[ot-calendar] Remodelling of the calendar toolkit

[rodibozman]

The focus here is on src/widgets/ot_calendar.eliom and src/widgets/ot_calendar.eliomi files.

Main visible changes

• Possibility to change the month via a selector
• Possibility to change the year via a selector as well
• When there is a period restriction the days that are not in the period are displayed differently and are not clickable anymore.

Internal changes

• Period restriction type added in order to have a customizable calendar.
• Refactoring of the way the handlers were written in the file in order to avoid redundancies
• Selectors added for months and years
• Handlers added for months and years thanks to the (very) helpful React module.

Test

In order to be able to test the changes, a very simple way to do is :

• Clone this repository on your computer and pin (via opam : opam pin add --kind path "your_path_to_this_repository") the repository as the new ocaml-toolkit library
• Download the ocsigen-start (via : eliom-distillery -name ocstart -template os.pgocaml) repository since it has a calendar demonstration
• Reinstall the ocaml-toolkit (still via opam : opam reinstall ocaml-toolkit)
• The only thing left to do is to execute the program inside the ocsigen-start repository and see the changes in your favorite browser.

[balat]

Can you change the opam file to increment version number? If current version is x.y.z change x if you break compatibility change y otherwise (new feature ...)

[rodibozman]

It is done @balat