pandoc -v
pandoc 2.3.1
Compiled with pandoc-types 1.17.5.1, texmath 0.11.1.1, skylighting 0.7.3
Default user data directory: /Users/vle/.pandoc
Copyright (C) 2006-2018 John MacFarlane
Web:  http://pandoc.org
This is free software; see the source for copying conditions.
There is no warranty, not even for merchantability or fitness
for a particular purpose.

pandoc -h says that there is `-V` and `--varaible KEY[:VALUE]` flag. I want 
to include some value at rendering time (document version). So I did this:

pandoc  --variable gitcommit:xxxxxyyy -o markdowndoc.pdf markdowdoc.md

---
title: Test Variables
output: pdf_document
header-includes:
    - \usepackage{hyperref}
    - \usepackage{datetime}
    - \usepackage{fancyhdr}
    - \pagestyle{fancy}
    - \fancyhead[LE,LO]{}
    - \fancyfoot[CO,CE]{Template Version \pdfdate| Git Commit:$gitcommit$}
    - \fancyfoot[LE,RO]{\thepage}
---

Variable value, gitcommit: $gitcommit$


This however did not result in expected value in the finale PDF document. 
So is it possible at all to do this kind of thing at the moment?

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