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, 53 deletions

diff --git a/lexers/pico8.lua b/lexers/pico8.lua
deleted file mode 100644
index 44364f3..0000000
--- a/lexers/pico8.lua
+++ /dev/null
@@ -1,53 +0,0 @@
--- Copyright 2016 Alejandro Baez (https://keybase.io/baez). See LICENSE.
--- PICO-8 Lexer.
--- http://www.lexaloffle.com/pico-8.php
-
-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 = 'pico8'}
-
--- Whitespace
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments
-local comment = token(l.COMMENT, '//' * l.nonnewline_esc^0)
-
--- Numbers
-local number = token(l.NUMBER, l.integer)
-
--- Keywords
-local keyword = token(l.KEYWORD, word_match{
-  '__lua__', '__gfx__', '__gff__', '__map__', '__sfx__', '__music__'
-})
-
--- Identifiers
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators
-local operator = token(l.OPERATOR, S('_'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'identifier', identifier},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
--- Embed Lua into PICO-8.
-local lua = l.load('lua')
-
-local lua_start_rule = token('pico8_tag', '__lua__')
-local lua_end_rule = token('pico8_tag', '__gfx__' )
-l.embed_lexer(M, lua, lua_start_rule, lua_end_rule)
-
-M._tokenstyles = {
-  pico8_tag = l.STYLE_EMBEDDED
-}
-
-M._foldsymbols = lua._foldsymbols
-
-return M