From a1fa5dc3cb788635a10879c391e6fd54639f074b Mon Sep 17 00:00:00 2001
From: Ryan Foster <RytoEX@gmail.com>
Date: Sat, 28 Oct 2017 00:10:36 -0400
Subject: [PATCH] Windows CI: Only build obs-studio if not cached

Run a series of checks to determine if CI needs to build obs-studio
before trying to build obs-websocket.
---
 CI/install-build-obs.cmd | 118 +++++++++++++++++++++++++++++++++++++++
 appveyor.yml             |  17 ++----
 2 files changed, 122 insertions(+), 13 deletions(-)
 create mode 100644 CI/install-build-obs.cmd

diff --git a/CI/install-build-obs.cmd b/CI/install-build-obs.cmd
new file mode 100644
index 00000000..bad23d9d
--- /dev/null
+++ b/CI/install-build-obs.cmd
@@ -0,0 +1,118 @@
+@echo off
+SETLOCAL EnableDelayedExpansion
+
+REM Check if obs-studio build exists.
+REM If the obs-studio directory does exist, check if the last OBS tag built
+REM matches the latest OBS tag.
+REM If the tags match, do not build obs-studio.
+REM If the tags do not match, build obs-studio.
+REM If the obs-studio directory doesn't exist, build obs-studio.
+echo Checking for obs-studio build...
+
+set OBSLatestTagPrePull=0
+set OBSLatestTagPostPull=0
+echo Latest tag pre-pull: %OBSLatestTagPrePull%
+echo Latest tag post-pull: %OBSLatestTagPostPull%
+
+REM Set up the build flag as undefined.
+set "BuildOBS="
+
+REM Check the last tag successfully built by CI.
+if exist C:\projects\obs-studio-last-tag-built.txt (
+  set /p OBSLastTagBuilt=<C:\projects\obs-studio-last-tag-built.txt
+) else (
+  set OBSLastTagBuilt=0
+)
+
+REM If obs-studio directory exists, run git pull and get the latest tag number.
+if exist C:\projects\obs-studio\ (
+  echo obs-studio directory exists
+  echo   Updating tag info
+  cd C:\projects\obs-studio\
+  git describe --tags --abbrev=0 > C:\projects\latest-obs-studio-tag-pre-pull.txt
+  set /p OBSLatestTagPrePull=<C:\projects\latest-obs-studio-tag-pre-pull.txt
+  git checkout master
+  git pull
+  git describe --tags --abbrev=0 > C:\projects\latest-obs-studio-tag-post-pull.txt
+  set /p OBSLatestTagPostPull=<C:\projects\latest-obs-studio-tag-post-pull.txt
+  set /p OBSLatestTag=<C:\projects\latest-obs-studio-tag-post-pull.txt
+  echo %OBSLatestTagPostPull%> C:\projects\latest-obs-studio-tag.txt
+)
+
+REM Check the obs-studio tags for mismatches.
+REM If a new tag was pulled, set the build flag.
+if not %OBSLatestTagPrePull%==%OBSLatestTagPostPull% (
+  echo Latest tag pre-pull: %OBSLatestTagPrePull%
+  echo Latest tag post-pull: %OBSLatestTagPostPull%
+  echo Tags do not match.  Need to rebuild OBS.
+  set BuildOBS=true
+)
+
+REM If the latest git tag doesn't match the last built tag, set the build flag.
+if not %OBSLatestTagPostPull%==%OBSLastTagBuilt% (
+  echo Last built OBS tag: %OBSLastTagBuilt%
+  echo Latest tag post-pull: %OBSLatestTagPostPull%
+  echo Tags do not match.  Need to rebuild OBS.
+  set BuildOBS=true
+)
+
+REM If obs-studio directory does not exist, clone the git repo, get the latest
+REM tag number, and set the build flag.
+if not exist C:\projects\obs-studio (
+  echo obs-studio directory does not exist
+  git clone --recursive https://github.com/jp9000/obs-studio
+  cd C:\projects\obs-studio\
+  git describe --tags --abbrev=0 > C:\projects\obs-studio-latest-tag.txt
+  set /p OBSLatestTag=<C:\projects\obs-studio-latest-tag.txt
