Attempt to enable canceling when postprocess is triggered

Not yet working. A multi-threading approach,
where the process triggering gets its own thread
could be the solution.

gui/iow_esm_functions.py

@@ -27,6 +27,7 @@ class IowEsmFunctions:
             
         self.shell_cmd_thread = Thread()
         self.cancel_cmd = Event()
+        self.cmd_finished = Event()
         self.output = ""
         
     def start_execute_shell_cmd(self, cmd, printing, stop_event):
@@ -46,13 +47,21 @@ class IowEsmFunctions:
                 os.killpg(os.getpgid(p.pid), signal.SIGTERM)
                 self.gui.print("...canceled")
                 stop_event.clear()
+                self.mark_cmd_finished()
                 return
             
         if printing:
             self.gui.print("...done")
             
         self.output = str(p.stdout.read().decode("utf-8"))
+
+        self.mark_cmd_finished()
+        
         return 
+    
+    def mark_cmd_finished(self):
+        self.cmd_finished.set()
+        self.cmd_finished.clear()
         
     def execute_shell_cmd(self, cmd, printing = True, blocking = True):
         
@@ -61,6 +70,7 @@ class IowEsmFunctions:
         
         if blocking:
             self.start_execute_shell_cmd(cmd, printing, self.cancel_cmd)
+            self.mark_cmd_finished()
             return self.output
         
         if self.shell_cmd_thread.is_alive():
@@ -78,6 +88,7 @@ class IowEsmFunctions:
             self.gui.print("Warning: No command is running.")
             return 
         
+        self.gui.print("Canceling...")
         self.cancel_cmd.set()
                 
     def clone_origins(self):

gui/postprocess_window.py

@@ -8,6 +8,7 @@ from iow_esm_globals import *
 from iow_esm_buttons_and_labels import *
 from check_dependencies import get_dependency_ordered_groups
 import tkinter.ttk as ttk
+import time
 
 class PostprocessWindow():
     
@@ -255,7 +256,10 @@ class PostprocessWindow():
             if  self.current_from_dates[model] != "" and self.current_to_dates[model] != "":
                 cmd += " " + self.current_from_dates[model] + " " + self.current_to_dates[model]
             
-            self.master.functions.execute_shell_cmd(cmd, blocking = False)
+            self.master.functions.execute_shell_cmd(cmd, blocking = True)
+
+            #while not self.master.functions.cmd_finished.wait():
+            #    self.master.window.update_idletasks()
         
         return True