# staversion
staversion is a command-line tool to look for version numbers of Haskell packages.
See `--help` message for detailed usage.
## Package version in Stackage
staversion mainly focuses on package versions in stackage, i.e. it answers to questions like "What version is the package X in stackage lts-Y.ZZ?" It aims to make it easier to write `build-depends` section in YOUR_PACKAGE.cabal.
$ staversion --resolver lts-4.2 conduit
------ lts-4.2
conduit ==1.2.6.1
$ staversion --resolver lts-4.2 --resolver lts-7.0 conduit
------ lts-4.2
conduit ==1.2.6.1
------ lts-7.0
conduit ==1.2.7
$ staversion --resolver lts-4.2 --resolver lts-6 conduit base
------ lts-4.2
conduit ==1.2.6.1,
base ==4.8.2.0
------ lts-6
conduit ==1.2.8,
base ==4.8.2.0
staversion first reads build plan YAML files that are stored locally in your computer, then it tries to fetch them over network.
## Package version in Hackage
You can also look up the latest version numbers hosted on hackage.
$ staversion --hackage conduit base
------ latest in hackage
conduit ==1.2.8,
base ==4.9.0.0
## Package version for build-depends
You can also specify .cabal files in the query. In that case, staversion reads `build-depends` fields in all sections of those .cabal files, and shows versions of the dependency packages.
$ staversion --hackage staversion.cabal
------ latest in hackage
-- staversion.cabal - library
base ==4.9.0.0,
unordered-containers ==0.2.7.2,
aeson ==1.0.2.1,
text ==1.2.2.1,
bytestring ==0.10.8.1,
yaml ==0.8.21.1,
filepath ==1.4.1.1,
directory ==1.3.0.0,
optparse-applicative ==0.13.0.0,
containers ==0.5.9.1,
http-client ==0.5.5,
http-client-tls ==0.3.3,
http-types ==0.9.1,
transformers ==0.5.2.0,
transformers-compat ==0.5.1.4,
megaparsec ==5.1.2
(snip)
## TODO
- Show version number ranges supported by the given resolvers.
- Cache build plans in some local storage (SQLite?)
## Author
Toshio Ito <debug.ito@gmail.com>