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, 141 deletions

diff --git a/lexers/crystal.lua b/lexers/crystal.lua
deleted file mode 100644
index 8766e96..0000000
--- a/lexers/crystal.lua
+++ /dev/null
@@ -1,141 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Copyright 2016 Michel Martens.
--- Crystal LPeg lexer (based on Ruby).
-
-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 = 'crystal'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '#' * l.nonnewline_esc^0
-local comment = token(l.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 sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-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 string = token(l.STRING, (sq_str + dq_str + heredoc + cmd_str) *
-                               S('f')^-1) +
-               token(l.REGEX, regex_str)
-
-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({
-  'alias', 'begin', 'break', 'case', 'class', 'def', 'defined?', 'do', 'else',
-  'elsif', 'end', 'ensure', 'false', 'for', 'if', 'in', 'module', 'next', 'nil',
-  'not', 'redo', 'rescue', 'retry', 'return', 'self', 'super', 'then', 'true',
-  'undef', 'unless', 'until', 'when', 'while', 'yield', '__FILE__', '__LINE__'
-}, '?!'))
-
--- Functions.
-local func = token(l.FUNCTION, word_match({
-  'abort', 'at_exit', 'caller', 'delay', 'exit', 'fork', 'future',
-  'get_stack_top', 'gets', 'lazy', 'loop', 'main', 'p', 'print', 'printf',
-  'puts', 'raise', 'rand', 'read_line', 'require', 'sleep', 'spawn', 'sprintf',
-  'system', 'with_color',
-  -- Macros
-  'assert_responds_to', 'debugger', 'parallel', 'pp', 'record', 'redefine_main'
-}, '?!')) * -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+', '[%(%)%[%]{}]', '#'},
-  [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] = {
-    ['#'] = l.fold_line_comments('#')
-  }
-}
-
-return M