Feature/new archiving (#2335)

* Change archiving config page layout

I've changed some wording and moved actions into a
maintenance section.

* Update purge action

Now we have more control on the purge action. The configuration allows
us to choose what to keep and what to discard in a more precise way.
At the moment, the configuration applies for all feeds.

* Add purge configuration on feed level

Now the extend purge configuration is available on feed level.
It is stored as attributes and will be used in the purge action.

* Update purge action

Now the purge action uses the feed configuration if it exists and
defaults on user configuration if not.

* Add empty option in period list

* Fix configuration warnings

* Add archiving configuration on categories

See #2369

* Add user info back

* Add explanations in UI

* Fixes for SQLite + error + misc.

* Fix invalid feed reference

* Short array syntax

Only for new code, so far

* Fix prefix error

* Query performance, default values

Work in progress

* Fix default values and confirm before leaving

Form cancel and confirm changes before leaving were broken.
And start taking advantage of the short echo syntax `<?= ?>` as we have
moved to PHP 5.4+

* More work

* Tuning SQL

* Fix MariaDB + performance issue

* SQL performance

* Fix SQLite bug

* Fix some attributes JSON encoding bugs

Especially for SQLite export/import

* More uniform, fix bugs

More uniform between global, category, feed settings

* Drop special cases for old articles during refresh

Instead will use lastSeen date with the new archiving logic.
This was generating problems anyway
https://github.com/FreshRSS/FreshRSS/issues/2154

* Draft drop index keep_history

Not needed anymore

* MySQL typo

Now properly tested with MySQL, PostgreSQL, SQLite

* More work for legacy values

Important to avoid overriding user's preference and risking deleting
data erroneously

* Fix PHP 7.3 / 7.4 warnings

@aledeg "Trying to use values of type null, bool, int, float or resource
as an array (such as $null["key"]) will now generate a notice. "
https://php.net/migration74.incompatible

* Reintroduce min articles and take care of legacy parameters

* A few changes forgotten

* Draft of migration + DROP of feed.keep_history

* Fix several errors

And give up using const for SQL to allow multiple database types (and we
cannot redefine a const)

* Add keep_min to categories + factorise archiving logic

* Legacy fix

* Fix bug yield from

* Minor: Use JSON_UNESCAPED_SLASHE for attributes

And make more uniform

* Fix sign and missing variable

* Fine tune the logic

2 files changed, 48 insertions, 13 deletions

diff --git a/p/scripts/category.js b/p/scripts/category.js
index c01b1fdd7..c5d36e900 100644
--- a/p/scripts/category.js
+++ b/p/scripts/category.js
@@ -137,11 +137,34 @@ function init_draggable() {
 		};
 }
 
+function archiving() {
+	const slider = document.getElementById('slider');
+	slider.addEventListener('change', function (e) {
+		if (e.target.id === 'use_default_purge_options') {
+			slider.querySelectorAll('.archiving').forEach(function (element) {
+				element.hidden = e.target.checked;
+			});
+		}
+	});
+	slider.addEventListener('click', function (e) {
+		if (e.target.closest('button[type=reset]')) {
+			const archiving = document.getElementById('use_default_purge_options');
+			if (archiving) {
+				slider.querySelectorAll('.archiving').forEach(function (element) {
+					element.hidden = archiving.getAttribute('data-leave-validation') == 1;
+				});
+			}
+		}
+	});
+}
+
 if (document.readyState && document.readyState !== 'loading') {
 	init_draggable();
+	archiving();
 } else if (document.addEventListener) {
 	document.addEventListener('DOMContentLoaded', function () {
 		init_draggable();
+		archiving();
 	}, false);
 }
 // @license-end
diff --git a/p/scripts/extra.js b/p/scripts/extra.js
index bba2e8e2b..1fd8a19de 100644
--- a/p/scripts/extra.js
+++ b/p/scripts/extra.js
@@ -184,12 +184,32 @@ function init_slider_observers() {
 		};
 
 	closer.onclick = function (ev) {
-			closer.classList.remove('active');
-			slider.classList.remove('active');
-			return false;
+			if (data_leave_validation() || confirm(context.i18n.confirmation_default)) {
+				slider.querySelectorAll('form').forEach(function (f) { f.reset(); });
+				closer.classList.remove('active');
+				slider.classList.remove('active');
+				return true;
+			} else {
+				return false;
+			}
 		};
 }
 
+function data_leave_validation() {
+	const ds = document.querySelectorAll('[data-leave-validation]');
+	for (let i = ds.length - 1; i >= 0; i--) {
+		const input = ds[i];
+		if (input.type === 'checkbox' || input.type === 'radio') {
+			if (input.checked != input.getAttribute('data-leave-validation')) {
+				return false;
+			}
+		} else if (input.value != input.getAttribute('data-leave-validation')) {
+			return false;
+		}
+	}
+	return true;
+}
+
 function init_configuration_alert() {
 	window.onsubmit = function (e) {
 			window.hasSubmit = true;
@@ -198,16 +218,8 @@ function init_configuration_alert() {
 			if (window.hasSubmit) {
 				return;
 			}
-			const ds = document.querySelectorAll('[data-leave-validation]');
-			for (let i = ds.length - 1; i >= 0; i--) {
-				const input = ds[i];
-				if (input.type === 'checkbox' || input.type === 'radio') {
-					if (input.checked != input.getAttribute('data-leave-validation')) {
-						return false;
-					}
-				} else if (input.value != input.getAttribute('data-leave-validation')) {
-					return false;
-				}
+			if (!data_leave_validation()) {
+				return false;
 			}
 		};
 }