# Heynote Documentation [Changelog](https://heynote.com/docs/changelog/) Heynote is a dedicated scratchpad for developers. It functions as a large persistent text buffer where you can write down anything you like. Works great for that Slack message you don't want to accidentally send, a JSON response from an API you're working with, notes from a meeting, your daily to-do list, etc. The Heynote buffer is divided into blocks, and each block can have its own Language set (e.g. JavaScript, JSON, Markdown, etc.). This gives you syntax highlighting and lets you auto-format that JSON response. Available for Mac, Windows, and Linux. ## Features - Persistent text buffer - Block-based - Syntax highlighting: C++, C#, Clojure, CSS, Erlang, Dart, Go, Groovy, HTML, Java, JavaScript, JSX, Kotlin, TypeScript, TOML, TSX, JSON, Lezer, Markdown, PHP, Python, Ruby, Rust, Shell, SQL, Swift, Vue, XML, YAML - Language auto-detection - Auto-formatting - Math/Calculator mode - Currency conversion - Multi-cursor editing - Dark & Light themes - Option to set a global hotkey to show/hide the app - Default or Emacs-like key bindings ## Default Key Bindings **On Mac** ``` ⌘ + Enter Add new block below the current block ⌥ + Enter Add new block before the current block ⌘ + Shift + Enter Add new block at the end of the buffer ⌥ + Shift + Enter Add new block at the start of the buffer ⌘ + ⌥ + Enter Split the current block at cursor position ⌘ + L Change block language ⌘ + S Create a new note from the current block ⌘ + P Open note selector ⌘ + Down Goto next block ⌘ + Up Goto previous block ⌘ + A Select all text in a note block. Press again to select the whole buffer ⌘ + ⌥ + Up/Down Add additional cursor above/below ⌥ + Shift + F Format block content (works for JSON, JavaScript, HTML, CSS and Markdown) ``` **On Windows and Linux** ``` Ctrl + Enter Add new block below the current block Alt + Enter Add new block before the current block Ctrl + Shift + Enter Add new block at the end of the buffer Alt + Shift + Enter Add new block at the start of the buffer Ctrl + Alt + Enter Split the current block at cursor position Ctrl + L Change block language Ctrl + S Create a new note from the current block Ctrl + P Open note selector Ctrl + Down Goto next block Ctrl + Up Goto previous block Ctrl + A Select all text in a note block. Press again to select the whole buffer Ctrl + Alt + Up/Down Add additional cursor above/below Alt + Shift + F Format block content (works for JSON, JavaScript, HTML, CSS and Markdown) Alt Show menu ``` ## Download/Installation Download the appropriate (Mac, Windows or Linux) version from [heynote.com](https://heynote.com). The Windows build is not signed, so you might see some scary warning (I can not justify paying a yearly fee for a certificate just to get rid of that). ### Notes on Linux installation It's been reported [(#48)](https://github.com/heyman/heynote/issues/48) that ChromeOS's Debian VM need the following packages installed to run the Heynote AppImage: ``` libfuse2 libnss3 libnspr4 ``` ## Math Blocks Heynote's Math blocks are powered by [Math.js expressions](https://mathjs.org/docs/expressions). Checkout their [documentation](https://mathjs.org/docs/) to see what [syntax](https://mathjs.org/docs/expressions/syntax.html), [functions](https://mathjs.org/docs/reference/functions.html), and [constants](https://mathjs.org/docs/reference/constants.html) are available. ### Accessing the previous result The variable `prev` can be used to access the previous result. For example: ``` 128 prev * 2 # 256 ``` ### Changing how the results of Math blocks are formatted You can define a custom `format` function within the Math block like this: ``` _format = format # store reference to the built in format format(x) = _format(x, {notation:"exponential"}) ``` You can also do something like this to show the number with your default locale or provide a [custom one](https://www.w3.org/International/articles/language-tags/): ``` format(x) = x.toLocaleString(); format(x) = x.toLocaleString('en-GB'); ``` See the [Math.js format()](https://mathjs.org/docs/reference/functions/format.html) function for more info on what's supported. ## The buffer file The default paths for the buffer data for the respective operating systems are: - Mac: `~/Library/Application Support/Heynote/buffer.txt` - Windows: `%APPDATA%\Heynote\buffer.txt` - Linux: `~/.config/Heynote/buffer.txt`