| --- Log opened Mon Jun 01 00:00:37 2020 |
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| 07:48 | <&[R]> | Man, xs is nice sometimes, but other times it's just... WHYYYYYYY |
| 07:49 | <&[R]> | var = `` \n {if {./tst.js >[2=1]} { echo GOOD } else { echo BAD }}; echo $var |
| 07:50 | <&[R]> | So that's just a little test I made, tst.js will randomly write something to stderr then exit(1), or write something to stdout and exit(0) |
| 07:50 | <&[R]> | I wanted to both capture the output AND the exit code |
| 07:51 | <&McMartin> | Whoof. I think I can make Python subprocess do that but it's *not* easy to multiplex on two streams at once like that. |
| 07:51 | <&[R]> | So I've got to shove the entire thing into a blockquoted bit with an if/else inside that which outputs special values |
| 07:51 | <&McMartin> | Well. It's easy in that it's one spell you incant, but it's not a trivial spelll. |
| 07:51 | <&[R]> | IIRC bash just provides the exit value in a special variable |
| 07:52 | <&[R]> | Which of course makes that entire thing heaps easier |
| 07:52 | <&[R]> | McMartin: I didn't need to capture each stream independantly |
| 07:52 | <&[R]> | Just the exit code and all output (stderr+stdout) |
| 07:54 | <&McMartin> | Right, there are some dumb things that Python (or C!) can burn you with if you're careless about that, though come to think of it, you don't need to feed it anything in stdin so the problem is ultimately self-solving |
| 07:54 | <&McMartin> | (If you need to send data in in response to a prompt from stdout, say, if you haven't drained stderr the program might be blocked on output *to* stderr and you'll both deadlock.) |
| 07:55 | <&[R]> | Yeah |
| 07:55 | <&McMartin> | (So you basically need a poll-select loop in C, and I think the master control routine in Python subsprocess is called "communicate") |
| 07:55 | <&[R]> | node.js is pretty lulzy about how it handles spawning a sub-process |
| 07:55 | <&McMartin> | Also can you tell I've been drilling for job interviews |
| 07:56 | <&[R]> | You basically have one option: here's a module, it will spawn your sub-process and give you three streams. Two are outputs, one is an input. Have fun. |
| 07:56 | <&[R]> | Which is nice if you want to actually take full advantage of that |
| 07:56 | <&[R]> | But sucks if you just really want something much simpler |
| 07:56 | <&McMartin> | Hm. node I/O is async, though, right? It won't hit this problem because when you try to write or read you're just taking a future back right away and the next one comes in as they are |
| 07:57 | <&McMartin> | My intuition is that this should suck less than poll/select |
| 07:57 | <&[R]> | Yeah, it's async |
| 07:57 | <&[R]> | Just the streams interfaces aren't super great |
| 07:57 | | * McMartin nods |
| 07:57 | <&[R]> | (Also their insanity actually varies between versions) |
| 07:58 | <&McMartin> | One of the things I learned from trying to do the Advent of Code stuff in C is that scanf is frickin' hax |
| 07:58 | <&[R]> | I've actually had to rewrite a module 5? times now because the stream behavior changed how it buffers shit |
| 07:59 | <&[R]> | At one point it was "we won't even start things until you hook up a handler", then it was "yeah, you have to tell us when you want to start the stream", then "you might want to tell us to pause the stream ASAP, then say go after you've setup handlers" |
| 08:00 | <&[R]> | Though that paticular library was a WTF to begin with |
| 08:01 | <&[R]> | It was actually two libraries, written by the same guy IIRC |
| 08:01 | <&[R]> | First one: generic FastCGI handler, one request provided three streams (guess what they were) |
| 08:02 | <&[R]> | Second one: PHP-fgi specific stuff, but that one would smash the stderr and stdout streams together, then provide you the result of that |
| 08:02 | <&[R]> | Except it also used that smashed together stream internally to handle reading headers |
| 08:03 | <&[R]> | Well, if PHP needs to bitch about something serious (like it can't find the file you asked for) it's going to write to stderr, then possibly write the headers |
| 08:03 | <&[R]> | Header parse code *really* did not understand that |
| 08:03 | <&[R]> | So it'd eat that error silently, then do something completely bizare |
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| 12:37 | < Yossarian> | oh I forgot about cdecl.c |
| 12:52 | < Yossarian> | Just asking out loud, what is the preferred formatting of tabs in a code document? |
| 12:57 | <~Vorntastic> | If you are using a major framework, follow its style guide. Otherwise do whatever the hell you want so long as you always do that |
| 13:00 | < Yossarian> | Go with the flow. Thoughts on softtabs spacing of 4? |
| 13:04 | <~Vorntastic> | It's fine |
| 13:07 | < Yossarian> | Minor details. That's one of my problems. |
| 13:08 | < Yossarian> | I'm interested in the details that don't even concern me. It's like, if I don't know how it all works I get nervous. |
| 13:09 | < Yossarian> | And sometimes details that might concern me so I can do proper error checking, I guess. |
| 13:21 | < Yossarian> | I'm having some memory problems remembering good advice I got here. I have to start taking my health more seriously. |
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| --- Log closed Tue Jun 02 00:00:38 2020 |