nip-13: show working msg and cancel btn while mining

mining often takes a few seconds. it can be confusing if nothing
happens when a user is publishing their profile, upvoting a note
or posting a new note.

added visual feedback that nostrweb is working with an option to
cancel the mining process.

src/cards.css

@@ -97,6 +97,16 @@
   overflow: visible;
   position: relative;
 }
+.mbox .buttons {
+  margin-top: .2rem;
+}
+.mbox button:not(#publish) {
+  --bg-color: none;
+  --border-color: none;
+}
+.mbox button img + small {
+  padding-left: .5rem;
+}
 .mobx-replies {
   flex-grow: 1;
   position: relative;

src/form.css

@@ -97,14 +97,22 @@ textarea:focus {
   align-items: center;
   display: flex;
   flex-basis: 100%;
-  justify-content: flex-end;
   gap: var(--gap);
-  margin-top: 2rem;
+  justify-content: start;
+  margin-top: var(--gap-half);
   min-height: 3.2rem;
 }
+form .buttons,
+.form .buttons,
 .form-inline .buttons {
   flex-basis: fit-content;
-  margin-top: 0;
+  justify-content: end;
+}
+
+.buttons img,
+.buttons small,
+.buttons span {
+  vertical-align: middle;
 }
 
 button {
@@ -123,24 +131,11 @@ button:focus {
 
 .btn-inline {
   --border-color: transparent;
-  align-items: center;
   background: transparent;
-  color: var(--color);
+  color: var(--color-accent);
-  display: inline-flex;
+  display: inline-block;
-  gap: .5ch;
   line-height: 1;
-  padding: .6rem;
+  padding: 0 .6rem;
-}
-.btn-inline img {
-  max-height: 18px;
-  max-width: 18px;
-}
-.btn-inline img[alt] {
-  color: #7f7f7f;
-  line-height: 1px;
-}
-.btn-inline img[alt]::before {
-  font-size: 3.4rem;
 }
 
 .btn-danger {
@@ -156,6 +151,7 @@ button:disabled {
 .form-status {
   flex-basis: 100%;
   flex-grow: 1;
+  min-height: 1.8rem;
   padding: var(--padding);
 }
 

src/main.js

@@ -217,7 +217,7 @@ document.body.addEventListener('click', (e) => {
       writeInput.blur();
       return;
     }
-    appendReplyForm(button);
+    appendReplyForm(button.closest('.buttons'));
     localStorage.setItem('reply_to', id);
     return;
   }
@@ -442,26 +442,24 @@ function createTextNote(evt, relay) {
       ...content,
       (firstLink && validatePow(evt)) ? linkPreview(firstLink, evt.id, relay) : '',
     ]),
-    elem('button', {
+    elem('div', {className: 'buttons'}, [
-      className: 'btn-inline', name: 'star', type: 'button',
+      elem('button', {name: 'reply', type: 'button'}, [
-      data: {'eventId': evt.id, relay},
+        elem('img', {height: 24, width: 24, src: 'assets/comment.svg'})
-    }, [
+      ]),
+      elem('button', {name: 'star', type: 'button'}, [
         elem('img', {
           alt: didReact ? '✭' : '✩', // ♥
           height: 24, width: 24,
           src: `assets/${didReact ? 'star-fill' : 'star'}.svg`,
           title: getReactionList(evt.id).join(' '),
         }),
-      elem('small', {data: {reactions: evt.id}}, hasReactions ? reactionMap[evt.id].length : ''),
+        elem('small', {data: {reactions: ''}}, hasReactions ? reactionMap[evt.id].length : ''),
+      ]),
     ]),
-    elem('button', {
-      className: 'btn-inline', name: 'reply', type: 'button',
-      data: {'eventId': evt.id, relay},
-    }, [elem('img', {height: 24, width: 24, src: 'assets/comment.svg'})]),
     // replies[0] ? elem('div', {className: 'mobx-replies'}, replyFeed.reverse()) : '',
   ]);
   if (restoredReplyTo === evt.id) {
-    appendReplyForm(body.querySelector('button[name="reply"]'));
+    appendReplyForm(body.querySelector('.buttons'));
     requestAnimationFrame(() => updateElemHeight(writeInput));
   }
   return renderArticle([
@@ -770,7 +768,6 @@ miningTimeoutInput.addEventListener('input', (e) => {
 miningTimeoutInput.value = timeout;
 
 async function upvote(eventId, eventPubkey) {
-  const privatekey = localStorage.getItem('private_key');
   const note = replyList.find(r => r.id === eventId) || textNoteList.find(n => n.id === (eventId));
   const tags = [
     ...note.tags
@@ -778,16 +775,26 @@ async function upvote(eventId, eventPubkey) {
       .map(([a, b]) => [a, b]), // drop optional (nip-10) relay and marker fields
     ['e', eventId], ['p', eventPubkey], // last e and p tag is the id and pubkey of the note being reacted to (nip-25)
   ];
+  const article = (feedDomMap[eventId] || replyDomMap[eventId]);
+  const reactionBtn = article.querySelector('[name="star"]');
+  const statusElem = article.querySelector('[data-reactions]');
+  reactionBtn.disabled = true;
   const newReaction = await powEvent({
     kind: 7,
     pubkey, // TODO: lib could check that this is the pubkey of the key to sign with
     content: '+',
     tags,
     created_at: Math.floor(Date.now() * 0.001),
-  }, difficulty, timeout).catch(console.warn);
+  }, {difficulty, statusElem, timeout}).catch(console.warn);
-  if (newReaction) {
+  if (!newReaction) {
+    statusElem.textContent = reactionMap[eventId]?.length;
+    reactionBtn.disabled = false;
+    return;
+  }
+  const privatekey = localStorage.getItem('private_key');
   const sig = await signEvent(newReaction, privatekey).catch(console.error);
   if (sig) {
+    statusElem.textContent = 'publishing…';
     const ev = await pool.publish({...newReaction, sig}, (status, url) => {
       if (status === 0) {
         console.info(`publish request sent to ${url}`);
@@ -796,7 +803,7 @@ async function upvote(eventId, eventPubkey) {
         console.info(`event published by ${url}`);
       }
     }).catch(console.error);
-    }
+    reactionBtn.disabled = false;
   }
 }
 
