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, 47 deletions

diff --git a/lexers/json.lua b/lexers/json.lua
deleted file mode 100644
index 6dcebec..0000000
--- a/lexers/json.lua
+++ /dev/null
@@ -1,47 +0,0 @@
--- Copyright 2006-2013 Brian "Sir Alaran" Schott. See LICENSE.
--- JSON LPeg lexer.
--- Based off of lexer code by Mitchell.
-
-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 = 'json'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, '/*' * (l.any - '*/')^0 * P('*/')^-1)
-
--- Strings.
-local sq_str = P('u')^-1 * l.delimited_range("'", true)
-local dq_str = P('U')^-1 * l.delimited_range('"', true)
-local string = token(l.STRING, sq_str + dq_str)
-
--- Numbers.
-local integer = S('+-')^-1 * l.digit^1 * S('Ll')^-1
-local number = token(l.NUMBER, l.float + integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{"true", "false", "null"})
-
--- Operators.
-local operator = token(l.OPERATOR, S('[]{}:,'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'string', string},
-  {'number', number},
-  {'keyword', keyword},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'[%[%]{}]', '/%*', '%*/'},
-  [l.OPERATOR] = {['['] = 1, [']'] = -1, ['{'] = 1, ['}'] = -1},
-  [l.COMMENT] = {['/*'] = 1, ['*/'] = -1}
-}
-
-return M