unixorn/git-extra-commands

#!/usr/bin/env bash
#
# Copyright 2020, Joe Block <jpb@unixorn.net>
#
# Show the log of a specific function
#
# Based on example in https://twitter.com/tgamblin/status/1340834896432926720
#
# You will need to add
#  *.py diff=python
#  *.rb diff=ruby
# to your ~/.gitattributes file to get it to work for python and ruby

usage() {
  # shellcheck disable=SC2086
  echo "Usage:"
  myname=$(basename "$0")
  echo "$myname function file"
}

if [[ -n "$DEBUG" ]]; then
  set -x
fi

if [[ $# -ne 2 ]]; then
  usage "$@"
  exit 13
fi

function_name=$1
filename=$2

if [[ ! -f "$filename" ]]; then
  echo "$filename is not a file."
  usage "$@"
  exit 13
fi

exec git log -L:"${function_name}:${filename}"