typelib: Use GIRepository to find typelib path

blueprintcompiler/gir.py

@@ -21,6 +21,10 @@ from functools import cached_property
 import typing as T
 import os, sys
 
+import gi # type: ignore
+gi.require_version("GIRepository", "2.0")
+from gi.repository import GIRepository # type: ignore
+
 from .errors import CompileError, CompilerBugError
 from . import typelib, xml_reader
 
@@ -29,25 +33,7 @@ _xml_cache = {}
 
 
 def get_namespace(namespace, version):
-    from .main import LIBDIR, VERSION
-    search_paths = []
-    if LIBDIR is not None:
-        search_paths.append(os.path.join(LIBDIR, "girepository-1.0"))
-
-    # This is a fragile hack to make blueprint-compiler work uninstalled on
-    # most systems.
-    if VERSION == "uninstalled":
-        search_paths += [
-            "/usr/lib/girepository-1.0",
-            "/usr/local/lib/girepository-1.0",
-            "/app/lib/girepository-1.0",
-            "/usr/lib64/girepository-1.0",
-            "/usr/local/lib64/girepository-1.0",
-            "/app/lib64/girepository-1.0",
-        ]
-
-    if typelib_path := os.environ.get("GI_TYPELIB_PATH"):
-        search_paths.append(typelib_path)
+    search_paths = GIRepository.Repository.get_search_path()
 
     filename = f"{namespace}-{version}.typelib"
 
@@ -76,14 +62,6 @@ def get_xml(namespace, version):
     from xml.etree import ElementTree
     search_paths = []
 
-    # Same fragile hack as before
-    if VERSION == "uninstalled":
-        search_paths += [
-            "/usr/share/gir-1.0",
-            "/usr/local/share/gir-1.0",
-            "/app/share/gir-1.0",
-        ]
-
     if data_paths := os.environ.get("XDG_DATA_DIRS"):
         search_paths += [os.path.join(path, "gir-1.0") for path in data_paths.split(os.pathsep)]
 

docs/packaging.rst

@@ -21,17 +21,14 @@ Blueprint files can import GObject Introspection namespaces like this:
 To compile a blueprint file, ``.typelib`` files for all of the imported
 namespaces must be installed. All blueprint files must import Gtk 4.0, so
 ``Gtk-4.0.typelib`` is effectively a runtime dependency of blueprint-compiler.
+blueprint-compiler also depends on pygobject, because it uses GIRepository
+to determine the search path for typelib files.
 
 So, if a package uses blueprint-compiler, its build dependencies should include
 the typelib files for any namespaces imported in its blueprint files. (Note
 that many apps also have the same typelib files as runtime dependencies,
 separately from blueprint).
 
-The search path for typelib files is defined by the
-`libdir <https://mesonbuild.com/Builtin-options.html#directories>`_ that Meson
-uses. Additional paths may be passed at runtime through the ``GI_TYPELIB_PATH``
-environment variable.
-
 In addition, the blueprint language server uses ``.gir`` files to provide
 documentation on hover. Some distros package these files separately from the
 main package (e.g. in a ``-devel`` package). The language server will not crash