[gui] Ability to install a desktop file shortcut

gui/cadbiom_gui/__main__.py

@@ -30,12 +30,53 @@ Created on Nov 2016
 
 ..sectionauthor:: Pierre Vignet <pierre.vignet@irisa.fr>
 """
+import sys
+import os
+import pkg_resources
+import gtk
+from cadbiom_gui.gt_gui.charter import Charter
+from cadbiom import commons as cm
 
-def main():
+LOGGER = cm.logger()
+
+
+def build_desktop_shortcut(executable_path):
+    """Install a .desktop launcher file in ~/.local/share/applications"""
+
+    if sys.platform != "linux2":
+        LOGGER.error("This option is only supported on GNU/Linux platforms.")
+        exit(1)
+
+    favicon_path = pkg_resources.resource_filename(
+        __name__, "gt_gui/images/favicon.ico"
+    )
+
+    desktop_content = """[Desktop Entry]
+Comment=Cadbiom GUI launcher
+Encoding=UTF-8
+Exec={}
+Icon={}
+Categories=Science;
+Name=Cadbiom
+Type=Application
+Terminal=false
+""".format(
+        executable_path, favicon_path
+    )
 
+    desktop_path = "%s/.local/share/applications/" % os.path.expanduser("~")
+    with open(desktop_path + "Cadbiom.desktop", "w") as f_d:
+        f_d.write(desktop_content)
+
+    LOGGER.info("Desktop file created in <%s>", desktop_path)
+    exit(0)
+
+
+def main():
     """Launch Cadbiom gui"""
-    import gtk
-    from cadbiom_gui.gt_gui.charter import Charter
+
+    if "--install_desktop_shortcut" in sys.argv:
+        build_desktop_shortcut(sys.argv[0])
 
     charter = Charter(None)
     charter.show()