ElasticNotepad

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Text editor with elastic tabstops

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# Elastic Notepad

Wouldn't it be nice if we could use proportional fonts to write code and still
have things line up? Well, thanks to
[elastic tabstops](http://nickgravgaard.com/elastic-tabstops/), now we can. This
editor implements that invention, and should serve as a reference for anyone who
wants to implement it in other editors.

The reference implementation of the core elastic tabstops algorithm can be
found in [elasticTabstops.scala](app/src/elasticTabstops.scala).

## Prerequisites

Since Elastic Notepad is written in Scala, you'll need to have Java installed to
run it, specifically Java 14 or later.

The current version's settings default to using the fonts
[Merriweather](https://fonts.google.com/specimen/Merriweather) and
[Inconsolata](https://fonts.google.com/specimen/Inconsolata). If you don't have
them installed, your system's default Serif and Monospaced fonts will be used
instead. You can change Elastic Notepad's settings to use whatever fonts
you like, but I recommend trying it with these fonts first. I've found this
pairing to work well when you repeatedly switch between them (as you toggle
elastic tabstops on and off).

On Windows at least, if you install Java for the sake of running this, it seems
you'll need to restart your system before Java can use logical fonts properly.
(So restart your system if you notice that toggling elastic mode off doesn't
switch to a monospaced font and text doesn't *appear* lined up as a result.)

## Running it

To run the jar file, use this:

java -jar elastic-notepad.jar

## Changing it

When developing, if necessary, switch to Java 14 or later using Coursier:

eval "$(cs java --jvm 14 --env)"

and then run it with:

mill app.run

and run the tests with:

mill app.test

If you are using IntelliJ IDEA, its project config files can be generated (and regenerated should the build definition change) with:

mill mill.scalalib.GenIdea/idea

You can build a new jar file with:

mill clean && mill app.assembly

## Ugly font rendering?

Some systems do a poor job of rendering fonts in Java GUIs. On my Linux system
I've added the following line to `$HOME/.profile` to fix this:

export _JAVA_OPTIONS="$_JAVA_OPTIONS -Dawt.useSystemAAFontSettings=on"

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