'cabal-bounds' is able to do two things:

• drop the bounds of the dependencies in the cabal file

• update the bounds of the dependencies in the cabal file using the cabal build information

Example: Raise the upper Bounds

If you have several cabalized projects, then it can be quite time consuming to keep the bounds of your dependencies up to date. Especially if you're following the package versioning policy, then you want to raise your upper bounds from time to time, to allow the building with newer versions of the dependencies.

'cabal-bounds' tries to automate this update process to some degree. So a typical update process might look like:

# update the version infos of all libraries
$> cabal update

# drops the upper bound of all dependencies in 'myproject.cabal',
# most likely you want to ignore 'base'
$> cabal-bounds drop --upper --ignore=base myproject.cabal

# create a cabal sandbox for building of 'myproject'
$> cabal sandbox init

# build 'myproject'
$> cabal install

# update the upper bound of all dependencies in 'myproject.cabal'
# by the cabal build information
$> cabal-bounds update --upper --ignore=base myproject.cabal dist/dist-sandbox-*/setup-config

Example: Bound Changes

The => shows what the result is of the operation for every dependency. Left is the dependency before calling the command, right the one after calling.

$> cabal-bounds drop ...
lens >=4.0.1 && <4.1   =>   lens

$> cabal-bounds drop --upper ...
lens >=4.0.1 && <4.1   =>   lens >=4.0.1

If the cabal build (the setup-config) uses 'lens 4.1.2', then the results of the update command would be:

$> cabal-bounds update ...
lens >=4.0.1 && <4.1   =>   lens >=4.1.2 && <4.2
lens                   =>   lens >=4.1.2 && <4.2

$> cabal-bounds update --lower ...
lens >=4.0.1 && <4.1   =>   lens >=4.1.2
lens <4.1              =>   lens >=4.1.2
lens                   =>   lens >=4.1.2

$> cabal-bounds update --upper ...
lens >=4.0.1 && <4.1   =>   lens >=4.0.1 && <4.2
lens >=4.0.1           =>   lens >=4.0.1 && <4.2
lens                   =>   lens >=4.1.2 && <4.2

You can also specify which component of the version number should be updated:

$> cabal-bounds update --lowercomp=minor ...
lens >=4.0.1 && <4.1   =>   lens >=4.1.2

$> cabal-bounds update --lowercomp=major2 ...
lens >=4.0.1 && <4.1   =>   lens >=4.1

$> cabal-bounds update --lowercomp=major1 ...
lens >=4.0.1 && <4.1   =>   lens >=4

$> cabal-bounds update --uppercomp=minor ...
lens >=4.0.1 && <4.1   =>   lens >=4.0.1 && <4.1.3

$> cabal-bounds update --uppercomp=major2 ...
lens >=4.0.1 && <4.1   =>   lens >=4.0.1 && <4.2

$> cabal-bounds update --uppercomp=major1 ...
lens >=4.0.1 && <4.1   =>   lens >=4.0.1 && <5

Installation

You have to ensure, that the Cabal library of 'cabal-bounds' matches the one used by the cabal binary:

$> cabal --version
cabal-install version 1.18.0.2
using version 1.18.1 of the Cabal library

$> cabal install --constraint="Cabal == 1.18.1" cabal-bounds

If you update the cabal binary and the used Cabal library changes, then you have to rebuild 'cabal-bounds'.

Options

You can restrict the modification to certain sections in the cabal file by specifing the type and the name of the section:

• --library

• --executable=name

• --testsuite=name

• --benchmark=name

If you omit these options, then all sections are considered and modified.

You can also restrict the modification of dependencies by specifing which dependencies should only or shouldn't be modified:

• --only=name

• --ignore=name

If you omit these options, then all dependencies are considered and modified.

All options taking a name can be specified multiple times:

e.g. '--executable=exe1 --executable=exe2' or '--ignore=base --ignore=whatever'

Please consult 'cabal-bounds --help' for a complete list of options.

Issues

Perhaps the currently most annoying thing is, that you have to live with the reformating of your cabal file done by the pretty printer of the Cabal library.

To reformat your cabal file without changing any bounds you can call 'cabal-bounds' with the name of a section that isn't present in the cabal file:

$> cabal-bounds drop --executable=blub myproject.cabal

---

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Downloads

• cabal-bounds-0.2.1.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

Maintainer's Corner

Package maintainers

• DanielTrstenjak

For package maintainers and hackage trustees

• edit package information

Candidates

• 1.6.0, 2.4.0