From 261548ff184926567a623e90df7954aeef842d59 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <koszko@koszko.org>
Date: Wed, 30 Jun 2021 12:28:05 +0200
Subject: emply an sh-based build system; make some changes to blocking

---
 background/storage.js | 654 +++++++++++++++++++++++++-------------------------
 1 file changed, 330 insertions(+), 324 deletions(-)

(limited to 'background/storage.js')

diff --git a/background/storage.js b/background/storage.js
index f3f08c9..48e4e52 100644
--- a/background/storage.js
+++ b/background/storage.js
@@ -5,390 +5,396 @@
  * Redistribution terms are gathered in the `copyright' file.
  */
 
-"use strict";
-
-(() => {
-    const TYPE_PREFIX = window.TYPE_PREFIX;
-    const TYPE_NAME = window.TYPE_NAME;
-    const list_prefixes = window.list_prefixes;
-    const make_lock = window.make_lock;
-    const lock = window.lock;
-    const unlock = window.unlock;
-    const make_once = window.make_once;
-    const browser = window.browser;
-    const is_chrome = window.is_chrome;
-
-    var exports = {};
-
-    /* We're yet to decide how to handle errors... */
-
-    /* Here are some basic wrappers for storage API functions */
-
-    async function get(key)
-    {
-	try {
-	    /* Fix for fact that Chrome does not use promises here */
-	    let promise = is_chrome ?
-		new Promise((resolve, reject) =>
-			    chrome.storage.local.get(key,
-						     val => resolve(val))) :
-		browser.storage.local.get(key);
-
-	    return (await promise)[key];
-	} catch (e) {
-	    console.log(e);
-	}
-    }
+/*
+ * IMPORTS_START
+ * IMPORT TYPE_PREFIX
+ * IMPORT TYPE_NAME
+ * IMPORT list_prefixes
+ * IMPORT make_lock
+ * IMPORT lock
+ * IMPORT unlock
+ * IMPORT make_once
+ * IMPORT browser
+ * IMPORT is_chrome
+ * IMPORTS_END
+ */
 
-    async function set(key, value)
-    {
-	try {
-	    return browser.storage.local.set({[key]: value});
-	} catch (e) {
-	    console.log(e);
-	}
-    }
+var exports = {};
 
-    async function setn(keys_and_values)
-    {
-	let obj = Object();
-	while (keys_and_values.length > 1) {
-	    let value = keys_and_values.pop();
-	    let key = keys_and_values.pop();
-	    obj[key] = value;
-	}
+/* We're yet to decide how to handle errors... */
 
-	try {
-	    return browser.storage.local.set(obj);
-	} catch (e) {
-	    console.log(e);
-	}
-    }
+/* Here are some basic wrappers for storage API functions */
 
-    async function set_var(name, value)
-    {
-	return set(TYPE_PREFIX.VAR + name, value);
-    }
+async function get(key)
+{
+    try {
+	/* Fix for fact that Chrome does not use promises here */
+	let promise = is_chrome ?
+	    new Promise((resolve, reject) =>
+			chrome.storage.local.get(key,
+						 val => resolve(val))) :
+	    browser.storage.local.get(key);
 
-    async function get_var(name)
-    {
-	return get(TYPE_PREFIX.VAR + name);
+	return (await promise)[key];
+    } catch (e) {
+	console.log(e);
+    }
+}
+
+async function set(key, value)
+{
+    try {
+	return browser.storage.local.set({[key]: value});
+    } catch (e) {
+	console.log(e);
+    }
+}
+
+async function setn(keys_and_values)
+{
+    let obj = Object();
+    while (keys_and_values.length > 1) {
+	let value = keys_and_values.pop();
+	let key = keys_and_values.pop();
+	obj[key] = value;
     }
 
