Began adding support code for close-tab (#93)

tabfern/js/asq-helpers.js

@@ -72,7 +72,38 @@
         let chrcbk = module.CCgo(seq);
         do_right_now(chrcbk);
         return seq;
-    } //ASQ.NOW()
+    } //ASQ.NowCC()
+
+    /// Take action on this tick, and kick off a sequence based on a Chrome
+    /// callback, as if called with ASQ.try.
+    /// @param do_right_now {function} Called as do_right_now(chrome_cbk).
+    ///                                 Should cause chrome_cbk to be invoked
+    ///                                 when the sequence should proceed.
+    /// @return A sequence to chain off.
+    module.NowCCTry = function(do_right_now) {
+        // Inner sequence that provides the Chrome callback and the
+        // try/catch functionality
+        let inner_seq = ASQ();
+        let inner_chrcbk = module.CCgo(inner_seq);
+
+        // Outer sequence that we will return
+        let outer_seq = ASQ().duplicate();  //paused
+
+        // When inner_seq finishes, run outer_seq.  There must be a
+        // better way to do this, but I don't know what it is.  You can't
+        // put a .then() after a .or(), as far as I know.
+        inner_seq.val((...args)=>{
+            outer_seq.unpause(...args);
+        })
+        .or((failure)=>{    // like ASQ().try()
+            outer_seq.unpause( { 'catch': failure } );
+        });
+
+        // Kick it off
+        do_right_now(inner_chrcbk);
+
+        return outer_seq;
+    } //ASQ.NowCCTry()
 
     /// Check for an asynquence-contrib try() error return
     module.is_asq_try_err = function(o)

tabfern/src/view/tree.js

@@ -645,6 +645,33 @@ function actionEditBullet(node_id, node, unused_action_id, unused_action_el)
     saveTree();
 } //actionEditBullet
 
+/// Delete a tab's entry in the tree.
+/// @param node_id {string} the ID of the node to delete
+/// @param node the node to delete
+/// @param evt {Event} (optional) If truthy, the event that triggered the action
+/// @param is_internal {Boolean} (optional) If truthy, this is an internal
+///                              action, so don't prompt for confirmation.
+function actionDeleteTab(node_id, node, unused_action_id, unused_action_el,
+                            evt, is_internal)
+{
+    let tab_val = D.tabs.by_node_id(node_id);
+    if(!tab_val || !tab_val.tab_id) return;
+
+    // TODO RESUME HERE
+//    ASQH.NowCCTry((cc)=>{
+//        chrome.tabs.remove(tab_val.tab_id, cc)
+//    })
+//    .then((done_or_err)=>{
+//        // Check if the tab still exists.  If it had a beforeunload and
+//        // the user hit "Stay", it will still be there.
+//        // Even if there is a beforeunload popup, it appears that
+//        // chrome.runtime.lastError does not show any error.  Therefore,
+//        // we cannot rely on the error state to tell us whether the tab
+//        // is actually closed.
+//    });
+
+} //actionDeleteTab
+
 ////////////////////////////////////////////////////////////////////////// }}}1
 // Tree-node creation // {{{1