Setup catkin with unified compile commands for all packages

cc_setup.bash

#! /usr/bin/bash

# Run: `catkin config --append-args --cmake-args "-DCMAKE_EXPORT_COMPILE_COMMANDS=1"` to setup catkin correctly. 

export ROS_WS_DIR=`catkin locate` || { echo "Not in a catkin workspace." ; exit 1; } 

source /opt/ros/noetic/setup.bash
[[ -f ./devel/setup.bash ]] && source ./devel/setup.bash

echo -ne "[\n]" > $ROS_WS_DIR/.catkin_tools/CATKIN_BUILD_DUMMY.json

unalias catkin_build
catkin_build() {
    catkin build $@
    ( shopt -s nullglob && cat $ROS_WS_DIR/.catkin_tools/CATKIN_BUILD_DUMMY.json $ROS_WS_DIR/build/*/compile_commands.json $ROS_WS_DIR/.catkin_tools/CATKIN_BUILD_DUMMY.json | sed 's:\]\[:,:' > "${ROS_WS_DIR}/src/compile_commands.json" ; )    
    # zsh only
    # cat $ROS_WS_DIR/.catkin_tools/CATKIN_BUILD_DUMMY.json $ROS_WS_DIR/build/*/compile_commands.json(N) $ROS_WS_DIR/.catkin_tools/CATKIN_BUILD_DUMMY.json | sed 's:\]\[:,:' > "${ROS_WS_DIR}/src/compile_commands.json"
}

# Now use catkin_build to build. Open ./src/compile_commands.json in Clion to view the entire workspace.