marcel VS pyp

Marcel is one of the pipe-objects-instead-of-strings shells (https://marceltheshell.org).

Here's a blog post showing how to use marcel to generate graphs directly from the command line.

https://www.marceltheshell.org/post/generating-graphs-from-t...

Check out marcel (https://marceltheshell.org). It's yet another pipe-objects-instead-of-strings shell (like nushell). Unlike nushell, you pipe Python values. Marcel has no sublanguages (like awk, sed, ...). Instead, when logic is needed, you write Python code, delimited by parens. So:

    (USER)

It is a useful correction. This project predates the release of the movie: https://github.com/geophile/marcel/commit/bb6adacbb6b3a683ce...

Check out marcel: https://marceltheshell.org, and https://github.com/geophile/marcel. Both marcel and nushell start with the idea of piping structured data instead of strings, which is incredibly powerful. (This also applies to osh. I am the author of osh and marcel.)

Marcel (and osh) rely on Python types and language where typical shells have sublanguages. So instead of awk or find and their sublanguages, you just use Python. Instead of piping strings, you pipe streams of Python values.

Marcel lets you use Python on the commmand line. It also has an API which allows you to use shell-like commands inside of Python programs.

I wrote a shell, marcel, that pipes Python values instead of strings: https://marceltheshell.org.

It also does the inverse, allowing you to run marcel commands from Python, e.g. https://www.marceltheshell.org/scripting-1

Check out my entry, marcel: https://marceltheshell.org.

E.g., find the newest vlc instance and kill it (a command that an acquaintance needs frequently, for some reason):

    ps | select (p: p.name == 'vlc') | sort (p: p.create_time) | tail 1 | (p: p.signal(9))

> I too can never remember jq syntax when I need to. I usually just end up writing a Python script

Same here! That's why for small things I made pyxargs [1] to use python in the shell. In another thread I also just learned of pyp [2] which I haven't tried yet but looks like it'd be even better for this use case.

[1] https://github.com/elesiuta/pyxargs

[2] https://github.com/hauntsaninja/pyp

I have bookmarked/tried so many Python/Shell mashups over the years.

IMHO the following is about the only one that's tasteful and not going off the deep end: https://github.com/hauntsaninja/pyp

I wrote a similar tool a while back that lets you create your own "magic" variables. I use `f` all the time! https://github.com/hauntsaninja/pyp#pyp-lets-you-configure-y...

Thank you for the extensive and thoughtful comment! This does help clarify your approach quite considerably. I wonder, since you are hoping to attract collaborators, whether there is some kind of formal spec for the language somewhere? For example, you mentioned parallel efforts: suppose I wanted to write a port to pure C; is there any way, short of reading every one of your posts and trying to contain the whole language in my head at once, for me to know exactly what I need to implement?

Something I've been trying to figure out: what is the exact relationship at present between OSH and Oil? When you say "OSH" do you mean the language, or the shell itself "oil shell"? If Oil is not something I can download, why exactly does that `const v = max(1, 2)` statement work in osh? It's clearly not just a Bash implementation, it's got other features. Is that a subset of Oil's features? Which subset?

Since you're also interested in other shells, you might have a look at pyp [1]. It captures a lot of the way I personally would like to use some future shell. If the features of pyp were integrated into the shell itself, you wouldn't need an external command, you could just (for example) pipe the output of one program into a python-like statement that mangles the incoming strings in some way, and pipe that out to some xargs-like program to use in a subshell. (The fact that you apparently can't use the pipe in what Xonsh calls "Python mode" is for me the central limiting feature of that shell.)

[1] https://github.com/hauntsaninja/pyp

9. Pyp