The ultimate interface _for me_ would be somewhere in between Calca (which I think has superior support for functions/graphing/logical calculations) and Soulver (which I think has better usability/readability) and a graph-based note-taking system like Obsidian/Zettlr. I'm sure somebody will say "there is a Vim plugin that'll do that" but… yea.

It's there, already. The direct link in the OP are to the release notes

https://github.com/bbodi/notecalc3/blob/develop/README.md

This serves well the primary goal of NoteCalc so I did not spend more time on it yet, but I am on the same page as you, and if NoteCalc will be feature-complete, I will give an other shot to arbitrarily large calculations/precision.

So far it just has variables and basic arithmetic. Other features on my roadmap: rational numbers, a type hierarchy, units, and lazy/smart combinatorics.

What do you imagine the timezone DB would look like? I'd love to hear your ideas!

It runs on top of the JVM so there's an Android port also. The Android app appears as two icons. One as a simple calculator and the other as a simple scripting editor for more complex requirements.

https://numi.app/

But fortunately, the whole architecture was designed with the terminal in mind: - 99% of the functionalty is implemented as a lib, and just a tiny part is responsible for input and rendering, so it is very easy to write new frontend for it. - both the rendering and the input uses characters as a basic for coordinates, so it is easy to translate the render commands generated by the lib to the terminal.

[0]: Not sure of the actual term in English

The reason is that the content of the note is stored in the URL so it is easy to share it by sending the url to friends. So the URL changes basically on every modification.

I add it to the fixlist.

Unfortunately it seems units cannot be applied to function results. It must be fixed, I noted down, thanks!

Though, beside that, I think it provides some nice features. E.g. the matrix creation/editing functionality was born because I could not find a simple tool to double check my rendering calculations with.

Why WASM:

One of the primary goal of NoteCalc is to be easily accessible (e.g. it was mainly born because Soulver is MacOS only). So the browser-based client was obvious choice, and I chosed WASM for

- performance reasons

- to be able to use rust

- to avoid as much JS (and related technologies) as possible

Why Canvas:

I answered here: https://github.com/bbodi/notecalc3/issues/6#issuecomment-749...

In a previous versions, only the changed areas were re-rendered, but the code was much more complex and error-prone, and it did not bring any performance improvement, so now I just rerender everything, still excellent performance but much simpler code. However this is different for calculations, only changed/affected lines are reparsed and recalculated.

An idea you might consider is to display some kind of warning symbol or message if the input contains digits or operands which are not interpreted as part of the calculation that produces the output. This would have made the semantic meaning of the syntax highlighting immediately more evident.

https://en.wikipedia.org/wiki/Language_and_the_euro#Written_...

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You can perform actual in-place calculations by using the expression register. So for example:

    = 2 + 2
    <insert mode cursor here>

    = 2 + 2
    4 

And using regular :global you could perform similar operations across a file with `:g/^= / <expression replacement>`

I think the real solution would be just to use evil-mode in emacs when you wish to use things like literate-calc-mode. I do that for org-mode because it is just so much more powerful than the basic vim plugin for org-mode files.

> Is it something very difficult in vim?

Since 8.2 was released you can use popupwin¹ to emulate something similar. I'd probably give it a go if you wrote it :P

It is a real shame you can't use a funcref(or even multiple characters) for conceal replacement, or you could simply add a conceal² for => to show the result. Such functionality would also be nice for inlining computed types in various languages too.

¹ https://vimhelp.org/popup.txt.html

² https://vimhelp.org/syntax.txt.html#conceal

See how line 11 dynamically changes in this video based on whether his cursor is on the line:

https://youtu.be/C0OwhiCp2Hk?t=223

I believe this is done using "conceal" as JNRowe says, e.g. here:

https://github.com/vimwiki/vimwiki/blob/619f04f89861c58e5a64...

I also second what JNRowe says about trying the new popup feature. I recently used this to run a script that calculates something based on where my cursor is currently at in the file, then show the result at the cursor using a popup:

    fun! CalculateFoodCalories()
      let day = GetSectionName()
      let day = substitute(day, "\[", "", "g")
      let day = substitute(day, "\]", "", "g")
      let out = split(trim(system("food --date=" . day)), "\n")
      call popup_atcursor(out, #{ title: "Today's calories", highlight: 'Statement', border: [],  padding: [1,2,1,2]})
    endfun
    nnoremap <silent> <leader>m :call CalculateFoodCalories()<CR>