Package IDWTET

The name idwtet stands for "I Don't Wanna Type Everything Twice". It provides a typst-ex and a typst-ex-code codeblock, which shows and executes typst code.

It is meant for code demonstration, e.g. when publishing a package, and provides some niceties:

• the code should always be correct in the examples: As the example code is used for the code block, but also for evaluation, there is no need to write it twice
• easy configuration with simple, uniform and good look

However, there are some limitations:

• Every code block has its own local scope and the default behaviour is that variables are not reachable from outside. A similar restriction lies on import statements. That is why, there is the eval-scope argument, which captures variables and simulates global variables. Additionally, a typst codeblock is provided for a consistent look.
• Locality can be displayed to the users by automatically wrapping code in typst-ex-code, but typst-ex does not provide such functionality. It might thus be difficult for users to understand code examples this way.
• The page width has to be defined in absolute terms. It is quite nice, for a showcase, to take the least possible space, but tracking the widths of all boxes and then setting the page width accordingly is not (yet) possible.

Usage

Only one function is defined, init(body, bcolor: luma(210), inset: 5pt, border: 2pt, radius: 2pt, content-font: "linux libertine", code-font-size: 9pt, content-font-size: 11pt, code-return-box: true, wrap-code: false, eval-scope: (:), escape-bracket: "%"), which is supposed to be used with a show rule.

Then raw codeblocks (with block=true) of the languages typst, typst-ex, typst-code and typst-ex-code are modified. The main feature of this package are typst-ex and typst-ex-code. The typst and typst-code blocks do not evaluate anything, but their design fits that of the others.

The parameters of init are:

• body: for usage with show rule, hence the whole document.
• bcolor: the background- (and border-) color of the blocks
• inset: inset param of code and content blocks, should be ≥ 2pt
• border: border thickness
• radius: block radius
• content-font: The font used in the previewed content / result.
• code-font-size: The fontsize used in the code blocks.
• content-font-size: The fontsize used in the preview content / result.
• code-return-box: If to show the code return type on typst-ex-code blocks.
• wrap-code: If to wrap the code in #{ and }, to symbolize local scope.
• eval-scope: A dictionary with the keys as the variable names and the values as another dictionary with keys value and code, both of these are optional. The former has the defined value, the latter the code recreate the variable, for usage in the code blocks.
• escape-bracket: The text to wrap a variable with, to access the code part of a eval-scope variable.

Hiding code and replacements

There are currently two methods to change the code:

• use the eval-scope argument from the init function. There is a code field in the dictionaries, which enables the usage of the key escaped in escape-bracket to be replaced in the codeblock code half and to be removed in the codeblock result half, as the value is given via scope. Take a look at the example below, where %ouset% is used this way.
• use the ENDHIDDEN feature. When escaped in escape-bracket, everything above the statement is removed from the codeblock code half BUT everything (without the ENDHIDDEN statement) is evaluated. Take a look at the example in the examples folder.

Example

#set page(margin: 0.5cm, width: 14cm, height: auto)
#import "@preview/idwtet:0.1.0"
#show: idwtet.init.with(eval-scope: (
  ouset: (
    value: {import "@preview/ouset:0.1.1": ouset; ouset},
    code: "#import \"@preview/ouset:0.1.1\": ouset"
  )
))

== ouset package #text(gray)[(v0.1.1)]
```typst-ex
%ouset%
$
"Expression 1" ouset(&, <==>, "Theorem 1") "Expression 2"\
               ouset(&, ==>,, "Theorem 7") "Expression 3"
$
```
Or something like
```typst-ex-code
let a = range(10)
a
```

Further examples are given in the repo example folder.