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, 5 insertions, 3 deletions

diff --git a/commands/printenv.c b/commands/printenv.c
index 27ca10d53e..83353aeb32 100644
--- a/commands/printenv.c
+++ b/commands/printenv.c
@@ -57,8 +57,9 @@ static int do_printenv(int argc, char *argv[])
 }
 
 BAREBOX_CMD_HELP_START(printenv)
-BAREBOX_CMD_HELP_USAGE("printenv [variable]\n")
-BAREBOX_CMD_HELP_SHORT("Print value of one or all environment variables.\n")
+BAREBOX_CMD_HELP_TEXT("If an argument is given, printenv prints the content of an environment")
+BAREBOX_CMD_HELP_TEXT("variable to the terminal. If no argument is specified, all variables are")
+BAREBOX_CMD_HELP_TEXT("printed.")
 BAREBOX_CMD_HELP_END
 
 /**
@@ -72,7 +73,8 @@ printed.</p>
 
 BAREBOX_CMD_START(printenv)
 	.cmd		= do_printenv,
-	.usage		= "Print value of one or all environment variables.",
+	BAREBOX_CMD_DESC("print value of environment variables")
+	BAREBOX_CMD_OPTS("[VARIABLE]")
 	BAREBOX_CMD_GROUP(CMD_GRP_ENV)
 	BAREBOX_CMD_HELP(cmd_printenv_help)
 BAREBOX_CMD_END