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, 166 deletions

diff --git a/lexers/html.lua b/lexers/html.lua
deleted file mode 100644
index 3a3b78c..0000000
--- a/lexers/html.lua
+++ /dev/null
@@ -1,166 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- HTML 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 = 'html'}
-
-case_insensitive_tags = true
-
--- 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("'")
-local dq_str = l.delimited_range('"')
-local string = #S('\'"') * l.last_char_includes('=') *
-               token(l.STRING, sq_str + dq_str)
-
--- TODO: performance is terrible on large files.
-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
-
--- Elements.
-local known_element = token('element', '<' * P('/')^-1 * word_match({
-  'a', 'abbr', 'address', 'area', 'article', 'aside', 'audio', 'b', 'base',
-  'bdi', 'bdo', 'blockquote', 'body', 'br', 'button', 'canvas', 'caption',
-  'cite', 'code', 'col', 'colgroup', 'content', 'data', 'datalist', 'dd',
-  'decorator', 'del', 'details', 'dfn', 'div', 'dl', 'dt', 'element', 'em',
-  'embed', 'fieldset', 'figcaption', 'figure', 'footer', 'form', 'h1', 'h2',
-  'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hr', 'html', 'i', 'iframe', 'img',
-  'input', 'ins', 'kbd', 'keygen', 'label', 'legend', 'li', 'link', 'main',
-  'map', 'mark', 'menu', 'menuitem', 'meta', 'meter', 'nav', 'noscript',
-  'object', 'ol', 'optgroup', 'option', 'output', 'p', 'param', 'pre',
-  'progress', 'q', 'rp', 'rt', 'ruby', 's', 'samp', 'script', 'section',
-  'select', 'shadow', 'small', 'source', 'spacer', 'spacer', 'span', 'strong',
-  'style', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'template',
-  'textarea', 'tfoot', 'th', 'thead', 'time', 'title', 'tr', 'track', 'u', 'ul',
-  'var', 'video', 'wbr'
-}, nil, case_insensitive_tags))
-local unknown_element = token('unknown_element', '<' * P('/')^-1 * l.word)
-local element = known_element + unknown_element
-
--- Attributes.
-local known_attribute = token('attribute', word_match({
-  'accept', 'accept-charset', 'accesskey', 'action', 'align', 'alt', 'async',
-  'autocomplete', 'autofocus', 'autoplay', 'bgcolor', 'border', 'buffered',
-  'challenge', 'charset', 'checked', 'cite', 'class', 'code', 'codebase',
-  'color', 'cols', 'colspan', 'content', 'contenteditable', 'contextmenu',
-  'controls', 'coords', 'data', 'data-', 'datetime', 'default', 'defer', 'dir',
-  'dirname', 'disabled', 'download', 'draggable', 'dropzone', 'enctype', 'for',
-  'form', 'headers', 'height', 'hidden', 'high', 'href', 'hreflang',
-  'http-equiv', 'icon', 'id', 'ismap', 'itemprop', 'keytype', 'kind', 'label',
-  'lang', 'language', 'list', 'loop', 'low', 'manifest', 'max', 'maxlength',
-  'media', 'method', 'min', 'multiple', 'name', 'novalidate', 'open', 'optimum',
-  'pattern', 'ping', 'placeholder', 'poster', 'preload', 'pubdate',
-  'radiogroup', 'readonly', 'rel', 'required', 'reversed', 'role', 'rows',
-  'rowspan', 'sandbox', 'spellcheck', 'scope', 'scoped', 'seamless', 'selected',
-  'shape',   'size', 'sizes', 'span', 'src', 'srcdoc', 'srclang', 'start',
-  'step', 'style', 'summary', 'tabindex', 'target', 'title', 'type', 'usemap',
-  'value', 'width', 'wrap'
-}, '-', case_insensitive_tags) + ((P('data-') + 'aria-') * (l.alnum + '-')^1))
-local unknown_attribute = token('unknown_attribute', l.word)
-local attribute = (known_attribute + unknown_attribute) * #(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', '&' * (l.any - l.space - ';')^1 * ';')
-
--- Doctype.
-local doctype = token('doctype', '<!' *
-                      word_match({'doctype'}, nil, case_insensitive_tags) *
-                      (l.any - '>')^1 * '>')
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'doctype', doctype},
-  {'element', element},
-  {'tag_close', tag_close},
-  {'attribute', attribute},
---  {'equals', equals},
-  {'string', string},
-  {'number', number},
-  {'entity', entity},
-}
-
-M._tokenstyles = {
-  element = l.STYLE_KEYWORD,
-  unknown_element = l.STYLE_KEYWORD..',italics',
-  attribute = l.STYLE_TYPE,
-  unknown_attribute = l.STYLE_TYPE..',italics',
-  entity = l.STYLE_OPERATOR,
-  doctype = l.STYLE_COMMENT
-}
-
--- 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 CSS.
-local css = l.load('css')
-local style_element = word_match({'style'}, nil, case_insensitive_tags)
-local css_start_rule = #(P('<') * style_element *
-                        ('>' + P(function(input, index)
-  if input:find('^%s+type%s*=%s*(["\'])text/css%1', index) then
-    return index
-  end
-end))) * M.embed_start_tag -- <style type="text/css">
-local css_end_rule = #('</' * style_element * ws^0 * '>') *
-                     M.embed_end_tag -- </style>
-l.embed_lexer(M, css, css_start_rule, css_end_rule)
-
--- Embedded JavaScript.
-local js = l.load('javascript')
-local script_element = word_match({'script'}, nil, case_insensitive_tags)
-local js_start_rule = #(P('<') * script_element *
-                       ('>' + P(function(input, index)
-  if input:find('^%s+type%s*=%s*(["\'])text/javascript%1', index) then
-    return index
-  end
-end))) * M.embed_start_tag -- <script type="text/javascript">
-local js_end_rule = #('</' * script_element * ws^0 * '>') *
-                    M.embed_end_tag -- </script>
-l.embed_lexer(M, js, js_start_rule, js_end_rule)
-
--- Embedded CoffeeScript.
-local cs = l.load('coffeescript')
-local script_element = word_match({'script'}, nil, case_insensitive_tags)
-local cs_start_rule = #(P('<') * script_element * P(function(input, index)
-  if input:find('^[^>]+type%s*=%s*(["\'])text/coffeescript%1', index) then
-    return index
-  end
-end)) * M.embed_start_tag -- <script type="text/coffeescript">
-local cs_end_rule = #('</' * script_element * ws^0 * '>') *
-                    M.embed_end_tag -- </script>
-l.embed_lexer(M, cs, cs_start_rule, cs_end_rule)
-
-M._foldsymbols = {
-  _patterns = {'</?', '/>', '<!%-%-', '%-%->'},
-  element = {['<'] = 1, ['/>'] = -1, ['</'] = -1},
-  unknown_element = {['<'] = 1, ['/>'] = -1, ['</'] = -1},
-  [l.COMMENT] = {['<!--'] = 1, ['-->'] = -1}
-}
-
-return M