Rename ...using_command fish function, set $cmd in local scope
#377
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This PR has two minor changes for FishCompletionsGenerator.swift.
The first is related to the name of the fish function created that's used to determine whether to show completions or not, depending on the commandline entered thus far. Functions beginning with
__fishreally ought only be things internal to fish that are included with the shell. So prefix the function_swiftinstead.Secondly,
set --local cmdinstead ofset cmd- this ensures running the function does not accidentally clobber a global or universal variable.