Re: Good Haskell Style

Jon Fairbairn wrote:

Benjamin Franksen writes:

...

Jon Fairbairn wrote:

...

David Roundy writes:

...

I've certainly never heard of a scenario in which trailing white space is beneficial.

Neither have I, but since it's invisible, asking that it not be there without providing automatic mechanical assistance is to add a tedious burden.

sed -e 's/[ \t]+$//'

Not the whole story, surely;

No, of course not.

you must want me to do

I don't want you to do anything at all. I merely wanted to illustrate that getting rid of trailing whitespace is easily automated. Well, let's say half-automated: you still need to push the button.

something like create sort-it:

#!/bin/bash find /home/jf -name \*.hs -o -name \*.lhs | xargs -IX sed -i.bak -e 's/[ \t]+$//' X

and put it in a my crontab to run once a day? Otherwise it's not automatic.

No crontab entry needed here (wouldn't help, by the way, since you probably want to record on the same day you wrote something). Also not necessary to recurse over whole home directory. It needs to be done only right before darcs-record-ing changes and only for the standard libraries. As has been noted by someone else, darcs even helps you by highlighting trailing whitespace in hunks, in case you forgot to run your script over the source files. I agree that a darcs prehook (if they existed) would be an even nicer solution.

Only, strangely enough, what you wrote doesn't work (s/-e/-r/).

Sorry, I didn't test the code. Forgot to add the usual disclaimer... ;-) (Always bugs me that sed and grep have these half-regexes as default.) Cheers Ben