get_maintainers.pl subsystem output

[Duda, Sebastian]

Hi Joe,

I'm conducting a large-scale patch analysis of the LKML with 1.8 million 
patch emails. I'm using the `get_maintainer.pl` script to know which 
patch is related to which subsystem.

I ran into two issues while using the script:

1. When I use the script the trivial way

    $ scripts/get_maintainer.pl --subsystem --status --separator , 
drivers/media/i2c/adv748x/
    Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx> (maintainer:ANALOG 
DEVICES INC ADV748X DRIVER),Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> 
(maintainer:MEDIA INPUT INFRASTRUCTURE 
(V4L/DVB)),linux-media@xxxxxxxxxxxxxxx (open list:ANALOG DEVICES INC 
ADV748X DRIVER),linux-kernel@xxxxxxxxxxxxxxx (open list)
    Maintained,Buried alive in reporters
    ANALOG DEVICES INC ADV748X DRIVER,MEDIA INPUT INFRASTRUCTURE 
(V4L/DVB),THE REST

the output is hard to parse because the status `Maintained` is displayed 
only once but related to two subsystems.

I'd prefer a more table like representation, like this:

    Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx> (maintainer:ANALOG 
DEVICES INC ADV748X DRIVER),linux-media@xxxxxxxxxxxxxxx (open 
list:ANALOG DEVICES INC ADV748X DRIVER),ANALOG DEVICES INC ADV748X 
DRIVER,Maintained
    Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> (maintainer:MEDIA INPUT 
INFRASTRUCTURE (V4L/DVB)),MEDIA INPUT INFRASTRUCTURE 
(V4L/DVB),Maintained
    linux-kernel@xxxxxxxxxxxxxxx (open list),THE REST,Buried alive in 
reporters


2. I want to analyze multiple patches, currently I am calling the script 
once per patch. When calling the script with multiple files the files 
output is merged

    $ scripts/get_maintainer.pl --subsystem --status --separator ',' 
drivers/media/i2c/adv748x/ include/uapi/linux/wmi.h
    Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx> (maintainer:ANALOG 
DEVICES INC ADV748X DRIVER),Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> 
(maintainer:MEDIA INPUT INFRASTRUCTURE 
(V4L/DVB)),linux-media@xxxxxxxxxxxxxxx (open list:ANALOG DEVICES INC 
ADV748X DRIVER),linux-kernel@xxxxxxxxxxxxxxx (open 
list),platform-driver-x86@xxxxxxxxxxxxxxx (open list:ACPI WMI DRIVER)
    Maintained,Buried alive in reporters,Orphan
    ANALOG DEVICES INC ADV748X DRIVER,MEDIA INPUT INFRASTRUCTURE 
(V4L/DVB),THE REST,ACPI WMI DRIVER

I'd like to run the script with all files but separated output, like 
this:

    $ scripts/get_maintainer.pl --subsystem --status --separator ',' 
--separate-files drivers/media/i2c/adv748x/ include/uapi/linux/wmi.h
    Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx> (maintainer:ANALOG 
DEVICES INC ADV748X DRIVER),Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> 
(maintainer:MEDIA INPUT INFRASTRUCTURE 
(V4L/DVB)),linux-media@xxxxxxxxxxxxxxx (open list:ANALOG DEVICES INC 
ADV748X DRIVER),linux-kernel@xxxxxxxxxxxxxxx (open list)
    Maintained,Buried alive in reporters
    ANALOG DEVICES INC ADV748X DRIVER,MEDIA INPUT INFRASTRUCTURE 
(V4L/DVB),THE REST

    platform-driver-x86@xxxxxxxxxxxxxxx (open list:ACPI WMI 
DRIVER),linux-kernel@xxxxxxxxxxxxxxx (open list)
    Orphan,Buried alive in reporters
    ACPI WMI DRIVER,THE REST


My Questions are:
1. How can I make get_maintainer's output to be more table-like?
2. How can I make get_maintainer.pl to separate each file's output?

Kind Regards
Sebastian