Question

• How to extract File -> Source value
• and assign it as RegistryValue -> Name, where RegistryValue is injected as a new element with the XSLT provided?

Source XML

<?xml version="1.0" encoding="utf-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
    <Fragment>
        <DirectoryRef Id="WixSlave.Binaries">
            <Component Id="cmpA1D1BF677641BE2AE700859D8256B0FC" Guid="{B0BF9CBD-8A5D-43C1-B9DE-0A1B5A6BD1DE}">
                <File Id="filC2827DDF7874712A62423151FBE8CE34" Source="$(var.WixSlave.TargetDir)\WixSlave.exe" />
            </Component>
            <Component Id="cmpBC6AB890535757A915C99A10445CC74E" Guid="{8726FF82-808A-4736-AD0A-C804A34E494B}">
                <File Id="fil7BD5BE5CD71AC92FF47D1D51A99FEE05" Source="$(var.WixSlave.TargetDir)\WixSlave.exe.config" />
            </Component>
        </DirectoryRef>
    </Fragment>
    <Fragment>
        <ComponentGroup Id="WixSlave.Binaries">
            <ComponentRef Id="cmpA1D1BF677641BE2AE700859D8256B0FC" />
            <ComponentRef Id="cmpBC6AB890535757A915C99A10445CC74E" />
        </ComponentGroup>
    </Fragment>
</Wix>

XSLT Working Without Variable Name Attribute Value

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns="http://schemas.microsoft.com/wix/2006/wi" xmlns:wix="http://schemas.microsoft.com/wix/2006/wi" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <!-- Copy all attributes and elements to the output. -->
    <xsl:template match="@*|*">
        <xsl:copy>
            <xsl:apply-templates select="@*"/>
            <xsl:apply-templates select="*"/>
        </xsl:copy>
    </xsl:template>
    <xsl:template match="wix:Wix/wix:Fragment/wix:DirectoryRef/wix:Component">
        <Component>
            <xsl:apply-templates select="@*|*"/>
            <RegistryValue Name="toBeVariableKey" Root="HKCU" Key="Software\[Manufacturer]\[ProductName]" Type="integer" Value="1" KeyPath="yes"/>
        </Component>
    </xsl:template>
</xsl:stylesheet>

• To be more specific I would like to read the File element attribute Source="$(var.WixSlave.TargetDir)\WixSlave.exe" and then transform it to just WixSlaveexe i.e. extract from the source string only letters (a-z, A-Z), starting after last slash

• And then assign that string to the RegistryValue element Name attribute, which in the sample is Name="toBeVariableKey", but should become Name="WixSlaveexe" for the first Component

• For the second Component it should be reading from File Source="$(var.WixSlave.TargetDir)\WixSlave.exe.config" and adding RegistryValue with Name="WixSlaveexeconfig", and so on…

Answer 1

You can use an attribute value template to set the Name

<RegistryValue Name="{substring-after(wix:File/@Source, '\')}" />

This should extract the sub-string after the first slash, and assign the result to the attribute name.

To remove any dots from the text, you can use the translate function, like so

<RegistryValue Name="{translate(substring-after(wix:File/@Source, '\'), '.', '')}" />