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, 108 deletions

diff --git a/lexers/wsf.lua b/lexers/wsf.lua
deleted file mode 100644
index 21da83c..0000000
--- a/lexers/wsf.lua
+++ /dev/null
@@ -1,108 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- WSF LPeg lexer (based on XML).
--- Contributed by Jeff Stone.
-
-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 = 'wsf'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, '<!--' * (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
-
--- Elements.
-local element = token('element', '<' * P('/')^-1 * identifier)
-
--- Attributes.
-local attribute = token('attribute', identifier) * #(l.space^0 * '=')
-
--- Closing tags.
-local tag_close = token('element', P('/')^-1 * '>')
-
--- Equals.
-local equals = token(l.OPERATOR, '=') * in_tag
-
--- Entities.
-local entity = token('entity', '&' * word_match{
-  'lt', 'gt', 'amp', 'apos', 'quot'
-} * ';')
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'element', element},
-  {'tag_close', tag_close},
-  {'attribute', attribute},
-  {'equals', equals},
-  {'string', string},
-  {'number', number},
-  {'entity', entity}
-}
-
-M._tokenstyles = {
-  element = l.STYLE_KEYWORD,
-  attribute = l.STYLE_TYPE,
-  entity = l.STYLE_OPERATOR
-}
-
-M._foldsymbols = {
-  _patterns = {'</?', '/>', '<!%-%-', '%-%->'},
-  element = {['<'] = 1, ['/>'] = -1, ['</'] = -1},
-  [l.COMMENT] = {['<!--'] = 1, ['-->'] = -1},
-}
-
--- Finally, add JavaScript and VBScript as embedded languages
-
--- Tags that start embedded languages.
-M.embed_start_tag = element *
-                    (ws^1 * attribute * ws^0 * equals * ws^0 * string)^0 *
-                    ws^0 * tag_close
-M.embed_end_tag = element * tag_close
-
--- Embedded JavaScript.
-local js = l.load('javascript')
-local js_start_rule = #(P('<script') * (P(function(input, index)
-  if input:find('^%s+language%s*=%s*(["\'])[jJ][ava]*[sS]cript%1', index) then
-    return index
-  end
-end) + '>')) * M.embed_start_tag -- <script language="javascript">
-local js_end_rule = #('</script' * ws^0 * '>') * M.embed_end_tag -- </script>
-l.embed_lexer(M, js, js_start_rule, js_end_rule)
-
--- Embedded VBScript.
-local vbs = l.load('vbscript')
-local vbs_start_rule = #(P('<script') * (P(function(input, index)
-  if input:find('^%s+language%s*=%s*(["\'])[vV][bB][sS]cript%1', index) then
-    return index
-  end
-end) + '>')) * M.embed_start_tag -- <script language="vbscript">
-local vbs_end_rule = #('</script' * ws^0 * '>') * M.embed_end_tag -- </script>
-l.embed_lexer(M, vbs, vbs_start_rule, vbs_end_rule)
-
-return M