Add diagram direction support (#58)

[silwol]

Not quite sure whether the tinytemplate templates are formatted as expected, I tried to keep the output format identical when the parameter is absent, and just add a single line if it is present. That results in a somewhat strange template format, not sure what your preference is here.

Hope the PR suits in general, please let me know whether the general direction is ok or if you see room for improvement somewhere.

[kurotych]

Hello @silwol, I'm very grateful for your contribution.
Everything looks good overall. Please check the two comments, and we’ll be good to go.

[kurotych]

Let's have short values: tb, bt, lr, rl in cli parameters

[kurotych]

start if direction from new line, otherwise it produces white-spaces

static MERMAID_TEMPLATE: &str = r#"erDiagram
{{ if direction }}direction {direction}{{ endif }}
{{ for ent in entities}}{ent}{{ endfor }}
{{ for en in enums}}{en}{{ endfor }}
{{ for fk in foreign_keys}}{fk}{{ endfor }}
"#;

[silwol]

The whitespace was intentional, I thought an indentation is required for mermaid diagrams, maybe I'm wrong.

If I understand correctly, your proposal will create an empty line if no direction is passed in. That's what I tried to avoid with my approach. If this empty line and the "missing" indentation don't matter, we can go ahead with the proposal, which is what I pushed now.

[kurotych]

indentation is required for mermaid diagrams,

indentation is not required

your proposal will create an empty line if no direction is passed in. That's what I tried to avoid with my approach.

You are right. It looks better. I will return if statement to the top to avoid empty line in missing parameter case.

[silwol]

Thanks a lot for merging! 🚀

[kurotych]

Thanks a lot for merging! 🚀

Thank you for your contribution 👍