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, 182 insertions, 0 deletions

diff --git a/lua/lexers/nsis.lua b/lua/lexers/nsis.lua
new file mode 100644
index 0000000..184858a
--- /dev/null
+++ b/lua/lexers/nsis.lua
@@ -0,0 +1,182 @@
+-- Copyright 2006-2013 Robert Gieseke. See LICENSE.
+-- NSIS LPeg lexer
+-- Based on NSIS 2.46 docs: http://nsis.sourceforge.net/Docs/.
+
+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 = 'nsis'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments (4.1).
+local line_comment = (';' * l.nonnewline^0) + ('#' * l.nonnewline^0)
+local block_comment = '/*' * (l.any - '*/')^0 * '*/'
+local comment = token(l.COMMENT, line_comment + block_comment)
+
+-- Strings.
+local sq_str = l.delimited_range("'")
+local dq_str = l.delimited_range('"')
+local ex_str = l.delimited_range('`')
+local string = token(l.STRING, sq_str + dq_str + ex_str)
+
+-- Numbers.
+local number = token(l.NUMBER, l.integer)
+
+-- Variables (4.2).
+local variable = token(l.VARIABLE, word_match({
+  '$0', '$1', '$2', '$3', '$4', '$5', '$6', '$7', '$8', '$9',
+  '$R0', '$R1', '$R2', '$R3', '$R4', '$R5', '$R6', '$R7', '$R8', '$R9',
+  '$INSTDIR', '$OUTDIR', '$CMDLINE', '$LANGUAGE',
+  'Var', '/GLOBAL'
+}, '$/') + ('$' * l.word))
+
+-- Constants (4.2.3).
+local constant = token(l.CONSTANT, word_match({
+  '$PROGRAMFILES', '$PROGRAMFILES32', '$PROGRAMFILES64',
+  '$COMMONFILES', '$COMMONFILES32', '$COMMONFILES64',
+  '$DESKTOP', '$EXEDIR', '$EXEFILE', '$EXEPATH', '${NSISDIR}', '$WINDIR',
+  '$SYSDIR', '$TEMP', '$STARTMENU', '$SMPROGRAMS', '$SMSTARTUP',
+  '$QUICKLAUNCH','$DOCUMENTS', '$SENDTO', '$RECENT', '$FAVORITES', '$MUSIC',
+  '$PICTURES', '$VIDEOS', '$NETHOOD', '$FONTS', '$TEMPLATES', '$APPDATA',
+  '$LOCALAPPDATA', '$PRINTHOOD', '$INTERNET_CACHE', '$COOKIES', '$HISTORY',
+  '$PROFILE', '$ADMINTOOLS', '$RESOURCES', '$RESOURCES_LOCALIZED',
+  '$CDBURN_AREA', '$HWNDPARENT', '$PLUGINSDIR',
+}, '$_{}'))
+-- TODO? Constants used in strings: $$ $\r $\n $\t
+
+-- Labels (4.3).
+local label = token(l.LABEL, l.word * ':')
+
+-- Keywords.
+local keyword = token(l.KEYWORD, word_match({
+-- Pages (4.5).
+  'Page', 'UninstPage', 'PageEx', 'PageEnd', 'PageExEnd',
+-- Section commands (4.6).
+  'AddSize', 'Section', 'SectionEnd', 'SectionIn', 'SectionGroup',
+  'SectionGroupEnd',
+-- Functions (4.7).
+  'Function', 'FunctionEnd',
+-- Callbacks (4.7.2).
+  '.onGUIInit', '.onInit', '.onInstFailed', '.onInstSuccess', '.onGUIEnd',
+  '.onMouseOverSection', '.onRebootFailed', '.onSelChange', '.onUserAbort',
+  '.onVerifyInstDir', 'un.onGUIInit', 'un.onInit', 'un.onUninstFailed',
+  'un.onUninstSuccess', 'un.onGUIEnd', 'un.onRebootFailed', 'un.onSelChange',
+  'un.onUserAbort',
+-- General Attributes (4.8.1).