-    /*
-     * A special case of persisted variable is one that contains list
-     * of items.
-     */
-
-    async function get_list_var(name)
-    {
-	let list = await get_var(name);
-
-	return list === undefined ? [] : list;
+    try {
+	return browser.storage.local.set(obj);
+    } catch (e) {
+	console.log(e);
     }
+}
 
-    /* We maintain in-memory copies of some stored lists. */
+async function set_var(name, value)
+{
+    return set(TYPE_PREFIX.VAR + name, value);
+}
 
-    async function list(prefix)
-    {
-	let name = TYPE_NAME[prefix] + "s"; /* Make plural. */
-	let map = new Map();
+async function get_var(name)
+{
+    return get(TYPE_PREFIX.VAR + name);
+}
 
-	for (let item of await get_list_var(name))
-	    map.set(item, await get(prefix + item));
+/*
+ * A special case of persisted variable is one that contains list
+ * of items.
+ */
 
-	return {map, prefix, name, listeners : new Set(), lock : make_lock()};
-    }
+async function get_list_var(name)
+{
+    let list = await get_var(name);
 
-    var pages;
-    var bags;
-    var scripts;
+    return list === undefined ? [] : list;
+}
 
-    var list_by_prefix = {};
+/* We maintain in-memory copies of some stored lists. */
 
-    async function init()
-    {
-	for (let prefix of list_prefixes)
-	    list_by_prefix[prefix] = await list(prefix);
+async function list(prefix)
+{
+    let name = TYPE_NAME[prefix] + "s"; /* Make plural. */
+    let map = new Map();
 
-	return exports;
-    }
+    for (let item of await get_list_var(name))
+	map.set(item, await get(prefix + item));
 
-    /*
-     * Facilitate listening to changes
-     */
+    return {map, prefix, name, listeners : new Set(), lock : make_lock()};
+}
 
-    exports.add_change_listener = function (cb, prefixes=list_prefixes)
-    {
-	if (typeof(prefixes) === "string")
-	    prefixes = [prefixes];
+var pages;
+var bags;
+var scripts;
 
-	for (let prefix of prefixes)
-	    list_by_prefix[prefix].listeners.add(cb);
-    }
+var list_by_prefix = {};
 
-    exports.remove_change_listener = function (cb, prefixes=list_prefixes)
-    {
-	if (typeof(prefixes) === "string")
-	    prefixes = [prefixes];
+async function init()
+{
+    for (let prefix of list_prefixes)
+	list_by_prefix[prefix] = await list(prefix);
 
-	for (let prefix of prefixes)
-	    list_by_prefix[prefix].listeners.delete(cb);
-    }
+    return exports;
+}
 
-    function broadcast_change(change, list)
-    {
-	for (let listener_callback of list.listeners)
-	    listener_callback(change);
-    }
+/*
+ * Facilitate listening to changes
+ */
 
-    /* Prepare some hepler functions to get elements of a list */
+exports.add_change_listener = function (cb, prefixes=list_prefixes)
+{
+    if (typeof(prefixes) === "string")
+	prefixes = [prefixes];
 
-    function list_items_it(list, with_values=false)
-    {
-	return with_values ? list.map.entries() : list.map.keys();
-    }
+    for (let prefix of prefixes)
+	list_by_prefix[prefix].listeners.add(cb);
+}
 
-    function list_entries_it(list)
-    {
-	return list_items_it(list, true);
-    }
+exports.remove_change_listener = function (cb, prefixes=list_prefixes)
+{
+    if (typeof(prefixes) === "string")
+	prefixes = [prefixes];
 
-    function list_items(list, with_values=false)
-    {
-	let array = [];
+    for (let prefix of prefixes)
+	list_by_prefix[prefix].listeners.delete(cb);
+}
 
-	for (let item of list_items_it(list, with_values))
-	    array.push(item);
+function broadcast_change(change, list)
+{
+    for (let listener_callback of list.listeners)
+	listener_callback(change);
+}
 
-	return array;
-    }
+/* Prepare some hepler functions to get elements of a list */
 
