VimL: Checking if function exists

Question

right now I\'m cleaning up my .vimrc file to make sure it\'s compatible on most systems.

In my statusline I use a function that another plugin sets, the

Answer 1

Just as an alternative you may also use a regexp to decide if the plugin at hand is in your runtimepath:

if &rtp =~ 'plugin-name'
    ...
endif

This has the advantage that it works with plugins that only have vimscript code in the autoload directory, which in turn can't be detected when .vimrc is initially parsed since the autoload snippets are loaded at the time of a function call.