Integrate host commands in pronsole and pronterface (#428)

Any host command (other than pause) will now be run as a pronsole
command. This will allow doing things such as #428 easily.

printrun/pronsole.py

@@ -445,6 +445,7 @@ class pronsole(cmd.Cmd):
         self.p.startcb = self.startcb
         self.p.endcb = self.endcb
         self.p.layerchangecb = self.layer_change_cb
+        self.p.process_host_command = self.process_host_command
         self.recvlisteners = []
         self.in_macro = False
         self.p.onlinecb = self.online
@@ -1636,6 +1637,14 @@ class pronsole(cmd.Cmd):
     def help_off(self):
         self.log(_("Turns off everything on the printer"))
 
+    def process_host_command(self, command):
+        """Override host command handling"""
+        command = command.lstrip()
+        if command.startswith(";@"):
+            command = command[2:]
+            self.log(_("G-Code calling host command \"%s\"") % command)
+            self.onecmd(command)
+
     def add_cmdline_arguments(self, parser):
         parser.add_argument('-c', '--conf', '--config', help = _("load this file on startup instead of .pronsolerc ; you may chain config files, if so settings auto-save will use the last specified file"), action = "append", default = [])
         parser.add_argument('-e', '--execute', help = _("executes command after configuration/.pronsolerc is loaded ; macros/settings from these commands are not autosaved"), action = "append", default = [])

printrun/pronterface.py

@@ -177,9 +177,6 @@ class PronterWindow(MainWindow, pronsole.pronsole):
         self.p.xy_feedrate = self.settings.xy_feedrate
         self.p.z_feedrate = self.settings.z_feedrate
 
-        #make printcore aware of me
-        self.p.pronterface = self
-
         self.panel.SetBackgroundColour(self.settings.bgcolor)
         customdict = {}
         try:
@@ -1391,6 +1388,14 @@ Printrun. If not, see <http://www.gnu.org/licenses/>."""
     ## Printcore callbacks
     ## --------------------------------------------------------------
 
+    def process_host_command(self, command):
+        """Override host command handling"""
+        command = command.lstrip()
+        if command.startswith(";@pause"):
+            self.pause(None)
+        else:
+            pronsole.pronsole.process_host_command(self, command)
+
     def startcb(self, resuming = False):
         """Callback on print start"""
         pronsole.pronsole.startcb(self, resuming)