Utility to recursively process text file templates and fill in placeholders

Question

I search for a tool that is / can:

• gratis
• free from dependencies (no scripting language interpreter needed, ...)
• preferably a single binary
• run on Linux, optionally Windows
• traverse a (sub)directory structure, processing all files with a certain extension
• replace all placeholders with their value that it retrieves from a structured file (one of json, xml, key=value or CSV)
• write output to a file with identical filename, but extension removed
• preferably open source and actively maintained

The utility could be run like this:

pt /var/opt/configfiles .template values.properties

One template could be named /var/opt/configfiles/fooapp/basic.conf.template with this content:

Say hello to ${Name}

Value.properties could be structured like this:

Name=me
Age=18

After the tool finished I would have a basic.conf.

I know this can be done using sed or awk. I could also write this myself in golang but both approaches are not what I'm looking for.

Answer 1

This utility seems to offer much of what I am looking for: https://github.com/gomatic/renderizer

It can not do this on its own:

• traverse directories
• create output files with a name that excludes the template extension

Its value list file can only be yaml, but this is no real problem