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, 70 deletions

diff --git a/lexers/pike.lua b/lexers/pike.lua
deleted file mode 100644
index 9367ea2..0000000
--- a/lexers/pike.lua
+++ /dev/null
@@ -1,70 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Pike 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 = 'pike'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '//' * l.nonnewline_esc^0
-local nested_comment = l.nested_pair('/*', '*/')
-local comment = token(l.COMMENT, line_comment + nested_comment)
-
--- Strings.
-local sq_str = l.delimited_range("'", true)
-local dq_str = l.delimited_range('"', true)
-local lit_str = '#' * l.delimited_range('"')
-local string = token(l.STRING, sq_str + dq_str + lit_str)
-
--- Numbers.
-local number = token(l.NUMBER, (l.float + l.integer) * S('lLdDfF')^-1)
-
--- Preprocessors.
-local preproc = token(l.PREPROCESSOR, l.starts_line('#') * l.nonnewline^0)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'break', 'case', 'catch', 'continue', 'default', 'do', 'else', 'for',
-  'foreach', 'gauge', 'if', 'lambda', 'return', 'sscanf', 'switch', 'while',
-  'import', 'inherit',
-  -- Type modifiers.
-  'constant', 'extern', 'final', 'inline', 'local', 'nomask', 'optional',
-  'private', 'protected', 'public', 'static', 'variant'
-})
-
--- Types.
-local type = token(l.TYPE, word_match{
-  'array', 'class', 'float', 'function', 'int', 'mapping', 'mixed', 'multiset',
-  'object', 'program', 'string', 'void'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('<>=!+-/*%&|^~@`.,:;()[]{}'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'type', type},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'preproc', preproc},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'[{}]', '/%*', '%*/', '//'},
-  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
-  [l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')}
-}
-
-return M