXTRA_EXTENSION)

extensions/Makefile.am

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+DIST_SUBDIRS = example
+
+SUBDIRS = $(ENABLED_EXTENSIONS)

extensions/example/Makefile.am

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+EXTENSION_ID = example
+
+include ../../extension.mk

extensions/example/extension.js

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+// Sample extension code, makes clicking on the panel show a message
+const St = imports.gi.St;
+const Mainloop = imports.mainloop;
+
+const Main = imports.ui.main;
+
+function _showHello() {
+    let text = new St.Label({ style_class: 'helloworld-label', text: "Hello, world!" });
+    let monitor = global.get_primary_monitor();
+    global.stage.add_actor(text);
+    text.set_position(Math.floor (monitor.width / 2 - text.width / 2), Math.floor(monitor.height / 2 - text.height / 2));
+    Mainloop.timeout_add(3000, function () { text.destroy(); });
+}
+
+// Put your extension initialization code here
+function main() {
+    Main.panel.actor.reactive = true;
+    Main.panel.actor.connect('button-release-event', _showHello);
+}

extensions/example/metadata.json

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+{"uuid": "example@gnome-shell-extensions.gnome.org", "name": "Hello, World!", "description": "An example extension to show how it works. Shows Hello, world when clicking on the top panel.", "shell-version": [ "2.91.5" ]}

extensions/example/stylesheet.css

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+/* Example stylesheet */
+.helloworld-label {
+    font-size: 36px;
+    font-weight: bold;
+    color: #ffffff;
+    background-color: rgba(10,10,10,0.7);
+    border-radius: 5px;
+}

po/POTFILES.in

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+extensions/example/extension.js