WIP Plugins common code, initial implementation

[375gnu]

hi this a basic code for plugin based architecture, it's not integrated with any other parts of celestia. i push it for testing.

cmakelists.txt in src/celplugin generates 2 files - plugintest and libmyplug.so. please build them and test.

@eyvallah how libmyplug.so is named on macos?

[levinli303]

It should be libmyplug.dylib on Mac

[levinli303]

so i built the it, with modification to the CMakeLists(C++11, gettext). it works. it builds an .so file because in CMakeLists.txt it is a module library.

So on mac, it can be either MODULE -> .so or SHARED -> .dylib. however i do feel like it's more common to see .dylib library plugins

the output should be correct:
dlsym(CreateScriptEnvironment) failed: dlsym(0x7ffcd1602070, CreateScriptEnvironment): symbol not found
APIVersion = 107, Type = 1, ID = 0x10b22efa0
LUA
0x7ffcd1500dd0 0x7ffcd1500dd0

[pirogronian]

How to build it in painless way? I cannot make it by make celplugin, while initiating and making directly in its directory throws compile error fatal error: fmt/printf.h. Have I build whole Celestia for it?

[375gnu]

i'm unsure if it's easily buildable today. i even don't remember in what state it was left.