Adding datastore2json & json2datastore scripts

[Lucas-C]

This is a follow-up on a previous PR: #1823

I made sure that the script works with the latest version of Shaarli,
and added the "inverse" script, that convert from JSON to a datastore.php file.

Usage:

composer datastore2json > datastore.json
composer json2datastore datastore.json > data/datastore.php

Or:

php -f datastore2json > datastore.json
php -f json2datastore datastore.json > data/datastore.json

[Lucas-C]

To give some context, in my usage of Shaarli, those scripts serve as a base to perform several operations on all my bookmarks:

• remove a tag from all bookmarks
• replace a tag by one or several others in all bookmarks
• perform a regex-based substitution in the descriptions of all bookmarks

[SansGuidon]

This would be awesome.

[nodiscc]

@Lucas-C sorry for the delay
I don't really want to maintain this in the main shaarli repository
If these scripts work, would you like to maintain them in your own repository?
Then we could link it from https://shaarli.readthedocs.io/en/master/Community-and-related-software.html

[Lucas-C]

@Lucas-C sorry for the delay I don't really want to maintain this in the main shaarli repository If these scripts work, would you like to maintain them in your own repository? Then we could link it from https://shaarli.readthedocs.io/en/master/Community-and-related-software.html

Alright, I will do that and submit a PR to add my repo to this list 👍

[Lucas-C]

On second thought: 2 changes to Shaarli application code are made in this PR in order for the json2datastore & json2datastore scripts to work: would you be open to adopt them in Shaarli code base?
They allow for easy JSON serialization of Shaarli links.

There are required for the json2datastore & json2datastore scripts to work.
And those changes cannot be "outsourced" to a distinct repository.

If you agree, I'll reduce the scope of this PR to just the changes to the application/bookmark/Bookmark.php & application/bookmark/BookmarkArray.php files.

[Lucas-C]

For now I initialized https://github.com/Lucas-C/shaarli-scripts

I'll wait for an answer here, and this PR to be merged, before fully testing the "externalized" datastore2json & json2datastore scripts, and submitting this repo onto https://shaarli.readthedocs.io/en/master/Community-and-related-software.html