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, 74 deletions

diff --git a/lexers/antlr.lua b/lexers/antlr.lua
deleted file mode 100644
index 91dbd60..0000000
--- a/lexers/antlr.lua
+++ /dev/null
@@ -1,74 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- ANTLR 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 = 'antlr'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '//' * l.nonnewline^0
-local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
-local comment = token(l.COMMENT, line_comment + block_comment)
-
--- Strings.
-local string = token(l.STRING, l.delimited_range("'", true))
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'abstract', 'break', 'case', 'catch', 'continue', 'default', 'do', 'else',
-  'extends', 'final', 'finally', 'for', 'if', 'implements', 'instanceof',
-  'native', 'new', 'private', 'protected', 'public', 'return', 'static',
-  'switch', 'synchronized', 'throw', 'throws', 'transient', 'try', 'volatile',
-  'while', 'package', 'import', 'header', 'options', 'tokens', 'strictfp',
-  'false', 'null', 'super', 'this', 'true'
-})
-
--- Types.
-local type = token(l.TYPE, word_match{
-  'boolean', 'byte', 'char', 'class', 'double', 'float', 'int', 'interface',
-  'long', 'short', 'void'
-})
-
--- Functions.
-local func = token(l.FUNCTION, 'assert')
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('$@:;|.=+*?~!^>-()[]{}'))
-
--- Actions.
-local action = #P('{') * operator * token('action', (1 - P('}'))^0) *
-               (#P('}') * operator)^-1
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'type', type},
-  {'function', func},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'action', action},
-  {'operator', operator},
-}
-
-M._tokenstyles = {
-  action = l.STYLE_NOTHING
-}
-
-M._foldsymbols = {
-  _patterns = {'[:;%(%){}]', '/%*', '%*/', '//'},
-  [l.OPERATOR] = {
-    [':'] = 1, [';'] = -1, ['('] = 1, [')'] = -1, ['{'] = 1, ['}'] = -1
-  },
-  [l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')}
-}
-
-return M