heynote/docs/index.md

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# Heynote Documentation
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.
## Default Key Bindings
<!-- keyboard_shortcuts -->
**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
⌘ + 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 + 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`