commands: harmonize in-barebox documentation

This patch does probably too much, but it's hard (and very
cumbersome/time consuming) to break it out. What is does is this:

* each command has one short description, e.g. "list MUX configuration"
* made sure the short descriptions start lowercase
* each command has one usage. That string contains just the
  options, e.g. "[-npn]". It's not part of the long help text.
* that is, it doesn't say "[OPTIONS]" anymore, every usable option
  is listed by character in this (short) option string (the long
  description is in the long help text, as before)
* help texts have been reworked, to make them
  - sometimes smaller
  - sometimes describe the options better
  - more often present themselves in a nicer format
* all long help texts are now created with BUSYBOX_CMD_HELP_
  macros, no more 'static const __maybe_unused char cmd_foobar_help[]'
* made sure the long help texts starts uppercase
* because cmdtp->name and cmdtp->opts together provide the new usage,
  all "Usage: foobar" texts have been removed from the long help texts
* BUSYBOX_CMD_HELP_TEXT() provides the trailing newline by itself, this
  is nicer in the source code
* BUSYBOX_CMD_HELP_OPT() provides the trailing newline by itself
* made sure no line gets longer than 77 characters
* delibertely renamed cmdtp->usage, so that we can get compile-time
  errors (e.g. in out-of-tree modules that use register_command()
* the 'help' command can now always emit the usage, even without
  compiled long help texts
* 'help -v' gives a list of commands with their short description, this
  is similar like the old "help" command before my patchset
* 'help -a' gives out help of all commands

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 8 insertions, 9 deletions

diff --git a/commands/barebox-update.c b/commands/barebox-update.c
index 819bf4dfd1..a24dc3ef4d 100644
--- a/commands/barebox-update.c
+++ b/commands/barebox-update.c
@@ -69,19 +69,18 @@ static int do_barebox_update(int argc, char *argv[])
 }
 
 BAREBOX_CMD_HELP_START(barebox_update)
-BAREBOX_CMD_HELP_USAGE("barebox_update [OPTIONS] <image>\n")
-BAREBOX_CMD_HELP_SHORT("Update barebox to persistent media\n")
-BAREBOX_CMD_HELP_OPT("-t <target>", "\n")
-BAREBOX_CMD_HELP_OPT("-d <device>", "write image to <device> instead of handler default\n")
-BAREBOX_CMD_HELP_OPT("           ", "Can be used for debugging purposes (-d /tmpfile)\n")
-BAREBOX_CMD_HELP_OPT("-y\t", "yes. Do not ask for confirmation\n")
-BAREBOX_CMD_HELP_OPT("-f <level>", "Set force level\n")
-BAREBOX_CMD_HELP_OPT("-l\t", "list registered targets\n")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT("-l\t", "list registered targets")
+BAREBOX_CMD_HELP_OPT("-t TARGET", "specify data target handler name")
+BAREBOX_CMD_HELP_OPT("-d DEVICE", "write image to DEVICE")
+BAREBOX_CMD_HELP_OPT("-y\t", "autom. use 'yes' when asking confirmations")
+BAREBOX_CMD_HELP_OPT("-f LEVEL", "set force level")
 BAREBOX_CMD_HELP_END
 
 BAREBOX_CMD_START(barebox_update)
 	.cmd		= do_barebox_update,
-	.usage		= "update barebox",
+	BAREBOX_CMD_DESC("update barebox to persistent media")
+	BAREBOX_CMD_OPTS("[-ltdyf] [IMAGE]")
 	BAREBOX_CMD_GROUP(CMD_GRP_MISC)
 	BAREBOX_CMD_HELP(cmd_barebox_update_help)
 BAREBOX_CMD_END