thodg/libgit2

diff --git a/appveyor.yml b/appveyor.yml
index 5eac5f1..d89e3fb 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,52 +10,35 @@ environment:
 
   matrix:
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
-    GENERATOR: "Visual Studio 10 2010"
-    ARCH: 32
+    CMAKE_OPTIONS: -G"Visual Studio 10 2010"
+    ARCH: x86
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
-    GENERATOR: "Visual Studio 10 2010 Win64"
-    ARCH: 64
+    CMAKE_OPTIONS: -G"Visual Studio 10 2010 Win64"
+    ARCH: amd64
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    GENERATOR: "Visual Studio 14 2015"
-    ARCH: 32
+    CMAKE_OPTIONS: -G"Visual Studio 14 2015"
+    ARCH: x86
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    GENERATOR: "Visual Studio 14 2015 Win64"
-    ARCH: 64
+    CMAKE_OPTIONS: -G"Visual Studio 14 2015 Win64"
+    ARCH: amd64
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    GENERATOR: "MSYS Makefiles"
-    ARCH: i686 # this is for 32-bit MinGW-w64
+    CMAKE_OPTIONS: -G"MinGW Makefiles"
+    ARCH: x86
   - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    GENERATOR: "MSYS Makefiles"
-    ARCH: 64
-cache:
-- i686-4.9.2-release-win32-sjlj-rt_v3-rev1.7z
-- x86_64-4.9.2-release-win32-seh-rt_v3-rev1.7z
+    CMAKE_OPTIONS: -G"MinGW Makefiles"
+    ARCH: amd64
 
-build_script:
+install:
+- set PATH=%TEMP%\mingw64\bin;%TEMP%\mingw32\bin;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\CMake\bin
 - ps: |
     mkdir build
     cd build
-    if ($env:GENERATOR -ne "MSYS Makefiles") {
-      cmake -D ENABLE_TRACE=ON -D BUILD_CLAR=ON -D BUILD_EXAMPLES=ON -D MSVC_CRTDBG=ON .. -G"$env:GENERATOR"
-      cmake --build . --config Debug
+    if ($env:CMAKE_OPTIONS -eq '-G"MinGW Makefiles"') {
+      ../ci/setup-mingw.ps1
     }
-- cmd: |
-    if "%GENERATOR%"=="MSYS Makefiles" (C:\MinGW\msys\1.0\bin\sh --login /c/projects/libgit2/script/appveyor-mingw.sh)
+
+build_script:
+- cmd: powershell ../ci/build.ps1
+
 test_script:
-- ps: |
-    # Disable DHE key exchange to fix intermittent build failures ("A buffer
-    # provided was too small") due to SChannel bug. See e.g.
-    # - https://github.com/aws/aws-sdk-cpp/issues/671
-    # - https://github.com/dotnet/corefx/issues/7812
-    New-Item HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman -Force | New-ItemProperty -Name Enabled -Value 0 -Force
-    $ErrorActionPreference="Stop"
-    Start-FileDownload https://github.com/ethomson/poxyproxy/releases/download/v0.1.0/poxyproxy-0.1.0.jar -FileName poxyproxy.jar
-    # Run this early so we know it's ready by the time we need it
-    $proxyJob = Start-Job { java -jar $Env:APPVEYOR_BUILD_FOLDER\build\poxyproxy.jar -d --port 8080 --credentials foo:bar }
-    ctest -V -R offline
-    ctest -V -R online
-    Receive-Job -Job $proxyJob
-    $env:GITTEST_REMOTE_PROXY_URL = "localhost:8080"
-    $env:GITTEST_REMOTE_PROXY_USER = "foo"
-    $env:GITTEST_REMOTE_PROXY_PASS = "bar"
-    ctest -V -R proxy
+- cmd: powershell ../ci/test.ps1
diff --git a/script/appveyor-mingw.sh b/script/appveyor-mingw.sh
deleted file mode 100755
index 6b2a942..0000000
--- a/script/appveyor-mingw.sh
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/bin/sh
-set -e
-cd `dirname "$0"`/..
-if [ "$ARCH" = "i686" ]; then
-  f=i686-4.9.2-release-win32-sjlj-rt_v3-rev1.7z
-  if ! [ -e $f ]; then
-    curl -LsSO http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/4.9.2/threads-win32/sjlj/$f
-  fi
-  7z x $f > /dev/null
-  export PATH=`pwd`/mingw32/bin:$PATH
-else
-  f=x86_64-4.9.2-release-win32-seh-rt_v3-rev1.7z
-  if ! [ -e $f ]; then
-    curl -LsSO http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/4.9.2/threads-win32/seh/$f
-  fi
-  7z x $f > /dev/null
-  export PATH=`pwd`/mingw64/bin:$PATH
-fi
-cd build
-gcc --version
-cmake --version
-cmake -D ENABLE_TRACE=ON -D BUILD_CLAR=ON -D BUILD_EXAMPLES=ON .. -G"$GENERATOR"
-cmake --build . --config RelWithDebInfo