modify appveyor

.appveyor.yml

@@ -7,7 +7,13 @@ platform:
   - Win64
 
 before_build:
-  - ps: Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Invoke-Webrequest "https://raw.githubusercontent.com/tboox/xmake/dev/scripts/get.ps1" -UseBasicParsing).Content)) -ArgumentList "repo"
+  - ps: Invoke-Command -ScriptBlock ([ScriptBlock]::Create((Invoke-Webrequest "https://raw.githubusercontent.com/xmake-io/xmake/dev/scripts/get.ps1" -UseBasicParsing).Content)) -ArgumentList "dev"
+  - cmd: xmake --version
+  - cmd: git clone https://github.com/xmake-io/xmake.git -b repo
+  - cmd: cd xmake
+  - cmd: xmake -P core 
+  - cmd: set XMAKE_PROGRAM_DIR=%cd%\xmake
+  - ps: Copy-Item -Force core\build\xmake.exe $HOME\xmake
   - cmd: xmake --version
 
 build_script:

scripts/test.lua

@@ -8,9 +8,10 @@ function main(...)
                 table.insert(packages, package)
             end
         end
+    end
+    if #packages == 0 then
         table.insert(packages, "tbox")
     end
-    if #packages > 0 then
     local repodir = os.curdir()
     local workdir = path.join(os.tmpdir(), "xmake-repo")
     print(packages)
@@ -23,4 +24,3 @@ function main(...)
     os.exec("xmake repo -l")
     os.exec("xmake require -f -v -D -y %s", table.concat(packages, " "))
 end
-end