[pygobject] setup.py: Install the pkg-config file

[Christoph Reiter <creiter src gnome org>]

commit 06f981d83bb6f4b7d6043e9ee04277fcc2631d91
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Thu Jan 25 16:33:29 2018 +0100

    setup.py: Install the pkg-config file
    
    Skip installation when a wheel is built as it doesn't allow including
    absolute paths and the .pc does.
    
    Remove LIBFFI_PC as it's always the same.

 configure.ac        |  2 --
 pygobject-3.0.pc.in |  2 +-
 setup.py            | 85 +++++++++++++++++++++++++++++++++++++++++++++++++----
 3 files changed, 80 insertions(+), 9 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b2a8b9f9..37eb0c81 100644
--- a/configure.ac
+++ b/configure.ac
@@ -136,11 +136,9 @@ AC_SUBST([PYTHON_VALGRIND_SUPP])
 
 dnl libffi
 PKG_CHECK_MODULES(FFI, libffi >= libffi_required_version)
-LIBFFI_PC=libffi
 
 AC_SUBST(FFI_CFLAGS)
 AC_SUBST(FFI_LIBS)
-AC_SUBST(LIBFFI_PC)
 
 dnl gio
 PKG_CHECK_MODULES(GIO, gio-2.0 >= gio_required_version)
diff --git a/pygobject-3.0.pc.in b/pygobject-3.0.pc.in
index 3c7af011..c54bd451 100644
--- a/pygobject-3.0.pc.in
+++ b/pygobject-3.0.pc.in
@@ -13,7 +13,7 @@ pygobjectincludedir=${includedir}/pygobject-3.0
 Name: PyGObject
 Description: Python bindings for GObject
 Requires: gobject-2.0
-Requires.private: @LIBFFI_PC@
+Requires.private: libffi
 Version: @VERSION@
 Cflags: -I${pygobjectincludedir}
 
diff --git a/setup.py b/setup.py
index 552809a6..c4e893c9 100755
--- a/setup.py
+++ b/setup.py
@@ -16,12 +16,6 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 # USA
 
-"""
-ATTENTION DISTRO PACKAGERS: This is not a valid replacement for autotools.
-It does not install headers, pkgconfig files and does not support running
-tests. Its main use case atm is installation in virtualenvs and via pip.
-"""
-
 import io
 import os
 import re
@@ -619,6 +613,83 @@ class build_ext(du_build_ext):
         du_build_ext.run(self)
 
 
+class install_pkgconfig(Command):
+    description = "install .pc file"
+    user_options = []
+
+    def initialize_options(self):
+        self.install_base = None
+        self.install_platbase = None
+        self.install_data = None
+        self.compiler_type = None
+        self.outfiles = []
+
+    def finalize_options(self):
+        self.set_undefined_options(
+            'install',
+            ('install_base', 'install_base'),
+            ('install_data', 'install_data'),
+            ('install_platbase', 'install_platbase'),
+        )
+
+        self.set_undefined_options(
+            'build_ext',
+            ('compiler_type', 'compiler_type'),
+        )
+
+    def get_outputs(self):
+        return self.outfiles
+
+    def get_inputs(self):
+        return []
+
+    def run(self):
+        cmd = self.distribution.get_command_obj("bdist_wheel", create=False)
+        if cmd is not None:
+            log.warn(
+                "Python wheels and pkg-config is not compatible. "
+                "No pkg-config file will be included in the wheel. Install "
+                "from source if you need one.")
+            return
+
+        if self.compiler_type == "msvc":
+            return
+
+        script_dir = get_script_dir()
+        pkgconfig_in = os.path.join(script_dir, "pygobject-3.0.pc.in")
+        with io.open(pkgconfig_in, "r", encoding="utf-8") as h:
+            content = h.read()
+
+        config = {
+            "prefix": self.install_base,
+            "exec_prefix": self.install_platbase,
+            "includedir": "${prefix}/include",
+            "datarootdir": "${prefix}/share",
+            "datadir": "${datarootdir}",
+            "libdir": "",  # XXX: we don't know it, ignore for now..
+            "VERSION": self.distribution.get_version(),
+        }
+        for key, value in config.items():
+            content = content.replace("@%s@" % key, value)
+
+        pkgconfig_dir = os.path.join(self.install_data, "share", "pkgconfig")
+        self.mkpath(pkgconfig_dir)
+        target = os.path.join(pkgconfig_dir, "pygobject-3.0.pc")
+        with io.open(target, "w", encoding="utf-8") as h:
+            h.write(content)
+        self.outfiles.append(target)
+
+
+du_install = get_command_class("install")
+
+
+class install(du_install):
+
+    sub_commands = du_install.sub_commands + [
+        ("install_pkgconfig", lambda self: True),
+    ]
+
+
 def main():
     script_dir = get_script_dir()
     pkginfo = parse_pkg_info(script_dir)
@@ -674,6 +745,8 @@ def main():
             "build_tests": build_tests,
             "test": test,
             "quality": quality,
+            "install": install,
+            "install_pkgconfig": install_pkgconfig,
         },
         install_requires=[
             "pycairo>=%s" % get_version_requirement(