images in templates

["Amy de Buitléir" <amy-x92Y4IBCQKU6Cx7ujrKbww@public.gmane.org>]

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I'm writing Pandoc LaTeX and Beamer templates that need to include images 
for corporate branding. So I want to insert an includegraphics command into 
the template, using the include-before-body option, or even modifying the 
default template if necessary.

The problem is that at the time pandoc is invoked, *we don't know the path 
to the images*,
but we do know their location relative to the "user data directory" (e.g. 
/home/amy/.local/share/pandoc) and the location of the YAML defaults file.

Here's the directory structure I'm using for testing.

.
├── example.md
└── templates
    └── defaults                  <-- Ultimately this will live in the user 
data directory
        ├── test.yaml
        ├── body-include.tex      <-- Contains "\includegraphics{test.png}"
        ├── header-include.tex    <-- Contains "\usepackage{graphicx}"
        └── test.png

I have tried two approaches.

1. Using --resource-path. This option can be used to specify locations to 
look for images. That works fine for images that are included in the main 
document, but not for images included in the template.

2. Passing some location information to body-include.tex (or the default 
template if I need to modify that), so it can construct a path to the 
image. The only way I know of to accomplish this is to use ${.}, but that 
only works in fields that expect file paths, not in variables that LaTeX or 
Beamer templates can use, as far as I know.

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