zulip/docs/overview/directory-structure.md

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# Directory structure
This page documents the Zulip directory structure, where to find
things, and how to decide where to put a file.
You may also find the [new application feature
tutorial](../tutorials/new-feature-tutorial.md) helpful for understanding the
flow through these files.
### Core Python files
Zulip uses the [Django web
framework](https://docs.djangoproject.com/en/1.8/), so a lot of these
paths will be familiar to Django developers.
* `zproject/urls.py` Main
[Django routes file](https://docs.djangoproject.com/en/1.8/topics/http/urls/).
Defines which URLs are handled by which view functions or templates.
* `zerver/models.py` Main
[Django models](https://docs.djangoproject.com/en/1.8/topics/db/models/)
file. Defines Zulip's database tables.
* `zerver/lib/actions.py` Most code doing writes to user-facing database tables.
* `zerver/views/*.py` Most [Django views](https://docs.djangoproject.com/en/1.8/topics/http/views/).
* `zerver/webhooks/` Webhook views and tests for [Zulip's incoming webhook integrations](
https://zulipchat.com/api/incoming-webhooks-overview).
* `zerver/tornado/views.py` Tornado views.
* `zerver/worker/queue_processors.py` [Queue workers](../subsystems/queuing.md).
* `zerver/lib/*.py` Most library code.
* `zerver/lib/bugdown/` [Backend Markdown processor](../subsystems/markdown.md).
* `zproject/backends.py` [Authentication backends](https://docs.djangoproject.com/en/1.8/topics/auth/customizing/).
-------------------------------------------------------------------
### HTML Templates
See [our docs](../subsystems/html-css.md) for details on Zulip's
templating systems.
* `templates/zerver/` For [Jinja2](http://jinja.pocoo.org/) templates
for the backend (for zerver app; logged-in content is in `templates/zerver/app`).
* `static/templates/` [Handlebars](http://handlebarsjs.com/) templates for the frontend.
----------------------------------------
### JavaScript, TypeScript, and other static assets
* `static/js/` Zulip's own JavaScript and TypeScript sources.
* `static/styles/` Zulip's own CSS.
* `static/images/` Zulip's images.
* `static/third/` Third-party JavaScript and CSS that has been vendored.
* `node_modules/` Third-party JavaScript installed via `yarn`.
* `static/assets/` For assets not to be served to the web (e.g. the system to
generate our favicons).
-----------------------------------------------------------------------
### Tests
* `zerver/tests/` Backend tests.
* `frontend_tests/node_tests/` Node Frontend unit tests.
* `frontend_tests/casper_tests/` Casper frontend tests.
* `tools/test-*` Developer-facing test runner scripts.
-----------------------------------------------------
### Management commands
These are distinguished from scripts, below, by needing to run a
Django context (i.e. with database access).
* `zerver/management/commands/`
[Management commands](../subsystems/management-commands.md) one might run at a
production deployment site (e.g. scripts to change a value or
deactivate a user properly).
---------------------------------------------------------------
### Scripts
* `scripts/` Scripts that production deployments might run manually
(e.g., `restart-server`).
* `scripts/lib/` Scripts that are needed on production deployments but
humans should never run directly.
* `scripts/setup/` Scripts that production deployments will only run
once, during installation.
* `tools/` Scripts used only in a Zulip development environment.
These are not included in production release tarballs for Zulip, so
that we can include scripts here one wouldn't want someone to run in
production accidentally (e.g. things that delete the Zulip database
without prompting).
* `tools/setup/` Subdirectory of `tools/` for things only used during
the development environment setup process.
* `tools/ci/` Subdirectory of `tools/` for things only used to
setup and run our tests in CI. Actual test suites should
go in `tools/`.
---------------------------------------------------------
### API and Bots
* See the [Zulip API repository](https://github.com/zulip/python-zulip-api).
Zulip's Python API bindings, a number of Zulip integrations and
bots, and a framework for running and testing Zulip bots, used to be
developed in the main Zulip server repo but are now in their own repo.
* `templates/zerver/integrations/` (within `templates/zerver/`, above).
Documentation for these integrations.
-------------------------------------------------------------------------
### Production puppet configuration
This is used to deploy essentially all configuration in production.
* `puppet/zulip/` For configuration for production deployments.
* `puppet/zulip/manifests/voyager.pp` Main manifest for Zulip standalone deployments.
-----------------------------------------------------------------------
### Additional Django apps
* `confirmation` Email confirmation system.
* `analytics` Analytics for the Zulip server administrator (needs work to
be useful to normal Zulip sites).
* `corporate` The old Zulip.com website. Not included in production
distribution.
* `zilencer` Primarily used to hold management commands that aren't
used in production. Not included in production distribution.
-----------------------------------------------------------------------
### Jinja2 Compatibility Files
* `zproject/jinja2/__init__.py` Jinja2 environment.
-----------------------------------------------------------------------
### Translation files
* `locale/` Backend (Django) and frontend translation data files.
-----------------------------------------------------------------------
### Documentation
* `docs/` Source for this documentation.
--------------------------------------------------------------
You can consult the repository's `.gitattributes` file to see exactly
which components are excluded from production releases (release
tarballs are generated using `tools/build-release-tarball`).