Colorize IRC nicks

colorizenicks.vim

hi u0 ctermbg=red
hi u1 ctermbg=yellow
hi u2 ctermbg=cyan
hi u3 ctermbg=darkgreen
hi u4 ctermbg=magenta
hi u5 ctermbg=darkred

let all_nicks = []

function! IsolateNicks(key, val)
	return substitute(a:val, '^\[.\{-}\]\s\(<.\{-}>\).*$', '\1', '')
endfunction

function! ColorizeNicks()
	let all_lines = getline(1, '$')
	let all_nicks = uniq(sort(map(all_lines, function('IsolateNicks'))))
	let index = 0
	for nick in all_nicks
		execute 'call matchadd("u' . index . '", "' . nick . '")'
		let index = index + 1
	endfor
endfunction