#!/bin/sh

# Abort execution as soon as an error is encountered
# That way the script do not let the user think the process completed correctly
# and leave the opportunity to fix the problem and restart compilation where
# it stopped
set -e

# this is where this script will store downloaded files and check for already
# downloaded files
dlwhere="/tmp/rbdev-dl"

# will append the target string to the prefix dir mentioned here
# Note that the user running this script must be able to do make install in
# this given prefix directory. Also make sure that this given root dir
# exists.
prefix="/usr/local"

# This directory is used to extract all files and to build everything in. It
# must not exist before this script is invoked (as a security measure).
builddir="/tmp/rbdev-build"

# This script needs to use GNU Make. On Linux systems, GNU Make is invoked
# by running the "make" command, on most BSD systems, GNU Make is invoked
# by running the "gmake" command. Set the "make" variable accordingly.
if [ -f "`which gmake`" ]; then
    make="gmake"
else
    make="make"
fi

if [ -z $GNU_MIRROR ] ; then
    GNU_MIRROR=ftp://ftp.gnu.org/pub/gnu
fi

# If detection fails, override the value of make manually:
# make="make"

##############################################################################

#
# These are the tools this script requires and depends upon.
reqtools="gcc bzip2 make patch"


findtool(){
  file="$1"

  IFS=":"
  for path in $PATH
  do
    # echo "Checks for $file in $path" >&2
    if test -f "$path/$file"; then
      echo "$path/$file"
      return
    fi
  done
}

input() {
    read response
    echo $response
}

#$1 file
#$2 URL"root
getfile() {
  tool=`findtool curl`
  if test -z "$tool"; then
    tool=`findtool wget`
    if test -n "$tool"; then
      # wget download
      echo "ROCKBOXDEV: Downloading $2/$1 using wget"
      $tool -O $dlwhere/$1 $2/$1
    fi
  else
     # curl download
      echo "ROCKBOXDEV: Downloading $2/$1 using curl"
     $tool -Lo $dlwhere/$1 $2/$1
  fi

  if [ $? -ne 0 ] ; then
      echo "ROCKBOXDEV: couldn't download the file!"
      echo "ROCKBOXDEV: check your internet connection"
      exit
  fi

  if test -z "$tool"; then 
    echo "ROCKBOXDEV: No downloader tool found!"
    echo "ROCKBOXDEV: Please install curl or wget and re-run the script"
    exit
  fi
}

for t in $reqtools; do
  tool=`findtool $t`
  if test -z "$tool"; then
    echo "ROCKBOXDEV: $t is required for this script to work."
    echo "ROCKBOXDEV: Please install $t and re-run the script."
    exit
  fi
done

###########################################################################
# Verify download directory or create it
if test -d "$dlwhere"; then
  if ! test -w "$dlwhere"; then
    echo "$dlwhere exists, but doesn't seem to be writable for you"
    exit
  fi
else
  mkdir $dlwhere
  if test $? -ne 0; then
    echo "$dlwhere is missing and we failed to create it!"
    exit
  fi
  echo "$dlwhere has been created to store downloads in"
fi

echo "Download directory: $dlwhere (edit script to change dir)"
echo "Install prefix: $prefix/[target] (edit script to change dir)"
echo "Build dir: $builddir (edit script to change dir)"

###########################################################################
# Verify that we can write in the prefix dir, as otherwise we will hardly
# be able to install there!
if test ! -w $prefix; then
  echo "WARNING: This script is set to install in $prefix but has no write permissions for it"
  echo "Please fix this and re-run this script"
  exit
fi


###########################################################################
# If there's already a build dir, we don't overwrite it
if test -d $builddir; then
  echo "You already have a $builddir directory!"
  echo "Please remove it and re-run the script"
  exit
fi

cleardir () {
  # $1 is the name of the build dir
  # delete the build dirs and the source dirs
  rm -rf $1/build-gcc $1/build-binu $1/gcc* $1/binutils*
}

buildone () {

arch=$1
gccpatch="" # default is no gcc patch
gccver="4.0.3" # default gcc version
binutils="2.16.1" # The binutils version to use
gccconfigure="" #default is nothing added to configure
binutilsconf="" #default is nothing added to configure

system=`uname -s`
gccurl="http://www.rockbox.org/gcc"

case $arch in
  [Ss])
    target="sh-elf"
    gccpatch="gcc-4.0.3-rockbox-1.diff"
    ;;
  [Mm])
    target="m68k-elf"
    gccver="3.4.6"
    case $system in
      CYGWIN* | Darwin | FreeBSD | Interix)
        gccpatch="gcc-3.4.6.patch"
        ;;
      Linux)
        machine=`uname -m`
        case $machine in
          x86_64)
            gccpatch="gcc-3.4.6-amd64.patch"
            ;;
        esac
        ;;
      *)
        ;;
    esac
    ;;
  [Aa])
    target="arm-elf"
    gccpatch="rockbox-multilibs-arm-elf-gcc-4.0.3_2.diff"
    ;;
  [Ii])
    target="mipsel-elf"
    gccver="4.1.2"
    binutils="2.17"
    gccconfigure="--disable-libssp"
    binutilsconf="--disable-werror"
    # necessary to make binutils build on gcc 4.3+
    case $system in
      Interix)
        gccpatch="gcc-4.1.2-interix.diff"
        ;;
      *)
        ;;
    esac
    ;;
  *)
    echo "An unsupported architecture option: $arch"
    exit
    ;;
esac

