Re: [PATCH] Teach "log -F --author=<match>" to behave better

> To handle --author=<match> request, the code created a grep instruction
> that tried to match a line that begins with 'author ' and <match>
> somewhere on the same line.  "begins with 'author '" obviously needs to be
> expressed with an regexp '^author '.
> 
> When the user specifies --fixed-string, this does not work at all.
> 
> This extends the grep machinery so that a match insn can ignore user
> specified --fixed-string request, and uses the '( -e A --and -e B )'
> construct from the grep machinery in order to express "has to begin with
> '^author ', and also the same line must match the given pattern".
> 
> Signed-off-by: Junio C Hamano <gitster@pobox.com>