Git file history + diff (even if moved or renamed)

file-history.sh

function file-history() {
  if [ -z "$2" ]; then
    file_pattern="$(basename "$1")"
  else
    file_pattern="$2"
  fi

  git log --oneline --abbrev-commit --follow "$1" |
    fzf --ansi --preview "commit=\$(echo {1} | cut -d' ' -f1); \
      file=\$(git show --pretty='' --name-only \$commit | grep -i '$file_pattern'); \
      file=\$(echo \$file | sed 's/^$/./g'); \
      git show --color=always \$commit -- \"\$file\" | diff-so-fancy"
}

# Usage: 
# file-history "relative/path/to/file.ext"
# file-history "relative/path/to/file.ext" "before_rename\|after_rename"