Suggestion: `colcon.meta` support multiple targets

[jparisu]

Good morning,

I would like to contribute with a suggestions that I (and many of my colleagues) think that it would be an incredibly useful feature (and not very hard to implement).

Current behaviour

colcon.meta allows to set names and paths to find ONE packages and add compilation flags to it.

New desired behaviour

Allow to set compilation flags for many packages at the same time, by using a wildcard, regex or a new parameter in json file to specify which ones.

Example

Current:

{
  "names":
  {
    "package1":
    {
      "cmake-args":
      [
        "-DCMAKE_BUILD_TYPE=Debug"
      ]
    },
    "package2":
    {
      "cmake-args":
      [
        "-DCMAKE_BUILD_TYPE=Debug"
      ]
    }
  }
}

Desired:

{
  "names":
  {
    "package*":
    {
      "cmake-args":
      [
        "-DCMAKE_BUILD_TYPE=Debug"
      ]
    }
  }
}