vim remove non existing mapping [closed]

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It fails because do_map returns 2 for unknown mapping and this code throws error for this case. Not very helpful, I guess. Annotate says that this code did not change from the very first version of vim found in the mercurial repository (7.0001).

There may be different answers: I can guess of three:

  1. vi compatibility: vi did throw and so should vim do
  2. it is right thing to do: if command did not do what it was requested to do it should report failure
  3. it provides more options: if unmapping an existing mapping is essential you can catch the error using :try..:catch (or leave as-is indicating the error to user), if it is not there is always silent!. Argument for EAFP principle adepts and users with tiny vim though: in VimL using maparg() to check for existence is more common, but it requires +eval (if I am not mistaking :try does this as well: the whole meaningful ex_eval.c file contents where this command is defined is guarded with #if defined(FEAT_EVAL) || defined(PROTO)).

But Stackoverflow is not the right place to ask such questions. For such old code only Bram may know the answer and thus the question should be asked on vim-dev. If I were him I would ask an explanation why you need the answer though.

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