Plugin installation

docs/docs/getting_started.md

@@ -84,10 +84,12 @@ In the `Project` tab:
 
 ## Install the module plugin
 
-In the `Plugin` tab, you can install the module plugin (ie. TWW plugin). Direct install using the `Install` button is currently not implemented.
+In the `Plugin` tab, you can install the module plugin (ie. TWW plugin). There are two possibilities:
 
-* Click `Copy ZIP to directory`
-* In QGIS > Extension > Install and manage extension > Install from ZIP
+1. Click `Install` and it will be installed in the current QGIS profile. Note: this is possible only if running oQtopus from QGIS.
+2. Click `Copy ZIP to directory`:
+   * You can copy the plugin zip file to a directory of your choice.
+   * Then in QGIS > Extension > Install and manage extension > Install from ZIP.
 
 
 ## oQtopus as a standalone python executable

oqtopus/gui/plugin_widget.py

@@ -13,7 +13,6 @@
 
 
 class PluginWidget(QWidget, DIALOG_UI):
-
     def __init__(self, parent=None):
         QWidget.__init__(self, parent)
         self.setupUi(self)
@@ -83,14 +82,29 @@ def __installClicked(self):
             QtUtils.setFontItalic(self.info_label, True)
             return
 
-        QMessageBox.warning(
-            self,
-            self.tr("Not implemented"),
-            self.tr(
-                'Installation is not implemented yet.\nAt the moment, you can only copy the plugin zip file to a directory and use "Install from ZIP" in QGIS.'
-            ),
-        )
-        return
+        try:
+            from pyplugin_installer import instance as plugin_installer_instance
+
+            installer = plugin_installer_instance()
+            installer.installFromZipFile(asset_plugin.package_zip)
+
+            return
+
+        except ImportError:
+            QMessageBox.warning(
+                self,
+                self.tr("Error"),
+                self.tr("Plugin installation is not possible when oQtopus is running standalone."),
+            )
+            return
+
+        except Exception as e:
+            QMessageBox.warning(
+                self,
+                self.tr("Error"),
+                self.tr("Plugin installation failed with an exception: {0}").format(str(e)),
+            )
+            return
 
     def __seeChangelogClicked(self):
         if self.__current_module_package is None: