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89 lines
2.8 KiB
ReStructuredText
89 lines
2.8 KiB
ReStructuredText
.. _sect-packages:
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********
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Packages
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********
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Idris includes a simple build system for building packages and executables
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from a named package description file. These files can be used with the
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Idris compiler to manage the development process.
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Package Descriptions
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====================
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A package description includes the following:
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+ A header, consisting of the keyword ``package`` followed by a package
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name. Package names can be any valid Idris identifier. The iPKG
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format also takes a quoted version that accepts any valid filename.
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+ Fields describing package contents, ``<field> = <value>``.
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At least one field must be the modules field, where the value is a
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comma separated list of modules. For example, given an idris package
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``maths`` that has modules ``Maths.idr``, ``Maths.NumOps.idr``,
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``Maths.BinOps.idr``, and ``Maths.HexOps.idr``, the corresponding
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package file would be:
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::
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package maths
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modules = Maths
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, Maths.NumOps
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, Maths.BinOps
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, Maths.HexOps
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Running ``idris2 --init`` will interactively create a new package file in the current directory. The generated pacakge file lists all configurable fields with a brief description.
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Other examples of package files can be found in the ``libs`` directory
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of the main Idris repository, and in `third-party libraries
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<https://github.com/idris-lang/Idris-dev/wiki/Libraries>`_.
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Using Package files
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===================
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Idris itself is aware about packages, and special commands are
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available to help with, for example, building packages, installing
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packages, and cleaning packages. For instance, given the ``maths``
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package from earlier we can use Idris as follows:
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+ ``idris2 --build maths.ipkg`` will build all modules in the package
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+ ``idris2 --install maths.ipkg`` will install the package, making it
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accessible by other Idris libraries and programs.
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+ ``idris2 --clean maths.ipkg`` will delete all intermediate code and
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executable files generated when building.
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Once the maths package has been installed, the command line option
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``--package maths`` makes it accessible (abbreviated to ``-p maths``).
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For example:
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::
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idris2 -p maths Main.idr
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Package Dependencies Using Atom
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===============================
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If you are using the Atom editor and have a dependency on another package,
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corresponding to for instance ``import Lightyear`` or ``import Pruviloj``,
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you need to let Atom know that it should be loaded. The easiest way to
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accomplish that is with a .ipkg file. The general contents of an ipkg file
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will be described in the next section of the tutorial, but for now here is
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a simple recipe for this trivial case:
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- Create a folder myProject.
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- Add a file myProject.ipkg containing just a couple of lines:
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.. code-block:: idris
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package myProject
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depends = pruviloj, lightyear
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- In Atom, use the File menu to Open Folder myProject.
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