feat: Add final parol6 assignment

.fish/activate.fish

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+# Self-contained environment: ros2-lectures
+# Exported on: Thu Nov 13 06:53:17 PM CET 2025
+# Original environment from: /home/wessel/.config/fish/environments/configs/ros2-lectures
+
+# ROS2 development environment (requires distrobox)
+# Environment: ros2-lectures
+
+# First check if running inside distrobox
+if not test -f /run/.containerenv; and test -z "$CONTAINER_ID"
+    echo (set_color red)"This ROS2 environment should only be run inside a distrobox container"(set_color normal)
+    return 1
+end
+
+# Check if a previous initialization has occurred
+if test -n "$__ENV_INITIALIZED"
+    echo (set_color yellow)"Environment already initialized"(set_color normal)
+    return 0
+end
+
+# Mark as initialized (only after distrobox check passes)
+set -gx __ENV_INITIALIZED "1"
+set -gx CURRENT_ENV "ros2-lectures"
+# Source ROS2 setup files using bass
+if type -q bass
+    bass source /opt/ros/jazzy/setup.bash
+    if test -f ./install/setup.bash
+        bass source ./install/setup.bash
+    end
+else
+    echo (set_color red)"Error: bass is required for ROS2 environment. Install with: fisher install edc/bass"(set_color normal)
+    return 1
+end
+
+# Set environment variable for the prompt prefix
+set -gx ROS2_ACTIVE 1
+
+# Save the original prompt function if it exists
+# Only save if we don't already have a backup or if current prompt is not from an environment
+if not functions -q __env_orig_prompt
+    if functions -q fish_prompt
+        functions -c fish_prompt __env_orig_prompt
+    else
+        function __env_orig_prompt
+            echo -n (whoami)'@'(prompt_hostname)' '(set_color $fish_color_cwd)(prompt_pwd)(set_color normal)'> '
+        end
+    end
+else
+    # If we already have a backup, we're switching environments
+    # No need to create a new backup
+end
+
+# Define new prompt with ROS2 prefix
+function fish_prompt
+    echo -n (set_color magenta)'(ros2-lectures)'(set_color normal)' '
+    __env_orig_prompt
+end
+
+# ROS2 aliases and functions
+alias cb="colcon build"
+alias cbe="colcon build && env deactivate && cd ."
+alias cbs="colcon build --symlink-install"
+alias cbt="colcon build --packages-select"
+alias ct="colcon test"
+alias ctr="colcon test-result"
+
+echo (set_color green)"Activated ROS2 environment: ros2-lectures"(set_color normal)
+
+# Custom deactivation function
+function __env_custom_deactivate
+    # Remove ROS2-specific variables and aliases
+    set -e ROS2_ACTIVE
+    functions -e cb cbs cbt ct ctr 2>/dev/null
+
+    echo (set_color blue)"ROS2 environment cleanup completed"(set_color normal)
+end

.fish/readme.norg

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+* Exported Fish Environment: ros2-lectures
+This directory contains a self-contained fish environment.
+
+** Files Structure
+   @code
+   .fish/
+   |-- activate.fish
+   |-- readme.norg
+   |-- bin/
+   @end
+
+** Usage
+
+*** Automatic Activation (Recommended)
+    The environment will automatically activate when you `cd` into this directory
+    if your Fish shell is configured with the auto-activation script.
+
+    @code fish
+    function check_and_source_activate
+      if test -f (pwd)/.fish/activate.fish
+        source (pwd)/.fish/activate.fish
+      elif test -f (pwd)/activate.fish
+        source (pwd)/activate.fish
+      end
+    end
+
+    function cd
+      builtin cd $argv && check_and_source_activate
+    end
+    @end
+
+*** Manual Activation
+    To manually activate the environment, run from the project root:
+    @code bash
+    source ./.fish/activate.fish
+    @end
+
+*** Deactivation
+    To deactivate the environment, run:
+    @code bash
+    env deactivate
+    @end
+
+    Or simply `cd` to a different directory if using auto-activation.
+
+** What This Environment Provides
+   - Prompt showing the environment name
+   - Environment-specific aliases and functions
+   - Custom environment variables
+   - Automatic cleanup when deactivated
+
+** Requirements
+   - Fish shell
+   - `bass` plugin (`fisher install edc/bass`) for compatibility with bash scripts
+
+** Sharing
+   This environment is completely self-contained. You can:
+   - Copy this directory to another machine
+   - Share it with others
+   - Version control it with your project (add .fish/ to your repo)