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, 77 deletions

diff --git a/lexers/dart.lua b/lexers/dart.lua
deleted file mode 100644
index c237128..0000000
--- a/lexers/dart.lua
+++ /dev/null
@@ -1,77 +0,0 @@
--- Dart LPeg lexer.
--- Written by Brian Schott (@Hackerpilot on Github).
-
-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 = 'dart'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = '//' * l.nonnewline_esc^0
-local nested_comment = l.nested_pair('/*', '*/')
-local comment = token(l.COMMENT, line_comment + nested_comment)
-
--- Strings.
-local sq_str = S('r')^-1 * l.delimited_range("'", true)
-local dq_str = S('r')^-1 * l.delimited_range('"', true)
-local sq_str_multiline = S('r')^-1 * l.delimited_range('"""')
-local dq_str_multiline = S('r')^-1 * l.delimited_range("''' ")
-local string = token(l.STRING,
-                     sq_str + dq_str + sq_str_multiline + dq_str_multiline)
-
--- Numbers.
-local number = token(l.NUMBER, (l.float + l.hex_num))
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'assert', 'break', 'case', 'catch', 'class', 'const', 'continue', 'default',
-  'do', 'else', 'enum', 'extends', 'false', 'final' , 'finally', 'for', 'if',
-  'in', 'is', 'new', 'null', 'rethrow', 'return', 'super', 'switch', 'this',
-  'throw', 'true', 'try', 'var', 'void', 'while', 'with',
-})
-
-local builtin_identifiers = token(l.CONSTANT, word_match{
-  'abstract', 'as', 'dynamic', 'export', 'external', 'factory', 'get',
-  'implements', 'import', 'library', 'operator', 'part', 'set', 'static',
-  'typedef'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('#?=!<>+-*$/%&|^~.,;()[]{}'))
-
--- Preprocs.
-local annotation = token('annotation', '@' * l.word^1)
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'constant', builtin_identifiers},
-  {'string', string},
-  {'identifier', identifier},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-  {'annotation', annotation},
-}
-
-M._tokenstyles = {
-  annotation = l.STYLE_PREPROCESSOR,
-}
-
-M._foldsymbols = {
-  _patterns = {'[{}]', '/[*+]', '[*+]/', '//'},
-  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
-  [l.COMMENT] = {
-    ['/*'] = 1, ['*/'] = -1, ['/+'] = 1, ['+/'] = -1,
-    ['//'] = l.fold_line_comments('//')
-  }
-}
-
-return M