Add lua installation .cmd for appveyor

.appveyor/install-lua.cmd

@@ -0,0 +1,98 @@
+REM https://github.com/bluebird75/luaunit/blob/80e5b37e0f3e0016dcf7dff0004a4d065cd4ee61/.appveyor/install-lua.cmd
+REM BSD license: https://github.com/bluebird75/luaunit/blob/7382208f9e7ff433e0bf3feeb1990bcab1de9877/LICENSE.txt
+
+REM This is a batch file to help with setting up the desired Lua environment.
+REM It is intended to be run as "install" step from within AppVeyor.
+
+REM version numbers and file names for binaries from http://sf.net/p/luabinaries/
+set VER_51=5.1.5
+set VER_52=5.2.4
+set VER_53=5.3.3
+set ZIP_51=lua-%VER_51%_Win32_bin.zip
+set ZIP_52=lua-%VER_52%_Win32_bin.zip
+set ZIP_53=lua-%VER_53%_Win32_bin.zip
+
+:cinst
+@echo off
+if NOT "%LUAENV%"=="cinst" goto lua51
+echo Chocolatey install of Lua ...
+if NOT EXIST "C:\Program Files (x86)\Lua\5.1\lua.exe" (
+    @echo on
+    cinst lua
+) else (
+    @echo on
+    echo Using cached version of Lua
+)
+set LUA="C:\Program Files (x86)\Lua\5.1\lua.exe"
+@echo off
+goto :EOF
+
+:lua51
+@echo off
+if NOT "%LUAENV%"=="lua51" goto lua52
+echo Setting up Lua 5.1 ...
+if NOT EXIST "lua51\lua5.1.exe" (
+    @echo on
+    echo Fetching Lua v5.1 from internet
+    curl -fLsS -o %ZIP_51% http://sourceforge.net/projects/luabinaries/files/%VER_51%/Tools%%20Executables/%ZIP_51%/download
+    unzip -d lua51 %ZIP_51%
+) else (
+    echo Using cached version of Lua v5.1
+)
+set LUA=lua51\lua5.1.exe
+@echo off
+goto :EOF
+
+:lua52
+@echo off
+if NOT "%LUAENV%"=="lua52" goto lua53
+echo Setting up Lua 5.2 ...
+if NOT EXIST "lua52\lua52.exe" (
+    @echo on
+    echo Fetching Lua v5.2 from internet
+    curl -fLsS -o %ZIP_52% http://sourceforge.net/projects/luabinaries/files/%VER_52%/Tools%%20Executables/%ZIP_52%/download
+    unzip -d lua52 %ZIP_52%
+) else (
+    echo Using cached version of Lua v5.2
+)
+@echo on
+set LUA=lua52\lua52.exe
+@echo off
+goto :EOF
+
+:lua53
+@echo off
+if NOT "%LUAENV%"=="lua53" goto luajit
+echo Setting up Lua 5.3 ...
+if NOT EXIST "lua53\lua53.exe" (
+    @echo on
+    echo Fetching Lua v5.3 from internet
+    curl -fLsS -o %ZIP_53% http://sourceforge.net/projects/luabinaries/files/%VER_53%/Tools%%20Executables/%ZIP_53%/download
+    unzip -d lua53 %ZIP_53%
+) else (
+    echo Using cached version of Lua v5.3
+)
+@echo on
+set LUA=lua53\lua53.exe
+@echo off
+goto :EOF
+
+:luajit
+if NOT "%LUAENV%"=="luajit20" goto luajit21
+echo Setting up LuaJIT 2.0 ...
+if NOT EXIST "luajit20\luajit.exe" (
+    call %~dp0install-luajit.cmd LuaJIT-2.0.4 luajit20
+) else (
+    echo Using cached version of LuaJIT 2.0
+)
+set LUA=luajit20\luajit.exe
+goto :EOF
+
+:luajit21
+echo Setting up LuaJIT 2.1 ...
+if NOT EXIST "luajit21\luajit.exe" (
+    call %~dp0install-luajit.cmd LuaJIT-2.1.0-beta2 luajit21
+) else (
+    echo Using cached version of LuaJIT 2.1
+)
+set LUA=luajit21\luajit.exe

.gitignore

@@ -1,6 +1,7 @@
 # exclude all dot files except .git and travis files
 .*
 !.git*
+!.appveyor*
 !.travis.yml
 
 # exclude binaries and temporary files

appveyor.yml

@@ -21,6 +21,10 @@ environment:
   - tbs_arch: x64
     tbs_tools: msvc
     tbs_config: Release
+install:
+- SET LUAENV=lua51
+- cmd: .appveyor\install-lua.cmd
+
 build_script:
 - C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin\mingw32-make --version
 - C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin\g++ --version