scripts/get_maintainer.pl: add --file-emails, find embedded email addresses

Add an imperfect option to search a source file for email addresses.

New option:  --file-emails or --fe

email addresses in files are freeform text and are nearly impossible to
parse.  Still, might as well try to do a somewhat acceptable job of
finding them.  This code should find all addresses that are in the form
[email protected]

The code assumes that up to 3 alphabetic words along with dashes, commas,
and periods that preceed the email address are a name.

If 3 words are found for the name, and one of the first two words are a
single letter and period, or just a single letter then the 3 words are use
as name otherwise the last 2 words are used.

Some variants that are shown correctly:
    John Smith <[email protected]>
    Random J. Developer <[email protected]>
    Random J. Developer ([email protected])
    J. Random Developer [email protected]

Variants that are shown nominally correctly:
    Written by First Last ([email protected])
is shown as:
    First Last <[email protected]>

Variants that are shown incorrectly:
    Some Really Long Name <[email protected]>
    MontaVista Software, Inc. <[email protected]>
are returned as:
    Long Name <[email protected]>
    "Software, Inc" <[email protected]>

--roles and --rolestats show "(in file)" for matches.

For instance:

Without -file-emails:

$ ./scripts/get_maintainer.pl -f -nogit -roles net/core/netpoll.c
David S. Miller <[email protected]> (maintainer:NETWORKING [GENERAL])
[email protected] (open list)

With -fe:

$ ./scripts/get_maintainer.pl -f -fe -nogit -roles net/core/netpoll.c
David S. Miller <[email protected]> (maintainer:NETWORKING [GENERAL])
Matt Mackall <[email protected]> (in file)
Ingo Molnar <[email protected]> (in file)
[email protected] (open list)
[email protected] (open list:NETWORKING [GENERAL])

The number of email addresses in the file in not limited.  Neither is the
number of returned email addresses.

Signed-off-by: Joe Perches <[email protected]>
Cc: Matt Mackall <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions