panglesd/slipshow

An engine for displaying slips, the next-gen version of slides

slipshow

Slipshow is a tool specifically designed for technical presentations where traditional slides are not enough.

In a slipshow presentation, the equivalent of a slide is called a slip. Each slip is like a slide, but with no bottom limit. That is, the content can be arbitrarily long! During the presentation, the camera will "scroll" down to reveal the hidden content, following a script given by the presenter!

Here are some properties of slipshow, in no specific orders:

• Fix some of the issues with slides by bringing back features of a blackboard presentation: keep some content while erasing the rest!
• Easy to write and readable syntax (markdown with few extensions). What you see is what you mean!
• Open the possibility for a more dynamic presentation, with annotations and animations.

Slipshow compiles files written in an extension of markdown, to a standalone html file viewable offline in any web browser.

If you want to see it in action, go to the example section. If you want to start writing your presentation, go to Quick start. Click for the full documentation and API, or continue reading to know more about this project!

The issue with traditional slides

When using traditional slides, you are given a rectangle of white space to express your thought. When this rectangle is full, you have no other choice than erasing everything, and start again with a new white rectangle.

This can be a problem both for the viewer and the presenter. If the viewer took some time understanding the beginning of the slide, they might miss the last part of a slide: everything will be erased before they have a chance to read it and catch up. And indeed, there is an obvious asymetry: the last part of a slide will be visible much shorter than the first part!

The presenter might want to show three information (1, 2 and 3), each requiring the previous one to be visible on screen. However, all three information might not fit in one screen! When the first two are visible, it is necessary to... start again with a fresh slide, while we would like to keep information 2 visible.

Of course, for many kind of presentation, with very few content in the slide, this is not a problem at all. However, for some of them, it can be quite an issue! Having had many courses on various technical subjects (mostly math and computer science), I can see how slides degraded the experience from a blackboard presentation.

Instead of starting of with a fresh slide, a slipshow presentation "scrolls down" to reveal new space usable by the presenter, without hiding everything. This is much closer to what happens with a blackboard: the presenter can erase half of it, and continue with the new free space! And a viewer a little bit late still has a chance to catch up, since half of the information is still there.

Examples

You can find several example of slip presentation, from different versions of slip. As they were from early stage of developpement, looking at the source code can be helpful but many things may have changed. Only the official example, tutorial and documentation are kept up to date.

• The slips of my thesis, the very first presentation that used (a very early version of) slipshow,
• Some other technical presentation (that also used an early version of the engine)

Use the arrows to navigate in the presentation.

Tutorial, API and Documentation

You can find an extensive documentation, with a tutorial at the readthedocs documentation.

Quick start

For a super quick start, just click visit sliphub.choum.net to start writing a presentation online.

For using slipshow offline, you'll need to install the slipshow tool. Currently, there are several ways to get it. The best is to download the precompiled binary from the latest release.

Slipshow is also package in some package manager:

# For opam users. TODO: Update once it has been released to opam.
$ opam pin slipshow [email protected]/panglesd/slipshow.git

# For npm users
$ npm install -g slipshow

Then, you can use the slipshow binary to compile a .md file to a slipshow presentation:

# Compile file.md into file.html:
$ slipshow -o file.html file.md

# Watch for changes in the file, automatically recompiling:
$ slipshow -o file.html file.md --watch

# Watch for changes in the file, automatically recompiling and hot-reloadind the opened presentation:
$ slipshow -o file.html file.md --serve

You're ready to go! Have a look at the syntax, or the full tutorial for a more gentle introduction.

Contributing

You can issue a Pull Request of any kind, report a bug, ask for a new feature, suggest an enhancement on the documentation (or make a Pull Request)... You can also write a theme.