+  set BuildOBS=true
+)
+
+REM Some debug info
+echo:
+echo Latest tag pre-pull: %OBSLatestTagPrePull%
+echo Latest tag post-pull: %OBSLatestTagPostPull%
+echo Latest tag: %OBSLatestTag%
+echo Last built OBS tag: %OBSLastTagBuilt%
+
+if defined BuildOBS (
+  echo BuildOBS: true
+) else (
+  echo BuildOBS: false
+)
+echo:
+
+REM If the build flag is set, build obs-studio.
+if defined BuildOBS (
+  echo Building obs-studio...
+  echo   git checkout %OBSLatestTag%
+  git checkout %OBSLatestTag%
+  echo:
+  echo   Removing previous build dirs...
+  if exist build rmdir /s /q C:\projects\obs-studio\build
+  if exist build32 rmdir /s /q C:\projects\obs-studio\build32
+  if exist build64 rmdir /s /q C:\projects\obs-studio\build64
+  echo   Making new build dirs...
+  mkdir build
+  mkdir build32
+  mkdir build64
+  echo   Running cmake for obs-studio %OBSLatestTag% 32-bit...
+  cd ./build32
+  cmake -G "Visual Studio 12 2013" -DCOPIED_DEPENDENCIES=false -DCOPY_DEPENDENCIES=true ..
+  echo:
+  echo:
+  echo   Running cmake for obs-studio %OBSLatestTag% 64-bit...
+  cd ../build64
+  cmake -G "Visual Studio 12 2013 Win64" -DCOPIED_DEPENDENCIES=false -DCOPY_DEPENDENCIES=true ..
+  echo:
+  echo:
+  echo   Building obs-studio %OBSLatestTag% 32-bit ^(Build Config: %build_config%^)...
+  call msbuild /m /p:Configuration=%build_config% C:\projects\obs-studio\build32\obs-studio.sln /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
+  echo   Building obs-studio %OBSLatestTag% 64-bit ^(Build Config: %build_config%^)...
+  call msbuild /m /p:Configuration=%build_config% C:\projects\obs-studio\build64\obs-studio.sln /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
+  cd ..
+  git describe --tags --abbrev=0 > C:\projects\obs-studio-last-tag-built.txt
+  set /p OBSLastTagBuilt=<C:\projects\obs-studio-last-tag-built.txt
+) else (
+  echo Last OBS tag built is:  %OBSLastTagBuilt%
+  echo No need to rebuild OBS.
+)
diff --git a/appveyor.yml b/appveyor.yml
index 70a932ff..4dda34d1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -13,18 +13,7 @@ install:
   - set QTDIR32=%CD%\Qt5.7.0\msvc2013
   - set QTDIR64=%CD%\Qt5.7.0\msvc2013_64
   - set build_config=Release
-  - git clone --recursive https://github.com/jp9000/obs-studio
-  - cd C:\projects\obs-studio\
-  - git checkout 20.1.0
-  - mkdir build
-  - mkdir build32
-  - mkdir build64
-  - cd ./build32
-  - cmake -G "Visual Studio 12 2013" -DCOPIED_DEPENDENCIES=false -DCOPY_DEPENDENCIES=true ..
-  - cd ../build64
-  - cmake -G "Visual Studio 12 2013 Win64" -DCOPIED_DEPENDENCIES=false -DCOPY_DEPENDENCIES=true ..
-  - call msbuild /m /p:Configuration=%build_config% C:\projects\obs-studio\build32\obs-studio.sln /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
-  - call msbuild /m /p:Configuration=%build_config% C:\projects\obs-studio\build64\obs-studio.sln /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
+  - call C:\projects\obs-websocket\CI\install-build-obs.cmd
   - cd C:\projects\obs-websocket\
   - mkdir build32
   - mkdir build64
@@ -47,4 +36,6 @@ test: off
 
 cache:
   - C:\projects\dependencies2013.zip
-  - C:\projects\qt570.zip
\ No newline at end of file
+  - C:\projects\qt570.zip
+  - C:\projects\obs-studio-last-tag-built.txt
+  - C:\projects\obs-studio\