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<h1>Plugin &ndash; lektor-git-timestamp 1.0.0</h1>
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<p>Lektor type to deduce page modification time from git<p>
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<h4>Project links</h4>
<ul class="tree-nav">
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<li><a href="https://pypi.org/project/lektor-git-timestamp/" class="ext">Homepage</a></li>
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</ul>
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<h4>Meta</h4>
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<p><strong>Version:</strong> 1.0.0</p>
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<p><strong>Author:</strong>
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<a href="mailto:dairiki@dairiki.org">Jeff Dairiki</a>
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</p>
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<h4>Tags</h4>
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<a href="../tag/git/">git</a>,
<a href="../tag/metadata/">metadata</a>,
and
<a href="../tag/setup-env/">setup-env</a>
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<p>
View <a href="../tags/" class="ref">all tags</a>.
</p>
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</div>
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<h2>Project Description</h2>
<h1>Lektor-Git-Timestamp</h1>
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<p><a href="https://pypi.org/project/lektor-git-timestamp/" rel="nofollow"><img src="https://img.shields.io/pypi/v/lektor-git-timestamp.svg" alt="PyPI version"></a>
<a href="https://pypi.python.org/pypi/lektor-git-timestamp/" rel="nofollow"><img src="https://img.shields.io/pypi/pyversions/lektor-git-timestamp.svg" alt="PyPI Supported Python Versions"></a>
<a href="https://github.com/dairiki/lektor-git-timestamp/blob/master/LICENSE" rel="nofollow"><img src="https://img.shields.io/github/license/dairiki/lektor-git-timestamp" alt="GitHub license"></a>
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<a href="https://github.com/dairiki/lektor-git-timestamp" rel="nofollow"><img src="https://github.com/dairiki/lektor-git-timestamp/workflows/Tests/badge.svg" alt="GitHub Actions (Tests)"></a>
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<p>This Lektor plugin implements a new datetime-like type,
<code>gittimestamp</code>, which gets it's default value from git timestamps.
This can be used to implement auto-updating <code>pub_date</code> and <code>last_mod</code>
fields in Lektor datamodels.</p>
<h2>Description</h2>
<p>The <code>gittimestamp</code> type behaves just like the built-in <code>datetime</code>
type, except that if the field is left blank in <code>contents.lr</code> a
default value will be deduced from git timestamps for the file (or
possibly the file’s filesystem mtime.)</p>
<p>If an explicit value for the field is not found, the git log for the
source file (typically <code>contents.lr</code>) is searched using <code>git log --follow --remove-empty -- &lt;source_filename&gt;</code>, and the author
timestamp of all matching commits are considered. Additionally, if
the source file is dirty with respect to git’s HEAD, or if the file is
not checked into the git tree, the file’s mtime is prepended to that
list of timestamps. That list of timestamps is filtered based on the
<code>ignore_commits</code> and <code>skip_first_commit</code> options (see below); then,
finally, a timestamp is selected from those that remain based on the
setting of the <code>strategy</code> option.</p>
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<h3>Field Options</h3>
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<p>The <code>gittimestamp</code> type supports the following options.</p>
<h4><code>ignore_commits</code></h4>
<p>This can be set to a string, which is interpreted as a regular
expression. Any git commits whose commit message matches this pattern
are ignored when computing a default timestamp value for the field.
(The matching is performed using <code>re.search</code>.)</p>
<h4><code>skip_first_commit</code></h4>
<p>If this boolean option is set, the first commit in the git log for the
source file will be ignored. This is useful for implementing a
<code>last_mod</code> field which has a defined value only if the source file has
actually been modified since the initial commit.</p>
<h4><code>strategy</code></h4>
<p>This option determines which timestamp is selected from the git log
(and/or the file mtime). This can be set to one of four values:</p>
<ul>
<li>
<p><code>last</code>: If the source file is dirty (with respect to the git HEAD
tree), the mtime of the file is used. Otherwise, the timestamp of
the last (nominally the most recent) non-ignored git commit is
used. This is the default strategy.</p>
</li>
<li>
<p><code>first</code>: The timestamp of the first (nominally the earliest) commit
is used.</p>
</li>
<li>
<p><code>latest</code>: The latest timestamp is used. Normally this produces the same
result at <code>last</code>, however due to rebasing, cherry-picking, etc. the git timestamps
may not be monotonically increasing, in which case this option causes the
greatest (most recent) timestamp remaining after any filtering to be selected.</p>
</li>
<li>
<p><code>earliest</code>: The earliest timestamp is used. Normally this produces the same
result at <code>first</code>, but if the timestamps in the git log are not monotonic,
this will select the minimum of all the timestamps remaining after any filtering.</p>
</li>
</ul>
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<h3>Global Configuration</h3>
<p>The following global configuration options are supported.
