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, 148 deletions

diff --git a/lexers/ruby.lua b/lexers/ruby.lua
deleted file mode 100644
index d923917..0000000
--- a/lexers/ruby.lua
+++ /dev/null
@@ -1,148 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Ruby 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 = 'ruby'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '#' * l.nonnewline_esc^0
-local block_comment = l.starts_line('=begin') * (l.any - l.newline * '=end')^0 *
-                      (l.newline * '=end')^-1
-local comment = token(l.COMMENT, block_comment + line_comment)
-
-local delimiter_matches = {['('] = ')', ['['] = ']', ['{'] = '}'}
-local literal_delimitted = P(function(input, index)
-  local delimiter = input:sub(index, index)
-  if not delimiter:find('[%w\r\n\f\t ]') then -- only non alpha-numerics
-    local match_pos, patt
-    if delimiter_matches[delimiter] then
-      -- Handle nested delimiter/matches in strings.
-      local s, e = delimiter, delimiter_matches[delimiter]
-      patt = l.delimited_range(s..e, false, false, true)
-    else
-      patt = l.delimited_range(delimiter)
-    end
-    match_pos = lpeg.match(patt, input, index)
-    return match_pos or #input + 1
-  end
-end)
-
--- Strings.
-local cmd_str = l.delimited_range('`')
-local lit_cmd = '%x' * literal_delimitted
-local lit_array = '%w' * literal_delimitted
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local lit_str = '%' * S('qQ')^-1 * literal_delimitted
-local heredoc = '<<' * P(function(input, index)
-  local s, e, indented, _, delimiter =
-    input:find('(%-?)(["`]?)([%a_][%w_]*)%2[\n\r\f;]+', index)
-  if s == index and delimiter then
-    local end_heredoc = (#indented > 0 and '[\n\r\f]+ *' or '[\n\r\f]+')
-    local _, e = input:find(end_heredoc..delimiter, e)
-    return e and e + 1 or #input + 1
-  end
-end)
--- TODO: regex_str fails with `obj.method /patt/` syntax.
-local regex_str = #P('/') * l.last_char_includes('!%^&*([{-=+|:;,?<>~') *
-                  l.delimited_range('/', true, false) * S('iomx')^0
-local lit_regex = '%r' * literal_delimitted * S('iomx')^0
-local string = token(l.STRING, (sq_str + dq_str + lit_str + heredoc + cmd_str +
-                                lit_cmd + lit_array) * S('f')^-1) +
-               token(l.REGEX, regex_str + lit_regex)
-
-local word_char = l.alnum + S('_!?')
-
--- Numbers.
-local dec = l.digit^1 * ('_' * l.digit^1)^0 * S('ri')^-1
-local bin = '0b' * S('01')^1 * ('_' * S('01')^1)^0
-local integer = S('+-')^-1 * (bin + l.hex_num + l.oct_num + dec)
--- TODO: meta, control, etc. for numeric_literal.
-local numeric_literal = '?' * (l.any - l.space) * -word_char
-local number = token(l.NUMBER, l.float * S('ri')^-1 + integer + numeric_literal)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match({
-  'BEGIN', 'END', 'alias', 'and', 'begin', 'break', 'case', 'class', 'def',
-  'defined?', 'do', 'else', 'elsif', 'end', 'ensure', 'false', 'for', 'if',
-  'in', 'module', 'next', 'nil', 'not', 'or', 'redo', 'rescue', 'retry',
-  'return', 'self', 'super', 'then', 'true', 'undef', 'unless', 'until', 'when',
-  'while', 'yield', '__FILE__', '__LINE__'
-}, '?!'))
-
--- Functions.
-local func = token(l.FUNCTION, word_match({
-  'at_exit', 'autoload', 'binding', 'caller', 'catch', 'chop', 'chop!', 'chomp',
-  'chomp!', 'eval', 'exec', 'exit', 'exit!', 'fail', 'fork', 'format', 'gets',
-  'global_variables', 'gsub', 'gsub!', 'iterator?', 'lambda', 'load',
-  'local_variables', 'loop', 'open', 'p', 'print', 'printf', 'proc', 'putc',
-  'puts', 'raise', 'rand', 'readline', 'readlines', 'require', 'select',
-  'sleep', 'split', 'sprintf', 'srand', 'sub', 'sub!', 'syscall', 'system',
-  'test', 'trace_var', 'trap', 'untrace_var'
-}, '?!')) * -S('.:|')
-
--- Identifiers.
-local word = (l.alpha + '_') * word_char^0
-local identifier = token(l.IDENTIFIER, word)
-
--- Variables.
-local global_var = '$' * (word + S('!@L+`\'=~/\\,.;<>_*"$?:') + l.digit + '-' *
-                   S('0FadiIKlpvw'))
-local class_var = '@@' * word
-local inst_var = '@' * word
-local variable = token(l.VARIABLE, global_var + class_var + inst_var)
-
--- Symbols.
-local symbol = token('symbol', ':' * P(function(input, index)
-  if input:sub(index - 2, index - 2) ~= ':' then return index end
-end) * (word_char^1 + sq_str + dq_str))
-
--- Operators.
-local operator = token(l.OPERATOR, S('!%^&*()[]{}-=+/|:;.,?<>~'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'function', func},
-  {'identifier', identifier},
-  {'comment', comment},
-  {'string', string},
-  {'number', number},
-  {'variable', variable},
-  {'symbol', symbol},
-  {'operator', operator},
-}
-
-M._tokenstyles = {
-  symbol = l.STYLE_CONSTANT
-}
-
-local function disambiguate(text, pos, line, s)
-  return line:sub(1, s - 1):match('^%s*$') and
-         not text:sub(1, pos - 1):match('\\[ \t]*\r?\n$') and 1 or 0
-end
-
-M._foldsymbols = {
-  _patterns = {'%l+', '[%(%)%[%]{}]', '=begin', '=end', '#'},
-  [l.KEYWORD] = {
-    begin = 1, class = 1, def = 1, ['do'] = 1, ['for'] = 1, ['module'] = 1,
-    case = 1,
-    ['if'] = disambiguate, ['while'] = disambiguate,
-    ['unless'] = disambiguate, ['until'] = disambiguate,
-    ['end'] = -1
-  },
-  [l.OPERATOR] = {
-    ['('] = 1, [')'] = -1, ['['] = 1, [']'] = -1, ['{'] = 1, ['}'] = -1
-  },
-  [l.COMMENT] = {
-    ['=begin'] = 1, ['=end'] = -1, ['#'] = l.fold_line_comments('#')
-  }
-}
-
-return M