[script] Add simple due script for bibtex file

Scrapes a bibtex file for 'due' field, and outputs all found entries
with their priority and sorted for date.

bibtex/.local/bin/rofi-bib-due

@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+
+exist rofi normal
+
+_rofi() {
+  rofi -dmenu -no-auto-select -i -theme themes/dropdown -p "papers" -l 25 -yoffset 20 -columns 1 -u "$urgent"
+}
+
+# call for whatever file is passed in
+results="$(bib-due "$@")"
+
+# mark priority 1 items as urgent in rofi
+urgent="$(
+  # find all lines with priority 1, (marked as `(1):` );
+  # print them on 1 line, -1 since dmenu is 0 indexed
+  echo "$results" | grep -n '(1):' | cut -d: -f1 | awk '{ $0=$0-1; print $0 }' ORS=','
+)"
+
+# get user choice, exit if nothing selected
+choice=$(echo "$results" | _rofi)
+[ -z "$choice" ] && exit 0
+
+key=$(echo "$choice" | sed -E 's/.*\((\w+)\)$/\1/')
+
+# get library pdf folder (only searches for default ./pdf path)
+library="$(dirname "$(realpath "$BIBFILE")")/pdf"
+
+# find and open the key-associated pdf file
+${FILEREADER:-xdg-open} "$(find "$library" -type f -name "$key *.pdf")"