[Haskell-cafe] [Haskell-community] technical thoughts on stack

Wed Sep 14 20:26:26 UTC 2016

That's not what I'm observering.  I intentially put -Wall and some odd code
in a local copy of pipes-csv, stack clean, stack build.

/home/toad/working/pipes-csv-1.4.0/src/Pipes/Csv.hs:216:3: Warning:
    A do-notation statement discarded a result of type ‘String’
    Suppress this warning by saying ‘_ <- getLine’
    or by using the flag -fno-warn-unused-do-bind

In another project, stack clean, stack build

pipes-csv-1.4.0: configure
pipes-csv-1.4.0: build
pipes-csv-1.4.0: copy/register

Nothing at all.

stack.yaml is basically this, but with a few extra packages.

flags: {}
packages:
- '.'
- '../pipes-csv-1.4.0'
extra-deps: []
resolver: lts-3.1

stack --version
Version 1.1.2 x86_64 hpack-0.14.0

On Wed, Sep 14, 2016 at 4:10 PM, Christopher Allen <cma at bitemyapp.com>
wrote:

> I see what is meant now, but it's not really applicable. If I am
> co-developing a package and its dependencies, I add them as packages
> (not deps) to my stack.yaml and still get the warnings.
>
> Example:
>
> From the stack.yaml for the package that uses my previous example's
> library:
>
>
> packages:
> - '.'
> - ../simple-library
>
>
> Then stack build'ing the project (uses-sl) that depends on
> simple-library which as a module with a warning:
>
>
> $ stack build
> simple-library-0.1.0.0: build
> Progress: 1/2
> --  While building package simple-library-0.1.0.0 using:
>       /home/callen/.stack/setup-exe-cache/x86_64-linux/setup-
> Simple-Cabal-1.24.0.0-ghc-8.0.1
> --builddir=.stack-work/dist/x86_64-linux/Cabal-1.24.0.0 build
> lib:simple-library exe:simple-library-exe --ghc-options " -ddump-hi
> -ddump-to-file"
>     Process exited with code: ExitFailure 1
>     Logs have been written to:
> /home/callen/work/uses-sl/.stack-work/logs/simple-library-0.1.0.0.log
>
>     Preprocessing library simple-library-0.1.0.0...
>     [1 of 1] Compiling SimpleLib        ( src/SimpleLib.hs,
> .stack-work/dist/x86_64-linux/Cabal-1.24.0.0/build/SimpleLib.o )
>
>     /home/callen/work/simple-library/src/SimpleLib.hs:7:3: warning:
> [-Wunused-do-bind]
>         A do-notation statement discarded a result of type ‘[Char]’
>         Suppress this warning by saying ‘_ <- return "hello"’
>
>
>
> One of the first things I did when figuring out Stack was to look at
> how Yesod used it:
> https://github.com/yesodweb/yesod/blob/master/stack.yaml
>
> On Wed, Sep 14, 2016 at 2:56 PM, David McBride <toad3k at gmail.com> wrote:
> > The rule of thumb seems to be, if you do a stack build and it decides to
> > build multiple packages, it hides this log info.
> >
> > I understand why it does that, I should be able to build lens without
> > worrying about tons of spurious output, but at the same time it is common
> > for me to have an entire tree of packages I'm developing and it often
> > obscures errors that are happening in my own packages.  At the very
> least,
> > if it is only building local packages, I'd very much like to see that
> > output.
> >
> > On Wed, Sep 14, 2016 at 3:42 PM, Patrick Pelletier
> > <code at funwithsoftware.org> wrote:
> >>
> >> On 9/14/16 12:21 PM, Christopher Allen wrote:
> >>>
> >>> What are you talking about?
> >>>
> >>> $ stack build
> >>> simple-library-0.1.0.0: unregistering (local file changes: src/Lib.hs)
> >>> simple-library-0.1.0.0: build
> >>> Preprocessing library simple-library-0.1.0.0...
> >>> [1 of 1] Compiling Lib              ( src/Lib.hs,
> >>> .stack-work/dist/x86_64-linux/Cabal-1.24.0.0/build/Lib.o )
> >>>
> >>> /home/callen/work/simple-library/src/Lib.hs:7:3: warning:
> >>> [-Wunused-do-bind]
> >>>      A do-notation statement discarded a result of type ‘[Char]’
> >>>      Suppress this warning by saying ‘_ <- return "woot"’