-    function list_entries(list)
-    {
-	return list_items(list, true);
-    }
+function list_items_it(list, with_values=false)
+{
+    return with_values ? list.map.entries() : list.map.keys();
+}
 
-    /*
-     * Below we make additional effort to update map of given kind of items
-     * every time an item is added/removed to keep everything coherent.
-     */
-    async function set_item(item, value, list)
-    {
-	await lock(list.lock);
-	let result = await _set_item(...arguments);
-	unlock(list.lock)
-	return result;
-    }
-    async function _set_item(item, value, list)
-    {
-	let key = list.prefix + item;
-	let old_val = list.map.get(item);
-	if (old_val === undefined) {
-	    let items = list_items(list);
-	    items.push(item);
-	    await setn([key, value, "_" + list.name, items]);
-	} else {
-	    await set(key, value);
-	}
+function list_entries_it(list)
+{
+    return list_items_it(list, true);
+}
 
-	list.map.set(item, value)
+function list_items(list, with_values=false)
+{
+    let array = [];
 
-	let change = {
-	    prefix : list.prefix,
-	    item,
-	    old_val,
-	    new_val : value
-	};
+    for (let item of list_items_it(list, with_values))
+	array.push(item);
 
-	broadcast_change(change, list);
+    return array;
+}
 
-	return old_val;
-    }
+function list_entries(list)
+{
+    return list_items(list, true);
+}
 
-    // TODO: The actual idea to set value to undefined is good - this way we can
-    //       also set a new list of items in the same API call. But such key
-    //       is still stored in the storage. We need to somehow remove it later.
-    //       For that, we're going to have to store 1 more list of each kind.
-    async function remove_item(item, list)
-    {
-	await lock(list.lock);
-	let result = await _remove_item(...arguments);
-	unlock(list.lock)
-	return result;
+/*
+ * Below we make additional effort to update map of given kind of items
+ * every time an item is added/removed to keep everything coherent.
+ */
+async function set_item(item, value, list)
+{
+    await lock(list.lock);
+    let result = await _set_item(...arguments);
+    unlock(list.lock)
+    return result;
+}
+async function _set_item(item, value, list)
+{
+    let key = list.prefix + item;
+    let old_val = list.map.get(item);
+    if (old_val === undefined) {
+	let items = list_items(list);
+	items.push(item);
+	await setn([key, value, "_" + list.name, items]);
+    } else {
+	await set(key, value);
     }
-    async function _remove_item(item, list)
-    {
-	let old_val = list.map.get(item);
+
+    list.map.set(item, value)
+
+    let change = {
+	prefix : list.prefix,
+	item,
+	old_val,
+	new_val : value
+    };
+
+    broadcast_change(change, list);
+
+    return old_val;
+}
+
+// TODO: The actual idea to set value to undefined is good - this way we can
+//       also set a new list of items in the same API call. But such key
+//       is still stored in the storage. We need to somehow remove it later.
+//       For that, we're going to have to store 1 more list of each kind.
+async function remove_item(item, list)
+{
+    await lock(list.lock);
+    let result = await _remove_item(...arguments);
+    unlock(list.lock)
+    return result;
+}
+async function _remove_item(item, list)
+{
+    let old_val = list.map.get(item);
+    if (old_val === undefined)
+	return;
+
+    let key = list.prefix + item;
+    let items = list_items(list);
+    let index = items.indexOf(item);
+    items.splice(index, 1);
+
+    await setn([key, undefined, "_" + list.name, items]);
+
+    list.map.delete(item);
+
+    let change = {
+	prefix : list.prefix,
+	item,
+	old_val,
+	new_val : undefined
+    };
+
+    broadcast_change(change, list);
+
+    return old_val;
+}
+
+// TODO: same as above applies here
+async function replace_item(old_item, new_item, list, new_val=undefined)
+{
+    await lock(list.lock);
+    let result = await _replace_item(...arguments);
+    unlock(list.lock)
+    return result;
+}
+async function _replace_item(old_item, new_item, list, new_val=undefined)
+{
+    let old_val = list.map.get(old_item);
+    if (new_val === undefined) {
 	if (old_val === undefined)
 	    return;
-
-	let key = list.prefix + item;
-	let items = list_items(list);
-	let index = items.indexOf(item);
-	items.splice(index, 1);
-
-	await setn([key, undefined, "_" + list.name, items]);
-
-	list.map.delete(item);
-
-	let change = {
-	    prefix : list.prefix,
-	    item,
-	    old_val,
-	    new_val : undefined
-	};
-
-	broadcast_change(change, list);
-
+	new_val = old_val
+    } else if (new_val === old_val && new_item === old_item) {
 	return old_val;
     }
 