bindir="$prefix/$target/bin"
if test -n $pathadd; then
  pathadd="$pathadd:$bindir"
else
  pathadd="$bindir"
fi

mkdir -p $builddir
cd $builddir

summary="summary-$1"

echo "============================ Summary ============================" > $summary
echo "target:              $target" >> $summary
echo "gcc version:         $gccver" >> $summary
if test -n "$gccpatch"; then
    echo "gcc patch:           $gccpatch" >> $summary
fi
echo "binutils:            $binutils" >> $summary
echo "installation target: $prefix/$target" >> $summary
echo "" >> $summary
echo "When done, append $bindir to PATH" >> $summary
echo "=================================================================" >> $summary

cat $summary

echo ""
echo "In case you encounter a slow internet connection, you can use an alternative mirror."
echo "A list of other GNU mirrors is available here: http://www.gnu.org/prep/ftp.html"
echo ""
echo "Usage: GNU_MIRROR=[URL] ./rockboxdev.sh"
echo ""
echo "Example:"
echo "$ GNU_MIRROR=http://mirrors.kernel.org/gnu ./rockboxdev.sh"
echo ""

if test -f "$dlwhere/binutils-$binutils.tar.bz2"; then
  echo "binutils $binutils already downloaded"
else
  getfile binutils-$binutils.tar.bz2 $GNU_MIRROR/binutils
fi

if test -f "$dlwhere/gcc-core-$gccver.tar.bz2"; then
  echo "gcc $gccver already downloaded"
else
  getfile gcc-core-$gccver.tar.bz2 $GNU_MIRROR/gcc/gcc-$gccver
fi

if test -n "$gccpatch"; then
  if test -f "$dlwhere/$gccpatch"; then
    echo "$gccpatch already downloaded"
  else
    getfile "$gccpatch" "$gccurl"
  fi
fi

echo "ROCKBOXDEV: extracting binutils-$binutils in $builddir"
tar xjf $dlwhere/binutils-$binutils.tar.bz2
echo "ROCKBOXDEV: extracting gcc-$gccver in $builddir"
tar xjf $dlwhere/gcc-core-$gccver.tar.bz2

if test -n "$gccpatch"; then
  echo "ROCKBOXDEV: applying gcc patch"
  patch -p0 < "$dlwhere/$gccpatch"
fi

echo "ROCKBOXDEV: mkdir build-binu"
mkdir build-binu
echo "ROCKBOXDEV: cd build-binu"
cd build-binu
echo "ROCKBOXDEV: binutils/configure"
# we undefine _FORTIFY_SOURCE to make the binutils built run fine on recent
# Ubuntu installations
CFLAGS=-U_FORTIFY_SOURCE ../binutils-$binutils/configure --target=$target --prefix=$prefix/$target $binutilsconf
echo "ROCKBOXDEV: binutils/make"
$make
echo "ROCKBOXDEV: binutils/make install to $prefix/$target"
$make install
cd .. # get out of build-binu
PATH="${PATH}:$bindir"
SHELL=/bin/sh # seems to be needed by the gcc build in some cases

echo "ROCKBOXDEV: mkdir build-gcc"
mkdir build-gcc
echo "ROCKBOXDEV: cd build-gcc"
cd build-gcc
echo "ROCKBOXDEV: gcc/configure"
# we undefine _FORTIFY_SOURCE to make the gcc build go through fine on
# recent Ubuntu installations
CFLAGS=-U_FORTIFY_SOURCE ../gcc-$gccver/configure --target=$target --prefix=$prefix/$target --enable-languages=c $gccconfigure
echo "ROCKBOXDEV: gcc/make"
$make
echo "ROCKBOXDEV: gcc/make install to $prefix/$target"
$make install
cd .. # get out of build-gcc
cd .. # get out of $builddir

  # end of buildone() function
}

echo ""
echo "Select target arch:"
echo "s   - sh       (Archos models)"
echo "m   - m68k     (iriver h1x0/h3x0, ifp7x0 and iaudio)"
echo "a   - arm      (ipods, iriver H10, Sansa, etc)"
echo "i   - mips     (Jz4740 and ATJ-based players)"
echo "separate multiple targets with spaces"
echo "(i.e. \"s m a\" will build sh, m86k and arm)"
echo ""

selarch=`input`

for arch in $selarch
do
echo ""
case $arch in
  [Ss])
    buildone $arch
    ;;
  [Ii])
    buildone $arch
    ;;
  [Mm])
    buildone $arch
    ;;
  [Aa])
    buildone $arch
    ;;
  *)
    echo "An unsupported architecture option: $arch"
    exit
    ;;
esac

echo "Cleaning up build folder"
cleardir $builddir
echo ""
echo "Done!"
echo ""
echo "Make your PATH include $pathadd"

done

# show the summaries:
cat $builddir/summary-*