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, 32 deletions

diff --git a/lexers/sass.lua b/lexers/sass.lua
deleted file mode 100644
index 002df27..0000000
--- a/lexers/sass.lua
+++ /dev/null
@@ -1,32 +0,0 @@
--- Copyright 2006-2013 Robert Gieseke. See LICENSE.
--- Sass CSS preprocessor LPeg lexer.
--- http://sass-lang.com
-
-local l = require('lexer')
-local token = l.token
-local P, S = lpeg.P, lpeg.S
-
-local M = {_NAME = 'sass'}
-
--- Line comments.
-local line_comment = token(l.COMMENT, '//' * l.nonnewline^0)
-
--- Variables.
-local variable = token(l.VARIABLE, '$' * (l.alnum + S('_-'))^1)
-
--- Mixins.
-local mixin = token('mixin', P('@') * l.word)
-
-local css = l.load('css')
-local _rules = css._rules
-table.insert(_rules, #_rules - 1, {'mixin', mixin})
-table.insert(_rules, #_rules - 1, {'line_comment', line_comment})
-table.insert(_rules, #_rules - 1, {'variable', variable})
-M._rules = _rules
-
-M._tokenstyles = css._tokenstyles
-M._tokenstyles['mixin'] = l.STYLE_FUNCTION
-
-M._foldsymbols = css._foldsymbols
-
-return M