License

MIT

slipshow's Issues

Compiler: better port support for `--serve`

Change port if used
Add an option to choose port

Unix.EOPNOTSUPP on arm64

Hi on my Mac OS M2 pro (Silicon) :

slipshow -o file.html file.md --watch
compile: internal error, uncaught exception:
         Unix.Unix_error(Unix.EOPNOTSUPP, "inotify_init", "")

Here's some more info :

file $(which slipshow)
/Users/mguiraud/.local/bin/slipshow: Mach-O 64-bit executable arm64

And my mac :

Seems some issue on the arm64 version of slipshow :

slipshow --version
%%VERSION%%

I used slipshow-macos-arm64.tar
decompile it and copied slipshow in the /usr/bin.

What am I missing ?

Add a ascii layout

I think it would be nice to have an "ascii layout" to place elements as ascii art.

For instance:

```layout
aa b
aa b
c dd
```
[a]: Some content
[b]: other content
[c]: and
[d]: so on

Getting started issue - How to separate different slides

I might missed something in the document. But how to separate different headline in separated slides?

Slide 1

Slide 2

Slide 3

After generating html file, all 3 slides are showing in the same page.

There is no sample markdown file anywhere. It is very hard to get started. The html file in example/ folder is more of demo, instead of an example.

Can you provide the uncompiled raw markdown file for the beginners

Very nice work, but it's still hard for beginners to create presentation, can you provide the examples with uncompiled raw markdown file (not html file)? so we could learn and make modifications. Thanks!

Make existing example presentations use the latest engine

They will benefit the latest bugfixes, which is nice since they serve as example.

Check that there were no breaking change in the engine (I don't think there were!)

Engine: wrong computed size on subslips

See for instance https://choum.net/panglesd/slides/WDCM-2021-slips/wdcm-ada.html section III.17

Have a github action to compile and publish a presentation on github pages

Taking inspiration from https://github.com/ralexander-phi/marp-to-pages.
Thanks 8organicbits for the idea!

Have a way to move relatively positioned items WYSIWYG

Using slipshow --serve, markdown locations, ...

Resizing could be cool as well!

Add an easy way to add "intro screen" in presentations

It is nice in eg beamer that you can add a description of your information, and the theme organizes them in a presentation screen.

I want the same!

Add support for mermaid

Mermaid seem a popular and nice diagramming library, markdown-consistent.

I'd consider adding support for it! Github has it:

graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;

Compiler: Add support for subslips

The engine support having subslips, but it is not possible to have them in the compiler.

An idea for the syntax:

{subslip}
> subslip content
> ...

Improve theming

• Multiple themes should be shipped in the compiler (at least the two we have: warsaw inspired and Vanier)
• It should be easy to add a theme: the workflow should be documented.

Compiler: Add support for separating the presentation in multiple files

The compiler would load the "dependencies".

Idea for syntax:

![path/to/input.md]

This could be combined with #28:

{subslip}
![path/to/input.md]

scroll doesn't work on Mobile

I tried opening the two sample projects, but couldn't get passed the first 'page'

Engine: rewrite in OCaml

The engine was written in javascript a long time ago, when I did not know a lot about static checking!

It will be very convenient to have it in OCaml, compiled to javascript.

In this rewrite, I'd like to change at least one thing: the "step back". Instead of recording the initial step and "go back to the beginning, go forward $n-1$ steps", it would be much better to apply the "reverse effectful" function.

This also raises the question of how much is computed at runtime by the engine and how much is computed at compile-time by the compiler!

Some invalid syntax crashes the compiler

A file containing

| {a}[b] |

generates:

compile: internal error, uncaught exception:
         File "vendor/github.com/panglesd/cmarkit/src/cmarkit.ml", line 2173, characters 6-12: Assertion failed

Support for pre-recorded handwritten content

Sometimes, figures are much quicker to make by hand.

I'd like to have a way to record writing and save it to a file, similarly to https://github.com/panglesd/write-your-website, but included in slipshow's writing workflow!

figure overlays

it would be nice to have a way to reveal figures layer by layer (assuming a stack of transparent layers has been generated).

