gplugin/gplugin

Python3 has started shipping multiple pc files so we need to check for all of them similar to lua.

2021-07-23, Gary Kramlich
bf9af95cb6d4
Python3 has started shipping multiple pc files so we need to check for all of them similar to lua.

Testing Done:
Ran on debian unstable with python3.10 and python3.9 installed. pygobject doesn't current work with python3.10 according to the test output but python3.9 worked fine.

```
Dependency pygobject-3.0 found: YES 3.38.0 (cached)
Found pkg-config: /usr/bin/pkg-config (0.29.2)
Run-time dependency python-3.10-embed found: YES 3.10
Checking if "Python3 GI" with dependencies glib-2.0, python-3.10-embed, pygobject-3.0 runs: NO (255)
Message: pygobject does not work with python-3.10-embed
Run-time dependency python-3.9-embed found: YES 3.9
Checking if "Python3 GI" with dependencies glib-2.0, python-3.9-embed, pygobject-3.0 runs: YES
```

Reviewed at https://reviews.imfreedom.org/r/832/
if get_option('lua')
if not get_option('introspection')
error('Lua plugin requires GObject Introspection.')
endif
GPLUGIN_LUA_SOURCES = [
'gplugin-lua-core.c',
'gplugin-lua-loader.c',
'gplugin-lua-plugin.c',
]
GPLUGIN_LUA_HEADERS = [
'gplugin-lua-loader.h',
'gplugin-lua-plugin.h',
]
# These are ordered from most to least preferred, which would normally
# be from the highest to lowest version.
_LUAS = [
['lua-5.3', '>=5.3.0'],
['lua5.3', '>=5.3.0'],
['lua-5.2', '>=5.2.0'],
['lua5.2', '>=5.2.0'],
['lua52', '>=5.2.0'],
['luajit', '>=2.0.0'],
['lua-5.1', '>=5.1.0'],
['lua5.1', '>=5.1.0'],
['lua', '>=5.1.0'],
]
LUA_FOUND = false
foreach _LUA : _LUAS
LUA = dependency(_LUA[0], version : _LUA[1], required : false)
if LUA.found()
# Compile and run our lua-lgi test program
lua_lgi_test = compiler.run(files('gplugin-lua-test-lgi.c'),
dependencies : LUA,
name : 'lua "lgi" module')
if lua_lgi_test.compiled() and lua_lgi_test.returncode() == 0
LUA_FOUND = true
break
endif
endif
endforeach
if not LUA_FOUND
error('No usable Lua library was found')
endif
# now add the library
shared_library('gplugin-lua',
GPLUGIN_LUA_SOURCES,
GPLUGIN_LUA_HEADERS,
name_prefix : '',
dependencies : [LUA, gplugin_dep],
install : true,
install_dir : get_option('libdir') / 'gplugin'
)
endif # lua
subdir('tests')