qtplasmac: allow python scripts from user buttons

Author: phillc54

docs/src/plasma/qtplasmac.adoc

@@ -3061,6 +3061,7 @@ n Name = PIERCE\&&CUT
 Buttons can run the following:
 
 . <<qt_button-cmds,External commands>>
+. <<qt_button-py,External python scripts>>
 . <<qt_button-code,G-code commands>>
 . <<qt_button-toggle,Toggle a HAL pin>>
 . <<qt_button-laser,Toggle the alignment laser HAL pin>>
@@ -3087,6 +3088,17 @@ To run an external command, the command is preceded by a % character.
 n Code = %halshow
 ----
 
+[[qt_button-py]]
+[underline]*External Python Scripts*
+
+To run an external python script, the script name is preceded by a % character and it also requires a .py extension.
+It is valid to use the ~ character as a shortcut for the users home directory.
+
+[source,{ini}]
+----
+n Code = %my_python_script.py
+----
+
 [[qt_button-code]]
 [underline]*G-code*
 

share/qtvcp/screens/qtplasmac/qtplasmac_handler.py

@@ -1,4 +1,4 @@
-VERSION = '1.233.246'
+VERSION = '1.233.247'
 
 '''
 qtplasmac_handler.py
@@ -3482,7 +3482,10 @@ def user_button_setup(self):
                             self.idleHomedList.append('button_{}'.format(str(bNum)))
                     elif command and command[0] == '%':
                         cmd = command.lstrip('%').lstrip(' ').split(' ', 1)[0]
-                        reply = Popen('which {}'.format(cmd), stdout=PIPE, stderr=PIPE, shell=True).communicate()[0]
+                        if cmd[-3:] == '.py':
+                            reply = os.path.exists(os.path.expanduser(cmd))
+                        else:
+                            reply = Popen('which {}'.format(cmd), stdout=PIPE, stderr=PIPE, shell=True).communicate()[0]
                         if not reply:
                             head = _translate('HandlerClass', 'External Code Error')
                             msg1 = _translate('HandlerClass', 'External command')
@@ -3640,8 +3643,13 @@ def user_button_command(self, bNum, command):
                 command = newCommand
             ACTION.CALL_MDI(command)
         elif command and command[0] == '%':
-            command = command.lstrip('%').lstrip() + '&'
-            Popen(command, stdout=PIPE, stderr=PIPE, shell=True)
+            command = command.lstrip('%').lstrip()
+            if command[-3:] == '.py':
+                cmd = 'python3 ' + command
+                Popen(cmd, stdin = None, stdout=PIPE, stderr=PIPE, shell=True)
+            else:
+                command += '&'
+                Popen(command, stdout=PIPE, stderr=PIPE, shell=True)
         else:
             head = _translate('HandlerClass', 'Code Error')
             msg0 = _translate('HandlerClass', 'Invalid code for user button')

share/qtvcp/screens/qtplasmac/versions.html

@@ -30,6 +30,11 @@ <h2>QtPlasmaC Version History</h2>
 </table>
 <br>
 <!--- ****** ADD NEXT VERSION BELOW THIS LINE ****** --->
+<br><b><u>v1.233.247 2022 Oct 09</u></b>
+<ul style="margin:0;">
+  <li>allow python scripts from user buttons</li>
+</ul>
+
 <br><b><u>v1.233.246 2022 Sep 22</u></b>
 <ul style="margin:0;">
   <li>rework void sensing</li>