west boards doesn't display the arcitecture.

[tejlmand]

Describe the bug
Running west boards provides a list of all boards in one big list, like:

$ west boards
em_starterkit
em_starterkit_em11d
em_starterkit_em7d
em_starterkit_em7d_v22
emsdp
emsdp_em4
emsdp_em5d
emsdp_em6
emsdp_em7d
emsdp_em7d_esp
emsdp_em9d
hsdk_2cores
hsdk
iotdk
nsim_em7d_v22
nsim_em
nsim_hs
nsim_hs_smp
nsim_sem
nsim_sem_mpu_stack_guard
qemu_arc_em
qemu_arc_hs
96b_aerocore2
96b_argonkey
....

whereas running cmake -P cmake/boards.cmake (which is used by west boards, https://github.com/zephyrproject-rtos/zephyr/blob/master/scripts/west_commands/boards.py#L58) gives a nice arch organized presentation of the boards.

$ cmake -P cmake/boards.cmake 
arc:
  em_starterkit
  em_starterkit_em11d
  em_starterkit_em7d
  em_starterkit_em7d_v22
  emsdp
  emsdp_em4
  emsdp_em5d
  emsdp_em6
  emsdp_em7d
  emsdp_em7d_esp
  emsdp_em9d
  hsdk_2cores
  ...
arm:
  96b_aerocore2
  96b_argonkey
  96b_avenger96
  96b_carbon
  96b_carbon_nrf51
  ...
nios2:
  altera_max10
  qemu_nios2
posix:
  native_posix_64
  native_posix
  nrf52_bsim
riscv:
  hifive1
  hifive1_revb
  litex_vexriscv
  m2gl025_miv
  qemu_riscv32
  qemu_riscv64
  rv32m1_vega_ri5cy
  rv32m1_vega_zero_riscy
x86:
  acrn
  minnowboard
  qemu_x86_64
  qemu_x86_coverage
....

To Reproduce
west boards vs cmake -P cmake/boards.cmake

Expected behavior
A board list similar to cmake -P cmake/boards.cmake, as that presents a nice overview for users.

Environment (please complete the following information):

• OS: Linux
• Toolchain N/A
• zephyr/master

Additional context
Add any other context about the problem here.

[nashif]

west boards -f "{arch} - {name}"

[tejlmand]

west boards -f "{arch} - {name}"

Nice, didn't know that ;-) (although output it's still a little different)
Question still is, what would we like to be default, and is there a special reason why we strip the grouping per default, now that we have it ?

Which were the main reason I raised this.

[nashif]

rather than turn it to a question, I would prefer to close this as a non-bug.

[tejlmand]

@nashif we already have a nice formatted list, why remove that formatting just, an then ask users to re-add it in slightly different way ?