feat: add support for fish

- ament/ament_package#164
- ros2#326

Signed-off-by: sunrisepeak <speakshen@163.com>

Author: Sunrisepeak

ros2cli/colcon.pkg

@@ -1,6 +1,7 @@
 {
     "hooks": [
         "share/ros2cli/environment/ros2-argcomplete.bash",
+        "share/ros2cli/environment/ros2-argcomplete.fish",
         "share/ros2cli/environment/ros2-argcomplete.zsh"
     ]
 }

ros2cli/completion/ros2-argcomplete.fish

@@ -0,0 +1,23 @@
+# Copyright 2017-2026 Open Source Robotics Foundation, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Register ros2 tab-completion for fish shell via argcomplete.
+# Use "| source" (pipe into source) so that multi-line output is handled
+# correctly — fish command substitution (…) would join lines with spaces.
+
+if type -q register-python-argcomplete
+    register-python-argcomplete --shell fish ros2 | source
+else if type -q register-python-argcomplete3
+    register-python-argcomplete3 --shell fish ros2 | source
+end

ros2cli/resource/package.dsv

@@ -1,2 +1,3 @@
 source;share/ros2cli/environment/ros2-argcomplete.bash
+source;share/ros2cli/environment/ros2-argcomplete.fish
 source;share/ros2cli/environment/ros2-argcomplete.zsh

ros2cli/setup.py

@@ -21,7 +21,8 @@
         ]),
         ('share/ros2cli/environment', [
             'completion/ros2-argcomplete.bash',
-            'completion/ros2-argcomplete.zsh'
+            'completion/ros2-argcomplete.fish',
+            'completion/ros2-argcomplete.zsh',
         ]),
     ],
     package_data={'': ['py.typed']},