Revision 585562 of "Template:Git file/doc" on mediawikiwiki

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This generates a link to a file on [[Gerrit]].

The goal is to avoid ugly URLs in wiki text like
  https://gerrit.wikimedia.org/r/gitweb?p=mediawiki/extensions/examples.git;f=BoilerPlate/README;hb=HEAD
and also future-proof (ha ha) these links against changes and evolution to source code control such as swapping gitweb for GitBlit ({{bug|38383}}).

== Usage ==
 <nowiki>{{git_file</nowiki> |project=mediawiki/extensions/''examples'' |file=''BoilerPlate/README'' }}
produces
:{{git_file|project=mediawiki/extensions/examples|file=BoilerPlate/README }}
 <nowiki>{{git_file</nowiki> |project=mediawiki/extensions/ArticleFeedback 
 |file=modules/jquery.articleFeedback/images/star-new-down.png
 |text=star image | action=blob_plain }}
produces
:{{git_file|project=mediawiki/extensions/ArticleFeedback 
 |file=modules/jquery.articleFeedback/images/star-new-down.png
 |text=star image |action=blob_plain}}
Alas, the line parameter
 <nowiki>{{git_file |file=tests/phpunit/includes/IPTest.php |line=123}}</nowiki>
produces
:{{git_file |file=tests/phpunit/includes/IPTest.php |line=123}}
''help needed with the misery of curly braces and semicolons and link parsing''

=== Parameters ===
; project
: defaults to mediawiki/core. Must be entire path to project &mdash; usually mediawiki/ , often extensions/, then your project &mdash; but not the <tt>.git</tt>
; file
: mandatory. A file or directory within the project.  If you just want to link to the project, use {{tl|gitweb}}. Note to avoid confusion you may want to invoke this template with underscore <nowiki>{{git</nowiki>'''_'''file | file=''name''}}.
; text
: optional. The text that's linked.  If not specified, defaults to file.
; action
: optional. You can give a gerrit action, e.g. action=blob_raw , action=tree (gerrit/gitweb infers this if file= a directory)... ''TODO: what are the other values?''
; line
: optional. line=42 will add a fragment to the URL that positions the browser at line 42 of the file. ''Except for bugs, help needed''

== Issues ==
* every gerrit project is under mediawiki/ and most under extensions, so maybe one or both is redundant?
* why does the semicolon in the <nowiki>{{#if: TEST|;need that semicolon|}}</nowiki> test introduce whitespace?  (Workaround is to use HTML entity &amp;#59; )
* action= is gerrit-specific, maybe abstract away from gerrit to format=raw/''mimetype''/...
* TODO: add branch= parameter
* TODO: fix line=nnn misery
* ? Merge with {{tl|Git}}, or maybe {{tl|Gerrit}}, {{tl|MW file}}, etc. but simpler?

== See also ==
* this replaces Template:GitwebFile that had almost exactly the same functionality (but undocumented and uncategorized so spage missed it)
* {{tl|MW file}} generates complicated link to file, used by [[Manual]]
* lots of other fancy templates for extensions on gerrit, see [[:Category:Git]]
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[[Category:Git]]
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