#!/bin/bash
if [ "$1" == "-h" ] ; then
    echo "
    fetch_citation - extract citation for citekey in a bibtex.bib or bibjson.json file

         usage:
          fetch_citation citeKey

         depends: 
          grep, sed, echo
          pandoc
          pandoc-citeproc
          wl-copy

         defaults:
          Set the required default file locations (csl file, bib file)
 
    "
    exit 0
fi

#Setup defaults
cslFile=${2:-$HOME/projects/learn/bibd/bibd-md.csl}
bibdFile=${3:-$HOME/projects/learn/bibd/OMEGA.bib}
# bibdFile=${2:-$HOME/projects/learn/bibd/OMEGA.json}
cd $(dirname $bibdFile)
set -e #exit if an error

#requires one citeKey string as input
citeKey=$1

#method1
#todo: use json with jq
# outCitation=$(pandoc -f latex <(echo "\cite{$citeKey}") -t plain -o - --bibliography $bibdFile --citeproc --csl $cslFile | tail -n +3)

#method2
#need to use a temporary bib file as input to pandoc because parsing a large bib file is too slow, but json input would be faster
#and because pandoc expects a file input for bibliography
tmpName=$(mktemp --suffix=.bib)
str3=$(grep -A 30 $citeKey, $bibdFile)
echo $str3 | sed -E "s|(.+\} ?\}).+|\1|" > $tmpName
outCitation=$(pandoc -f latex <(echo "\cite{$citeKey}") -t plain -o - --bibliography $tmpName --citeproc --csl $cslFile | tail -n +3)
rm $tmpName

#tail -n +61 $fn | sed -E "s#(.+\}\})#\1#"
# fzf --preview="head {}" --preview-window=up:30%
# fzf --preview="file {}" --preview-window=down:1
echo $outCitation
echo $outCitation | wl-copy