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, 176 insertions, 0 deletions

diff --git a/lua/lexers/dmd.lua b/lua/lexers/dmd.lua
new file mode 100644
index 0000000..f73763a
--- /dev/null
+++ b/lua/lexers/dmd.lua
@@ -0,0 +1,176 @@
+-- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
+-- D LPeg lexer.
+-- Heavily modified 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 = 'dmd'}
+
+-- 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 nested_comment = l.nested_pair('/+', '+/')
+local comment = token(l.COMMENT, line_comment + block_comment + nested_comment)
+
+-- Strings.
+local sq_str = l.delimited_range("'", true) * S('cwd')^-1
+local dq_str = l.delimited_range('"') * S('cwd')^-1
+local lit_str = 'r' * l.delimited_range('"', false, true) * S('cwd')^-1
+local bt_str = l.delimited_range('`', false, true) * S('cwd')^-1
+local hex_str = 'x' * l.delimited_range('"') * S('cwd')^-1
+local other_hex_str = '\\x' * (l.xdigit * l.xdigit)^1
+local del_str = l.nested_pair('q"[', ']"') * S('cwd')^-1 +
+                l.nested_pair('q"(', ')"') * S('cwd')^-1 +
+                l.nested_pair('q"{', '}"') * S('cwd')^-1 +
+                l.nested_pair('q"<', '>"') * S('cwd')^-1 +
+                P('q') * l.nested_pair('{', '}') * S('cwd')^-1
+local string = token(l.STRING, del_str + sq_str + dq_str + lit_str + bt_str +
+                               hex_str + other_hex_str)
+
+-- Numbers.
+local dec = l.digit^1 * ('_' * l.digit^1)^0
+local hex_num = l.hex_num * ('_' * l.xdigit^1)^0
+local bin_num = '0' * S('bB') * S('01_')^1
+local oct_num = '0' * S('01234567_')^1
+local integer = S('+-')^-1 * (hex_num + oct_num + bin_num + dec)
+local number = token(l.NUMBER, (l.float + integer) * S('uUlLdDfFi')^-1)
+
+-- Keywords.
+local keyword = token(l.KEYWORD, word_match{
+  'abstract', 'align', 'asm', 'assert', 'auto', 'body', 'break', 'case', 'cast',
+  'catch', 'const', 'continue', 'debug', 'default', 'delete',
+  'deprecated', 'do', 'else', 'extern', 'export', 'false', 'final', 'finally',
+  'for', 'foreach', 'foreach_reverse', 'goto', 'if', 'import', 'immutable',
+  'in', 'inout', 'invariant', 'is', 'lazy', 'macro', 'mixin', 'new', 'nothrow',
+  'null', 'out', 'override', 'pragma', 'private', 'protected', 'public', 'pure',
+  'ref', 'return', 'scope', 'shared', 'static', 'super', 'switch',
+  'synchronized', 'this', 'throw','true', 'try', 'typeid', 'typeof', 'unittest',
+  'version', 'virtual', 'volatile', 'while', 'with', '__gshared', '__thread',
+  '__traits', '__vector', '__parameters'
+})
+
+-- Types.
+local type = token(l.TYPE, word_match{
+  'alias', 'bool', 'byte', 'cdouble', 'cent', 'cfloat', 'char', 'class',
+  'creal', 'dchar', 'delegate', 'double', 'enum', 'float', 'function',
+  'idouble', 'ifloat', 'int', 'interface', 'ireal', 'long', 'module', 'package',
+  'ptrdiff_t', 'real', 'short', 'size_t', 'struct', 'template', 'typedef',
+  'ubyte', 'ucent', 'uint', 'ulong', 'union', 'ushort', 'void', 'wchar',
+  'string', 'wstring', 'dstring', 'hash_t', 'equals_t'
+})
+
+-- Constants.
+local constant = token(l.CONSTANT, word_match{
+  '__FILE__', '__LINE__', '__DATE__', '__EOF__', '__TIME__', '__TIMESTAMP__',
+  '__VENDOR__', '__VERSION__', '__FUNCTION__', '__PRETTY_FUNCTION__',
+  '__MODULE__',
+})
+
+local class_sequence = token(l.TYPE, P('class') + P('struct')) * ws^1 *
+                                     token(l.CLASS, l.word)
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.word)
+
+-- Operators.
+local operator = token(l.OPERATOR, S('?=!<>+-*$/%&|^~.,;()[]{}'))
+
+-- Properties.
+local properties = (type + identifier + operator) * token(l.OPERATOR, '.') *
+  token(l.VARIABLE, word_match{
+    'alignof', 'dig', 'dup', 'epsilon', 'idup', 'im', 'init', 'infinity',
+    'keys', 'length', 'mangleof', 'mant_dig', 'max', 'max_10_exp', 'max_exp',
+    'min', 'min_normal', 'min_10_exp', 'min_exp', 'nan', 'offsetof', 'ptr',
+    're', 'rehash', 'reverse', 'sizeof', 'sort', 'stringof', 'tupleof',
+    'values'
+  })
+
+-- Preprocs.