-    // TODO: same as above applies here
-    async function replace_item(old_item, new_item, list, new_val=undefined)
-    {
-	await lock(list.lock);
-	let result = await _replace_item(...arguments);
-	unlock(list.lock)
-	return result;
+    if (old_item === new_item || old_val === undefined) {
+	await _set_item(new_item, new_val, list);
+	return old_val;
     }
-    async function _replace_item(old_item, new_item, list, new_val=undefined)
-    {
-	let old_val = list.map.get(old_item);
-	if (new_val === undefined) {
-	    if (old_val === undefined)
-		return;
-	    new_val = old_val
-	} else if (new_val === old_val && new_item === old_item) {
-	    return old_val;
-	}
 
-	if (old_item === new_item || old_val === undefined) {
-	    await _set_item(new_item, new_val, list);
-	    return old_val;
-	}
+    let new_key = list.prefix + new_item;
+    let old_key = list.prefix + old_item;
+    let items = list_items(list);
+    let index = items.indexOf(old_item);
+    items[index] = new_item;
+    await setn([old_key, undefined, new_key, new_val,
+		"_" + list.name, items]);
 
-	let new_key = list.prefix + new_item;
-	let old_key = list.prefix + old_item;
-	let items = list_items(list);
-	let index = items.indexOf(old_item);
-	items[index] = new_item;
-	await setn([old_key, undefined, new_key, new_val,
-		    "_" + list.name, items]);
+    list.map.delete(old_item);
 
-	list.map.delete(old_item);
+    let change = {
+	prefix : list.prefix,
+	item : old_item,
+	old_val,
+	new_val : undefined
+    };
 
-	let change = {
-	    prefix : list.prefix,
-	    item : old_item,
-	    old_val,
-	    new_val : undefined
-	};
+    broadcast_change(change, list);
 
-	broadcast_change(change, list);
+    list.map.set(new_item, new_val);
 
-	list.map.set(new_item, new_val);
+    change.item = new_item;
+    change.old_val = undefined;
+    change.new_val = new_val;
 
-	change.item = new_item;
-	change.old_val = undefined;
-	change.new_val = new_val;
+    broadcast_change(change, list);
 
-	broadcast_change(change, list);
-
-	return old_val;
-    }
+    return old_val;
+}
 
-    /*
-     * For scripts, item name is chosen by user, data should be
-     * an object containing:
-     * - script's url and hash or
-     * - script's text or
-     * - all three
-     */
-
-    /*
-     * For bags, item name is chosen by user, data is an array of 2-element
-     * arrays with type prefix and script/bag names.
-     */
-
-    /*
-     * For pages data argument is an object with properties `allow'
-     * and `components'. Item name is url.
-     */
-
-    exports.set = async function (prefix, item, data)
-    {
-	return set_item(item, data, list_by_prefix[prefix]);
-    }
+/*
+ * For scripts, item name is chosen by user, data should be
+ * an object containing:
+ * - script's url and hash or
+ * - script's text or
+ * - all three
+ */
 
