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, 99 deletions

diff --git a/lexers/xml.lua b/lexers/xml.lua
deleted file mode 100644
index 2692b2a..0000000
--- a/lexers/xml.lua
+++ /dev/null
@@ -1,99 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- XML LPeg lexer.
-
-local l = require('lexer')
-local token, word_match = l.token, l.word_match
-local P, R, S, V = lpeg.P, lpeg.R, lpeg.S, lpeg.V
-
-local M = {_NAME = 'xml'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments and CDATA.
-local comment = token(l.COMMENT, '<!--' * (l.any - '-->')^0 * P('-->')^-1)
-local cdata = token('cdata', '<![CDATA[' * (l.any - ']]>')^0 * P(']]>')^-1)
-
--- Strings.
-local sq_str = l.delimited_range("'", false, true)
-local dq_str = l.delimited_range('"', false, true)
-local string = #S('\'"') * l.last_char_includes('=') *
-               token(l.STRING, sq_str + dq_str)
-
-local in_tag = P(function(input, index)
-  local before = input:sub(1, index - 1)
-  local s, e = before:find('<[^>]-$'), before:find('>[^<]-$')
-  if s and e then return s > e and index or nil end
-  if s then return index end
-  return input:find('^[^<]->', index) and index or nil
-end)
-
--- Numbers.
-local number = #l.digit * l.last_char_includes('=') *
-               token(l.NUMBER, l.digit^1 * P('%')^-1) * in_tag
-
-local alpha = R('az', 'AZ', '\127\255')
-local word_char = l.alnum + S('_-:.??')
-local identifier = (l.alpha + S('_-:.??')) * word_char^0
-local namespace = token(l.OPERATOR, ':') * token('namespace', identifier)
-
--- Elements.
-local element = token('element', '<' * P('/')^-1 * identifier) * namespace^-1
-
--- Attributes.
-local attribute = token('attribute', identifier) * namespace^-1 *
-                  #(l.space^0 * '=')
-
--- Closing tags.
-local close_tag = token('element', P('/')^-1 * '>')
-
--- Equals.
-local equals = token(l.OPERATOR, '=') * in_tag
-
--- Entities.
-local entity = token('entity', '&' * word_match{
-  'lt', 'gt', 'amp', 'apos', 'quot'
-} * ';')
-
--- Doctypes and other markup tags.
-local doctype = token('doctype', P('<!DOCTYPE')) * ws *
-                token('doctype', identifier) * (ws * identifier)^-1 *
-                (1 - P('>'))^0 * token('doctype', '>')
-
--- Processing instructions.
-local proc_insn = token('proc_insn', P('<?') * (1 - P('?>'))^0 * P('?>')^-1)
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'cdata', cdata},
-  {'doctype', doctype},
-  {'proc_insn', proc_insn},
-  {'element', element},
-  {'close_tag', close_tag},
-  {'attribute', attribute},
-  {'equals', equals},
-  {'string', string},
-  {'number', number},
-  {'entity', entity},
-}
-
-M._tokenstyles = {
-  element = l.STYLE_KEYWORD,
-  namespace = l.STYLE_CLASS,
-  attribute = l.STYLE_TYPE,
-  cdata = l.STYLE_COMMENT,
-  entity = l.STYLE_OPERATOR,
-  doctype = l.STYLE_COMMENT,
-  proc_insn = l.STYLE_COMMENT,
-  --markup = l.STYLE_COMMENT
-}
-
-M._foldsymbols = {
-  _patterns = {'</?', '/>', '<!%-%-', '%-%->', '<!%[CDATA%[', '%]%]>'},
-  element = {['<'] = 1, ['/>'] = -1, ['</'] = -1},
-  [l.COMMENT] = {['<!--'] = 1, ['-->'] = -1},
-  cdata = {['<![CDATA['] = 1, [']]>'] = -1}
-}
-
-return M