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# Using wraptool
Wraptool is a subcommand of Meson that allows you to manage your
source dependencies using the WrapDB database. It gives you all things
you would expect, such as installing and updating dependencies. The
wrap tool works on all platforms, the only limitation is that the wrap
definition works on your target platform. If you find some Wraps that
don't work, please file bugs or, even better, patches.
All code examples here assume that you are running the commands in
your top level source directory. Lines that start with the `$` mark
are commands to type.
## Simple querying
The simplest operation to do is to query the list of packages
available. To list them all issue the following command:
$ meson wrap list
box2d
enet
gtest
libjpeg
liblzma
libpng
libxml2
lua
ogg
sqlite
vorbis
zlib
Usually you want to search for a specific package. This can be done
with the `search` command:
$ meson wrap search jpeg
libjpeg
If a package is not found in the list of wraps, the `search` command
will look in all the wrap dependencies:
$ meson wrap search glib-2.0
Dependency glib-2.0 found in wrap glib
To determine which versions of libjpeg are available to install, issue
the `info` command:
$ meson wrap info libjpeg
Available versions of libjpeg:
9a 2
The first number is the upstream release version, in this case
`9a`. The second number is the Wrap revision number. They don't relate
to anything in particular, but larger numbers imply newer
releases. You should always use the newest available release.
## Installing dependencies
Installing dependencies is just as straightforward. First just create
the `subprojects` directory at the top of your source tree and issue
the install command.
$ meson wrap install libjpeg
Installed libjpeg branch 9a revision 2
Now you can issue a `subproject('libjpeg')` in your `meson.build` file
to use it.
To check if your projects are up to date you can issue the `status` command.
$ meson wrap status
Subproject status
libjpeg up to date. Branch 9a, revision 2.
zlib not up to date. Have 1.2.8 2, but 1.2.8 4 is available.
In this case `zlib` has a newer release available. Updating it is
straightforward:
$ meson wrap update zlib
Updated zlib to branch 1.2.8 revision 4
Wraptool can do other things besides these. Documentation for these
can be found in the command line help, which can be accessed by
`meson wrap --help`.
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