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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/125762/">https://git.reviewboard.kde.org/r/125762/</a>
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<a href="https://git.reviewboard.kde.org/r/125762/diff/4/?file=412432#file412432line69" style="color: black; font-weight: bold; text-decoration: underline;">src/extractors/externalextractor.cpp</a>
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(Diff revision 4)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">Q_FOREACH</span><span class="p">(</span><span class="k">auto</span> <span class="n">path</span><span class="p">,</span> <span class="n">pathList</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">That isn't even really the right reason.
Even if all supported compilers can do range-for, you still don't want to use range-for on a Qt container (it would cause a detach).</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">And vice-versa, don't use range-for on a Qt container, it makes a deep copy.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">So the rule is simple:
<em style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;"> Q_FOREACH on Qt containers
</em> range-for on STL containers (*)</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">(*) after ensuring that all supported compilers can handle it; I thought this was the case btw, but I didn't check that wiki page.</p></pre>
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<p>- David Faure</p>
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<p>On October 24th, 2015, 12:19 p.m. UTC, Boudhayan Gupta wrote:</p>
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<div>Review request for Baloo, KDE Frameworks, Pinak Ahuja, and Vishesh Handa.</div>
<div>By Boudhayan Gupta.</div>
<p style="color: grey;"><i>Updated Oct. 24, 2015, 12:19 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
kfilemetadata
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This patch introduces support for external metadata extractors in KFileMetaData</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The external extractors themselves can be written in any language, provided that it can be executed as a standalone executable (compiled or script with a hashbang), with command line arguments, and can output data to stdout.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The extractors are executed like so:</p>
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<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;"><code style="text-rendering: inherit;color: #4444cc;padding: 0;white-space: normal;margin: 0;line-height: inherit;">extractor --mimetypes</code> - outputs a list of mimetypes supported by the extractor, one per line.</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;"><code style="text-rendering: inherit;color: #4444cc;padding: 0;white-space: normal;margin: 0;line-height: inherit;">extractor filename</code> - outputs a json document with the metadata. The keys are such that they can be directly used with PropertyInfo::fromName().</li>
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<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">At the KFileMetaData end, an additional internal plugin (ExternalExtractor) is provided that forms a conduit between external extractors and the internal API. This plugin looks for executables called kfilemetadata_extractor_<something> in /usr/bin to find external extractors, and executes them with the --mimetypes arg to find the list of mimetypes each extractor supports. ExternalExtractor then claims to support all of these mimetypes, and then delegates to the extractor executable when doing the actual extraction.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Tested with the sample executable file extractor (as attched, written in python) with the dump manual test in KFileMetaData. Works.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>README.md <span style="color: grey">(19b1a26)</span></li>
<li>src/extractors/CMakeLists.txt <span style="color: grey">(5dd223e)</span></li>
<li>src/extractors/externalextractor.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>src/extractors/externalextractor.cpp <span style="color: grey">(PRE-CREATION)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/125762/diff/" style="margin-left: 3em;">View Diff</a></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">File Attachments </h1>
<li><a href="https://git.reviewboard.kde.org/media/uploaded/files/2015/10/23/146b657f-31d9-4117-a82f-ef966a6339d4__kfilemetadata_extractor_executable">kfilemetadata_extractor_executable</a></li>
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