tree 551a9588a3f1daaefc62134d892fa30ca4c1560e
parent 5b949bbb9114379120c29134b5effd77e39dd134
author Alex Reinking <alex.reinking@gmail.com> 1660466531 -0400
committer Alex Reinking <alex.reinking@gmail.com> 1660755279 -0400

cmake -E env: Add --modify flag

When `cmake -E env` is given the `--modify` flag, try to parse the
following argument as an `ENVIRONMENT_MODIFICATION` operation and apply
it to the environment.

This generalizes `--unset=`:

1.  When implementing `ENVIRONMENT_MODIFICATION` features for other CMake
    commands, the `MYVAR=OP:VALUE` strings do not need to be translated
    to OP-specific flags.
2.  This provides a natural and consistent extension point to introduce
    new operations without introducing very many flags.
3.  Users need to learn only one syntax to access the same functionality.

There is one difference between the behavior here as compared to CTest's
interpretation of the `ENVIRONMENT_MODIFICATION` test property.
The `MYVAR=reset:` command when run in `cmake -E env` will reset `MYVAR`
to whatever its value was when `cmake -E env` launched, rather than try
to checkpoint after plain `MYVAR=VALUE` options.  This makes `MYVAR=VALUE`
and `--modify MYVAR=set:VALUE` semantically equivalent.