Add App Development Cheat Sheet

App-Development-Cheat-Sheet.md

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+# Tilde Friends Cheat Sheet
+
+Making apps for the impatient tilde friend.
+
+## Prerequisites
+
+- either run your own instance or use [tildefriends.net](https://www.tildefriends.net/)
+- register and login
+- [optional] use the `ssb` app to create yourself an SSB identity
+
+## Development Process
+
+1.  hit the `edit` link from any app or new app URL
+2.  make sure the path in the text box is under your username: `/~username/app/`
+3.  write server-side code in `app.js`
+4.  click the `save` button or press the save hotkey (Alt+S or _[browser-specific modifiers]_+S)
+5.  see the app reload on the right side
+
+## Output
+
+- **`app.setDocument(html)`** - send HTML to the browser
+- **`print(...)`** - send values to the browser's developer console
+
+## Persistence
+
+- **`app.localStorageGet(key)`** -> **`value`**
+- **`app.localStorageSet(key, value)`**
+- **`database()`**, **`shared_database(key)`**, **`my_shared_database(package, key)`**
+  - **`db.get(key)`** -> **`value`**
+  - **`db.set(key, value)`**
+  - **`db.exchange(key, expected, value)`** -> **`exchanged`**
+  - **`db.remove(key)`**
+  - **`db.getAll()`** -> **`[key1, ...]`**
+  - **`db.getLike(pattern)`** -> **`{key1: value1, ...}`**
+
+## SSB
+
+- **`ssb.createIdentity()`** -> **`id`**
+- **`ssb.getIdentities()`** -> **`[id1, ...]`**
+- **`ssb.appendMessageWithIdentity(id, content)`** -> **`message_id`**
+- **`ssb.blobStore(blob)`** -> **`blob_id`**
+- **`ssb.blobGet(id)`** -> **`blob`**
+- **`ssb.sqlAsync(query, args, row_callback)`**
+
+## TF-RPC
+
+Stock helper code for calling functions across the web server and browser boundary.
+
+- on the server: `import * as tfrpc from '/tfrpc.js';`
+- in the browser: `import * as tfrpc from '/static/tfrpc.js';`
+- either direction:
+  - register a function: `tfrpc.register(function my_function() {});`
+  - call a remote function: `let promise = tfrpc.rpc.my_function();`
+
+## Share
+
+- give out web links: [https://www.tildefriends.net/~cory/screwble/](https://www.tildefriends.net/~cory/screwble/)
+- use the `Attach App` button when composing a post in [the SSB app](https://www.tildefriends.net/~core/ssb/)
+
+## More Docs
+
+- [api reference](https://www.tildefriends.net/~cory/api/)
+- [source code](https://dev.tildefriends.net/cory/tildefriends/releases)