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, 71 deletions

diff --git a/lexers/dot.lua b/lexers/dot.lua
deleted file mode 100644
index 5ff845b..0000000
--- a/lexers/dot.lua
+++ /dev/null
@@ -1,71 +0,0 @@
--- Copyright 2006-2013 Brian "Sir Alaran" Schott. See LICENSE.
--- Dot LPeg lexer.
--- Based off of lexer code by Mitchell.
-
-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 = 'dot'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '//' * l.nonnewline_esc^0
-local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
-local comment = token(l.COMMENT, line_comment + block_comment)
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local string = token(l.STRING, sq_str + dq_str)
-
--- Numbers.
-local number = token(l.NUMBER, l.digit^1 + l.float)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'graph', 'node', 'edge', 'digraph', 'fontsize', 'rankdir',
-  'fontname', 'shape', 'label', 'arrowhead', 'arrowtail', 'arrowsize',
-  'color', 'comment', 'constraint', 'decorate', 'dir', 'headlabel', 'headport',
-  'headURL', 'labelangle', 'labeldistance', 'labelfloat', 'labelfontcolor',
-  'labelfontname', 'labelfontsize', 'layer', 'lhead', 'ltail', 'minlen',
-  'samehead', 'sametail', 'style', 'taillabel', 'tailport', 'tailURL', 'weight',
-  'subgraph'
-})
-
--- Types.
-local type = token(l.TYPE, word_match{
-	'box', 'polygon', 'ellipse', 'circle', 'point', 'egg', 'triangle',
-	'plaintext', 'diamond', 'trapezium', 'parallelogram', 'house', 'pentagon',
-	'hexagon', 'septagon', 'octagon', 'doublecircle', 'doubleoctagon',
-	'tripleoctagon', 'invtriangle', 'invtrapezium', 'invhouse', 'Mdiamond',
-	'Msquare', 'Mcircle', 'rect', 'rectangle', 'none', 'note', 'tab', 'folder',
-	'box3d', 'record'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('->()[]{};'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'keyword', keyword},
-  {'type', type},
-  {'identifier', identifier},
-  {'number', number},
-  {'string', string},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'[{}]', '/%*', '%*/', '//'},
-  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
-  [l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')}
-}
-
-return M