README
author Boris Feld <boris.feld@octobus.net>
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=============================
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Mutable History For Mercurial
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=============================
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Evolve Extension
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=================
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This package supplies the ``evolve`` extension for Mercurial,
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**The full implementation of the changeset evolution concept is still in
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progress.**  Please subscribe to the `evolve-testers mailing list
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<https://www.mercurial-scm.org/mailman/listinfo/evolve-testers>`_ to stay up to
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date with changes.
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This extension:
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* enables the "changeset evolution" feature of Mercurial core,
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* provides a set of commands to mutate your history,
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* issues several warning messages when troubles from some mutable appears in
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  your repository,
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* provides an ``hg evolve`` command to deal with such "troubles",
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* improves performance of obsolescence marker exchanges and discovery during
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  push and pull.
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Documentation
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-------------
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We recommend reading the documentation first. An online version is
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available here:
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    https://www.mercurial-scm.org/doc/evolution/
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How to Install
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==============
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Using Pip
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---------
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You can install the latest evolution version usin pip::
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    $ pip install --user hg-evolve
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Then just enable it in you hgrc::
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    $ hg config --edit # adds the two line below:
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    [extensions]
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    evolve =
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From Source
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-----------
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To install a local version from source::
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    $ hg clone https://www.mercurial-scm.org/repo/evolve/
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    $ cd evolve
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    $ pip install --user .
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Then just enable it in you hgrc::
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    $ hg config --edit # adds the two line below:
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    [extensions]
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    evolve =
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Documentation lives in ``doc/``.
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Server Only Setup
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=================
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It is possible to enable a smaller subset of the extensions aimed at server
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serving repository. It skips the additions of the new commands and local UI
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messages that might add performance overheads. To use the server only
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extension, install the package and use::
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    $ hg config --edit # adds the two line below:
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    [extensions]
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    evolve.serveronly =
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Extension Purpose
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=================
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The goal of this extension is to provide an appropriate place for code and
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concept related to changeset evolution to mature. In this extension we allow
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for hackier code, unlocking quick experimentation and faster iterations.
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In addition, the evolve extensions support a wider set of Mercurial version,
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allowing us to reach a larger user base for feedback. The Evolve extension is
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not tight to the Mercurial release cycle and can release new feature and bug
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fix at a higher rate if necessary.
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Once a concept is ready enough, its implementation is moved into Mercurial
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core. The maturation period helped us to get a clearer picture of what was
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needed. During the upstreaming process, we can use this clearer picture to
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clean up the code and upgrade it to an appropriate quality for Mercurial core.
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Python 3 support
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================
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Mercurial announced beta support for Python 3 starting with its 5.0 release.
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Since 9.1.0, ``evolve`` has beta support for Python 3.6+.
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Support will stay in beta while Mercurial's support for Python 3 remains in
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beta and until it is a bit more battle-tested.
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How to Contribute
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=================
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Discussion happens on the #hg-evolve IRC on freenode_.
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.. _freenode: https://freenode.net/
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Bugs are to be reported on the mercurial's bug tracker (component: `evolution`_):
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.. _evolution: https://bz.mercurial-scm.org/buglist.cgi?component=evolution&query_format=advanced&resolution=---
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The recommended way is to create Merge Request on
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https://dev.heptapod.net/mercurial/evolve. To do so, create an account and
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request access. You'll then be able to create topic based merge request.
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Alternatively, you can use the patchbomb extension to send email to `mercurial
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devel <https://www.mercurial-scm.org/mailman/listinfo/mercurial-devel>`_.
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Please make sure to use the evolve-ext flag when doing so. You can use a
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command like this::
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    $ hg email --to mercurial-devel@mercurial-scm.org --flag evolve-ext --rev '<your patches>'
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For guidelines on the patch description, see the `official Mercurial guideline`_.
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.. _`official Mercurial guideline`: https://mercurial-scm.org/wiki/ContributingChanges#Patch_descriptions
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Please don't forget to update and run the tests when you fix a bug or
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add a feature. To run the tests, you need a working copy of Mercurial,
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say in $HGSRC::
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    $ cd tests
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    $ python $HGSRC/tests/run-tests.py
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Branch policy
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-------------
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The evolve test are highly impacted by changes in core. To deal with this, we use named branches.
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There are two main branches: "stable" and "default". Tests on these branch are
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supposed to pass with the corresponding "default" and "stable" branch from core
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Mercurial. The documentation is built from the tip of stable.
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In addition, we have compatibility branches to check tests on older version of
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Mercurial. They are the "mercurial-x.y" branches. They are used to apply
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expected test change only, no code change should happen there.
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test output change from a changeset in core should adds the following line to their description:
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CORE-TEST-OUTPUT-UPDATE: <CORE-NODE-ID>
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Format-source config
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====================
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Format source helps smooth out the pain of merging after auto-formatting.
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Follow the instructions for install here:
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.. _`format-source`: https://bitbucket.org/octobus/format-source
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Then update both your global and repo config files::
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    $ hg config -l # add the lines below
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    [extensions]
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    formatsource =
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    [format-source]
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    byteify-strings = python3 ~/workspace/octobus/mercurial-devel/contrib/byteify-strings.py --dictiter --treat-as-kwargs kwargs opts commitopts TROUBLES --allow-attr-methods
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    byteify-strings:mode.input = file
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    byteify-strings:mode.output = pipe