Re: Disallow pushing of new trailing whitespace
The problem with these kind of commit-time checks is that you only find out the problem *after* you've validated your nicely polished commits. This is easily solved by adding this line to .emacs file: (add-hook 'before-save-hook 'delete-trailing-whitespace) No more trailing whitespaces. Ever. On the other hand problem with NOT having these kind of checks is that I'm seeing some trailing whitespaces appearing in modules that I have cleaned from trailing whitespaces! Which means that I have to spend time with `git add -i` and separating whitespace changes from other changes (or ignore policy about whitespace changes going in a separate commit). Janek ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
Re: Disallow pushing of new trailing whitespace
The problem with this approach is that if a file already contains trailing whitespace, you'll introduce spurious changes in your commit. I wouldn't call it a problem, but a feature - provided that you put whitespace changes in a separate commit. In this way we would gradually get rid of all trailing whitespaces and live happily ever after. Right now I'm facing a dilemma whether I should use mentioned emacs setting or not. If I do use it, I end up removing lots of whitespaces simply when I edit files (and I'm fine with that), but I don't know if there's any point in doing this if they keep reappearing. I can then disable this setting, but I know I'll end up adding even more whitespaces to the source code and I don't think that's a good thing to do. Janek ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
Re: Disallow pushing of new trailing whitespace
There's some justification for -fwarn-tabs: tabs can lead to confusing failures when people use the wrong tab setting in their editor. On the other hand, I don't think there's any good reason for having the compiler warn about trailing whitespace. Cheers, Simon On 22/08/13 17:18, Edward Z. Yang wrote: GHC already has -fwarn-tabs; we could have -fwarn-trailing-whitespace and turn it on by default, so that validate errors on it but you also notice it when you're doing a build (if you're paying attention to warnings). Edward Excerpts from Simon Marlow's message of Thu Aug 22 05:04:50 -0700 2013: On 22/08/13 12:32, Austin Seipp wrote: This seems acceptable IMO. The general working conventions already are to separate whitespace and/or tab changes from a commit containing actual content. If you ./validate cleanly, but the server rejects the push for whitespace, adding an extra commit on top to clean up the affected files seems very sensible (it's simple to 'untabify' and eliminate trailing white space in most editors these days, so I imagine this isn't really going to cost you a lot of time.) You still have to validate the new commit, so it costs you at least 20 mins, which is a lot. I also add bonus points for the fact the server will reject it unless you clean up *all* affected files you touched, so things can't slip by. This is how the tab check works now, and it does deal with a 'range' of commits where later commits eliminate tabs introduced in earlier ones. We'd also have to introduce the concept of git into ./validate for this to work (and add the ability to specify a commit range for stuff like this,) but a basic implementation may not be difficult, looking at the pre-receive script. Checking everything in 'git rev-list origin..' is probably good enough. Cheers, Simon Alternatively, these could be pre-commit hooks in the developer repository, but I believe you have to opt into that. Maybe worth putting on the wiki, though. On Thu, Aug 22, 2013 at 2:33 AM, Simon Marlow marlo...@gmail.com mailto:marlo...@gmail.com wrote: On 20/08/13 12:21, Geoffrey Mainland wrote: Would be nice to have. How about a third hook that disallows commits that include whitespace-only changes unless *all* changes are whitespace-only? ;) The problem with these kind of commit-time checks is that you only find out the problem *after* you've validated your nicely polished commits. If we're going to add more checks on commits they should be done by validate (yes I know that's not at all trivial, but it's not impossible either). Cheers, Simon Geoff On 08/20/2013 10:59 AM, Jan Stolarek wrote: Right now we have a git hook that prevents pushing a file containing tabs, unless that file had them already (in other words: no new files with tabs in our repos). I propose to add similar hook for trailing whitespaces. Herbert says he can implement that. What do others think? Would you find that useful or problematic? Janek _ ghc-devs mailing list ghc-devs@haskell.org mailto:ghc-devs@haskell.org http://www.haskell.org/__mailman/listinfo/ghc-devs http://www.haskell.org/mailman/listinfo/ghc-devs _ ghc-devs mailing list ghc-devs@haskell.org mailto:ghc-devs@haskell.org http://www.haskell.org/__mailman/listinfo/ghc-devs http://www.haskell.org/mailman/listinfo/ghc-devs -- Regards, Austin - PGP: 4096R/0x91384671 ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