These values are specified by way of the plugins' <a href="https://www.getlektor.com/docs/plugins/howto/#configure-plugins" rel="nofollow">configuration file</a>:
<code>configs/git-timestamp.ini</code> under the project site directory.</p>
<p>By default, the <a href="https://git-scm.com/docs/git-log#Documentation/git-log.txt---follow" rel="nofollow"><code>--follow</code></a> option is passed to <code>git log</code> when
computing timestamps. This behavior may be adjusted on a global basis by way of the plugins' <a href="https://www.getlektor.com/docs/plugins/howto/#configure-plugins" rel="nofollow">configuration file</a> (<code>configs/git-timestamp.ini</code> under the project site directory) via the following settings:</p>
<h4><code>follow_renames</code></h4>
<p>This is a boolean setting that specifies whether the
<a href="https://git-scm.com/docs/git-log#Documentation/git-log.txt---follow" rel="nofollow"><code>--follow</code></a> option should be passed to <code>git log</code> when
querying git for timestamps. This options causes <code>git</code> to attempt to
follow file renames.</p>
<p>Currently, the <code>follow_renames</code> is not supported when <a href="https://www.getlektor.com/docs/content/alts/" rel="nofollow">Lektor
Alternatives</a> are enabled.</p>
<p>If unspecified, <code>follow_renames</code> defaults to <em>false</em>.</p>
<blockquote>
<p><strong>Changed</strong> in version 1.0.0b3: The default value for
<code>follow_renames</code> was changed from <em>true</em> to <em>false</em>.</p>
</blockquote>
<blockquote>
<p><strong>Note</strong> Since we currently run <code>git log</code> on a per-record basis, when <code>--follow</code>
is specified, <em>copied</em> files may be detected as “renamed”. This may not be ideal.</p>
</blockquote>
<h4><code>follow_rename_threshold</code></h4>
<p>Set the <em>similarity index threshold</em> (passed to <code>git log</code> via its
<a href="https://git-scm.com/docs/git-log#Documentation/git-log.txt--Mltngt" rel="nofollow"><code>-M</code> option</a>) used when detecting renames. This should be
specified as a (floating point) number between 0 and 100,
inclusive. Setting <code>follow_rename_threshold = 100</code> will limit
detection to exact renames only. The default value is 50.</p>
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<h2>Examples</h2>
<p>Here is a simple example excerpt from a datamodel file:</p>
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<pre lang="ini"><span class="na">&lt;...&gt;</span>
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<span class="k">[fields.last_mod]</span>
<span class="na">label</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">Time last modified</span>
<span class="na">type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">gittimestamp</span>
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</pre>
<p>On a page using the above datamodel, so long as the <code>last_mod</code> field
is left blank in the <code>contents.lr</code> file, the page modification time
will be deduced from timestamp of the most recent git commit which
affected that <code>contents.lr</code>. (Or if that file is dirty, the value of
<code>last_mod</code> will be taken from the file’s filesystem mtime.)</p>
<hr>
<p>Here is a more complicated example which demonstrates the use of all the options.</p>
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<pre lang="ini"><span class="na">&lt;...&gt;</span>
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<span class="k">[fields.pub_date]</span>
<span class="na">label</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">Time first published</span>
<span class="na">type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">gittimestamp</span>
<span class="na">strategy</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">first</span>
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<span class="k">[fields.last_mod]</span>
<span class="na">label</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">Time last modified</span>
<span class="na">type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">gittimestamp</span>
<span class="na">ignore_commits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">\[nochange\]</span>
<span class="na">skip_first_commit</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">true</span>
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</pre>
<p>This will get the default value of the <code>pub_date</code> field from the
timestamp of the first (earliest) git commit for the source file.</p>
<p>The default value for <code>last_mod</code> will, as in the previous example, be taken from the
most recent commit for the file, except that:</p>
<ul>
<li>any commits whose commit message include the tag <code>[nochange]</code> will be ignored</li>
<li>the first commit (the one whose timestamp is used for <code>pub_date</code>) is ignored</li>
</ul>
<p>If there has only been one commit of the source file, <code>last_mod</code> will not have
a default value. (It will evaluate to a jinja2 Undefined instance.)</p>
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<h2>Warning: On sorting by <code>gittimestamp</code> in <code>Lektor &lt; 3.3</code></h2>
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<p>A common use case for timestamps is for sorting records.
