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, 62 deletions

diff --git a/lexers/smalltalk.lua b/lexers/smalltalk.lua
deleted file mode 100644
index 735ea47..0000000
--- a/lexers/smalltalk.lua
+++ /dev/null
@@ -1,62 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Smalltalk 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 = 'smalltalk'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, l.delimited_range('"', false, true))
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local literal = '$' * l.word
-local string = token(l.STRING, sq_str + literal)
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'true', 'false', 'nil', 'self', 'super', 'isNil', 'not', 'Smalltalk',
-  'Transcript'
-})
-
--- Types.
-local type = token(l.TYPE, word_match{
-  'Date', 'Time', 'Boolean', 'True', 'False', 'Character', 'String', 'Array',
-  'Symbol', 'Integer', 'Object'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S(':=_<>+-/*!()[]'))
-
--- Labels.
-local label = token(l.LABEL, '#' * l.word)
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'type', type},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'label', label},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'[%[%]]'},
-  [l.OPERATOR] = {['['] = 1, [']'] = -1}
-}
-
-return M