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.. _writing-tactics:
====================
Creating new tactics
====================
The languages presented in this chapter allow one to build complex
tactics by combining existing ones with constructs such as
conditionals and looping. While :ref:`Ltac <ltac>` was initially
thought of as a language for doing some basic combinations, it has
been used successfully to build highly complex tactics as well, but
this has also highlighted its limits and fragility. The experimental
language :ref:`Ltac2 <ltac2>` is a typed and more principled variant
which is more adapted to building complex tactics.
There are other solutions beyond these two tactic languages to write
new tactics:
- `Mtac2 <https://github.com/Mtac2/Mtac2>`_ is an external plugin
which provides another typed tactic language. While Ltac2 belongs
to the ML language family, Mtac2 reuses the language of Coq itself
as the language to build Coq tactics.
- The most traditional way of building new complex tactics is to write
a Coq plugin in OCaml. Beware that this also requires much more
effort and commitment. A tutorial for writing Coq plugins is
available in the Coq repository in `doc/plugin_tutorial
<https://github.com/coq/coq/tree/master/doc/plugin_tutorial>`_.
.. toctree::
:maxdepth: 1
../../proof-engine/ltac
../../proof-engine/ltac2
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