[Feature request] Add graphviz support

[ksn135]

Create a console commands to work with current graph using _dot_ (graphviz) binary.

# app/console dsm:graphviz:generate-dot article_state_machine
digraph G {
    new -> reviewed [label="review"];
    reviewed -> accepted [label="accept"];
    accepted -> published [label="publish"];
    new -> rejected [label="reject"];
    reviewed -> rejected [label="reject"];
    accepted -> rejected [label="reject"];
    published -> rejected [label="reject"];
}
# app/console dsm:graphviz:generate-image article_state_machine --type=png > 2.png

What do you think about it? (I could make a PR).

[K-Phoen]

A command would indeed be nice but the main generation code should live in yohang/Finite. I think that an issue/PR has been open but I don't know its status.

[ksn135]

yohang/Finite is not symfony bundle, AFAIK, so it doesn't have Command component in composer.json.
And the author ("yohang") probably will NOT agree with me to extend composer dependencies list.
The code is very simple. I wrote the similar code several years ago in my symfony 1.x approval plugin.
I hope you don't mind if I create a PR with command in your bundle. Please let me know.

[ksn135]

yohang/Finite#17

[K-Phoen]

I didn't explain myself correctly: this bundle would be in charge of creating a new command but the code responsible for the Graphviz instructions generation would be in Finite (and the command would just be a wrapper around it). As implemented in yohang/Finite#17.

Ideally I'd like to wait for yohang/Finite#17 to be merged and write a command integrating it.

[ksn135]

Well, ok.

[K-Phoen]

Btw, I'll probably ping yohang tomorrow to see if he wants help on Finite to speed things up a bit.

[K-Phoen]

As the PR yohang/Finite#17 is still not merged, I implemented myself this feature in this bundle.