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, 131 deletions

diff --git a/lexers/pkgbuild.lua b/lexers/pkgbuild.lua
deleted file mode 100644
index f08f114..0000000
--- a/lexers/pkgbuild.lua
+++ /dev/null
@@ -1,131 +0,0 @@
--- Copyright 2006-2013 gwash. See LICENSE.
--- Archlinux PKGBUILD 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 = 'pkgbuild'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, '#' * l.nonnewline^0)
-
--- Strings.
-local sq_str = l.delimited_range("'", false, true)
-local dq_str = l.delimited_range('"')
-local ex_str = l.delimited_range('`')
-local heredoc = '<<' * P(function(input, index)
-  local s, e, _, delimiter =
-    input:find('(["\']?)([%a_][%w_]*)%1[\n\r\f;]+', index)
-  if s == index and delimiter then
-    local _, e = input:find('[\n\r\f]+'..delimiter, e)
-    return e and e + 1 or #input + 1
-  end
-end)
-local string = token(l.STRING, sq_str + dq_str + ex_str + heredoc)
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match({
-  'patch', 'cd', 'make', 'patch', 'mkdir', 'cp', 'sed', 'install', 'rm',
-  'if', 'then', 'elif', 'else', 'fi', 'case', 'in', 'esac', 'while', 'for',
-  'do', 'done', 'continue', 'local', 'return', 'git', 'svn', 'co', 'clone',
-  'gconf-merge-schema', 'msg', 'echo', 'ln',
-  -- Operators.
-  '-a', '-b', '-c', '-d', '-e', '-f', '-g', '-h', '-k', '-p', '-r', '-s', '-t',
-  '-u', '-w', '-x', '-O', '-G', '-L', '-S', '-N', '-nt', '-ot', '-ef', '-o',
-  '-z', '-n', '-eq', '-ne', '-lt', '-le', '-gt', '-ge', '-Np', '-i'
-}, '-'))
-
--- Functions.
-local func = token(l.FUNCTION, word_match{
-  'build',
-  'check',
-  'package',
-  'pkgver',
-  'prepare'
-} * '()')
-
--- Constants.
-local constants = {
-  -- We do *not* list pkgver, srcdir and startdir here.
-  -- These are defined by makepkg but user should not alter them.
-  'arch',
-  'backup',
-  'changelog',
-  'epoch',
-  'groups',
-  'install',
-  'license',
-  'noextract',
-  'options',
-  'pkgbase',
-  'pkgdesc',
-  'pkgname',
-  'pkgrel',
-  'pkgver',
-  'url',
-  'validpgpkeys'
-}
-local arch_specific = {
-  'checkdepends',
-  'conflicts',
-  'depends',
-  'makedepends',
-  'md5sums',
-  'optdepends',
-  'provides',
-  'replaces',
-  'sha1sums',
-  'sha256sums',
-  'sha384sums',
-  'sha512sums',
-  'source'
-}
-for _, field in ipairs(arch_specific) do
-  for _,arch in ipairs({ '', 'i686', 'x86_64' }) do
-    table.insert(constants, field..(arch ~= '' and '_'..arch or ''))
-  end
-end
-local constant = token(l.CONSTANT, word_match(constants))
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Variables.
-local variable = token(l.VARIABLE,
-                       '$' * (S('!#?*@$') +
-                       l.delimited_range('()', true, true) +
-                       l.delimited_range('[]', true, true) +
-                       l.delimited_range('{}', true, true) +
-                       l.delimited_range('`', true, true) +
-                       l.digit^1 + l.word))
-
--- Operators.
-local operator = token(l.OPERATOR, S('=!<>+-/*^~.,:;?()[]{}'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'string', string},
-  {'number', number},
-  {'keyword', keyword},
-  {'function', func},
-  {'constant', constant},
-  {'identifier', identifier},
-  {'variable', variable},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'[%(%){}]', '#'},
-  [l.OPERATOR] = {['('] = 1, [')'] = -1, ['{'] = 1, ['}'] = -1},
-  [l.COMMENT] = {['#'] = l.fold_line_comments('#')}
-}
-
-return M