Add erlang support

indent/erlang.vim

@@ -0,0 +1,58 @@
+" Vim indent file
+" Language: Erlang
+" Author:   Ricardo Catalinas Jiménez <jimenezrick@gmail.com>
+" License:  Vim license
+" Version:  2013/09/11
+
+if !exists('g:erlang_force_use_vimerl_indent')
+	let g:erlang_force_use_vimerl_indent = 0
+endif
+
+if exists('b:did_indent') || (v:version >= 704 && !g:erlang_force_use_vimerl_indent)
+	finish
+else
+	let b:did_indent = 1
+endif
+
+setlocal indentexpr=ErlangIndent()
+setlocal indentkeys=!^F,o,O,=),=},=],=>>,=of,=catch,=after,=end
+
+if exists('*ErlangIndent')
+	finish
+endif
+
+let s:erlang_indent_file = expand('<sfile>:p:h') . '/erlang_indent.erl'
+if filewritable(expand('<sfile>:p:h')) == 2
+	let s:in_fifo  = expand('<sfile>:p:h') . '/vimerl_in_fifo.' . getpid()
+	let s:out_fifo = expand('<sfile>:p:h') . '/vimerl_out_fifo.' . getpid()
+else
+	let s:in_fifo  = '/tmp/vimerl_in_fifo.' . getpid()
+	let s:out_fifo = '/tmp/vimerl_out_fifo.' . getpid()
+endif
+
+execute 'silent !mkfifo' s:in_fifo
+execute 'silent !mkfifo' s:out_fifo
+execute 'silent !' . s:erlang_indent_file s:out_fifo s:in_fifo '&'
+
+autocmd VimLeave * call <SID>StopIndenter()
+
+function s:StopIndenter()
+	call writefile([], s:out_fifo)
+	call delete(s:in_fifo)
+	call delete(s:out_fifo)
+endfunction
+
+function ErlangIndent()
+	if v:lnum == 1
+		return 0
+	else
+		call writefile([v:lnum] + getline(1, v:lnum), s:out_fifo)
+		let indent = split(readfile(s:in_fifo)[0])
+
+		if len(indent) == 1 || !&expandtab
+			return indent[0] * &shiftwidth
+		else
+			return indent[1]
+		endif
+	endif
+endfunction