Re: Disallow pushing of new trailing whitespace
On 20/08/13 12:21, Geoffrey Mainland wrote: Would be nice to have. How about a third hook that disallows commits that include whitespace-only changes unless *all* changes are whitespace-only? ;) The problem with these kind of commit-time checks is that you only find out the problem *after* you've validated your nicely polished commits. If we're going to add more checks on commits they should be done by validate (yes I know that's not at all trivial, but it's not impossible either). Cheers, Simon Geoff On 08/20/2013 10:59 AM, Jan Stolarek wrote: Right now we have a git hook that prevents pushing a file containing tabs, unless that file had them already (in other words: no new files with tabs in our repos). I propose to add similar hook for trailing whitespaces. Herbert says he can implement that. What do others think? Would you find that useful or problematic? Janek ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
Re: Disallow pushing of new trailing whitespace
This seems acceptable IMO. The general working conventions already are to separate whitespace and/or tab changes from a commit containing actual content. If you ./validate cleanly, but the server rejects the push for whitespace, adding an extra commit on top to clean up the affected files seems very sensible (it's simple to 'untabify' and eliminate trailing white space in most editors these days, so I imagine this isn't really going to cost you a lot of time.) I also add bonus points for the fact the server will reject it unless you clean up *all* affected files you touched, so things can't slip by. This is how the tab check works now, and it does deal with a 'range' of commits where later commits eliminate tabs introduced in earlier ones. We'd also have to introduce the concept of git into ./validate for this to work (and add the ability to specify a commit range for stuff like this,) but a basic implementation may not be difficult, looking at the pre-receive script. Alternatively, these could be pre-commit hooks in the developer repository, but I believe you have to opt into that. Maybe worth putting on the wiki, though. On Thu, Aug 22, 2013 at 2:33 AM, Simon Marlow marlo...@gmail.com wrote: On 20/08/13 12:21, Geoffrey Mainland wrote: Would be nice to have. How about a third hook that disallows commits that include whitespace-only changes unless *all* changes are whitespace-only? ;) The problem with these kind of commit-time checks is that you only find out the problem *after* you've validated your nicely polished commits. If we're going to add more checks on commits they should be done by validate (yes I know that's not at all trivial, but it's not impossible either). Cheers, Simon Geoff On 08/20/2013 10:59 AM, Jan Stolarek wrote: Right now we have a git hook that prevents pushing a file containing tabs, unless that file had them already (in other words: no new files with tabs in our repos). I propose to add similar hook for trailing whitespaces. Herbert says he can implement that. What do others think? Would you find that useful or problematic? Janek __**_ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/**mailman/listinfo/ghc-devshttp://www.haskell.org/mailman/listinfo/ghc-devs __**_ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/**mailman/listinfo/ghc-devshttp://www.haskell.org/mailman/listinfo/ghc-devs -- Regards, Austin - PGP: 4096R/0x91384671 ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
Re: Disallow pushing of new trailing whitespace
