Open graphviz .dot file in GraphvizFiddle in browser

GraphvizFiddle.py

#!/usr/bin/env python
""" view graphviz file """
# pylint: disable=C0103
import sys
import webbrowser
import urllib.parse
import time
if len(sys.argv)<3:
    print("Format: "+sys.argv[0]+" browser dotfile")
else:
    B=webbrowser.get(sys.argv[1])
    with open(sys.argv[2], encoding="utf-8") as f:
        s=urllib.parse.quote("".join(line for line in f))
        T=str(int(time.time()))
        B.open("https://stamm-wilbrandt.de/GraphvizFiddle/2.1.2/?"+T+"#"+s)

Opens specified graphviz .dot file in GraphvizFiddle of specified browser:

pi@raspberrypi5:~ $ GraphvizFiddle.py firefox figs/bellman-eg.dot G
pi@raspberrypi5:~ $ GraphvizFiddle.py chromium-browser figs/bellman-eg.dot 
Opening in existing browser session.
pi@raspberrypi5:~ $ 

pi@raspberrypi5:~ $ pylint /usr/local/bin/GraphvizFiddle.py 

--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

pi@raspberrypi5:~ $ 

After installing boost …

sudo apt install libboost-all-dev
sudo apt install libboost-doc

… there are some .dot examples:

pi@raspberrypi5:~ $ cp -r /usr/share/doc/libboost1.74-doc/examples/libs/graph/example .
pi@raspberrypi5:~ $ cd example/
pi@raspberrypi5:~/example $ ls figs/
cc-internet.dot  edge-connectivity.dot  scc.dot
dfs-example.dot  ospf-graph.dot         telephone-network.dot
pi@raspberrypi5:~/example $ 

New .dot files will be created by boost graph library examples as well:

pi@raspberrypi5:~/example $ g++ bellman-example.cpp -o bellman-example
pi@raspberrypi5:~/example $ ./bellman-example 
u:   2 v
v:   4 x
x:   7 z
y:  -2 u
z:   0 z
pi@raspberrypi5:~/example $ ls figs/bellman-eg.dot 
figs/bellman-eg.dot
pi@raspberrypi5:~/example $ GraphvizFiddle.py firefox figs/bellman-eg.dot 
pi@raspberrypi5:~/example $ 

Revision 2 changes GraphvizFiddle URL to version 2.1.2, allowing to specify layout engine.

This BGL (Boost Graph Library) demo computes coordinates for a straight line drawing:

pi@raspberrypi5:~/example $ g++ straight_line_drawing.cpp -o straight_line_drawing
pi@raspberrypi5:~/example $ ./straight_line_drawing 
The straight line drawing is: 
0 -> (0, 0)
1 -> (10, 0)
2 -> (5, 4)
3 -> (5, 5)
4 -> (2, 1)
5 -> (3, 2)
6 -> (4, 3)
Is a plane drawing.
pi@raspberrypi5:~/example $ 

These are the edges of the graph:

pi@raspberrypi5:~/example $ grep add_edge straight_line_drawing.cpp 
    add_edge(0, 1, g);
    add_edge(1, 2, g);
    add_edge(2, 3, g);
    add_edge(3, 0, g);
    add_edge(3, 4, g);
    add_edge(4, 5, g);
    add_edge(5, 6, g);
    add_edge(6, 3, g);
    add_edge(0, 4, g);
    add_edge(1, 3, g);
    add_edge(3, 5, g);
    add_edge(2, 6, g);
    add_edge(1, 4, g);
    add_edge(1, 5, g);
    add_edge(1, 6, g);
pi@raspberrypi5:~/example $ 

Currently handcompiled into neato layout engine graph (because neato allows to fixate positions, those from demo output):

pi@raspberrypi5:~/example $ cat figs/straight_line_drawing.dot 
graph {
  layout=neato;
  node [shape=none]
  0 [pos="0,0!"]
  1 [pos="10,0!"]
  2 [pos="5,4!"]
  3 [pos="5,5!"]
  4 [pos="2,1!"]
  5 [pos="3,2!"]
  6 [pos="4,3!"]
  0--1
  1--2
  2--3
  3--0
  3--4
  4--5
  5--6
  6--3
  0--4
  1--3
  3--5
  2--6
  1--4
  1--5
  1--6
}
pi@raspberrypi5:~/example $ 

Opening in browser:

pi@raspberrypi5:~/example $ GraphvizFiddle.py chromium-browser figs/straight_line_drawing.dot 
Opening in existing browser session.
pi@raspberrypi5:~/example $ 

GraphvizFiddle Share link

New gist "straight_line_graphviz.cpp" generates the complete graphviz graph as output:
https://gist.github.com/Hermann-SW/99d151a273d290ee0d843c79b2da26a8?permalink_comment_id=4985753#gistcomment-4985753

pi@raspberrypi5:~ $ ./straight_line_graphviz | head -5
graph {
  layout=neato
  node [shape=none]
  0 [pos="0,0!"]
  1 [pos="16,0!"]
pi@raspberrypi5:~ $ ./straight_line_graphviz | tail -3
  8--5
  9--6
}
pi@raspberrypi5:~ $ 

So now GraphvizFiddle.py is of real help and opens result directly in browser:

pi@raspberrypi5:~ $ GraphvizFiddle.py firefox <(./straight_line_graphviz)
pi@raspberrypi5:~ $ 

Revision 3 does use webbrowser module instead of os.system():

pi@raspberrypi5:~ $ pylint /usr/local/bin/GraphvizFiddle.py 

--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

pi@raspberrypi5:~ $