feature #24705 [Workflow] Add PlantUML dumper to workflow:dump command (Plopix)
feature #24705 [Workflow] Add PlantUML dumper to workflow:dump command (Plopix)

This PR was merged into the 4.1-dev branch.

Discussion
----------

[Workflow] Add PlantUML dumper to workflow:dump command

| Q             | A
| ------------- | ---
| Branch        | 4.1
| Bug fix       | no
| New feature   | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT
| Doc PR        | Will do depending on the comments about that PR

Hello,

`workflow:dump` exports workflows in `dot` format. To me, this format is not the easiest and not the simplest to use. Styles and logic are mixed together which makes it hard to read.

[PlantUML](http://plantuml.com/) is a tool based on Graphviz like Dot but that
generates nicer diagrams, more readable and most of all easier to adapt to your
documentation. Just copy and paste the PUML on the website you will see the rendering live.

Also, there is a [PHPStorm Plugin](https://plugins.jetbrains.com/plugin/7017-plantuml-integration) and [plenty of integration](http://plantuml.com/running) of this format.

This PR adds 2 options

* a `--dump-format=puml` option to the `workflow:dump` command to generate the workflows in PlantUML.

* a `--puml-transition-format=square|arrow` option to the `workflow:dump` command to generate the workflows in PlantUML using a square shape or arrow for the transition. (see below)

The conversion requires the PlantUML JAR, and can be used like that:
```bash
php bin/console workflow:dump pull_request --dump-format=puml | java -jar plantuml.jar -p  > workflow.png
```
> don't forget the `-p` to enable the "piping"

Here is an example with `pull_request` workflow of the documentation (with no style and no marking):
```
@startuml
title pull_request
state start <<initial>>
state coding
state travis
state review
state merged
state closed
start --> travis: submit
coding --> travis: update
travis --> travis: update
review --> travis: update
travis --> review: wait_for_review
review --> coding: request_change
review --> merged: accept
review --> closed: reject
closed --> review: reopen
@enduml
```

As PlantUML let us define styles, I have provided some by default that the user can override.
Adding some marking:
```bash
php bin/console workflow:dump pull_request travis review --dump-format=puml
```
will give us:

```
@startuml
sprite $sf_logo [81x20/16z] {
hPNRaYiX24K1xwBo_tyx6-qaCtDEJ-KXLYMTLbp0HWcHZr3KRDJ8z94HG3jZn4_mijbQ2ryJoFePtXLWA_qxyGy19DpdY_10z11ZAbGjFHRwcEbcKx5-wqsV
yIMo8StMCHKh8ZUxnEwrZiwRAUOvy1lLcPQF4lEFAjhzMd5WOAqvKflS0Enx8PbihiSYXM8ClGVAseIWTAjCgVSAcnYbQG79xKFsZ0VnDCNc7AVBoPSMcTsX
UnrujbYjjz0NnsObkTgnmolqJD4QgGUYTQiNe8eIjtx4b6Vv8nPGpncn3NJ8Geo9W9VW2wGACm_JzgIO8A8KXr2jUBCVGEAAJSZ6JUlsNnmOzmIYti9G7bjL
8InaHM9G40NkwTG7OxrggvNIejA8AZuqyWjOzTIKi-wwYvjeHYesSWuPiTGDN5THzkYLU4MD5r2_0PDhG7LIUG33z5HtM6CP3icyWEVOS61sD_2ZsBfJdbVA
qM53XHDUwhY0TAwPug3OG9NonRFhO8ynF3I4unuAMDHmSrXH57V1RGvl9jafuZF9ZhqjWOEh98y0tUYGsUxkBSllIyBdT2oM5Fn2-ut-fzsq_cQNuL6Uvwqr
knh4RrvOKzxZfLV3s0rs_R_1SdYt3VxeQ1_y2_W2
}
title pull_request
skinparam titleBorderRoundCorner 15
skinparam titleBorderThickness 2
skinparam state {
    BackgroundColor<<initial>> #87b741
    BackgroundColor<<marked>> #3887C6
    BorderColor #3887C6
    BorderColor<<marked>> Black
    FontColor<<marked>> White
}
state start <<initial>>
state coding
state travis <<marked>>
state review <<marked>>
state merged
state closed
start --> travis: submit
coding --> travis: update
travis --> travis: update
review --> travis: update
travis --> review: wait_for_review
review --> coding: request_change
review --> merged: accept
review --> closed: reject
closed --> review: reopen
footer \nGenerated by <$sf_logo> **Workflow Component** and **PlantUML**
@enduml
```

Which gives you that:
![workflow](https://user-images.githubusercontent.com/313532/32086584-253e39c0-ba8b-11e7-82c7-fa24309dbcd6.png)

With `square` as transition, it gives you that:
![workflow](https://user-images.githubusercontent.com/313532/32533123-a8ea4530-c403-11e7-8f88-4f18d5e23a28.png)

Hope you will find that interesting!

Commits
-------

1497d36cab Add option to the workflow:dump command to allow PlantUML format dump

symfony/framework-bundle