GHC already has -fwarn-tabs; we could have -fwarn-trailing-whitespace and turn it on by default, so that validate errors on it but you also notice it when you're doing a build (if you're paying attention to warnings). Edward Excerpts from Simon Marlow's message of Thu Aug 22 05:04:50 -0700 2013: On 22/08/13 12:32, Austin Seipp wrote: This seems acceptable IMO. The general working conventions already are to separate whitespace and/or tab changes from a commit containing actual content. If you ./validate cleanly, but the server rejects the push for whitespace, adding an extra commit on top to clean up the affected files seems very sensible (it's simple to 'untabify' and eliminate trailing white space in most editors these days, so I imagine this isn't really going to cost you a lot of time.) You still have to validate the new commit, so it costs you at least 20 mins, which is a lot. I also add bonus points for the fact the server will reject it unless you clean up *all* affected files you touched, so things can't slip by. This is how the tab check works now, and it does deal with a 'range' of commits where later commits eliminate tabs introduced in earlier ones. We'd also have to introduce the concept of git into ./validate for this to work (and add the ability to specify a commit range for stuff like this,) but a basic implementation may not be difficult, looking at the pre-receive script. Checking everything in 'git rev-list origin..' is probably good enough. Cheers, Simon Alternatively, these could be pre-commit hooks in the developer repository, but I believe you have to opt into that. Maybe worth putting on the wiki, though. On Thu, Aug 22, 2013 at 2:33 AM, Simon Marlow marlo...@gmail.com mailto:marlo...@gmail.com wrote: On 20/08/13 12:21, Geoffrey Mainland wrote: Would be nice to have. How about a third hook that disallows commits that include whitespace-only changes unless *all* changes are whitespace-only? ;) The problem with these kind of commit-time checks is that you only find out the problem *after* you've validated your nicely polished commits. If we're going to add more checks on commits they should be done by validate (yes I know that's not at all trivial, but it's not impossible either). Cheers, Simon Geoff On 08/20/2013 10:59 AM, Jan Stolarek wrote: Right now we have a git hook that prevents pushing a file containing tabs, unless that file had them already (in other words: no new files with tabs in our repos). I propose to add similar hook for trailing whitespaces. Herbert says he can implement that. What do others think? Would you find that useful or problematic? Janek _ ghc-devs mailing list ghc-devs@haskell.org mailto:ghc-devs@haskell.org http://www.haskell.org/__mailman/listinfo/ghc-devs http://www.haskell.org/mailman/listinfo/ghc-devs _ ghc-devs mailing list ghc-devs@haskell.org mailto:ghc-devs@haskell.org http://www.haskell.org/__mailman/listinfo/ghc-devs http://www.haskell.org/mailman/listinfo/ghc-devs -- Regards, Austin - PGP: 4096R/0x91384671 ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
Disallow pushing of new trailing whitespace
Right now we have a git hook that prevents pushing a file containing tabs, unless that file had them already (in other words: no new files with tabs in our repos). I propose to add similar hook for trailing whitespaces. Herbert says he can implement that. What do others think? Would you find that useful or problematic? Janek ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
Re: Disallow pushing of new trailing whitespace
Would be nice to have. How about a third hook that disallows commits that include whitespace-only changes unless *all* changes are whitespace-only? ;) Geoff On 08/20/2013 10:59 AM, Jan Stolarek wrote: Right now we have a git hook that prevents pushing a file containing tabs, unless that file had them already (in other words: no new files with tabs in our repos). I propose to add similar hook for trailing whitespaces. Herbert says he can implement that. What do others think? Would you find that useful or problematic? Janek ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
Re: Disallow pushing of new trailing whitespace
On 2013-08-20 at 13:21:02 +0200, Geoffrey Mainland wrote: How about a third hook that disallows commits that include whitespace-only changes unless *all* changes are whitespace-only? ;) The other two validations were about preserving an invariant (file has no tabs file has no trailing whitespace) and more or less simple to decide; ...whereas your suggestion seems problematic as it's difficult to know whether a whitespace change to a Haskell program has semantic meaning; for example, how should the script detect that the following whitespace modification... --- main.hs 2013-08-20 14:53:34.119960468 +0200 +++ main2.hs2013-08-20 14:53:43.295960294 +0200 @@ -1,5 +1,5 @@ foo x = do putStrLn foo when x $ do putStrLn bar - putStrLn doo +putStrLn doo ...is actually a semantic change? Cheers, hvr ___ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
