[nautilus] nautilus-extension: use Meson to generate pkgconfig file

[Ernestas Kulik <ernestask src gnome org>]

commit 2128efccae664ba12a870deb1720a08e58954dd2
Author: Ernestas Kulik <ernestask gnome org>
Date:   Tue Jan 30 20:30:10 2018 +0200

    nautilus-extension: use Meson to generate pkgconfig file
    
    Currently, the pkgconfig file for nautilus-extension is generated by
    substituting variables in a template file. That is prone to mistakes and
    requires manual tracking of dependencies. Using the pkgconfig module
    from Meson helps automate much of the process.

 .../libnautilus-extension-uninstalled.pc.in        | 12 --------
 libnautilus-extension/libnautilus-extension.pc.in  | 12 --------
 libnautilus-extension/meson.build                  | 34 +++++++++++++---------
 meson.build                                        |  1 +
 4 files changed, 21 insertions(+), 38 deletions(-)
---
diff --git a/libnautilus-extension/meson.build b/libnautilus-extension/meson.build
index 0f63f9bf8..99dc4309e 100644
--- a/libnautilus-extension/meson.build
+++ b/libnautilus-extension/meson.build
@@ -70,18 +70,24 @@ nautilus_extension = declare_dependency(
   include_directories: nautilus_include_dirs
 )
 
-pkgconfig_data = configuration_data()
-
-pkgconfig_data.set('prefix', prefix)
-pkgconfig_data.set('exec_prefix', '${prefix}')
-pkgconfig_data.set('libdir', join_paths('${exec_prefix}', libdir))
-pkgconfig_data.set('includedir', join_paths('${prefix}', includedir))
-pkgconfig_data.set('extensiondir', join_paths('${exec_prefix}', extensiondir))
-pkgconfig_data.set('VERSION', meson.project_version())
-
-configure_file(
-  input: 'libnautilus-extension.pc.in',
-  output: 'libnautilus-extension.pc',
-  configuration: pkgconfig_data,
-  install_dir: join_paths(libdir, 'pkgconfig')
+pkgconfig.generate(
+  description: 'A library to create Nautilus view extensions',
+  filebase: 'libnautilus-extension',
+  libraries: [
+    libnautilus_extension
+  ],
+  name: 'libnautilus-extension',
+  subdirs: [
+    'nautilus'
+  ],
+  requires: [
+    'gio-2.0',
+    'glib-2.0',
+    'gtk+-3.0'
+  ],
+  variables: [
+    'exec_prefix=${prefix}',
+    'extensiondir=${libdir}/nautilus/extensions-3.0'
+  ],
+  version: meson.project_version()
 )
diff --git a/meson.build b/meson.build
index 290b302fa..33b37dc9c 100644
--- a/meson.build
+++ b/meson.build
@@ -24,6 +24,7 @@ cc = meson.get_compiler('c')
 # Imports
 gnome = import('gnome')
 i18n = import('i18n')
+pkgconfig = import('pkgconfig')
 #
 
 # Dependencies