Add support for tikz

The npm package has support for tikz support, in some sense.

It would be so cool (but technically difficult) to have support for tikz directly in slipshow!

Allow to include video or large file

Dataurls have a limit, but there are workaround, à la ocaml-crunch!

<script>
  let file_content = "\56\54[...]";
  document.replace(old_element, element_from_file_content)
</script>

(not very precise but ...)

feat: allows users to find the source markdown within the rendered html file

This would increase portability and would allow users to edit the presentation themselves.

Populate the example section

Over the year I have made several presentations that show the capabilities of slipshow. I should showcase them!

Related to #33 #31

Add support for themes

Problem

The actual theme is inspired by Warsaw but it would be great to have a way to easily change or modify the theme, without tinkering with the distributed css.

Naive suggestion

• Make the common css (in src/css) as neutral as possible.
• Add some pre-made themes like the actual Warsaw theme in a folder like src/css/themes.
• In the example include first the theme-agnostic css, then the chosen theme css, then the specialized slipIntroduction.css.
• Document the various classes that users would need to override to make their own theme.

Allow to use tailwindcss or tachyon for easy css customization

Which one? tailwind needs compilation...

Admonitions title should contain inline markdown

It is frustrating eg not to be able to write math in a definition name!

Binary release file got CPU arch wrong (says x86_64, but it's actually arm)

Binary release file got CPU arch wrong (says x86_64, but it's actually arm).

https://github.com/panglesd/slipshow/releases/download/v0.0.32/slipshow-macos-x86_64.tar

It doesn't run on my Intel machine. :(

Make sure compiled presentations are standalone

For instance, for mathjax math I had to change it to svg, but there are still assets that are not included I think.

But more importantly, fonts need to be included for all browser to display the presentation the same!

Have feature parity on all distributions of slipshow

The npm package lack some feature. Do I want to still support it?

slipshow-gui, the VSCode extension, are on other repo but would benefit from some change in the API to support local images!

Fix issue with images with attributes

The following file:

![](https://avatars.githubusercontent.com/u/34110029?s=80&v=4){.myclass}

will have the wrong output:

<p><img src="[https://avatars.githubusercontent.com/u/34110029?s=80&amp;v=4](view-source:https://avatars.githubusercontent.com/u/34110029?s=80&v=4)" alt="" ><span class="myclass"><span>![](https://avatars.githubusercontent.com/u/34110029?s=80&amp;v=4)</span></span></p>

Linking to hidden subtrees or conditional display of subtrees

Is there any way to have event handlers on elements within a slip, that can then trigger moving to another slide? (long winded way of saying ‘link’).

Or is there a way to conditionally hide/show a slip?

The motivation is if one had a presentation that is intended for audiences of different levels of prior knowledge.

Re: links - one might have a subslip-tree (slip-subtree?) that is too detailed for the main body of (one version of) the presentation. So in the flow of the main talk, those overly-detailed subtrees would not be traversed. However maybe its likely you’ll have to return to it in the Q+A at the end. In this case, links to these subtrees would be useful to have in the end slip. Or if someone were to pose a relevant query during the presentation, an inline link from the parent slip of the overly-detailed subtree.

Re: conditionality - one could have a single presentation where the slip hierarchy goes into increasing levels of detail on the presentation topic. But conditionality allows for ‘lower-resolution’ versions of the same presentation, by setting a depth parameter (‘only go into this sliptree to nesting_level=X’) somewhere (presumably in Javascript).

They’re obviously related issues (an event handler that conditionally shows the subtree is equivalent to a link to the subtree), hence combining them into a single issue. Basically something like Milanote or ‘Workflowy-for-slides’, where you can expand/collapse subtrees.

Kudos on the whole project though, its really great to have an OSS multiply-nested presentation lib. I’m surprised its not more known more widely..

Rewrite existing example presentation in markdown

This makes them much better examples and will check that markdown is expressive enough and nice to write... (or not!)