... you might want to save this as ~/.vim/plugin/ToggleTestPlan.vim.
Or even better, save it as ~/.vim/ftplugin/perl_toggle_test_plan.vim; using the ftplugin/ directory and putting perl_ at the start of its name will ensure it's only loaded for Perl files.
map ,tp :call ToggleTestPlan()<cr>
That would be better written as:
map <buffer> ,tp :call ToggleTestPlan()<cr>
That will make the mapping local to the current buffer, so it won't leak out into other (non-Perl) files you subsequently open in the same Vim session.
Why were they defined like that (with <SID>)? Who knows?
<SID> is the script ID, a unique ID which identifies the source file which has this code in it. By using it like this it allows other scripts also to define a SaveCursorPosition() function without their names clashing. Basically if you're ever defining a function which will only ever be invoked from the current file (or from a mapping defined in the current file) then use <SID>.
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