-    exports.get = function (prefix, item)
-    {
-	return list_by_prefix[prefix].map.get(item);
-    }
+/*
+ * For bags, item name is chosen by user, data is an array of 2-element
+ * arrays with type prefix and script/bag names.
+ */
 
-    exports.remove = async function (prefix, item)
-    {
-	return remove_item(item, list_by_prefix[prefix]);
-    }
+/*
+ * For pages data argument is an object with properties `allow'
+ * and `components'. Item name is url.
+ */
 
-    exports.replace = async function (prefix, old_item, new_item,
-				      new_data=undefined)
-    {
-	return replace_item(old_item, new_item, list_by_prefix[prefix],
-			    new_data);
-    }
+exports.set = async function (prefix, item, data)
+{
+    return set_item(item, data, list_by_prefix[prefix]);
+}
+
+exports.get = function (prefix, item)
+{
+    return list_by_prefix[prefix].map.get(item);
+}
+
+exports.remove = async function (prefix, item)
+{
+    return remove_item(item, list_by_prefix[prefix]);
+}
+
+exports.replace = async function (prefix, old_item, new_item,
+				  new_data=undefined)
+{
+    return replace_item(old_item, new_item, list_by_prefix[prefix],
+			new_data);
+}
+
+exports.get_all_names = function (prefix)
+{
+    return list_items(list_by_prefix[prefix]);
+}
+
+exports.get_all_names_it = function (prefix)
+{
+    return list_items_it(list_by_prefix[prefix]);
+}
+
+exports.get_all = function (prefix)
+{
+    return list_entries(list_by_prefix[prefix]);
+}
+
+exports.get_all_it = function (prefix)
+{
+    return list_entries_it(list_by_prefix[prefix]);
+}
+
+/* Finally, a quick way to wipe all the data. */
+// TODO: maybe delete items in such order that none of them ever references
+// an already-deleted one?
+exports.clear = async function ()
+{
+    let lists = list_prefixes.map((p) => list_by_prefix[p]);
+
+    for (let list of lists)
+	await lock(list.lock);
 
-    exports.get_all_names = function (prefix)
-    {
-	return list_items(list_by_prefix[prefix]);
-    }
+    for (let list of lists) {
 
-    exports.get_all_names_it = function (prefix)
-    {
-	return list_items_it(list_by_prefix[prefix]);
-    }
+	let change = {
+	    prefix : list.prefix,
+	    new_val : undefined
+	};
 
-    exports.get_all = function (prefix)
-    {
-	return list_entries(list_by_prefix[prefix]);
-    }
+	for (let [item, val] of list_entries_it(list)) {
+	    change.item = item;
+	    change.old_val = val;
+	    broadcast_change(change, list);
+	}
 
-    exports.get_all_it = function (prefix)
-    {
-	return list_entries_it(list_by_prefix[prefix]);
+	list.map = new Map();
     }
 
-    /* Finally, a quick way to wipe all the data. */
-    // TODO: maybe delete items in such order that none of them ever references
-    // an already-deleted one?
-    exports.clear = async function ()
-    {
-	let lists = list_prefixes.map((p) => list_by_prefix[p]);
-
-	for (let list of lists)
-	    await lock(list.lock);
-
-	for (let list of lists) {
-
-	    let change = {
-		prefix : list.prefix,
-		new_val : undefined
-	    };
+    await browser.storage.local.clear();
 
-	    for (let [item, val] of list_entries_it(list)) {
-		change.item = item;
-		change.old_val = val;
-		broadcast_change(change, list);
-	    }
+    for (let list of lists)
+	unlock(list.lock);
+}
 
-	    list.map = new Map();
-	}
-
-	await browser.storage.local.clear();
+const get_storage = make_once(init);
 
-	for (let list of lists)
-	    unlock(list.lock);
-    }
-
-    window.get_storage = make_once(init);
-})();
+/*
+ * EXPORTS_START
+ * EXPORT get_storage
+ * EXPORTS_END
+ */
-- 
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