From b04f0cad43eb627fb4e970367062329e3331d9fe Mon Sep 17 00:00:00 2001
From: "Avi Halachmi (:avih)" <avihpit@yahoo.com>
Date: Thu, 14 Dec 2017 21:22:56 +0200
Subject: js: implement mp.options.read_options

---
 DOCS/man/javascript.rst       | 16 ++++++-------
 player/javascript/defaults.js | 52 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/DOCS/man/javascript.rst b/DOCS/man/javascript.rst
index cd553510eb..5b446cea69 100644
--- a/DOCS/man/javascript.rst
+++ b/DOCS/man/javascript.rst
@@ -27,16 +27,16 @@ otherwise, the documented Lua options, script directories, loading, etc apply to
 JavaScript files too.
 
 Script initialization and lifecycle is the same as with Lua, and most of the Lua
-functions at the modules ``mp``, ``mp.utils`` and ``mp.msg`` are available to
-JavaScript with identical APIs - including running commands, getting/setting
-properties, registering events/key-bindings/property-changes/hooks, etc.
+functions at the modules ``mp``, ``mp.utils``, ``mp.msg`` and ``mp.options`` are
+available to JavaScript with identical APIs - including running commands,
+getting/setting properties, registering events/key-bindings/hooks, etc.
 
 Differences from Lua
 --------------------
 
-No need to load modules. ``mp``, ``mp.utils`` and ``mp.msg`` are preloaded, and
-you can use e.g. ``var cwd = mp.utils.getcwd();`` without prior setup.
-``mp.options`` is currently not implemented, but ``mp.get_opt(...)`` is.
+No need to load modules. ``mp``, ``mp.utils``,  ``mp.msg`` and ``mp.options``
+are preloaded, and you can use e.g. ``var cwd = mp.utils.getcwd();`` without
+prior setup.
 
 Errors are slightly different. Where the Lua APIs return ``nil`` for error,
 the JavaScript ones return ``undefined``. Where Lua returns ``something, error``
@@ -87,8 +87,6 @@ Unsupported Lua APIs and their JS alternatives
 
 ``mp.dispatch_events([allow_wait])`` see event loop below.
 
-``mp.options`` module is not implemented currently for JS.
-
 Scripting APIs - identical to Lua
 ---------------------------------
 
@@ -184,6 +182,8 @@ Otherwise, where the Lua APIs return ``nil`` on error, JS returns ``undefined``.
 
 ``mp.add_hook(type, priority, fn)``
 
+``mp.options.read_options(obj [, identifier])`` (types: string/boolean/number)
+
 Additional utilities
 --------------------
 
diff --git a/player/javascript/defaults.js b/player/javascript/defaults.js
index 56c83f8abb..c5c1f35161 100644
--- a/player/javascript/defaults.js
+++ b/player/javascript/defaults.js
@@ -419,6 +419,58 @@ function new_require(base_id) {
 
 g.require = new_require(SCRIPTDIR_META + "/" + main_script[1]);
 
+/**********************************************************************
+ *  mp.options
+ *********************************************************************/
+function read_options(opts, id) {
+    id = String(typeof id != "undefined" ? id : mp.get_script_name());
+    mp.msg.debug("reading options for " + id);
+
+    var conf, fname = "~~/script-opts/" + id + ".conf";
+    try {
+        conf = mp.utils.read_file(fname);
+    } catch (e) {
+        mp.msg.verbose(fname + " not found.");
+    }
+
+    // data as config file lines array, or empty array
+    var data = conf ? conf.replace(/\r\n/g, "\n").split("\n") : [],
+        conf_len = data.length;  // before we append script-opts below
+
+    // Append relevant script-opts as <key-sans-id>=<value> to data
+    var sopts = mp.get_property_native("options/script-opts"),
+        prefix = id + "-";
+    for (var key in sopts) {
+        if (key.indexOf(prefix) == 0)
+            data.push(key.substring(prefix.length) + "=" + sopts[key]);
+    }
+
+    // Update opts from data
+    data.forEach(function(line, i) {
+        if (line[0] == "#" || line.trim() == "")
+            return;
+
+        var key = line.substring(0, line.indexOf("=")),
+            val = line.substring(line.indexOf("=") + 1),
+            type = typeof opts[key],
+            info = i < conf_len ? fname + ":" + (i + 1)  // 1-based line number
+                                : "script-opts:" + prefix + key;
+
+        if (!opts.hasOwnProperty(key))
+            mp.msg.warn(info, "Ignoring unknown key '" + key + "'");
+        else if (type == "string")
+            opts[key] = val;
+        else if (type == "boolean" && (val == "yes" || val == "no"))
+            opts[key] = (val == "yes");
+        else if (type == "number" && val.trim() != "" && !isNaN(val))
+            opts[key] = Number(val);
+        else
+            mp.msg.error(info, "Error: can't convert '" + val + "' to " + type);
+    });
+}
+
+mp.options = { read_options: read_options };
+
 /**********************************************************************
  *  various
  *********************************************************************/
-- 
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