Add Cmake Closes #110

[Lasall]

• Targets Linux only.
• For CMake simplifications I changed variable name ___PREFIX___ in man .in files to @___PREFIX___@ and adjusted the Makefile
• I tried to stay as close as possible to to pro/pri files.
• There is a third party file cmake/FindHUNSPELL.cmake included which is BSD-3 licenced.
• Adding support for different platforms should be fairly easy. I don't have access to macOS but at work I use https://github.com/leetal/ios-cmake. Then apart from installation instructions https://cmake.org/cmake/help/latest/prop_tgt/MACOSX_BUNDLE_INFO_PLIST.html has to be set for the APPLE platform.
• I noticed there were two variables to change the build/install process: community and PREVIEW. For CMake those can be configured during configure process with: cmake -DPREVIEW=abc -DCOMMUNITY=xyz

I didn't compare the (Linux) compiler flags with qmake. The CMake compile instructions can be generated with the option -DCMAKE_EXPORT_COMPILE_COMMANDS=ON which generates a file compile_commands.json.

Following steps will configure and build the project (change Qt install path and any make options accordingly):

cmake -B build-cmake -DCMAKE_PREFIX_PATH=/opt/Qt/5.15.2/gcc_64
cmake --build build-cmake -- -j8
sudo cmake --install build-cmake  # or DESTDIR=foobar cmake --install build-cmake

[ElTh0r0]

Many thanks @Lasall I'll need some time before merging it - not because I don't trust you that it is working as expected, but I want to (try to) understand the provided cmake setup and do some tests since I never used cmake before :)

[Lasall]

No worries, on the way you can maybe add the missing macOS instructions. I might find some time next week to add missing Windows instructions. Will also compare the build instructions (compile_commands.json) to make sure the compiler invocations are the same. Does InyokaEdit generally work with Qt6? If so we could add an option for Qt6.

[ElTh0r0]

Yes Qt6 is working! There are only two things to be considered:

• QWebEngineView is not available for Qt6 yet (should be available with Qt 6.2), so the editor has to be compiled without preview.
• Spellchecker plugin needs "core5compat" if compiled with Qt6: https://github.com/inyokaproject/inyokaedit/blob/21899d48bdd425a0d5b4fd8b022881b9cec71fa9/plugins/spellchecker/spellchecker.pro#L64

[ElTh0r0]

It took me longer than expected to find time to test it. In the end testing was quite easy, but for sure I would not have been able to write the cmake files myself! One more time: Many thanks Lasall!