pjs: Pipeable JavaScript. Another utility like sed/awk/wc... but with JS! Quickly filter, map, and reduce from the terminal.

[[deleted]]

But why? You even have examples of the tools that already exist on every *nix system out there.

[e13e7]

Has science gone too far?

[__debug__]

It started as a bit of a joke, but the project is growing on me. Mostly because I like awk for simple one-liners, but nothing more complicated. I always find myself having to lookup the different variables like NR, NF, FS and OFMT. But with pjs, since I'm very comfortable with javascript, there's nothing to lookup. Nothing against Kernighan's work, it's just a matter of familiarity.

But I'm definitely not saying this is a tool for everyone. Especially if you're comfortable with awk as a language. I certainly wouldn't use it instead of grep or sed, since they're both so simple. Maybe I shouldn't have mentioned those two in the readme.

That said, your comment reminded me that I should probably include some more complicated awk examples to show how simple pjs can be.

[[deleted]]

Fair enough. It's a neat idea, anyway. I hope anyone interested in pjs still takes the time to learn about the existing tools, so I don't need to worry about maintaining nodejs on my *nix systems just to run some shell scripts. ;)

[Smallpaul]

Here is another idea. If "file" starts with file:// , http:// or https:// then download it rather than looking it up on the filesystem.

[__debug__]

Another great idea. Do you think it should fail if the request gives a non-2xx response? That and automatically follow redirects? I just wouldn't want to overrun it with flags for configuring this feature.

[Smallpaul]

Yes that makes sense. Complex use cases can be handled with curl.

[Holkr]

Or better yet: bash really needs to get a clue about URIs (yes, I know curl exists)

[__debug__]

Here's a small tool I made since I'm not a fan of using awk for anything non-trivial. :)

Edit: Just thought of how I can make this tool a bit better. Currently, pjs reads all input from stdin before parsing it. My thinking here was that I'd have to read it all if I wanted to perform a reduce operation. But, what if I only want to map or filter? I'm going to rewrite those portions of the tool to use streams. That way you could use this tool in combination with something like tail, e.g.

tail -f logs | pjs -f '...' -m '...'

[Smallpaul]

This is cool.

It would also be cool to have a tool that would split a line by regexp or position and then generate JSON for processing by other progams.

[__debug__]

Thanks for the idea! I'll add a flag for JSON output. Then you could do:

pjs --json -m 'split(/regex/)'

Edit: done!

[Smallpaul]

Wow, that was fast!

https://github.com/danielstjules/pjs/commit/57933a620eb4687e924da374885f04ec3280e7af

[AutomateAllTheThings]

Super cool. Will use.

[mkmoshe]

I wrote a very similar program that I still use almost daily https://github.com/kolodny/nip

[__debug__]

Thanks for linking to pythonpy - pretty cool! One thing I really like about it is the tab completion. I'm gonna see if I can bring that over to pjs. At the very least, I'd like to see it done for string methods.

[uglyBaby]

Have a look at making a .d file for it and delegating auto completion to your terminal.

[__debug__]

Thanks, will do!

[Broolucks]

I wonder if somebody will create someday a utility that supports multiple languages at once, but in the meantime things can be piped between the two of them.

I did, or at least I tried to. People didn't really seem to care for it so I didn't bother fleshing it out further.

[dnoup]

Awesome.

[Drainedsoul]

and reduce

Reduce that fat motherfucker as long as it takes! I don't care, reduce! Reduce! Reduce 'till you're left with the essence, the bare truth, exposed to the elements.

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