Added executable chack

docs/syntax.md

@@ -87,14 +87,7 @@ tweak:  # optional tweaking of .gv output
                  # on the connector that are to be shorted
 
   # shorts
-  shorts:
-    <name>:
-      pins: <pins>
-      color: <color>                  # optional
-      manufacturer: <manufacturer>    # optional
-      mpn: <mpn>                      # optional
-      description: <description>      # optional
-      type: <loop/internal>           # optional, default is internal
+  shorts: <List>
 ```
 
 ## Cable attributes

src/wireviz/DataClasses.py

@@ -18,7 +18,7 @@ MultilineHypertext = (
 Designator = PlainText  # Case insensitive unique name of connector or cable
 
 # Literal type aliases below are commented to avoid requiring python 3.8
-ConnectorMultiplier = PlainText  # = Literal['pincount', 'populated', 'unpopulated', 'shorts']
+ConnectorMultiplier = PlainText  # = Literal['pincount', 'populated', 'unpopulated']
 CableMultiplier = (
     PlainText  # = Literal['wirecount', 'terminations', 'length', 'total_length']
 )
@@ -207,18 +207,17 @@ class Connector:
             # hide pincount for simple (1 pin) connectors by default
             self.show_pincount = self.style != "simple"
 
-        # for loop in self.loops:
-        #     # TODO: allow using pin labels in addition to pin numbers, just like when defining regular connections
-        #     # TODO: include properties of wire used to create the loop
-        #     if len(loop) != 2:
-        #         raise Exception("Loops must be between exactly two pins!")
-        #     for pin in loop:
-        #         if pin not in self.pins:
-        #             raise Exception(
-        #                 f'Unknown loop pin "{pin}" for connector "{self.name}"!'
-        #             )
-        #         # Make sure loop connected pins are not hidden.
-        #         self.activate_pin(pin, None)
+        for loop in self.loops:
+            # TODO: allow using pin labels in addition to pin numbers, just like when defining regular connections
+            # TODO: include properties of wire used to create the loop
+            for loopName in loop:
+                for pin in loop[loopName]:
+                    if pin not in self.pins:
+                        raise Exception(
+                            f'Unknown loop pin "{pin}" for connector "{self.name}"!'
+                        )
+                    # Make sure loop connected pins are not hidden.
+                    self.activate_pin(pin, None)
 
         for i, item in enumerate(self.additional_components):
             if isinstance(item, dict):

src/wireviz/Harness.py

@@ -8,6 +8,7 @@ from itertools import zip_longest
 from pathlib import Path
 from typing import Any, List, Union
 from dataclasses import asdict
+from distutils.spawn import find_executable
 
 from graphviz import Graph
 
@@ -731,9 +732,13 @@ class Harness:
             
     # This renders the graph with gvpr and neato, this is needed to be able to draw the stright lines for the jumpers
     def graphRender(self, type, filename, graph):
-        graph.save(filename=f"{filename}_tmp.gv")
-        os.system(f"dot {filename}_tmp.gv | gvpr -q -cf pin2pin.gvpr | neato -n2 -T{type} -o {filename}.{type}")
-        os.remove(f"{filename}_tmp.gv") 
+        
+        if find_executable("dot") and find_executable("gvpr") and find_executable("neato"):
+            graph.save(filename=f"{filename}_tmp.gv")
+            os.system(f"dot {filename}_tmp.gv | gvpr -q -cf pin2pin.gvpr | neato -n2 -T{type} -o {filename}.{type}")
+            os.remove(f"{filename}_tmp.gv") 
+        else:    
+            graph.render(filename=filename) # old rendering methode, befor jumper implementations
 
     @property
     def graph(self):