I don't plan to make a version that gets its data from local man pages, but it would be great if such a tool existed.
Parsing the data out of man pages is messy, and my process currently involves a lot of steps. I actually only started collecting the data for this as a side-effect of trying to make man pages render nicely in browsers.
I would like to open source more of the backend, but I've started with a tool I wrote to extract man pages from project repos: https://github.com/jacksonp/manlib
Thanks for mentioning explainshell.com I occasionally run into commands I've not seen before and end up wading through man pages, this is way more terse.
Awesome concept! I've never been a fan of looking up flags in another tab, and hunting down which ones are in use. Just seems like it should be an automatic process. The explainshell website is great, but it doesn't work offline. Fish's man page auto-completion is useful, but it lists all the flags, instead of the ones currently in use. If I could have this for every command out there, along with the binary's location/version at the top, I'd be a happy camper.
Why does it say "in the shell" when the actual work is done by a web server? Sorry, I was just really curious how you grep/awk/sed through some man pages.
And it seems like your site / API backend is not open source. Do you plan to make an offline version?