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, 87 deletions

diff --git a/lexers/objective_c.lua b/lexers/objective_c.lua
deleted file mode 100644
index 4722c2c..0000000
--- a/lexers/objective_c.lua
+++ /dev/null
@@ -1,87 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Objective C 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 = 'objective_c'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '//' * l.nonnewline_esc^0
-local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
-local comment = token(l.COMMENT, line_comment + block_comment)
-
--- Strings.
-local sq_str = P('L')^-1 * l.delimited_range("'", true)
-local dq_str = P('L')^-1 * l.delimited_range('"', true)
-local string = token(l.STRING, sq_str + dq_str)
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Preprocessor.
-local preproc_word = word_match{
-  'define', 'elif', 'else', 'endif', 'error', 'if', 'ifdef',
-  'ifndef', 'import', 'include', 'line', 'pragma', 'undef',
-  'warning'
-}
-local preproc = token(l.PREPROCESSOR,
-                      l.starts_line('#') * S('\t ')^0 * preproc_word *
-                      (l.nonnewline_esc^1 + l.space * l.nonnewline_esc^0))
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match({
-  -- From C.
-  'asm', 'auto', 'break', 'case', 'const', 'continue', 'default', 'do', 'else',
-  'extern', 'false', 'for', 'goto', 'if', 'inline', 'register', 'return',
-  'sizeof', 'static', 'switch', 'true', 'typedef', 'void', 'volatile', 'while',
-  'restrict', '_Bool', '_Complex', '_Pragma', '_Imaginary',
-  -- Objective C.
-  'oneway', 'in', 'out', 'inout', 'bycopy', 'byref', 'self', 'super',
-  -- Preprocessor directives.
-  '@interface', '@implementation', '@protocol', '@end', '@private',
-  '@protected', '@public', '@class', '@selector', '@encode', '@defs',
-  '@synchronized', '@try', '@throw', '@catch', '@finally',
-  -- Constants.
-  'TRUE', 'FALSE', 'YES', 'NO', 'NULL', 'nil', 'Nil', 'METHOD_NULL'
-}, '@'))
-
--- Types.
-local type = token(l.TYPE, word_match{
-  'apply_t', 'id', 'Class', 'MetaClass', 'Object', 'Protocol', 'retval_t',
-  'SEL', 'STR', 'IMP', 'BOOL', 'TypedStream'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'type', type},
-  {'string', string},
-  {'identifier', identifier},
-  {'comment', comment},
-  {'number', number},
-  {'preproc', preproc},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'%l+', '[{}]', '/%*', '%*/', '//'},
-  [l.PREPROCESSOR] = {
-    region = 1, endregion = -1,
-    ['if'] = 1, ifdef = 1, ifndef = 1, endif = -1
-  },
-  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
-  [l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')}
-}
-
-return M