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75 lines
3.2 KiB
ReStructuredText
75 lines
3.2 KiB
ReStructuredText
Developer Guide
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===============
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When looking at a non-trivial codebase for the first time, it's very difficult to understand
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anything of it until you get the "Big Picture". This page is meant to, hopefully, make you get
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dupeGuru's big picture.
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Branches and tags
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-----------------
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The git repo has one main branch, ``master``. It represents the latest "stable development commit",
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that is, the latest commit that doesn't include in-progress features. This branch should always
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be buildable, ``tox`` should always run without errors on it.
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When a feature/bugfix has an atomicity of a single commit, it's alright to commit right into
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``master``. However, if a feature/bugfix needs more than a commit, it should live in a separate
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topic branch until it's ready.
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Every release is tagged with the version number. For example, there's a ``2.8.2`` tag for the
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v2.8.2 release.
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Model/View/Controller... nope!
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------------------------------
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dupeGuru's codebase has quite a few design flaws. The Model, View and Controller roles are filled by
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different classes, scattered around. If you're aware of that, it might help you to understand what
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the heck is going on.
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The central piece of dupeGuru is :class:`core.app.DupeGuru`. It's the only
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interface to the python's code for the GUI code. A duplicate scan is started with
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:meth:`core.app.DupeGuru.start_scanning()`, directories are added through
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:meth:`core.app.DupeGuru.add_directory()`, etc..
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A lot of functionalities of the App are implemented in the platform-specific subclasses of
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:class:`core.app.DupeGuru`, like ``DupeGuru`` in ``cocoa/inter/app.py``, or the ``DupeGuru`` class
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in ``qt/base/app.py``. For example, when performing "Remove Selected From Results",
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``RemoveSelected()`` on the cocoa side, and ``remove_duplicates()`` on the PyQt side, are
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respectively called to perform the thing.
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.. _jobs:
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Jobs
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----
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A lot of operations in dupeGuru take a significant amount of time. This is why there's a generalized
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threaded job mechanism built-in :class:`~core.app.DupeGuru`. First, :class:`~core.app.DupeGuru` has
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a ``progress`` member which is an instance of
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:class:`~hscommon.jobprogress.performer.ThreadedJobPerformer`. It lets the GUI code know of the progress
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of the current threaded job. When :class:`~core.app.DupeGuru` needs to start a job, it calls
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``_start_job()`` and the platform specific subclass deals with the details of starting the job.
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Core principles
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---------------
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The core of the duplicate matching takes place (for SE and ME, not PE) in :mod:`core.engine`.
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There's :func:`core.engine.getmatches` which take a list of :class:`core.fs.File` instances and
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return a list of ``(firstfile, secondfile, match_percentage)`` matches. Then, there's
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:func:`core.engine.get_groups` which takes a list of matches and returns a list of
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:class:`.Group` instances (a :class:`.Group` is basically a list of :class:`.File` matching
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together).
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When a scan is over, the final result (the list of groups from :func:`.get_groups`) is placed into
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:attr:`core.app.DupeGuru.results`, which is a :class:`core.results.Results` instance. The
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:class:`~.Results` instance is where all the dupe marking, sorting, removing, power marking, etc.
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takes place.
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API
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---
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.. toctree::
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:maxdepth: 2
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core/index
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hscommon/index
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