My warning about the feature differences was meant to temper ag users' expectations. There are lots of little things that ag users are accustomed to that are either different or missing in ripgrep. Off the top of my head: Ag reads the user's global gitignore. (This is harder than most people think.) It detects stdout redirects such as "ag blah > output.txt" and ignores output.txt. It can search gz and xz files. It defaults to smart-case searching. It can limit a search to one hardware device (--one-device), avoiding slow reads on network mounts. And as a commenter already pointed out, it supports the --pager option. Taken together, all those small differences are likely to cause an average ag user some grief. I wanted to manage expectations so that users wouldn't create annoying "issues" (really, feature requests) on your GitHub repo. Sorry if that came off the wrong way.
On a completely unrelated note: I see ripgrep supports .rgignore files, similar to how ag supports .agignore. It'd be nice if we could combine forces and choose a single filename for this purpose. That way when the next search tool comes along, it can use the same thing instead of .zzignore or whatever. It would also make it easier for users to switch between our tools. I'd suggest a generic name like ".ignore" or ".ignores", but I'm sure some tool creates such files or directories already.
Edit: Actually, it looks like .ignore can work. The only examples I've found of .ignore files are actual files containing ignore patterns.
In principle I'd be fine standardizing on a common ignore file. We'd need to come up with a format (I think I'd vote for "do what gitignore does", since I think that's what we're both doing now anyway).
Adding files to this list is kind of a bummer though. I could probably get away with replacing `.rgignore` proper, but I suspect you'd need to add it without replacing `.agignore`, or else those angry users you were talking about might show themselves. :-)
I do kind of like `.grepignore` since `grep` has kind of elevated itself to "search tool" as a term, but I can see how that would be confusing. `.searchignore` feels too long. `.ignore` and `.ignorerc` feel a bit too generic, but either seems like the frontrunner at the moment.
I really like .ignore, and I like it because it's generic. The information I want it to convey is:
> Dear programs,
> If you are traversing this directory, please ignore these things.
Of course, some programs could still benefit from having application-specific ignore files, but it'd cut down on a lot of cruft and repetition.
I'll tag a new release in a day or two. Also, it looks like the sift author is getting on the .ignore train: https://github.com/svent/sift/issues/78#issuecomment-2493352...
This worked out pretty well. :)
Keep it up all (rg/ag/sift)!
Also, what about programs that have search functionality as part of their design, but not as their core function? For example, I don't want my text editor to search .min.js files. I'd even prefer it if such files didn't show up in my editor's sidebar. Do I have to add *.min.js to .searchignore and .atomignore? (Or if the editor people ever work out a standard, maybe it will be .editorignore.)
If I had to draw a Venn diagram of ignore patterns in my text editors, my search tools, and my rsync scripts, they'd mostly overlap. I don't deny the need for application-specific ignores, but there is a large class of applications that could benefit from a more generic ignore file.
But I like the idea of standardizing this. Perhaps the cache directory tagging standard gives some inspiration.
Is there a portable way for you to find out that stdout is connected to output.txt? isatty() only tells you that there may be a redirection and I suppose on linux you could use /proc/self/fd/1 but I don't know how to do it portably.
I would immediately intuit that such a file is a (r)untime (c)onfiguration for ignoring something.
.ignore isn't... bad, it just looks like something I can safely delete, like a file styled `such-and-such~`
What I like about '.ignore' is that it's not tied to grep (which will never use it) but expresses that the concept is agnostic. You can imagine lots of programs supporting it.