Move all lua related files to lua/ subfolder

Also remove the lexers sub directory from the Lua search path.
As a result we attempt to open fewer files during startup:

 $ strace -e open -o log ./vis +q config.h && wc -l log

In order to avoid having to modifiy all lexers which `require('lexer')`
we instead place a symlink in the top level directory.

 $ ./configure --disable-lua
 $ rm -rf lua

Should result in a source tree with most lua specifc functionality
removed.

1 files changed, 0 insertions, 29 deletions

diff --git a/lexers/rhtml.lua b/lexers/rhtml.lua
deleted file mode 100644
index 3886e20..0000000
--- a/lexers/rhtml.lua
+++ /dev/null
@@ -1,29 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- RHTML LPeg lexer.
-
-local l = require('lexer')
-local token, word_match = l.token, l.word_match
-local P, R, S = lpeg.P, lpeg.R, lpeg.S
-
-local M = {_NAME = 'rhtml'}
-
--- Embedded in HTML.
-local html = l.load('html')
-
--- Embedded Ruby.
-local ruby = l.load('rails')
-local ruby_start_rule = token('rhtml_tag', '<%' * P('=')^-1)
-local ruby_end_rule = token('rhtml_tag', '%>')
-l.embed_lexer(html, ruby, ruby_start_rule, ruby_end_rule)
-
-M._tokenstyles = {
-  rhtml_tag = l.STYLE_EMBEDDED
-}
-
-local _foldsymbols = html._foldsymbols
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '<%%'
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '%%>'
-_foldsymbols.rhtml_tag = {['<%'] = 1, ['%>'] = -1}
-M._foldsymbols = _foldsymbols
-
-return M