#!/bin/sh

#

# Generate dependencies from a list of source files

# Check to make sure our environment variables are set

if test x"$INCLUDE" = x -o x"$SOURCES" = x -o x"$objects" = x -o x"$output" = x; then

    echo "SOURCES, INCLUDE, objects, and output needs to be set"

    exit 1

fi

cache_prefix=".#$$"

generate_var()

{

    echo $1 | sed -e 's|^.*/||' -e 's|\.|_|g'

}

search_deps()

{

    base=`echo $1 | sed 's|/[^/]*$||'`

    grep '#include "' <$1 | sed -e 's|.*"\([^"]*\)".*|\1|' | \

    while read file

    do cache=${cache_prefix}_`generate_var $file`

       if test -f $cache; then

          # We already ahve this cached

          cat $cache

          continue;

       fi

       for path in $base `echo $INCLUDE | sed 's|-I||g'`

       do dep="$path/$file"

          if test -f "$dep"; then

             echo "	$dep \\" >$cache

             echo "	$dep \\"

             generate_dep $dep

             break

          fi

       done

    done

}

generate_dep()

{

    cat >>${output}.new <<__EOF__

$1:	\\

`search_deps $1`

__EOF__

}

:>${output}.new

for src in $SOURCES

do  echo "Generating dependencies for $src"

    generate_dep $src

    ext=`echo $src | sed 's|.*\.\(.*\)|\1|'`

    obj=`echo $src | sed "s|^.*/\([^ ]*\)\..*|$objects/\1.lo|g"`

    echo "$obj: $src" >>${output}.new

    case $ext in

        asm) echo "	\$(BUILDASM)" >>${output}.new;;

        cc)  echo "	\$(BUILDCC)" >>${output}.new;;

        c)   echo "	\$(BUILDC)" >>${output}.new;;

        m)   echo "	\$(BUILDM)" >>${output}.new;;

        *)   echo "Unknown file extension: $ext";;

    esac

    echo "" >>${output}.new

done

rm -f ${cache_prefix}*

mv ${output}.new ${output}