From 0f4818cd5d594f044a65e5beaf4a8b296ed00bc6 Mon Sep 17 00:00:00 2001
From: chapulina <louise@openrobotics.org>
Date: Fri, 23 Aug 2019 17:56:20 -0700
Subject: [PATCH] [ros2] Conditional launch includes (#979)

* [ros2] Conditional launch includes

Signed-off-by: Louise Poubel <louise@openrobotics.org>

* remove unused import

Signed-off-by: Louise Poubel <louise@openrobotics.org>
---
 gazebo_ros/launch/gazebo.launch.py | 13 +++++++++++--
 gazebo_ros/package.xml             |  2 ++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/gazebo_ros/launch/gazebo.launch.py b/gazebo_ros/launch/gazebo.launch.py
index 6fba9dd68..2e993c51b 100644
--- a/gazebo_ros/launch/gazebo.launch.py
+++ b/gazebo_ros/launch/gazebo.launch.py
@@ -15,21 +15,30 @@
 """Launch Gazebo server and client with command line arguments."""
 
 from launch import LaunchDescription
+from launch.actions import DeclareLaunchArgument
 from launch.actions import IncludeLaunchDescription
+from launch.conditions import IfCondition
 from launch.launch_description_sources import PythonLaunchDescriptionSource
+from launch.substitutions import LaunchConfiguration
 from launch.substitutions import ThisLaunchFileDir
 
 
 def generate_launch_description():
 
-    # (TODO) Allow conditional include of gzserver and gzclient, once supported
-    # https://github.com/ros2/launch/issues/303
     return LaunchDescription([
+        DeclareLaunchArgument('gui', default_value='true',
+                              description='Set to "false" to run headless.'),
+
+        DeclareLaunchArgument('server', default_value='true',
+                              description='Set to "false" not to run gzserver.'),
+
         IncludeLaunchDescription(
             PythonLaunchDescriptionSource([ThisLaunchFileDir(), '/gzserver.launch.py']),
+            condition=IfCondition(LaunchConfiguration('server'))
         ),
 
         IncludeLaunchDescription(
             PythonLaunchDescriptionSource([ThisLaunchFileDir(), '/gzclient.launch.py']),
+            condition=IfCondition(LaunchConfiguration('gui'))
         ),
     ])
diff --git a/gazebo_ros/package.xml b/gazebo_ros/package.xml
index b483071b9..8035043b8 100644
--- a/gazebo_ros/package.xml
+++ b/gazebo_ros/package.xml
@@ -30,6 +30,8 @@
   <depend>std_srvs</depend>
   <depend>tinyxml_vendor</depend>
 
+  <exec_depend>launch_ros</exec_depend>
+
   <build_export_depend>geometry_msgs</build_export_depend>
   <build_export_depend>sensor_msgs</build_export_depend>