the data is available, you would just need to add the code into the
`print_commit()` routine (along with a way of passing the option
into that function).
- * For `examples/log.c`, implement any one of `--author=<...>`,
- `--committer=<...>`, or `--grep=<...>` but just use simple string
- match with `strstr()` instead of full regular expression
- matching. (I.e. I'm suggesting implementing this as if
- `--fixed-strings` was always turned on, because it will be a simpler
- project.)
* As an extension to the matching idea for `examples/log.c`, add the
`-i` option to use `strcasestr()` for matches.
* For `examples/log.c`, implement the `--first-parent` option now that