diff-bash-history-changes.sh

#!/bin/bash

cd ~/sync/

function remove_timestamps {
  grep -v -Pe '^\+#[0-9]+$' -
}

function baseline_no_ts {
  git show HEAD:home/.bash_history | remove_timestamps
}

function history_diff_no_ts {
  git diff --unified=0 --inter-hunk-context=0 -- home/.bash_history \
  | tail -n +6 \
  | remove_timestamps
}

function removals {
  history_diff_no_ts \
  | grep -e '^-' \
  | sed 's/^-//'
}

function additions {
  history_diff_no_ts \
  | grep -e '^+' \
  | sed 's/^+//'
}

function list_changes {
  echo "Removals"
  echo "========"
  echo
  removals

  echo
  echo "Additions"
  echo "========="
  echo
  comm -13 <(baseline_no_ts | sort | uniq) <(additions | sort | uniq)
}

list_changes | less