use powershell instead of cmd

appveyor.yml

@@ -9,7 +9,7 @@ install:
   - ps: Import-Module CoApp
 
 build_script:
-  - ps: .\scripts\nuget_build.bat
+  - ps: .\scripts\nuget_build.ps1
 
 test_script:
   - ps: .\tests\autotest-appveyor.ps1

scripts/nuget_build.bat → scripts/nuget_build.ps1

-@echo off
-cd %~dp0
+Push-Location
+$scriptdir = Split-Path $MyInvocation.MyCommand.Path
+cd $scriptdir
 
-"%VS141COMNTOOLS%\VsMSBuildCmd.bat" && ^
-msbuild pugixml_vs2013_static.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x86 /v:minimal /nologo && ^
-msbuild pugixml_vs2013_static.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x86 /v:minimal /nologo && ^
-msbuild pugixml_vs2013_static.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x64 /v:minimal /nologo && ^
-msbuild pugixml_vs2013_static.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x64 /v:minimal /nologo && ^
-msbuild pugixml_vs2015.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x86 /v:minimal /nologo && ^
-msbuild pugixml_vs2015.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x86 /v:minimal /nologo && ^
-msbuild pugixml_vs2015.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x64 /v:minimal /nologo && ^
-msbuild pugixml_vs2015.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x64 /v:minimal /nologo && ^
-msbuild pugixml_vs2017.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x86 /v:minimal /nologo && ^
-msbuild pugixml_vs2017.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x86 /v:minimal /nologo && ^
-msbuild pugixml_vs2017.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x64 /v:minimal /nologo && ^
-msbuild pugixml_vs2017.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x64 /v:minimal /nologo && ^
-powershell Write-NuGetPackage nuget.autopkg
+"%VS141COMNTOOLS%\VsMSBuildCmd.bat"
+msbuild pugixml_vs2013_static.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x86 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2013_static.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x86 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2013_static.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x64 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2013_static.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x64 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2015.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x86 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2015.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x86 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2015.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x64 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2015.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x64 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2017.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x86 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2017.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x86 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2017.vcxproj /t:Rebuild /p:Configuration=Debug /p:Platform=x64 /v:minimal /nologo
+If(!$?){exit 1}
+msbuild pugixml_vs2017.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x64 /v:minimal /nologo
+If(!$?){exit 1}
+Write-NuGetPackage nuget.autopkg
+If(!$?){exit 1}
+
+Pop-Location