~/.bin/paper: Find papers interactively

This uses `rofi` to display a list of PDFs in a specific directory.  As
the TODOs note, this could be extended to handle other file types,
directories, ...

Also, no need for `tracker` and similar things, which are much more
heavyweight.  But you do need good file names, otherwise this doesn't
very much.

.bin/paper

#!/bin/sh
# TODO:
#
# - default to xdg-open
# - make program configurable (`-open-with`, implies `-open`?)
# - make opening configurable (`-no-open`)
# - make "chooser" configurable (e.g. allow regular dmenu)
#
# maybe:
#
# - use fzf if called from an interactive terminal (?)
#   - what about scripts called from the commandline, but that should
#     display stuff?  probably they don't exist?
# - allow multiple directories to be searched
base="$HOME/d/books/cs"
paper="$(find "$base" -type f -name '*.pdf' -printf '%P\n' | rofi -dmenu -matching normal -sort -i -markup-rows)"
if [ "$?" -eq "0" ]; then
	evince "$base/$paper"
fi