refactor(pkginfo): uniformize depends syntaxe with other projects

__pkginfo__.py

@@ -100,11 +100,11 @@
         )
     ]
 
-install_requires = [
-    "logilab-common >= 1.6.0",
-    "logilab-database >= 1.6.0",
-    "yapps2-logilab >= 2.2.1",
-    "logilab-constraint >= 0.5.0",  # fallback if the gecode compiled module is missing
-    'typing-extensions; python_version < "3.8"',
-    "setuptools",
-]
+__depends__ = {
+    "logilab-common": ">= 1.6.0",
+    "logilab-database": ">= 1.6.0",
+    "yapps2-logilab": ">= 2.2.1",
+    "logilab-constraint": ">= 0.5.0",  # fallback if the gecode compiled module is missing
+    'typing-extensions; python_version < "3.8"': None,
+    "setuptools": None,
+}

setup.py

@@ -37,6 +37,13 @@
 with open(osp.join(here, "README.rst"), encoding="utf-8") as f:
     long_description = f.read()
 
+requires = {}
+for entry in ("__depends__",):  # "__recommends__"):
+    requires.update(pkginfo.get(entry, {}))
+install_requires = [
+    "{0} {1}".format(d, v and v or "").strip() for d, v in requires.items()
+]
+
 if os.environ.get("RQL_FORCE_GECODE"):
     MyBuildExt = build_ext.build_ext
 else:
@@ -78,7 +85,7 @@
     classifiers=pkginfo.get("classifiers", []),
     packages=find_packages(exclude=["contrib", "docs", "test*"]),
     python_requires=">=3.7",
-    install_requires=pkginfo.get("install_requires"),
+    install_requires=install_requires,
     ext_modules=pkginfo.get("ext_modules"),
     cmdclass={"build_ext": MyBuildExt},
 )