+  'AddBrandingImage', 'AllowRootDirInstall', 'AutoCloseWindow', 'BGFont',
+  'BGFont', 'BrandingText', '/TRIMLEFT', '/TRIMRIGHT', '/TRIMCENTER', 'Caption',
+  'ChangeUI', 'CheckBitmap', 'CompletedText', 'ComponentText', 'CRCCheck',
+  'DetailsButtonText', 'DirText', 'DirVar', 'DirVerify', 'FileErrorText',
+  'Icon', 'InstallButtonText', 'InstallColors', 'InstallDir',
+  'InstallDirRegKey', 'InstProgressFlags', 'InstType', 'LicenseBkColor',
+  'LicenseData', 'LicenseForceSelection', 'LicenseText', 'MiscButtonText',
+  'Name', 'OutFile', 'RequestExecutionLevel', 'SetFont', 'ShowInstDetails',
+  'ShowUninstDetails', 'SilentInstall', 'SilentUnInstall', 'SpaceTexts',
+  'SubCaption', 'UninstallButtonText', 'UninstallCaption', 'UninstallIcon',
+  'UninstallSubCaption', 'UninstallText', 'WindowIcon', 'XPStyle', 'admin',
+  'auto', 'bottom', 'checkbox', 'false', 'force', 'height', 'hide', 'highest',
+  'leave', 'left', 'nevershow', 'none', 'normal', 'off', 'on', 'radiobuttons',
+  'right', 'show', 'silent', 'silentlog', 'top', 'true', 'user', 'width',
+-- Compiler Flags (4.8.2).
+  'AllowSkipFiles', 'FileBufSize', 'SetCompress', 'SetCompressor',
+  '/SOLID', '/FINAL', 'zlib', 'bzip2', 'lzma', 'SetCompressorDictSize',
+  'SetDatablockOptimize', 'SetDateSave', 'SetOverwrite', 'ifnewer', 'ifdiff',
+  'lastused', 'try',
+-- Version Information (4.8.3).
+  'VIAddVersionKey', 'VIProductVersion', '/LANG',
+  'ProductName', 'Comments', 'CompanyName', 'LegalCopyright', 'FileDescription',
+  'FileVersion', 'ProductVersion', 'InternalName', 'LegalTrademarks',
+  'OriginalFilename', 'PrivateBuild', 'SpecialBuild',
+-- Basic Instructions (4.9.1).
+  'Delete', '/REBOOTOK', 'Exec', 'ExecShell', 'ExecShell', 'File', '/nonfatal',
+  'Rename', 'ReserveFile', 'RMDir', 'SetOutPath',
+-- Registry, INI, File Instructions (4.9.2).
+  'DeleteINISec', 'DeleteINIStr', 'DeleteRegKey', '/ifempty',
+  'DeleteRegValue', 'EnumRegKey', 'EnumRegValue', 'ExpandEnvStrings',
+  'FlushINI', 'ReadEnvStr', 'ReadINIStr', 'ReadRegDWORD', 'ReadRegStr',
+  'WriteINIStr', 'WriteRegBin', 'WriteRegDWORD', 'WriteRegStr',
+  'WriteRegExpandStr', 'HKCR', 'HKEY_CLASSES_ROOT', 'HKLM', 'HKEY_LOCAL_MACHINE',
+  'HKCU', 'HKEY_CURRENT_USER', 'HKU', 'HKEY_USERS', 'HKCC',
+  'HKEY_CURRENT_CONFIG', 'HKDD', 'HKEY_DYN_DATA', 'HKPD',
+  'HKEY_PERFORMANCE_DATA', 'SHCTX', 'SHELL_CONTEXT',
+
+-- General Purpose Instructions (4.9.3).
+  'CallInstDLL', 'CopyFiles',
+  '/SILENT', '/FILESONLY', 'CreateDirectory', 'CreateShortCut', 'GetDLLVersion',
+  'GetDLLVersionLocal', 'GetFileTime', 'GetFileTimeLocal', 'GetFullPathName',
+  '/SHORT', 'GetTempFileName', 'SearchPath', 'SetFileAttributes', 'RegDLL',
+  'UnRegDLL',
+-- Flow Control Instructions (4.9.4).
