LinuxQuestions.org - Z shell tab completion: Is it possible to define a new "pre-command"?

I am trying to write a zstyle ":completion:*" or similar rule that completes command names upon tab completion, similar to the pre-defined rules for commands like nice, nohup, exec, or sudo.

The commands in this case are those for MPI programs; for example, let's say that

Code:

mpiexec -n 4 my_[TAB]

would expand to

Code:

mpiexec -n 4 my_program

assuming my_program existed and could be found in the current hash table from $PATH.

I tried

Code:

compdef "_precommand" mpiexec

but that only completes commands if you leave out the "-n 4" in the above example.

I'm hoping it's something like,

Code:

zstyle ":completion:*:mpiexec:argument-3:" commands

Thanks!