@@ -816,6 +823,17 @@ writeForm.addEventListener('submit', async (e) => {
     return onSendError(new Error('message is empty'));
   }
   const replyTo = localStorage.getItem('reply_to');
+  const close = () => {
+    sendStatus.textContent = '';
+    writeInput.value = '';
+    writeInput.style.removeProperty('height');
+    publish.disabled = true;
+    if (replyTo) {
+      localStorage.removeItem('reply_to');
+      newMessageDiv.append(writeForm);
+    }
+    hideNewMessage(true);
+  };
   const tags = replyTo ? [['e', replyTo, eventRelayMap[replyTo][0]]] : [];
   const newEvent = await powEvent({
     kind: 1,
@@ -823,29 +841,24 @@ writeForm.addEventListener('submit', async (e) => {
     pubkey,
     tags,
     created_at: Math.floor(Date.now() * 0.001),
-  }, difficulty, timeout).catch(console.warn);
+  }, {difficulty, statusElem: sendStatus, timeout}).catch(console.warn);
-  if (newEvent) {
+  if (!newEvent) {
+    close();
+    return;
+  }
   const sig = await signEvent(newEvent, privatekey).catch(onSendError);
   if (sig) {
+    sendStatus.textContent = 'publishing…';
     const ev = await pool.publish({...newEvent, sig}, (status, url) => {
       if (status === 0) {
         console.info(`publish request sent to ${url}`);
       }
       if (status === 1) {
-          sendStatus.textContent = '';
+        close();
-          writeInput.value = '';
-          writeInput.style.removeProperty('height');
-          publish.disabled = true;
-          if (replyTo) {
-            localStorage.removeItem('reply_to');
-            newMessageDiv.append(writeForm);
-          }
-          hideNewMessage(true);
         // console.info(`event published by ${url}`, ev);
       }
     });
   }
-  }
 });
 
 writeInput.addEventListener('input', () => {
@@ -959,16 +972,19 @@ profileForm.addEventListener('input', (e) => {
 profileForm.addEventListener('submit', async (e) => {
   e.preventDefault();
   const form = new FormData(profileForm);
-  const privatekey = localStorage.getItem('private_key');
-
   const newProfile = await powEvent({
     kind: 0,
     pubkey,
     content: JSON.stringify(Object.fromEntries(form)),
     tags: [],
     created_at: Math.floor(Date.now() * 0.001),
-  }, difficulty, timeout).catch(console.warn);
+  }, {difficulty, statusElem: profileStatus, timeout}).catch(console.warn);
-  if (newProfile) {
+  if (!newProfile) {
+    profileStatus.textContent = 'publishing profile data canceled';
+    profileStatus.hidden = false;
+    return;
+  }
+  const privatekey = localStorage.getItem('private_key');
   const sig = await signEvent(newProfile, privatekey).catch(console.error);
   if (sig) {
     const ev = await pool.publish({...newProfile, sig}, (status, url) => {
@@ -982,7 +998,6 @@ profileForm.addEventListener('submit', async (e) => {
       }
     }).catch(console.error);
   }
-  }
 });
 
 const errorOverlay = document.querySelector('#errorOverlay');
@@ -1046,20 +1061,31 @@ function validatePow(evt) {
  * a zero timeout makes mineEvent run without a time limit.
  * a zero difficulty target just resolves the promise without trying to find a 'nonce'.
  */
-function powEvent(evt, difficulty, timeout) {
+function powEvent(evt, options) {
+  const {difficulty, statusElem, timeout} = options;
   if (difficulty === 0) {
     return Promise.resolve(evt);
   }
+  const cancelBtn = elem('button', {className: 'btn-inline'}, [elem('small', {}, 'cancel')]);
+  statusElem.replaceChildren('working…', cancelBtn);
+  statusElem.hidden = false;
   return new Promise((resolve, reject) => {
     const worker = new Worker('./worker.js');
 
+    const onCancel = () => {
+      worker.terminate();
+      reject('canceled');
+    };
+    cancelBtn.addEventListener('click', onCancel);
+
     worker.onmessage = (msg) => {
       worker.terminate();
+      cancelBtn.removeEventListener('click', onCancel);
       if (msg.data.error) {
         promptError(msg.data.error, {
           onCancel: () => reject('canceled'),
           onAgain: async () => {
-            const result = await powEvent(evt, difficulty, timeout).catch(console.warn);
+            const result = await powEvent(evt, {difficulty, statusElem, timeout}).catch(console.warn);
             resolve(result);
           }
         })
@@ -1070,6 +1096,7 @@ function powEvent(evt, difficulty, timeout) {
 
     worker.onerror = (err) => {
       worker.terminate();
+      cancelBtn.removeEventListener('click', onCancel);
       reject(err);
     };