+  'Abort', 'Call', 'ClearErrors', 'GetCurrentAddress', 'GetFunctionAddress',
+  'GetLabelAddress', 'Goto', 'IfAbort', 'IfErrors', 'IfFileExists',
+  'IfRebootFlag', 'IfSilent', 'IntCmp', 'IntCmpU', 'MessageBox', 'MB_OK',
+  'MB_OKCANCEL', 'MB_ABORTRETRYIGNORE', 'MB_RETRYCANCEL', 'MB_YESNO',
+  'MB_YESNOCANCEL', 'MB_ICONEXCLAMATION', 'MB_ICONINFORMATION',
+  'MB_ICONQUESTION', 'MB_ICONSTOP', 'MB_USERICON', 'MB_TOPMOST',
+  'MB_SETFOREGROUND', 'MB_RIGHT', 'MB_RTLREADING', 'MB_DEFBUTTON1',
+  'MB_DEFBUTTON2', 'MB_DEFBUTTON3', 'MB_DEFBUTTON4', 'IDABORT', 'IDCANCEL',
+  'IDIGNORE', 'IDNO', 'IDOK', 'IDRETRY', 'IDYES', 'Return', 'Quit', 'SetErrors',
+  'StrCmp', 'StrCmpS',
+-- File Instructions (4.9.5).
+  'FileClose', 'FileOpen', 'FileRead', 'FileReadByte', 'FileSeek', 'FileWrite',
+  'FileWriteByte', 'FindClose', 'FindFirst', 'FindNext',
+-- Uninstaller Instructions (4.9.6).
+  'WriteUninstaller',
+-- Miscellaneous Instructions (4.9.7).
+  'GetErrorLevel', 'GetInstDirError', 'InitPluginsDir', 'Nop', 'SetErrorLevel',
+  'SetRegView', 'SetShellVarContext', 'all', 'current', 'Sleep',
+-- String Manipulation Instructions (4.9.8).
+  'StrCpy', 'StrLen',
+-- Stack Support (4.9.9).
+  'Exch', 'Pop', 'Push',
+-- Integer Support (4.9.10).
+  'IntFmt', 'IntOp',
+-- Reboot Instructions (4.9.11).
+  'Reboot', 'SetRebootFlag',
+-- Install Logging Instructions (4.9.12).
+  'LogSet', 'LogText',
+-- Section Management (4.9.13).
+  'SectionSetFlags', 'SectionGetFlags', 'SectionGetFlags',
+  'SectionSetText', 'SectionGetText', 'SectionSetInstTypes',
+  'SectionGetInstTypes', 'SectionSetSize', 'SectionGetSize', 'SetCurInstType',
+  'GetCurInstType', 'InstTypeSetText', 'InstTypeGetText',
+-- User Interface Instructions (4.9.14).
+  'BringToFront', 'CreateFont', 'DetailPrint', 'EnableWindow', 'FindWindow',
+  'GetDlgItem', 'HideWindow', 'IsWindow', 'LockWindow', 'SendMessage',
+  'SetAutoClose', 'SetBrandingImage', 'SetDetailsView', 'SetDetailsPrint',
+  'listonly','textonly', 'both', 'SetCtlColors', '/BRANDING', 'SetSilent',
+  'ShowWindow',
+-- Multiple Languages Instructions (4.9.15).
+  'LoadLanguageFile', 'LangString', 'LicenseLangString',
+-- Compile time commands (5).
+  '!include', '!addincludedir', '!addplugindir', '!appendfile', '!cd',
+  '!delfile', '!echo', '!error', '!execute', '!packhdr', '!system', '!tempfile',
+  '!warning', '!verbose', '{__FILE__}', '{__LINE__}', '{__DATE__}',
+  '{__TIME__}', '{__TIMESTAMP__}', '{NSIS_VERSION}', '!define', '!undef',
+  '!ifdef', '!ifndef', '!if', '!ifmacrodef', '!ifmacrondef', '!else', '!endif',
+  '!insertmacro', '!macro', '!macroend', '!searchparse', '!searchreplace',
+}, '/!.{}_'))
+
+-- Operators.
+local operator = token(l.OPERATOR, S('+-*/%|&^~!<>'))
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.word)
+
+M._rules = {
+  {'whitespace', ws},
+  {'comment', comment},
+  {'string', string},
+  {'constant', constant},
+  {'variable', variable},
+  {'keyword', keyword},
+  {'number', number},
+  {'operator', operator},
+  {'label', label},
+  {'identifier', identifier},
+}
+
+return M