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, 39 deletions

diff --git a/lexers/gettext.lua b/lexers/gettext.lua
deleted file mode 100644
index 8556d01..0000000
--- a/lexers/gettext.lua
+++ /dev/null
@@ -1,39 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Gettext 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 = 'gettext'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, '#' * S(': .~') * l.nonnewline^0)
-
--- Strings.
-local string = token(l.STRING, l.delimited_range('"', true))
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match({
-  'msgid', 'msgid_plural', 'msgstr', 'fuzzy', 'c-format', 'no-c-format'
-}, '-', true))
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Variables.
-local variable = token(l.VARIABLE, S('%$@') * l.word)
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'string', string},
-  {'keyword', keyword},
-  {'identifier', identifier},
-  {'variable', variable},
-}
-
-return M