Add File | Save network (#14)

Signed-off-by: Damien Jeandemange <damien.jeandemange@gmail.com>

README.md

@@ -11,10 +11,11 @@
 
 YAGAT provides a graphical user interface built on top of the [PowSyBl](https://www.powsybl.org) open source grid analysis libraries.
 
-With YAGAT no computer science skill is required: just download the application and run it.
+With YAGAT, no programming skills are required: just download, unzip, and run – you're all set!
 
 Today with YAGAT you can:
 - Load grid models from the various formats supported by [PowSyBl](https://www.powsybl.org):
+  - PowSyBl native iIDM format
   - CIM/CGMES
   - UCTE-DEF
   - IEEE-CDF
@@ -25,13 +26,20 @@ Today with YAGAT you can:
 
 ## Installation
 
-### Binary releases
-
 Binary releases are provided for Windows, Linux and macOS on the [releases page](https://github.com/jeandemanged/yagat/releases).  
 No additional software is required for installation.  
 Download and extract the zip archive for your platform, then run YAGAT.
 
-### Building from source
+## Quick Start
+
+- **Open a sample network**: Go to `File` | `Open Sample network` | `IEEE 9 Bus` to load a sample grid model.
+- **Navigate the grid**: Use the tree view on the left to browse through the network model and its elements.
+- **Run the Load Flow**: Select `Run` | `Load Flow` to execute the analysis.
+  - Once completed, review the solved bus voltages and branch flows.
+
+![yagat quickstart](https://github.com/user-attachments/assets/a5ef2a20-13a8-44f5-b927-8d090d173d73)
+
+## Building from source
 
 With Python 3.12 and e.g. using a Virtual Environment and `pip`.
 
@@ -55,15 +63,6 @@ pyinstaller -y yagat.spec
 
 YAGAT is then available for your platform in the `dist` directory.
 
-## Quick Start
-
-- **Open a sample network**: Go to `File` | `Open Sample network` | `IEEE 9 Bus` to load a sample grid model.
-- **Navigate the grid**: Use the tree view on the left to browse through the network model and its elements.
-- **Run the Load Flow**: Select `Run` | `Load Flow` to execute the analysis.
-  - Once completed, view the solved bus voltages and branch flows for insights into the grid's state.
-
-![yagat quickstart](https://github.com/user-attachments/assets/57aad269-4e02-4a34-aba7-2c7906ab0e26)
-
 ## Roadmap
 
 YAGAT today lacks many features, but you may already find it useful. What is planned for the future is:

yagat/menus/impl/file.py

@@ -14,7 +14,6 @@
 from yagat.app_context import AppContext
 
 
-
 class FileMenu(tk.Menu):
     def __init__(self, parent, context: AppContext, *args, **kwargs):
         tk.Menu.__init__(self, parent, *args, **kwargs)
@@ -43,7 +42,6 @@ def load_be_nl():
             context.network = be
             context.status_text = 'Network CGMES MicroGrid BE+NL loaded'
 
-
         self.sample_networks_menu.add_command(label='IEEE 9 Bus',
                                               command=lambda: load_sample_network(pn.create_ieee9()))
         self.sample_networks_menu.add_command(label='IEEE 14 Bus',
@@ -76,6 +74,8 @@ def load_be_nl():
                                               command=lambda: load_sample_network(
                                                   pn.create_four_substations_node_breaker_network_with_extensions()))
 
+        self.add_separator()
+        self.add_command(label='Save...', command=self.save_network)
         self.add_separator()
         self.add_command(
             label='Exit',
@@ -90,4 +90,15 @@ def open_network(self):
         else:
             self.context.status_text = 'Opening ' + filename
             self.context.network = pp.network.load(filename)
-            self.context.status_text = 'Network ' + self.context.network.name + ' loaded'
+            self.context.status_text = f'Network {self.context.network.name} loaded'
+
+    def save_network(self):
+        if not self.context.network:
+            return
+        filename = fd.asksaveasfilename()
+        if not filename:
+            self.context.status_text = 'File save cancelled by user'
+        else:
+            self.context.status_text = 'Saving ' + filename
+            self.context.network.save(filename)
+            self.context.status_text = f'Network {self.context.network.name} saved to {filename}'