pind: Pins a command to a directory

pind.sh

#!/bin/sh

# Any command invoked with the pind prefix gets stored along with its $PWD so
# subsequent invocations are executed in the same directory. For example:
#
#    $ pind pwd
#    /home/juan
#    $ cd /etc
#    $ pind pwd
#    /home/juan
#
# You can also put an arbitrary value in the PIND environment variable to have
# different variants of the same exact command
#    $ PIND=1 pwd
#    $ PIND=2 pwd   # In some other directory
pind() {
  set -euo pipefail

  CONFIG="$HOME/.local/share/pind.db"

  mkdir -p $(dirname "$CONFIG")
  touch "$CONFIG"

  HASH="$(echo "$@" "${PIND:-}" | sha1sum | awk '{ print $1 }')"
  LINE=$(grep "$HASH" "$CONFIG" || echo)

  if [ ! -z "$LINE" ]; then
    DIR="$(printf "%s" "$LINE" | sed 's/.*://')"
    (cd "$DIR"; $@)
  else
    echo "$HASH:$PWD" >> "$CONFIG"
    $@
  fi
}

pind "$@"