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, 61 deletions

diff --git a/lexers/ps.lua b/lexers/ps.lua
deleted file mode 100644
index c8a0ac4..0000000
--- a/lexers/ps.lua
+++ /dev/null
@@ -1,61 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Postscript 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 = 'ps'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, '%' * l.nonnewline^0)
-
--- Strings.
-local arrow_string = l.delimited_range('<>')
-local nested_string = l.delimited_range('()', false, false, true)
-local string = token(l.STRING, arrow_string + nested_string)
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'pop', 'exch', 'dup', 'copy', 'roll', 'clear', 'count', 'mark', 'cleartomark',
-  'counttomark', 'exec', 'if', 'ifelse', 'for', 'repeat', 'loop', 'exit',
-  'stop', 'stopped', 'countexecstack', 'execstack', 'quit', 'start',
-  'true', 'false', 'NULL'
-})
-
--- Functions.
-local func = token(l.FUNCTION, word_match{
-  'add', 'div', 'idiv', 'mod', 'mul', 'sub', 'abs', 'ned', 'ceiling', 'floor',
-  'round', 'truncate', 'sqrt', 'atan', 'cos', 'sin', 'exp', 'ln', 'log', 'rand',
-  'srand', 'rrand'
-})
-
--- Identifiers.
-local word = (l.alpha + '-') * (l.alnum + '-')^0
-local identifier = token(l.IDENTIFIER, word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('[]{}'))
-
--- Labels.
-local label = token(l.LABEL, '/' * word)
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'function', func},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'label', label},
-  {'operator', operator},
-}
-
-return M