In chapter 5 in RWH, they show you how to create, configure, and install a package. This is the final step: ...mypretty$ runghc Setup install Installing: /usr/local/lib/mypretty-0.1/ghc-6.8.2 Setup: /usr/local/lib/mypretty-0.1: createDirectory: permission denied (Permission denied) .../mypretty$ sudo runghc Setup install Password: Installing: /usr/local/lib/mypretty-0.1/ghc-6.8.2 Registering mypretty-0.1... Reading package info from "dist/installed-pkg-config" ... done. Saving old package config file... done. Writing new package config file... done. $ ghc-pkg list /usr/local/lib/ghc-6.8.2/package.conf: Cabal-1.2.3.0, GLUT-2.1.1.1, HUnit-1.2.0.0, OpenAL-1.3.1.1, OpenGL-2.2.1.1, QuickCheck-1.1.0.0, array-0.1.0.0, base-3.0.1.0, bytestring-0.9.0.1, cgi-3001.1.5.1, containers-0.1.0.1, directory-1.0.0.0, fgl-5.4.1.1, filepath-1.1.0.0, (ghc-6.8.2), haskell-src-1.0.1.1, haskell98-1.0.1.0, hpc-0.5.0.0, html-1.0.1.1, mtl-1.1.0.0, mypretty-0.1, network-2.1.0.0, old-locale-1.0.0.0, old-time-1.0.0.0, packedstring-0.1.0.0, parallel-1.0.0.0, parsec-2.1.0.0, pretty-1.0.0.0, process-1.0.0.0, random-1.0.0.0, readline-1.0.1.0, regex-base-0.72.0.1, regex-compat-0.71.0.1, regex-posix-0.72.0.2, rts-1.0, stm-2.1.1.0, template-haskell-2.2.0.0, time-1.1.2.0, unix-2.3.0.0, xhtml-3000.0.2.1 The mypretty package is in that list. But what does that do for me? How do I access that package? The .cabal file has this text in it: library Exposed-Modules: SimpleJSON PrettyJSON Prettify Build-Depends: base >= 2.0 But I created a Main.hs file that imported the "exposed modules": module Main () where import Prettify import PrettyJSON import SimpleJSON main = let s = JString "hello world" aDoc = renderJValue s in printPrettified aDoc --JString is a JValue value constructor and JValue is defined in SimpleJSON.hs --renderJVAlue is a function defined in PrettyJSON.hs, and it returns a data type that is defined in Prettify.js --printPrettified is a function defined in PrettyJSON.hs This is what happens: $ ghc -c Main.hs ~/2testing/dir3$ ghc -o test Main.hs compilation IS NOT required /usr/libexec/gcc/i686-apple-darwin8/4.0.1/ld: warning -F: directory name (/Users/me/Library/Frameworks) does not exist /usr/libexec/gcc/i686-apple-darwin8/4.0.1/ld: Undefined symbols: ___stginit_myprettyzm0zi1_Prettify_ ___stginit_myprettyzm0zi1_PrettyJSON_ ___stginit_myprettyzm0zi1_SimpleJSON_ _myprettyzm0zi1_PrettyJSON_printPrettified_closure _myprettyzm0zi1_PrettyJSON_renderJValue_closure _myprettyzm0zi1_SimpleJSON_JString_static_info collect2: ld returned 1 exit status I googled cabal tutorials, but I can't find anything that tells me how to access an installed package.
On 2009 Mar 28, at 2:35, 7stud wrote:
$ ghc -c Main.hs ~/2testing/dir3$ ghc -o test Main.hs
If you're not using the cabal framework to build your program, you want to use "ghc --make" so it will chase down the package dependencies. Otherwise you would need to say "ghc -package mypretty". -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH
Brandon S. Allbery KF8NH
On 2009 Mar 28, at 2:35, 7stud wrote:
$ ghc -c Main.hs ~/2testing/dir3$ ghc -o test Main.hs
If you're not using the cabal framework to build your program,
I thought I was.
you want to use "ghc --make" so it will chase down the package dependencies. Otherwise you would need to say "ghc -package mypretty".
Based on what I did to install the package, how am I supposed to use the package in a program? The book doesn't give any clue.
On 2009 Mar 28, at 3:40, 7stud wrote:
Brandon S. Allbery KF8NH
writes: On 2009 Mar 28, at 2:35, 7stud wrote:
$ ghc -c Main.hs ~/2testing/dir3$ ghc -o test Main.hs
If you're not using the cabal framework to build your program,
I thought I was.
You used it to build your package. You're using ghc directly to build your program, not doing "runhaskell Setup.hs build" or "cabal install".
you want to use "ghc --make" so it will chase down the package dependencies. Otherwise you would need to say "ghc -package mypretty".
Based on what I did to install the package, how am I supposed to use the package in a program? The book doesn't give any clue.
That is exactly what you just quoted. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH
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Brandon S. Allbery KF8NH