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west: Add a boards command

Add a new "boards" command that is able to list all the boards in the
upstream tree. There is currently no support for out-of-tree boards.

The command executes cmake to use the built-in CMake script,
boards.cmake, to list the boards, and then stores the information
retrieved and allows the user to present it in a user-definable format.

Fixes zephyrproject-rtos/west#53

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
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carlescufi committed Apr 23, 2019
1 parent 31bdad5 commit d6f033e6908f4e0ce8f0ee4913f88bc11873bb9b
@@ -3,9 +3,9 @@
Building, Flashing and Debugging
################################

West provides 5 commands for building, flashing, and interacting with Zephyr
programs running on a board: ``build``, ``flash``, ``debug``, ``debugserver``
and ``attach``.
Zephyr provides several :ref:`west extension commands <west-extensions>` for
building, flashing, and interacting with Zephyr programs running on a board:
``build``, ``flash``, ``debug``, ``debugserver`` and ``attach``.

These use information stored in the CMake cache [#cmakecache]_ to
flash or attach a debugger to a board supported by Zephyr. The exception is
@@ -61,6 +61,10 @@ no additional parameters.
whether ``-b`` is required, just try leaving it out. West will print an
error if the option is required and was not given.

.. tip::
You can use the :ref:`west boards <west-boards>` command to list all
supported boards.

Specify the source directory path as the first positional argument::

west build -b <BOARD> path/to/source/directory
@@ -11,12 +11,14 @@ information on west extension commands, and has a tutorial for writing your
own.

Some commands you can run when using west with Zephyr, like the ones used to
:ref:`build, flash, and debug <west-build-flash-debug>`, are extensions. That's
why help for them shows up like this in ``west --help``:
:ref:`build, flash, and debug <west-build-flash-debug>` and the
:ref:`ones described here <west-zephyr-ext-cmds>` , are extensions. That's why
help for them shows up like this in ``west --help``:

.. code-block:: none

commands from project at "zephyr":
boards: display information about supported boards
build: compile a Zephyr application
sign: sign a Zephyr binary for bootloader chain-loading
flash: flash and run a binary on a board
@@ -38,6 +38,7 @@ context about the tool.
config.rst
extensions.rst
build-flash-debug.rst
zephyr-cmds.rst
sign.rst
why.rst
without-west.rst
@@ -0,0 +1,39 @@
.. _west-zephyr-ext-cmds:

Additional Zephyr extension commands
####################################

Aside from the :ref:`build, flash, and debug commands <west-build-flash-debug>`,
the zephyr tree extends the west command set with additional zephyr-specific
commands.

.. Add a per-page contents at the top of the page. This page is nested
deeply enough that it doesn't have any subheadings in the main nav.
.. only:: html

.. contents::
:local:

.. _west-boards:

Listing boards: ``west boards``
*******************************

The ``boards`` command can be used to list the boards that are supported by
Zephyr without having to resort to additional sources of information.

It can be run by typing::

west boards

This command lists all supported boards in a default format. If you prefer to
specify the display format yourself you can use the ``--format`` (or ``-f``)
flag::

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

Additional help about the formatting options can be found by running::

west boards -h

@@ -1,5 +1,10 @@
# Keep the help strings in sync with the values in the .py files!
west-commands:
- file: scripts/west_commands/boards.py
commands:
- name: boards
class: Boards
help: display information about supported boards
- file: scripts/west_commands/build.py
commands:
- name: build
@@ -0,0 +1,94 @@
# Copyright (c) 2019 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: Apache-2.0

import argparse
import collections
import os
import re
import textwrap

from west import log
from west.commands import WestCommand
from cmake import run_cmake

class Boards(WestCommand):

def __init__(self):
super().__init__(
'boards',
# Keep this in sync with the string in west-commands.yml.
'display information about supported boards',
'Display information about boards',
accepts_unknown_args=False)

def do_add_parser(self, parser_adder):
default_fmt = '{name} ({arch})'
parser = parser_adder.add_parser(
self.name,
help=self.help,
formatter_class=argparse.RawDescriptionHelpFormatter,
description=self.description,
epilog=textwrap.dedent('''\
FORMAT STRINGS
Boards are listed using a Python 3 format string. Arguments
to the format string are accessed by name.
The default format string is:
"{}"
The following arguments are available:
- name: board name
- arch: board architecture
'''.format(default_fmt)))

# Remember to update scripts/west-completion.bash if you add or remove
# flags
parser.add_argument('-f', '--format', default=default_fmt,
help='''Format string to use to list each board;
see FORMAT STRINGS below.'''),

return parser

def do_run(self, args, unknown_args):
zb = os.environ.get('ZEPHYR_BASE')
if not zb:
log.die('Internal error: ZEPHYR_BASE not set in the environment, '
'and should have been by the main script')

cmake_args = ['-DBOARD_ROOT_SPACE_SEPARATED={}'.format(zb),
'-P', '{}/cmake/boards.cmake'.format(zb)]
lines = run_cmake(cmake_args, capture_output=True)
arch_re = re.compile(r'\s*([\w-]+)\:')
board_re = re.compile(r'\s*([\w-]+)\s*')
arch = None
boards = collections.OrderedDict()
for line in lines:
match = arch_re.match(line)
if match:
arch = match.group(1)
boards[arch] = []
continue
match = board_re.match(line)
if match:
if not arch:
log.die('Invalid board output from CMake: {}'.format(lines))
board = match.group(1)
boards[arch].append(board)

for arch in boards:
for board in boards[arch]:
try:
result = args.format.format(
name=board,
arch=arch)
print(result)
except KeyError as e:
# The raised KeyError seems to just put the first
# invalid argument in the args tuple, regardless of
# how many unrecognizable keys there were.
log.die('unknown key "{}" in format string "{}"'.
format(e.args[0], args.format))

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