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, 58 deletions

diff --git a/lexers/faust.lua b/lexers/faust.lua
deleted file mode 100644
index 34c925e..0000000
--- a/lexers/faust.lua
+++ /dev/null
@@ -1,58 +0,0 @@
--- Copyright 2015-2016 David B. Lamkins <david@lamkins.net>. See LICENSE.
--- Faust LPeg lexer, see http://faust.grame.fr/
-
-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 = 'faust'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '//' * l.nonnewline^0
-local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
-local comment = token(l.COMMENT, line_comment + block_comment)
-
--- Strings.
-local string = token(l.STRING, l.delimited_range('"', true))
-
--- Numbers.
-local int = R('09')^1
-local rad = P('.')
-local exp = (P('e') * S('+-')^-1 * int)^-1
-local flt = int * (rad * int)^-1 * exp + int^-1 * rad * int * exp
-local number = token(l.NUMBER, flt + int)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'declare', 'import', 'mdoctags', 'dependencies', 'distributed', 'inputs',
-  'outputs', 'par', 'seq', 'sum', 'prod', 'xor', 'with', 'environment',
-  'library', 'component', 'ffunction', 'fvariable', 'fconstant', 'int', 'float',
-  'case', 'waveform', 'h:', 'v:', 't:'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local punct = S('+-/*%<>~!=^&|?~:;,.()[]{}@#$`\\\'')
-local operator = token(l.OPERATOR, punct)
-
--- Pragmas.
-local mdoc = P('<mdoc>') * (l.any - P('</mdoc>'))^0 * P('</mdoc>')
-local pragma = token(l.PREPROCESSOR, mdoc)
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'pragma', pragma},
-  {'keyword', keyword},
-  {'number', number},
-  {'operator', operator},
-  {'identifier', identifier},
-  {'string', string},
-}
-
-return M