> >>> Preprocessing executable 'simple-library-exe' for
> >>> simple-library-0.1.0.0...
> >>
> >>
> >> Weird.  That's not how it works for me:
> >>
> >> whiteandnerdy:normalize ppelleti$ stack build
> >> normalization-insensitive-2.0: unregistering (local file changes:
> >> Data/Unicode/NormalizationInsensitive.hs
> >> Data/Unicode/NormalizationInsensitive/Internal.hs)
> >> normalization-insensitive-2.0: configure
> >> normalization-insensitive-2.0: build
> >> normalization-insensitive-2.0: copy/register
> >> photos-0.1.0.0: configure
> >> photos-0.1.0.0: build
> >> photos-0.1.0.0: copy/register
> >> Completed 2 action(s).
> >> whiteandnerdy:normalize ppelleti$ cat
> >> .stack-work/logs/normalization-insensitive-2.0.log
> >> Configuring normalization-insensitive-2.0...
> >> Preprocessing library normalization-insensitive-2.0...
> >> [1 of 3] Compiling Data.Unicode.NormalizationInsensitive.Internal (
> >> Data/Unicode/NormalizationInsensitive/Internal.hs,
> >> .stack-work/dist/x86_64-osx/Cabal-1.22.5.0/build/Data/Unicode/
> NormalizationInsensitive/Internal.o
> >> )
> >>
> >> Data/Unicode/NormalizationInsensitive/Internal.hs:30:1: Warning:
> >>     The import of ‘Data.Bool’ is redundant
> >>       except perhaps to import instances from ‘Data.Bool’
> >>     To import instances alone, use: import Data.Bool()
> >>
> >> Data/Unicode/NormalizationInsensitive/Internal.hs:38:1: Warning:
> >>     The import of ‘otherwise, &&, <=, +’
> >>     from module ‘Prelude’ is redundant
> >>
> >> Data/Unicode/NormalizationInsensitive/Internal.hs:57:1: Warning:
> >>     Module ‘Data.ByteString.UTF8.Normalize’ is deprecated:
> >>       Convert ByteString to Text and then normalize
> >>
> >> Data/Unicode/NormalizationInsensitive/Internal.hs:135:1: Warning:
> >>     Top-level binding with no type signature: mode :: NormalizationMode
> >>
> >> Data/Unicode/NormalizationInsensitive/Internal.hs:143:17: Warning:
> >>     In the use of ‘B.normalize’
> >>     (imported from Data.ByteString.UTF8.Normalize):
> >>     Deprecated: "Convert ByteString to Text and then normalize"
> >>
> >> Data/Unicode/NormalizationInsensitive/Internal.hs:147:33: Warning:
> >>     In the use of ‘B.normalize’
> >>     (imported from Data.ByteString.UTF8.Normalize):
> >>     Deprecated: "Convert ByteString to Text and then normalize"
> >> [2 of 3] Compiling Data.Unicode.NormalizationInsensitive.Unsafe (
> >> Data/Unicode/NormalizationInsensitive/Unsafe.hs,
> >> .stack-work/dist/x86_64-osx/Cabal-1.22.5.0/build/Data/Unicode/
> NormalizationInsensitive/Unsafe.o
> >> )
> >> [3 of 3] Compiling Data.Unicode.NormalizationInsensitive (
> >> Data/Unicode/NormalizationInsensitive.hs,
> >> .stack-work/dist/x86_64-osx/Cabal-1.22.5.0/build/Data/Unicode/
> NormalizationInsensitive.o
> >> )
> >>
> >> Data/Unicode/NormalizationInsensitive.hs:25:31: Warning:
> >>     ‘normalize’ is exported by ‘Normalizable(normalize)’ and ‘normalize’
> >> In-place registering normalization-insensitive-2.0...
> >> Installing library in
> >>
> >> /Users/ppelleti/programming/haskell/normalize/.stack-work/
> install/x86_64-osx/lts-6.1/7.10.3/lib/x86_64-osx-ghc-7.10.
> 3/normalization-insensitive-2.0-KLVtcrPtbow6nG8kRB6WPM
> >> Registering normalization-insensitive-2.0...
> >> whiteandnerdy:normalize ppelleti$
> >>
> >> I hadn't even been aware of these warnings in the package I was
> >> developing, until Harendra Kumar pointed them out to me, after I had
> >> uploaded a candidate to Hackage.
> >>
> >> --Patrick
> >>
> >>
> >> _______________________________________________
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> >
> >
>
>
>
> --
> Chris Allen
> Currently working on http://haskellbook.com
>
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