On Mon, Aug 06, 2007 at 06:04:41PM -0300, Isaac Dupree wrote:
Thomas Schilling wrote:
On 6 aug 2007, at 12.26, Neil Mitchell wrote:
.... = os == "mingw"
This is wrong on so many levels!
I agree, but
Proposal:
Add System.Info.isWindows :: Bool
is hardly better, because this opens the door to political issues (why not have isLinux, isFreeBSD, isNetBSD, ...?) And I'm not even sure returning True for every Windows incarnation is the right thing in most use cases. In general you want to test for APIs--not the OS per se.
Like it or not, Windows is a very significant, special case, where programs often transform themselves, more than they need to, based on a simple judgment of whether they're on "windows" or not, even when POSIX APIs are available, etc., etc. ***I don't like it either.*** But defining APIs is hard work, Windows is in practice much different from almost anything else, much more important, and many of us aren't interested in expending too much hard work to support (flexibly, in detail,) stupid closed-source platforms. Developers tend to want to check for isWindows anyway: they already do, with os=="mingw" and other hacks. ***I think isWindows is necessary, at least as a intermediate solution***... if someone makes more, API-specific queries sometime, then it will be easier to search existing code for the unified "isWindows" and find everywhere that might be improved.
Yes. I agree, I wouldn't want to see an enumerated data type, because you really want to query features the environment supports, not necessarily what OS. (like, ReactOS provides the win32 api) so, I'd actually like to see two isWindows :: Bool isPosix :: Bool where they say whether the given APIs are available (to some reasonable approximation). for instance, windows under mingw would be True,False, while windows under cygwin would be True,True and linux would be False,True. This covers the 'special' cases that most people have to worry about. I have nothing against a more complete API, but these two special cases are common and important enough that I think they should have special support. John -- John Meacham - ⑆repetae.net⑆john⑈