Convert pandoc template to handlebars (partial)

pandoc2handlebars.sh

#!/bin/bash


if [ $# -lt 1 ] || [ "$1" == "--help" ] || [ "$1" == "-h" ]
then
  echo "pandoc2handlebars.sh FILE [FILE...]
  
  Converts (partially) the given Pandoc templates to Handlebars files.  
  Hand edit the \$for(var)\$ and other unconverted bits.
"
  exit 1
fi

for FN in "$@"
do
  # Verify or skip
  [ -f "$FN" ] || echo "WARNING: '$FN' is not a file. (skipping)" 1>&2
  [ -f "$FN" ] || continue
  [ -f "${FN}.handlebars" ] && echo "WARNING: Refusing to overwrite '${FN}.handlebars' (skipping)" 1>&2
  [ -f "${FN}.handlebars" ] && continue
  
  sed -E 's/\$endif\$/{{\/if}}/g;s/\$if\(([^\)]*)\)\$/{{#if \1}}/g;s/\$([A-Za-z][A-Za-z0-9.]*)\$/{{\1}}/g' <"$FN" >"${FN}.handebars"

done

This handles a good chunk of the simple textual conversion, but doesn't convert $for(var)$ because Handlebars uses {{this}}, while Pandoc uses var.property. I didn't need to mass convert, so I just used this and hand edited the remainder.

Might could use some whitespace handling, but I have never seen whitespace in $pandoc.vars$ and am not even sure they are valid. This is a practical sed quickie.