An extension for colcon-core to allow running from any subfolder of a workspace.
This package allows running colcon from any subfolder of a colcon workspace, but reusing
existing build, install, and log folders from the root folder of the workspace.
The root of the workspace is determined by looking for the .colcon_root marker file, which is created on first invocation.
Alternatively, the existence of build, install, and log folders indicates the root folder.
Package discovery is done relative to the current working directory. Thus, to build all packages in the current folder, just run colcon build.
To build all packages in the workspace, specify the special token ROOT for the --base-paths argument: colcon build --base-paths ROOT.