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https://issues.apache.org/jira/browse/MRESOURCES-230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15722026#comment-15722026
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Christian Schulte commented on MRESOURCES-230:
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It is not possible to fix this without breaking backwards compatibility. For
example: Properties resources use the backslash themselves for escaping. They
rely on filtering to preserve any escape not specific to maven. IN = '\\' must
lead to OUT = '\\' for those resources. If an update makes it OUT = '\', those
resources are broken after filtering. That's why it has been done
intentionally. Only escape what is known to maven filtering - leave the rest as
is. Solution is to use an escape string (that's a string not only a single
character) not conflicting with anything else in the file. For example: You
could set the escape string to {{ยงยงยง}} or something unlikely to conflict with
anything in the file.
> Can't escape the escape string
> ------------------------------
>
> Key: MRESOURCES-230
> URL: https://issues.apache.org/jira/browse/MRESOURCES-230
> Project: Maven Resources Plugin
> Issue Type: Bug
> Components: escape string
> Affects Versions: 3.0.1
> Reporter: Thomas Mortagne
> Priority: Critical
>
> I have the following use case in a XML file:
> {code:xml}
> <variable name="xwikiDataDir"
> value="%APPDATA%\XWiki\${project.version}\data"
> condition="windowsSevenAndGreater"/>
> {code}
> Before 3.0 it used to produce
> {code:xml}
> <variable name="xwikiDataDir" value="%APPDATA%\XWiki\8.2\data"
> condition="windowsSevenAndGreater"/>
> {code}
> \ is now the default escape character, I'm fine with that but then it should
> be possible to escape the escape string which is buggy right now.
> The following source
> {code:xml}
> <variable name="xwikiDataDir"
> value="%APPDATA%\XWiki\\${project.version}\data"
> condition="windowsSevenAndGreater"/>
> {code}
> gives me
> {code:xml}
> <variable name="xwikiDataDir" value="%APPDATA%\\XWiki\8.2\data"
> condition="windowsSevenAndGreater"/>
> {code}
> Notice the still doubled \. The first one should be removed from the result.
> I tried escapeWindowsPaths bu it does not seems to be matching my string as a
> Windows path which is probably another bug.
> Since I can't find any way to disable escaping (see MRESOURCES-231),
> I ended up finding a character I don't have in my file and set it as
> escapeString.
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