libpeas@1.22.0: new package (#12385)

* libpeas@1.22.0: new package

* libpeas: note more build dependencies

Build and link dependencies were obtained through a combination of
examining the `config.log` file from `configure` and looking at the
pkg-config files of `libpeas`.

* libpeas: add search path for GIR/typelib files

var/spack/repos/builtin/packages/libpeas/package.py

@@ -0,0 +1,107 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+
+from spack import *
+import os
+
+
+class Libpeas(AutotoolsPackage):
+    """libpeas is a gobject-based plugins engine, and is targeted at
+    giving every application the chance to assume its own
+    extensibility."""
+
+    homepage = "http://developer.gnome.org/libpeas/stable"
+    url = 'https://download.gnome.org/sources/libpeas/1.22/libpeas-1.22.0.tar.xz'
+
+    version('1.22.0', sha256='5b2fc0f53962b25bca131a5ec0139e6fef8e254481b6e777975f7a1d2702a962')
+
+    depends_on('m4', type='build')
+    depends_on('autoconf', type='build')
+    depends_on('automake', type='build')
+    depends_on('libtool', type='build')
+    depends_on('gettext', type='build')
+    depends_on('pkg-config', type='build')
+    depends_on('atk')
+    depends_on('intltool@0.40.0:')
+    depends_on('xmlto', type='build')
+    depends_on('perl', type='build')
+    depends_on('perl-xml-parser', type='build')
+    depends_on('glib@2.10:')
+    depends_on('gobject-introspection')
+    depends_on('libffi')
+    depends_on('gtkplus')
+    depends_on('gdk-pixbuf')
+    depends_on('pango')
+    depends_on('gnome-common')
+    depends_on('py-pygobject@3:', type='build')
+    depends_on('python@3:', type='build')
+
+    def url_for_version(self, version):
+        url  = 'https://download.gnome.org/sources/libpeas/'
+        url += '{0}/libpeas-{1}.tar.xz'
+        return url.format(version.up_to(2), version)
+
+    def setup_dependent_environment(self, spack_env, run_env, dependent_spec):
+        spack_env.prepend_path("XDG_DATA_DIRS", self.prefix.share)
+        run_env.prepend_path("XDG_DATA_DIRS", self.prefix.share)
+
+    def setup_environment(self, spack_env, run_env):
+        # Let
+        #
+        # python = self.spec['python']
+        # prefix = python.prefix
+        # pyversion = python.version.up_to(2)
+        # python_lib_path = os.path.join(prefix, 'Frameworks',
+        #                                'Python.framework', 'Versions',
+        #                                pyversion)
+        #
+        # self.spec['python'].libs.ld_flags returns (on macOS)
+        # '-L{0} -lPython'.format(python_lib_path)
+        #
+        # e.g., for python@3.7.4 on macOS via Homebrew, python_lib_path is
+        # /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7
+        #
+        # This directory is correct for many purposes, but libpeas uses the
+        # link flag '-lpython{0}m'.format(pyversion) and does not use an
+        # appropriate -L flag to locate this library, so the correct -L flag
+        # must be appended to LDFLAGS. Furthermore, this library is not found
+        # in python_lib_path.  However, pkg-config returns the correct
+        # directory, so pkg-config is used to generate the correct paths for
+        # LDFLAGS.
+        pkg_config = which('pkg-config')
+        python_prefix = self.spec['python'].prefix.lib.pkgconfig
+        python_pc_file = os.path.join(python_prefix, 'python3.pc')
+        python_ldflags = pkg_config('--libs', python_pc_file, output=str)
+
+        spack_env.append_path('LDFLAGS',
+                              python_ldflags)
+        spack_env.prepend_path('XDG_DATA_DIRS', self.prefix.share)
+        run_env.prepend_path('XDG_DATA_DIRS', self.prefix.share)
+
+    def autoreconf(self, spec, prefix):
+        autoreconf_args = ['-ivf']
+        aclocal_pkg_list = ['pkg-config',
+                            'gettext',
+                            'intltool',
+                            'glib',
+                            'gobject-introspection',
+                            'gnome-common',
+                            'gtkplus']
+        aclocal_path = os.path.join('share', 'aclocal')
+
+        for pkg in aclocal_pkg_list:
+            autoreconf_args += ['-I',
+                                os.path.join(spec[pkg].prefix, aclocal_path)]
+
+        autoreconf = which('autoreconf')
+        autoreconf(*autoreconf_args)
+
+    def configure_args(self):
+        args = ['--disable-silent-rules',
+                '--enable-gtk',
+                '--enable-python3',
+                '--disable-python2']
+        return args