Add erlang support

ftplugin/erlang.vim

@@ -0,0 +1,85 @@
+" Vim ftplugin file
+" Language:     Erlang
+" Author:       Oscar Hellström <oscar@oscarh.net>
+" Contributors: Ricardo Catalinas Jiménez <jimenezrick@gmail.com>
+"               Eduardo Lopez (http://github.com/tapichu)
+" License:      Vim license
+" Version:      2012/11/25
+
+if exists('b:did_ftplugin')
+	finish
+else
+	let b:did_ftplugin = 1
+endif
+
+if exists('s:did_function_definitions')
+	call s:SetErlangOptions()
+	finish
+else
+	let s:did_function_definitions = 1
+endif
+
+if !exists('g:erlang_keywordprg')
+	let g:erlang_keywordprg = 'erl -man'
+endif
+
+if !exists('g:erlang_folding')
+	let g:erlang_folding = 0
+endif
+
+let s:erlang_fun_begin = '^\(\a\w*\|[''][^'']*['']\)(.*$'
+let s:erlang_fun_end   = '^[^%]*\.\s*\(%.*\)\?$'
+
+function s:SetErlangOptions()
+	compiler erlang
+	if version >= 700
+		setlocal omnifunc=erlang_complete#Complete
+	endif
+
+	if g:erlang_folding
+		setlocal foldmethod=expr
+		setlocal foldexpr=GetErlangFold(v:lnum)
+		setlocal foldtext=ErlangFoldText()
+	endif
+
+	setlocal comments=:%%%,:%%,:%
+	setlocal commentstring=%%s
+	setlocal formatoptions+=ro
+	setlocal suffixesadd=.erl
+	let libs = substitute(system('which erl'), '/bin/erl', '/lib/erlang/lib/**/src/', '')
+	execute 'setlocal path+=' . libs
+	let &l:keywordprg = g:erlang_keywordprg
+endfunction
+
+function GetErlangFold(lnum)
+	let lnum = a:lnum
+	let line = getline(lnum)
+
+	if line =~ s:erlang_fun_end
+		return '<1'
+	endif
+
+	if line =~ s:erlang_fun_begin && foldlevel(lnum - 1) == 1
+		return '1'
+	endif
+
+	if line =~ s:erlang_fun_begin
+		return '>1'
+	endif
+
+	return '='
+endfunction
+
+function ErlangFoldText()
+	let line    = getline(v:foldstart)
+	let foldlen = v:foldend - v:foldstart + 1
+	let lines   = ' ' . foldlen . ' lines: ' . substitute(line, "[ \t]*", '', '')
+	if foldlen < 10
+		let lines = ' ' . lines
+	endif
+	let retval = '+' . v:folddashes . lines
+
+	return retval
+endfunction
+
+call s:SetErlangOptions()