E.g. in a blog one generally wants to display posts in reverse
chronological order by post date. This generally won't work using
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<code>gittimestamp</code> timestamps with version of Lektor before 3.3.</p>
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<p>The <code>gittimestamp</code> type is implemented using a <em>field
descriptor</em>. (This is required in order to defer computation of the
field value until after the record for the page is available.) In
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<code>lektor&lt;3.3</code>, field descriptors are supported for most usages, the
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<em>one glaring exception</em> being when sorting records.</p>
<p>This was fixed in Lektor PR
<a href="https://github.com/lektor/lektor/pull/789" rel="nofollow">#789</a> which was merged to
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the master branch on February 6, 2021, but didn't make it into a release
until Lektor 3.3, released on December 13 2021.</p>
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<h2>Author</h2>
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<p>Jeff Dairiki <a href="mailto:dairiki@dairiki.org" rel="nofollow">dairiki@dairiki.org</a></p>
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<h2>Changelog</h2>
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<h3>Release 1.0.0 (2024-02-06)</h3>
<p>No code changes from 1.0.0b3</p>
<h3>Release 1.0.0b3 (2024-01-23)</h3>
<h4>Breaking Changes</h4>
<ul>
<li>Drop support for python 3.8.</li>
<li>The default value for the <code>follow_renames</code> global config setting has
changed from <em>true</em> to <em>false</em>.</li>
</ul>
<h4>Bugs Fixed</h4>
<ul>
<li>Fix to work when <a href="https://www.getlektor.com/docs/content/alts/" rel="nofollow">alternatives</a> are enabled. Note that in this case
the <code>follow_renames</code> global option is not supported.</li>
</ul>
<h4>Testing</h4>
<ul>
<li>Test under python 3.12.</li>
</ul>
<h4>Code Style</h4>
<ul>
<li>Style: Use <a href="https://docs.astral.sh/ruff/" rel="nofollow">ruff</a> for style linting and formatting. This replaces
our usage of <code>black</code>, <code>reorder-python-imports</code>, and <code>flake8</code>.</li>
</ul>
<h3>Release 1.0.0b2 (2023-06-15)</h3>
<ul>
<li>Added type annotations.</li>
<li>Convert packaging to PDM.</li>
</ul>
<h4>Code Style</h4>
<ul>
<li>Style: Run <a href="https://github.com/psf/black" rel="nofollow">black</a> and <a href="https://github.com/asottile/reorder-python-imports" rel="nofollow">reorder-python-imports</a> on code. Configure
<a href="https://pre-commit.com/" rel="nofollow">pre-commit</a> to keep all up-to-date.</li>
</ul>
<h4>Tests</h4>
<ul>
<li>Disuse the deprecated module <code>pkg_resources</code>.</li>
</ul>
<h4>Buglets</h4>
<ul>
<li>Do not strip trailing whitespace from <code>git log</code> output. (This was
erroneously removing trailing newlines from the final commit
message.)</li>
</ul>
<h3>Release 1.0.0b1 (2023-04-11)</h3>
<ul>
<li>Drop support for python 2.7 and 3.6. (<a href="https://github.com/dairiki/lektor-git-timestamp/pull/2" rel="nofollow">#2</a>)</li>
</ul>
<h4>Testing</h4>
<ul>
<li>
<p>Test under python 3.10 and 3.11. (<a href="https://github.com/dairiki/lektor-git-timestamp/pull/2" rel="nofollow">#2</a>)</p>
</li>
<li>
<p>Test that <code>lektor.db.Record.get_sort_key</code> works with
descriptor-valued fields. (This requires <code>lektor&gt;=3.3</code>.)</p>
</li>
</ul>
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<h3>Release 0.1.0.post1 (2021-08-12)</h3>
<p>No code changes.</p>
<p>Add warning to README about <code>lektor &gt; 3.2</code> (not yet released) being
required in order to be able to sort records by <code>gittimestamp</code> fields.</p>
<h3>Release 0.1 (2021-02-05)</h3>
<p>No code changes.</p>
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<p>Update development status classifier to "stable".</p>
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<p>Add functional tests.</p>
<h3>Release 0.1a2 (2021-02-03)</h3>
<h4>Bugs Fixed</h4>
<p>Fixed attrocious typo which prevented the use of anything other than the
default <code>strategy=last</code> for picking timestamps.</p>
<h3>Release 0.1a1 (2020-06-16)</h3>
<p>Initial release.</p>
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