writing: Consolidate into module

For now, contains bibtex and zathura options, though it will undoubtedly
increase as I add more writing utilities (such as jrnl) into the repo.

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

@@ -1,29 +0,0 @@
-#!/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")"