improve item list styling; add payload creation form; exend dialog mechanism

2 files changed, 14 insertions, 3 deletions

diff --git a/common/indexeddb.js b/common/indexeddb.js
index f9c407a..a18c9be 100644
--- a/common/indexeddb.js
+++ b/common/indexeddb.js
@@ -313,8 +313,8 @@ async function _save_items(resources, mappings, context)
 /*
  * Save given definition of a resource/mapping to IndexedDB. If the definition
  * (passed as `item`) references files that are not already present in
- * IndexedDB, those files should be present as values of the `files_sha256`
- * object with keys being of the form `sha256-<file's-sha256-sum>`.
+ * IndexedDB, those files should be provided as values of the `files' object
+ * used to create the transaction context.
  *
  * context should be one returned from start_items_transaction() and should be
  * later passed to finalize_transaction() so that files depended on are added to
diff --git a/common/lock.js b/common/lock.js
index 8dd2f5b..f577481 100644
--- a/common/lock.js
+++ b/common/lock.js
@@ -68,9 +68,20 @@ function _lock(lock, cb) {
 
 #EXPORT  lock => new Promise(resolve => _lock(lock, resolve))  AS lock
 
+function try_lock(lock)
+{
+    if (lock.free) {
+	lock.free = false;
+	return true;
+    }
+
+    return false;
+}
+#EXPORT try_lock
+
 function unlock(lock) {
     if (lock.free)
-	throw new Error("Attempting to release a free lock");
+	throw new Exception("Attempting to release a free lock");
 
     if (lock.queue.length === 0) {
 	lock.free = true;