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, 66 deletions

diff --git a/lexers/io_lang.lua b/lexers/io_lang.lua
deleted file mode 100644
index 0d8b483..0000000
--- a/lexers/io_lang.lua
+++ /dev/null
@@ -1,66 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Io 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 = 'io_lang'}
-
--- 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, line_comment + block_comment)
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local tq_str = '"""' * (l.any - '"""')^0 * P('"""')^-1
-local string = token(l.STRING, tq_str + sq_str + dq_str)
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'block', 'method', 'while', 'foreach', 'if', 'else', 'do', 'super', 'self',
-  'clone', 'proto', 'setSlot', 'hasSlot', 'type', 'write', 'print', 'forward'
-})
-
--- Types.
-local type = token(l.TYPE, word_match{
-  'Block', 'Buffer', 'CFunction', 'Date', 'Duration', 'File', 'Future', 'List',
-  'LinkedList', 'Map', 'Nop', 'Message', 'Nil', 'Number', 'Object', 'String',
-  'WeakLink'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('`~@$%^&*-+/=\\<>?.,:;()[]{}'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'type', type},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'[%(%)]', '/%*', '%*/', '#', '//'},
-  [l.OPERATOR] = {['('] = 1, [')'] = -1},
-  [l.COMMENT] = {
-    ['/*'] = 1, ['*/'] = -1, ['#'] = l.fold_line_comments('#'),
-    ['//'] = l.fold_line_comments('//')
-  }
-}
-
-return M