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, 52 deletions

diff --git a/lexers/ini.lua b/lexers/ini.lua
deleted file mode 100644
index e5df55a..0000000
--- a/lexers/ini.lua
+++ /dev/null
@@ -1,52 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Ini 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 = 'ini'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, l.starts_line(S(';#')) * l.nonnewline^0)
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local label = l.delimited_range('[]', true, true)
-local string = token(l.STRING, sq_str + dq_str + label)
-
--- Numbers.
-local dec = l.digit^1 * ('_' * l.digit^1)^0
-local oct_num = '0' * S('01234567_')^1
-local integer = S('+-')^-1 * (l.hex_num + oct_num + dec)
-local number = token(l.NUMBER, (l.float + integer))
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'true', 'false', 'on', 'off', 'yes', 'no'
-})
-
--- Identifiers.
-local word = (l.alpha + '_') * (l.alnum + S('_.'))^0
-local identifier = token(l.IDENTIFIER, word)
-
--- Operators.
-local operator = token(l.OPERATOR, '=')
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
-M._LEXBYLINE = true
-
-return M