[BusyBox] bb: generate Config.h entries from compiled busybox help

[David Douthitt]

Here is the shell script.  It works under ash and bash and ksh; I 
don't know about others like lash or sash.

-- 
David Douthitt
UNIX Systems Administrator
HP-UX, Linux, Unixware
n9ubh at callsign.net

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#!/bin/sh

# Example output:
#
# BusyBox v0.49pre (2001.01.25-21:56+0000) multi-call binary -- GPL2
# 
# Usage: busybox [function] [arguments]...
#    or: [function] [arguments]...
# 
# 	BusyBox is a multi-call binary that combines many common Unix
# 	utilities into a single executable.  Most people will create a
# 	link to busybox for each function they wish to use, and BusyBox
# 	will act like whatever it was invoked as.
# 
# Currently defined functions:
# 	busybox, cat, chgrp, chmod, chown, clear, cp, cut, date, dd, df,
# 	dmesg, du, dutmp, false, fdflush, find, grep, gunzip, gzip, halt,
# 	head, hostname, id, init, insmod, kill, killall, ln, loadkmap,
# 	logger, ls, makedevs, md5sum, mkdir, mkfs.minix, mknod, mktemp,
# 	more, mount, mv, nslookup, ping, printf, rdate, renice, rm, rmdir,
# 	rmmod, sort, swapoff, swapon, sync, tail, tar, tee, touch, tr,
# 	true, umount, uname, uniq, update, uptime, usleep, wc, which,
# 	whoami, xargs, zcat

BUSYBOX=${1:-$(which busybox)}

if [ -z "$BUSYBOX" ]; then
	echo Could not find busybox!
	exit 1
elif [ ! -x "$BUSYBOX" ]; then
	echo $BUSYBOX not executable!
	exit 1
fi

config_out () {
	local CMD
#	...this does not work with busybox tr	
#	CMD=$(echo $1 | tr [:lower:] [:upper:])
	CMD=$(echo $1 | tr "abcdefghijklmnopqrstuvwxyz." \
		"ABCDEFGHIJKLMNOPQRSTUVWXYZ_")

#	The default case is valid though dangerous; we are assuming
#	that busybox knows what its programs are.  If a program
#	is added that is toggled by a "combined" define (with other programs)
#	then another special case will need to be added.

	case $CMD in
		SWAPON|SWAPOFF) echo "#define BB_SWAPONOFF" ;;
		TRUE|FALSE) echo "#define BB_TRUE_FALSE" ;;
		CHMOD|CHOWN|CHGRP) echo "#define BB_CHMOD_CHOWN_CHGRP" ;;
		CP|MV) echo "#define BB_CP_MV" ;;
		*) echo "#define BB_$CMD" ;;
	esac
	}

echo "// "
echo "// Busybox Applications ($(date "+%Y.%m.%d-%H:%M"))"
echo "// "
echo "// Compiled from: $($BUSYBOX 2>&1 | head -n 1)"
echo "// "

bb_apps () {
	$BUSYBOX 2>&1 | sed '1,/^Currently/d; s/,//g;'
	}

COUNT=$(bb_apps | wc -w | sed 's/^ *//')

( for cmd in $(bb_apps); do
	config_out $cmd
done ) | sort | uniq

echo "//"
echo "// End Busybox Applications ($(date "+%Y.%m.%d-%H:%M"))"
echo "//"
echo "// $COUNT applications defined..."
echo "//"