On 11-02-25 05:40 AM, Michael Snoyman wrote:
Some of the dependencies for Yesod (such as haskell-src) require
happy. For the "Yesod in Five Minutes" page[1], I've given
instructions to cabal install happy and then cabal install yesod.
However, as Xavier Shay pointed out to me, this won't actually work on
a vanilla install, since happy gets installed in the cabal bin folder,
which is not by default on the PATH. Two questions:
* Should we document this somewhere in the Haskell Platform install
process? I'm sure many old-time users of cabal are well aware that
they need ~/.cabal/bin in the PATH, but new users will not be.
The need to mention ~/.cabal/bin belongs to the empty user guide of
cabal-install.
Haskell Platform includes happy; I wonder why one would "cabal install
happy" after having Haskell Platform.
Haskell Platform normally puts happy in
case os of
Windows Vista -> \Program Files (x86)\Haskell
Platform\version\lib\extralibs\bin
MacOS X -> I don't know, but still not ~/.cabal/bin
Linux -> case how you obtained of
Your Linux Distro -> /usr/bin
Built From Source -> /usr/local/bin
Haskell Platform could put happy in ~/.cabal/bin but would require
non-default tinkering.
Since Haskell Platform includes cabal-install, the empty user guide of
Haskell Platform should talk about ~/.cabal/bin, yes. But this is
because the empty user guide of Haskell Platform is the union of the
user guides of members such as cabal-install. In other words, fixing it
in the empty Haskell Platform user guide without fixing it in the empty
cabal-install user guide fixes only half of the problem.
I would
also like to update Yesod's documentation; does anyone have standard
phrasing that is applicable to all operating systems?
case os of
Windows Vista -> \Users\username\AppData\Roaming\cabal\bin
MacOS X -> ~/.cabal/bin
Linux -> ~/.cabal/bin
* Should we consider modifying the build tools to automatically look
for build dependencies in the cabal bin folder?
Fixing build tools (such as cabal-install itself) to secretly search
~/.cabal/bin fixes only half of the problem. So cabal-install can find
happy somewhere, great; but I cannot find it, and perhaps I want to use
it outside of cabal-install.
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