setup.py: Install desktop file and icon on GNU/Linux/FreeBSD

MANIFEST.in

@@ -10,6 +10,8 @@ recursive-include Orange/canvas/application/tutorials *.ows
 recursive-include Orange/widgets *.png *.svg
 recursive-include Orange/widgets/utils/plot *.fs *.vs *.gs *.obj
 
+recursive-include distribute *.svg *.desktop
+
 include requirements*.txt
 
 include README.md

distribute/orange-canvas.desktop

@@ -1,11 +1,11 @@
 [Desktop Entry]
-Version=1.0
-Name=Orange Canvas
+Type=Application
+Name=Orange Data Mining
 GenericName=Data Mining Suite
-Comment=Explore and analyze your data
+Comment=Explore, analyze, and visualize your data
 Exec=orange-canvas
 Icon=orange-canvas
 Terminal=false
-Type=Application
-Categories=Education;Science;ArtificialIntelligence;DataVisualization;Qt;
-X-GNOME-FullName=Orange Canvas Data Mining Suite
+MimeType=application/x-extension-ows;
+Categories=Science;Education;ArtificialIntelligence;DataVisualization;NumericalAnalysis;Qt;
+Keywords=Machine Learning;Scientific Visualization;Statistical Analysis;

setup.py

@@ -216,6 +216,38 @@ def run(self):
         ''', shell=True, cwd=os.path.dirname(os.path.abspath(__file__))))
 
 
+# Install desktop file and icon on GNU/Linux/BSD
+DATA_FILES = []
+if any(sys.platform.startswith(platform)
+       for platform in ('linux', 'freebsd')):
+    # Patch desktop file executable to work with virtualenv
+    try:
+        sys.real_prefix
+    except AttributeError:
+        pass  # Not in virtualenv
+    else:
+        with open(os.path.join(os.path.dirname(__file__),
+                               'distribute',
+                               'orange-canvas.desktop'), 'r+') as desktop:
+            spec = []
+            for line in desktop:
+                if line.startswith('Exec='):
+                    line = 'Exec="{}" -m Orange.canvas\n'.format(sys.executable)
+                spec.append(line)
+            desktop.seek(0)
+            desktop.truncate(0)
+            desktop.writelines(spec)
+
+    usr_share = os.path.join(sys.prefix, "share")
+    if not usr_share.startswith('/usr/') or not os.access(usr_share, os.W_OK):
+        usr_share = os.environ.get('XDG_DATA_HOME',
+                                   os.path.expanduser('~/.local/share'))
+    DATA_FILES += [
+        (os.path.join(usr_share, 'applications'),
+         ['distribute/orange-canvas.desktop']),
+        (os.path.join(usr_share, 'icons', 'hicolor', 'scalable', 'apps'),
+         ['distribute/orange-canvas.svg'])
+    ]
 
 
 def setup_package():
@@ -235,6 +267,7 @@ def setup_package():
         package_data=PACKAGE_DATA,
         install_requires=INSTALL_REQUIRES,
         entry_points=ENTRY_POINTS,
+        data_files=DATA_FILES,
         zip_safe=False,
         test_suite='Orange.tests.test_suite',
         cmdclass={