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, 71 insertions, 0 deletions

diff --git a/lua/lexers/gtkrc.lua b/lua/lexers/gtkrc.lua
new file mode 100644
index 0000000..02e4d45
--- /dev/null
+++ b/lua/lexers/gtkrc.lua
@@ -0,0 +1,71 @@
+-- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
+-- Gtkrc 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 = 'gtkrc'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local comment = token(l.COMMENT, '#' * l.nonnewline^0)
+
+-- Strings.
+local sq_str = l.delimited_range("'", true)
+local dq_str = l.delimited_range('"', true)
+local string = token(l.STRING, sq_str + dq_str)
+
+-- Numbers.
+local number = token(l.NUMBER, l.digit^1 * ('.' * l.digit^1)^-1)
+
+-- Keywords.
+local keyword = token(l.KEYWORD, word_match{
+  'binding', 'class', 'include', 'module_path', 'pixmap_path', 'im_module_file',
+  'style', 'widget', 'widget_class'
+})
+
+-- Variables.
+local variable = token(l.VARIABLE, word_match{
+  'bg', 'fg', 'base', 'text', 'xthickness', 'ythickness', 'bg_pixmap', 'font',
+  'fontset', 'font_name', 'stock', 'color', 'engine'
+})
+
+-- States.
+local state = token(l.CONSTANT, word_match{
+  'ACTIVE', 'SELECTED', 'NORMAL', 'PRELIGHT', 'INSENSITIVE', 'TRUE', 'FALSE'
+})
+
+-- Functions.
+local func = token(l.FUNCTION, word_match{
+  'mix', 'shade', 'lighter', 'darker'
+})
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.alpha * (l.alnum + S('_-'))^0)
+
+-- Operators.
+local operator = token(l.OPERATOR, S(':=,*()[]{}'))
+
+M._rules = {
+  {'whitespace', ws},
+  {'keyword', keyword},
+  {'variable', variable},
+  {'state', state},
+  {'function', func},
+  {'identifier', identifier},
+  {'string', string},
+  {'comment', comment},
+  {'number', number},
+  {'operator', operator},
+}
+
+M._foldsymbols = {
+  _patterns = {'[{}]', '#'},
+  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
+  [l.COMMENT] = {['#'] = l.fold_line_comments('#')}
+}
+
+return M