#!/bin/sh

# Compile individual versions of each busybox applet.

if [ $# -eq 0 ]
then

# Clear out the build directory.  (Make clean should do this instead of here.)

rm -rf build
mkdir build

# Make our prerequisites.

make busybox.links include/bb_config.h $(pwd)/{libbb/libbb.a,archival/libunarchive/libunarchive.a,coreutils/libcoreutils/libcoreutils.a,networking/libiproute/libiproute.a}

else
# Could very well be that we want to build an individual applet but have no
# 'build' dir yet..

test -d ./build || mkdir build

fi

# About 3/5 of the applets build from one .c file (with the same name as the
# corresponding applet), and all it needs to link against.  However, to build
# them all we need more than that.

# Figure out which applets need extra libraries added to their command line.

function substithing()
{
  if [ "${1/ $3 //}" != "$1" ]
  then
    echo $2
  fi
}

function extra_libraries()
{
  # gzip needs gunzip.c (when gunzip is enabled, anyway).
  substithing " gzip " "archival/gunzip.c archival/uncompress.c" "$1"

  # init needs init_shared.c
  substithing " init " "init/init_shared.c" "$1"

  # ifconfig needs interface.c
  substithing " ifconfig " "networking/interface.c" "$1"

  # Applets that need libunarchive.a
  substithing " ar bunzip2 unlzma cpio dpkg gunzip rpm2cpio rpm tar uncompress unzip dpkg_deb gzip " "archival/libunarchive/libunarchive.a" "$1"

  # Applets that need libcoreutils.a
  substithing " cp mv " "coreutils/libcoreutils/libcoreutils.a" "$1"

  # Applets that need libiproute.a
  substithing " ip " "networking/libiproute/libiproute.a" "$1"

  # What needs -libm?
  substithing " awk dc " "-lm" "$1"

  # What needs -lcrypt?
  substithing " httpd vlock " "-lcrypt" "$1"
}

# Query applets.h to figure out which applets need special treatment

strange_names=`sed -rn -e 's/\#.*//' -e 's/.*APPLET_NOUSAGE\(([^,]*),([^,]*),.*/\1 \2/p' -e 's/.*APPLET_ODDNAME\(([^,]*),([^,]*),.*, *([^)]*).*/\1 \2@\3/p' include/applets.h`

function bonkname()
{
  while [ $# -gt 0 ]
  do
    if [ "$APPLET" == "$1" ]
    then
      APPFILT="${2/@*/}"
      if [ "${APPFILT}" == "$2" ]
      then
        HELPNAME='"nousage\n"'   # These should be _fixed_.
      else
        HELPNAME="${2/*@/}"_full_usage
      fi
      break
    fi
    shift 2
  done
#echo APPLET=${APPLET} APPFILT=${APPFILT} HELPNAME=${HELPNAME} 2=${2}
}

# Iterate through every name in busybox.links

function buildit ()
{
  export APPLET="$1"
  export APPFILT=${APPLET}
  export HELPNAME=${APPLET}_full_usage

  bonkname $strange_names

  j=`find archival console-tools coreutils debianutils editors findutils init loginutils miscutils modutils networking procps shell sysklogd util-linux -name "${APPFILT}.c"`
  if [ -z "$j" ]
  then
    echo no file for $APPLET
  else
    echo "Building $APPLET"
    gcc -Os -o build/$APPLET applets/individual.c $j \
	`extra_libraries $APPFILT` libbb/libbb.a -Iinclude \
	-DBUILD_INDIVIDUAL \
	'-Drun_applet_and_exit(...)' '-Dfind_applet_by_name(...)=0' \
	-DAPPLET_main=${APPFILT}_main -DAPPLET_full_usage=${HELPNAME}
    if [ $? -ne 0 ];
    then
      echo "Failed $APPLET"
    fi
  fi
}

if [ $# -eq 0 ]
then
  for APPLET in `sed 's .*/  ' busybox.links`
  do
    buildit "$APPLET"
  done
else
  buildit "$1"
fi


strip build/*