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, 73 deletions

diff --git a/lexers/latex.lua b/lexers/latex.lua
deleted file mode 100644
index f1febe9..0000000
--- a/lexers/latex.lua
+++ /dev/null
@@ -1,73 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Latex LPeg lexer.
--- Modified by Brian Schott.
--- Modified by Robert Gieseke.
-
-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 = 'latex'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '%' * l.nonnewline^0
-local block_comment = '\\begin' * P(' ')^0 * '{comment}' *
-                      (l.any - '\\end' * P(' ')^0 * '{comment}')^0 *
-                      P('\\end' * P(' ')^0 * '{comment}')^-1
--- Note: need block_comment before line_comment or LPeg cannot compile rule.
-local comment = token(l.COMMENT, block_comment + line_comment)
-
--- Sections.
-local section = token('section', '\\' * word_match{
-  'part', 'chapter', 'section', 'subsection', 'subsubsection', 'paragraph',
-  'subparagraph'
-} * P('*')^-1)
-
--- Math environments.
-local math_word = word_match{
-  'align', 'displaymath', 'eqnarray', 'equation', 'gather', 'math', 'multline'
-}
-local math_begin_end = (P('begin') + P('end')) * P(' ')^0 *
-                       '{' * math_word * P('*')^-1 * '}'
-local math = token('math', '$' + '\\' * (S('[]()') + math_begin_end))
-
--- LaTeX environments.
-local environment = token('environment', '\\' * (P('begin') + P('end')) *
-                                         P(' ')^0 *
-                                         '{' * l.word * P('*')^-1 * '}')
-
--- Commands.
-local command = token(l.KEYWORD, '\\' * (l.alpha^1 + S('#$&~_^%{}')))
-
--- Operators.
-local operator = token(l.OPERATOR, S('&#{}[]'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'math', math},
-  {'environment', environment},
-  {'section', section},
-  {'keyword', command},
-  {'operator', operator},
-}
-
-M._tokenstyles = {
-  environment = l.STYLE_KEYWORD,
-  math = l.STYLE_FUNCTION,
-  section = l.STYLE_CLASS
-}
-
-M._foldsymbols = {
-  _patterns = {'\\[a-z]+', '[{}]', '%%'},
-  [l.COMMENT] = {
-    ['\\begin'] = 1, ['\\end'] = -1, ['%'] = l.fold_line_comments('%')
-  },
-  ['environment'] = {['\\begin'] = 1, ['\\end'] = -1},
-  [l.OPERATOR] = {['{'] = 1, ['}'] = -1}
-}
-
-return M