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, 64 deletions

diff --git a/lexers/javascript.lua b/lexers/javascript.lua
deleted file mode 100644
index f879948..0000000
--- a/lexers/javascript.lua
+++ /dev/null
@@ -1,64 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- JavaScript 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 = 'javascript'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '//' * l.nonnewline_esc^0
-local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
-local comment = token(l.COMMENT, line_comment + block_comment)
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local template_str = l.delimited_range('`')
-local regex_str = #P('/') * l.last_char_includes('+-*%^!=&|?:;,([{<>') *
-                  l.delimited_range('/', true) * S('igm')^0
-local string = token(l.STRING, sq_str + dq_str + template_str) +
-               token(l.REGEX, regex_str)
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'abstract', 'boolean', 'break', 'byte', 'case', 'catch', 'char', 'class',
-  'const', 'continue', 'debugger', 'default', 'delete', 'do', 'double', 'else',
-  'enum', 'export', 'extends', 'false', 'final', 'finally', 'float', 'for',
-  'function', 'goto', 'if', 'implements', 'import', 'in', 'instanceof', 'int',
-  'interface', 'let', 'long', 'native', 'new', 'null', 'of', 'package',
-  'private', 'protected', 'public', 'return', 'short', 'static', 'super',
-  'switch', 'synchronized', 'this', 'throw', 'throws', 'transient', 'true',
-  'try', 'typeof', 'var', 'void', 'volatile', 'while', 'with', 'yield'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('+-/*%^!=&|?:;,.()[]{}<>'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'identifier', identifier},
-  {'comment', comment},
-  {'number', number},
-  {'string', string},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'[{}]', '/%*', '%*/', '//'},
-  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
-  [l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')}
-}
-
-return M