| --- Log opened Sat Jan 21 00:00:05 2017 |
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| 01:59 | <&[R]> | C question: memory leaks cannot occur once a process is killed/ended correct? IE: a memory leak can only exist while a process is actually mishandingling memory. |
| 02:00 | < catalyst> | Once the process has ended, the OS ought to reclaim the memory from it |
| 02:00 | < catalyst> | So it'll only persist if it was allocating a resource that the OS or another process manages |
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| 03:25 | <@celticminstrel> | I changed the batch file a little and now call is exiting with -1... |
| 03:26 | <@celticminstrel> | It seems to do everything it's supposed to despite this, but the -1 exit code makes MSVC complain. |
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| 04:33 | <@celticminstrel> | I have a variable $i which contains eg 0. I need to use that variable to reference variables of the form $var_0, $var1, etc. Is this possible in bash? |
| 04:34 | <@celticminstrel> | (If I were writing this myself I'd use an array, but sadly the variables are already set and I just want to loop over them.) |
| 04:40 | <@celticminstrel> | Cursory googling hints at "eval"... |
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| --- Log opened Sat Jan 21 09:36:14 2017 |
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| 19:53 | <@celticminstrel> | I thought "$FILE" was supposed to force it to be passed as a single parameter even if it contains spaces... but that doesn't seem to be working... |
| 20:04 | <&ToxicFrog> | celticminstrel: it will, but if you're doing stuff with (say) eval, or ssh, there may be multiple layers of quote stripping. |
| 20:04 | <&ToxicFrog> | Paste the code. |
| 20:05 | <&ToxicFrog> | also, instead of using eval, use !: |
| 20:06 | <&ToxicFrog> | [ben@thoth:~]$ var0="zero"; var1="one"; var2="two"; index=1; ptr="var${index}"; echo "${!ptr}" |
| 20:06 | <&ToxicFrog> | one |
| 20:08 | <@celticminstrel> | Just for the record, this is separate from the eval thing, which I already worked out. |
| 20:08 | <@celticminstrel> | grep -i 'something' "$FILE" |
| 20:08 | <@celticminstrel> | is giving errors related to spaces in file paths. |
| 20:08 | <@celticminstrel> | In my git pre-commit hook. |
| 20:09 | <&ToxicFrog> | Where does $FILE come from, and what exactly are the errors? |
| 20:09 | <&ToxicFrog> | Can you pastebin the entire hook? |
| 20:09 | <@celticminstrel> | It's a loop variable, and the errors are "no such file or directory" for partial paths. |
| 20:09 | <&ToxicFrog> | The problem is in the way you're iterating over the paths in the loop. |
| 20:10 | <@celticminstrel> | http://pastebin.com/Yi8daR4A |
| 20:10 | <&ToxicFrog> | Are you, perhaps, using `for FILE in $@` rather than `for FILE in "$@"`? |
| 20:10 | <@celticminstrel> | Hmm, that could make sense actually. |
| 20:10 | <@celticminstrel> | About the problem being in the loop header, I mean. |
| 20:10 | <&ToxicFrog> | Ok, yeah, the thing here is, `` (or $(), which you should be using instead) expands to a long string with whitespace in it |
| 20:11 | <&ToxicFrog> | "for x in y" splits y on whitespace |
| 20:11 | <&ToxicFrog> | *all* whitespace, not just newlines |
| 20:11 | <@celticminstrel> | Right. |
| 20:11 | <&ToxicFrog> | (this is a vast oversimplicification of globbing/iteration rules, but it gets the point across) |
| 20:11 | <&ToxicFrog> | Try instead using something like: |
| 20:12 | <&ToxicFrog> | git diff-index .... | cut ... | while read file; do ...stuff with file...; done |
| 20:12 | <&ToxicFrog> | "read" defaults to reading line-at-a-time. |
| 20:12 | | * celticminstrel was just reading something that says it should be read -r |
| 20:12 | <&ToxicFrog> | Aah. Yes. |
| 20:12 | <@celticminstrel> | Okay. |
| 20:12 | <&ToxicFrog> | I don't use it often enough to remember that, but it should be. |
| 20:13 | <@celticminstrel> | So the pipeline remains the same and then pipes further into while... |
| 20:13 | <&ToxicFrog> | You could also do something really quick and dirty, like "git diff-index --cached | grep redacted" just to see if it shows up in the diff anywhere |
| 20:13 | <&ToxicFrog> | If you're confident that no existing, committed files have it, and thus any appearance in the diff would mean it's getting added. |
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| 20:14 | <&ToxicFrog> | Yeah. |
| 20:14 | <&ToxicFrog> | 'read x' reads a line from stdin into $x; if stdin EOFs, it exits with failure, terminating the loop. |
| 20:14 | <@celticminstrel> | Alright, works now. \o/ |
| 20:15 | <@celticminstrel> | I did end up using eval for the other thing. |
| 20:15 | <@celticminstrel> | And even committed it already. |
| 20:15 | <&ToxicFrog> | You monster~ |
| 20:15 | <@celticminstrel> | It works, and I don't feel like changing it now just on principle. |
| 20:16 | <@celticminstrel> | That ! is the "history" operator, right? |
| 20:16 | <@celticminstrel> | Or does it have a different meaning in substitutions? |
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| 20:29 | <&ToxicFrog> | The latter. |
| 20:29 | <&ToxicFrog> | ${!foo |
| 20:29 | <&ToxicFrog> | ${!foo} is "evaluate $foo, then use that as a variable name and expand to the contents of that variable" |
| 20:30 | <&ToxicFrog> | Its disadvantage over eval is that it's less portable to other shells. |
| 20:30 | <&ToxicFrog> | Its advantage is that it doesn't break messily if $foo contains weirdnesses. |
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| 21:22 | | * McMartin implements the Smoking Clover algorithm. |
| 21:23 | <&McMartin> | Either 320x200 is too small a value for an acceptable result or I am implementing this algorithm incorrectly. |
| 21:24 | <~Vornicus> | 320x200 should be fine. |
| 21:24 | <~Vornicus> | what's it doing? |
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| 21:27 | <&McMartin> | Producing a graphical result that looks nothing like the images described. |
| 21:27 | <&McMartin> | Maybe if I treat it as a much larger area and then clip results to inside the window... |
| 21:28 | <&McMartin> | Or rather: "Producing a graphical result that is clearly the correct one given the orders I have given it, but which are clearly not the screenshots shown elsenet for the effect" |
| 21:28 | <&McMartin> | That means the English description is oversimplifying. |
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| 21:55 | <&McMartin> | OK, I think I've got it. |
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| 22:01 | <&McMartin> | You have to graph an octant of x^2+y^2=r^2 with r larger than the screen's largest axis, and you need to do it with a constantly increasing x or y (whichever gives you a continuous line in that octant) |
| 22:01 | <&McMartin> | Otherwise you get something that looks more like a moire tunnel than a cloverleaf effect. |
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| 23:12 | <&McMartin> | https://hkn.eecs.berkeley.edu/~mcmartin/screenshots/clover_000.png |
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| --- Log closed Sun Jan 22 00:00:07 2017 |