+local annotation = token('annotation', '@' * l.word^1)
+local preproc = token(l.PREPROCESSOR, '#' * l.nonnewline^0)
+
+-- Traits.
+local traits_list = token('traits', word_match{
+  'allMembers', 'classInstanceSize', 'compiles', 'derivedMembers',
+  'getAttributes', 'getMember', 'getOverloads', 'getProtection', 'getUnitTests',
+  'getVirtualFunctions', 'getVirtualIndex', 'getVirtualMethods', 'hasMember',
+  'identifier', 'isAbstractClass', 'isAbstractFunction', 'isArithmetic',
+  'isAssociativeArray', 'isFinalClass', 'isFinalFunction', 'isFloating',
+  'isIntegral', 'isLazy', 'isNested', 'isOut', 'isOverrideFunction', 'isPOD',
+  'isRef', 'isSame', 'isScalar', 'isStaticArray', 'isStaticFunction',
+  'isUnsigned', 'isVirtualFunction', 'isVirtualMethod', 'parent'
+})
+
+local scopes_list = token('scopes', word_match{'exit', 'success', 'failure'})
+
+-- versions
+local versions_list = token('versions', word_match{
+  'AArch64', 'AIX', 'all', 'Alpha', 'Alpha_HardFloat', 'Alpha_SoftFloat',
+  'Android', 'ARM', 'ARM_HardFloat', 'ARM_SoftFloat', 'ARM_SoftFP', 'ARM_Thumb',
+  'assert', 'BigEndian', 'BSD', 'Cygwin', 'D_Coverage', 'D_Ddoc', 'D_HardFloat',
+  'DigitalMars', 'D_InlineAsm_X86', 'D_InlineAsm_X86_64', 'D_LP64',
+  'D_NoBoundsChecks', 'D_PIC', 'DragonFlyBSD', 'D_SIMD', 'D_SoftFloat',
+  'D_Version2', 'D_X32', 'FreeBSD', 'GNU', 'Haiku', 'HPPA', 'HPPA64', 'Hurd',
+  'IA64', 'LDC', 'linux', 'LittleEndian', 'MIPS32', 'MIPS64', 'MIPS_EABI',
+  'MIPS_HardFloat', 'MIPS_N32', 'MIPS_N64', 'MIPS_O32', 'MIPS_O64',
+  'MIPS_SoftFloat', 'NetBSD', 'none', 'OpenBSD', 'OSX', 'Posix', 'PPC', 'PPC64',
+  'PPC_HardFloat', 'PPC_SoftFloat', 'S390', 'S390X', 'SDC', 'SH', 'SH64',
+  'SkyOS', 'Solaris', 'SPARC', 'SPARC64', 'SPARC_HardFloat', 'SPARC_SoftFloat',
+  'SPARC_V8Plus', 'SysV3', 'SysV4', 'unittest', 'Win32', 'Win64', 'Windows',
+  'X86', 'X86_64'
+})
+
+local versions = token(l.KEYWORD, 'version') * l.space^0 *
+                 token(l.OPERATOR, '(') * l.space^0 * versions_list
+
+local scopes = token(l.KEYWORD, 'scope') * l.space^0 *
+               token(l.OPERATOR, '(') * l.space^0 * scopes_list
+
+local traits = token(l.KEYWORD, '__traits') * l.space^0 *
+               token(l.OPERATOR, '(') * l.space^0 * traits_list
+
+local func = token(l.FUNCTION, l.word) *
+             #(l.space^0 * (P('!') * l.word^-1 * l.space^-1)^-1 * P('('))
+
+M._rules = {
+  {'whitespace', ws},
+  {'class', class_sequence},
+  {'traits', traits},
+  {'versions', versions},
+  {'scopes', scopes},
+  {'keyword', keyword},
+  {'variable', properties},
+  {'type', type},
+  {'function', func},
+  {'constant', constant},
+  {'string', string},
+  {'identifier', identifier},
+  {'comment', comment},
+  {'number', number},
+  {'preproc', preproc},
+  {'operator', operator},
+  {'annotation', annotation},
+}
+
+M._tokenstyles = {
+  annotation = l.STYLE_PREPROCESSOR,
+  traits = l.STYLE_CLASS,
+  versions = l.STYLE_CONSTANT,
+  scopes = l.STYLE_CONSTANT
+}
+
+M._foldsymbols = {
+  _patterns = {'[{}]', '/[*+]', '[*+]/', '//'},
+  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
+  [l.COMMENT] = {
+    ['/*'] = 1, ['*/'] = -1, ['/+'] = 1, ['+/'] = -1,
+    ['//'] = l.fold_line_comments('//')
+  }
+}
+
+return M