Re: [Haskell-cafe] ghc -e
On Wed, 6 Jan 2010, Gwern Branwen wrote: On Wed, Jan 6, 2010 at 7:23 PM, Tony Morris tonymor...@gmail.com wrote: ghc -e import Control.Monad; forM [[1,2,3]] reverse As of 6.10.2, the bug whereby the GHC API lets you use functions from anywhere just by naming them (Java-style) has not been fixed: $ ghc -e Control.Monad.forM [[1,2,3]] reverse package flags have changed, resetting and loading new packages... Why is this a bug? This is the intended behaviour in GHCi and you can include and exclude packages with -package and -hide-package options, respectively. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ghc -e
Can I import a module when using ghc -e? e.g. ghc -e import Control.Monad; forM [[1,2,3]] reverse -- Tony Morris http://tmorris.net/ ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ghc -e
On Wed, Jan 6, 2010 at 7:23 PM, Tony Morris tonymor...@gmail.com wrote: ghc -e import Control.Monad; forM [[1,2,3]] reverse As of 6.10.2, the bug whereby the GHC API lets you use functions from anywhere just by naming them (Java-style) has not been fixed: $ ghc -e Control.Monad.forM [[1,2,3]] reverse package flags have changed, resetting and loading new packages... interactive:1:25: Warning: Defaulting the following constraint(s) to type `Integer' `Num t' arising from the literal `3' at interactive:1:25 In the expression: 3 In the expression: [1, 2, 3] In the first argument of `forM', namely `[[1, 2, 3]]' interactive:1:25: Warning: Defaulting the following constraint(s) to type `Integer' `Num t' arising from the literal `3' at interactive:1:25 In the expression: 3 In the expression: [1, 2, 3] In the first argument of `forM', namely `[[1, 2, 3]]' [[3],[2],[1]] it :: [[Integer]] (0.01 secs, 1710984 bytes) -- gwern ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ghc -e
Gwern Branwen wrote: On Wed, Jan 6, 2010 at 7:23 PM, Tony Morris tonymor...@gmail.com wrote: ghc -e import Control.Monad; forM [[1,2,3]] reverse As of 6.10.2, the bug whereby the GHC API lets you use functions from anywhere just by naming them (Java-style) has not been fixed: $ ghc -e Control.Monad.forM [[1,2,3]] reverse package flags have changed, resetting and loading new packages... interactive:1:25: Warning: Defaulting the following constraint(s) to type `Integer' `Num t' arising from the literal `3' at interactive:1:25 In the expression: 3 In the expression: [1, 2, 3] In the first argument of `forM', namely `[[1, 2, 3]]' interactive:1:25: Warning: Defaulting the following constraint(s) to type `Integer' `Num t' arising from the literal `3' at interactive:1:25 In the expression: 3 In the expression: [1, 2, 3] In the first argument of `forM', namely `[[1, 2, 3]]' [[3],[2],[1]] it :: [[Integer]] (0.01 secs, 1710984 bytes) I see the same on GHC 6.10.4. $ ghc -e Control.Monad.forM [[1,2,3]] reverse [[3],[2],[1]] What would it be fixed to? What is wrong with how it is? -- Tony Morris http://tmorris.net/ ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ghc -e
On Thu, Jan 07, 2010 at 10:23:35AM +1000, Tony Morris wrote: Can I import a module when using ghc -e? e.g. ghc -e import Control.Monad; forM [[1,2,3]] reverse One option is to create a file imports.hs which contains the text import Control.Monad, and then run ghc -e forM [[1,2,3]] reverse imports.hs I use this method in a short shell script interact so that I can apply Haskell functions to files from the command line and don't have to type the full qualified names of things in modules I use frequently. Regards, Reid Barton ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ghc -e
On Wed, Jan 6, 2010 at 7:35 PM, Tony Morris tonymor...@gmail.com wrote: Gwern Branwen wrote: On Wed, Jan 6, 2010 at 7:23 PM, Tony Morris tonymor...@gmail.com wrote: ghc -e import Control.Monad; forM [[1,2,3]] reverse As of 6.10.2, the bug whereby the GHC API lets you use functions from anywhere just by naming them (Java-style) has not been fixed: $ ghc -e Control.Monad.forM [[1,2,3]] reverse package flags have changed, resetting and loading new packages... interactive:1:25: Warning: Defaulting the following constraint(s) to type `Integer' `Num t' arising from the literal `3' at interactive:1:25 In the expression: 3 In the expression: [1, 2, 3] In the first argument of `forM', namely `[[1, 2, 3]]' interactive:1:25: Warning: Defaulting the following constraint(s) to type `Integer' `Num t' arising from the literal `3' at interactive:1:25 In the expression: 3 In the expression: [1, 2, 3] In the first argument of `forM', namely `[[1, 2, 3]]' [[3],[2],[1]] it :: [[Integer]] (0.01 secs, 1710984 bytes) I see the same on GHC 6.10.4. $ ghc -e Control.Monad.forM [[1,2,3]] reverse [[3],[2],[1]] What would it be fixed to? What is wrong with how it is? Presumably one then have to use some sort of flag to ask for Control.Monad specifically to be visible. What's wrong with it is that this is not merely GHCi behavior, this is universal GHC API behavior and wildly insecure: http://hackage.haskell.org/trac/ghc/ticket/2452 -- gwern ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ghc -e
On Wed, Jan 6, 2010 at 6:15 PM, Reid Barton rwbar...@math.harvard.eduwrote: On Thu, Jan 07, 2010 at 10:23:35AM +1000, Tony Morris wrote: Can I import a module when using ghc -e? e.g. ghc -e import Control.Monad; forM [[1,2,3]] reverse One option is to create a file imports.hs which contains the text import Control.Monad, and then run ghc -e forM [[1,2,3]] reverse imports.hs I use this method in a short shell script interact so that I can apply Haskell functions to files from the command line and don't have to type the full qualified names of things in modules I use frequently. Did you know you can put commands in $HOME/.ghci that will be loaded every time you run ghci? So, if you have modules that you commonly use put something like: :m + Control.Monad In your $HOME/.ghci file and then you can use ghci instead of this ghc -e trick. HTH, Jason ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ghc -e with standard input
Hi, Is there a way to run 'ghc -e' taking input from standard input? I would like to use it in a pipe. Thanks, Maurício ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ghc -e with standard input
On Nov 5, 2007 1:46 PM, Maurício [EMAIL PROTECTED] wrote: Hi, Is there a way to run 'ghc -e' taking input from standard input? I would like to use it in a pipe. xargs ought to do the trick nicely. -Brent ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ghc -e with standard input
On Nov 5, 2007 1:46 PM, Maurício [EMAIL PROTECTED] wrote: Hi, Is there a way to run 'ghc -e' taking input from standard input? I would like to use it in a pipe. It seems to me that you can use getContents, et. al., as you would from any other Haskell program: $ echo hello there mauricio | ghc -e print = (Control.Monad.liftM (reverse . words)) getContents [mauricio,there,hello] G ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
