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, 99 deletions

diff --git a/lexers/php.lua b/lexers/php.lua
deleted file mode 100644
index 22eb960..0000000
--- a/lexers/php.lua
+++ /dev/null
@@ -1,99 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- PHP LPeg lexer.
-
-local l = require('lexer')
-local token, word_match = l.token, l.word_match
-local P, R, S, V = lpeg.P, lpeg.R, lpeg.S, lpeg.V
-
-local M = {_NAME = 'php'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = (P('//') + '#') * l.nonnewline^0
-local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
-local comment = token(l.COMMENT, block_comment + line_comment)
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local bt_str = l.delimited_range('`')
-local heredoc = '<<<' * P(function(input, index)
-  local _, e, delimiter = input:find('([%a_][%w_]*)[\n\r\f]+', index)
-  if delimiter then
-    local _, e = input:find('[\n\r\f]+'..delimiter, e)
-    return e and e + 1
-  end
-end)
-local string = token(l.STRING, sq_str + dq_str + bt_str + heredoc)
--- TODO: interpolated code.
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'and', 'array', 'as', 'bool', 'boolean', 'break', 'case',
-  'cfunction', 'class', 'const', 'continue', 'declare', 'default',
-  'die', 'directory', 'do', 'double', 'echo', 'else', 'elseif',
-  'empty', 'enddeclare', 'endfor', 'endforeach', 'endif',
-  'endswitch', 'endwhile', 'eval', 'exit', 'extends', 'false',
-  'float', 'for', 'foreach', 'function', 'global', 'if', 'include',
-  'include_once', 'int', 'integer', 'isset', 'list', 'new', 'null',
-  'object', 'old_function', 'or', 'parent', 'print', 'real',
-  'require', 'require_once', 'resource', 'return', 'static',
-  'stdclass', 'string', 'switch', 'true', 'unset', 'use', 'var',
-  'while', 'xor', '__class__', '__file__', '__function__',
-  '__line__', '__sleep', '__wakeup'
-})
-
--- Variables.
-local word = (l.alpha + '_' + R('\127\255')) * (l.alnum + '_' + R('\127\255'))^0
-local variable = token(l.VARIABLE, '$' * word)
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('!@%^*&()-+=|/.,;:<>[]{}') + '?' * -P('>'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'identifier', identifier},
-  {'string', string},
-  {'variable', variable},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
--- Embedded in HTML.
-local html = l.load('html')
-
--- Embedded PHP.
-local php_start_rule = token('php_tag', '<?' * ('php' * l.space)^-1)
-local php_end_rule = token('php_tag', '?>')
-l.embed_lexer(html, M, php_start_rule, php_end_rule)
-
-M._tokenstyles = {
-  php_tag = l.STYLE_EMBEDDED
-}
-
-local _foldsymbols = html._foldsymbols
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '<%?'
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '%?>'
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '/%*'
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '%*/'
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '//'
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '#'
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '[{}()]'
-_foldsymbols.php_tag = {['<?'] = 1, ['?>'] = -1}
-_foldsymbols[l.COMMENT]['/*'], _foldsymbols[l.COMMENT]['*/'] = 1, -1
-_foldsymbols[l.COMMENT]['//'] = l.fold_line_comments('//')
-_foldsymbols[l.COMMENT]['#'] = l.fold_line_comments('#')
-_foldsymbols[l.OPERATOR] = {['{'] = 1, ['}'] = -1, ['('] = 1, [')'] = -1}
-M._foldsymbols = _foldsymbols
-
-return M