#!/bin/sh -x

# variables
VERSION=hg$(date +"%Y.%m.%d_%H.%M")
BUILD=1


TAG=cyco
OUTPUT=/tmp
TMP=/tmp/$TAG
CWD=$(pwd)

PRGNAM=$(basename $CWD)
PKG=$TMP/pkg-$PRGNAM

ARCH=$(uname -m)

REPOSITORY=/home/installs/SlackBuilds/repositories/$PRGNAM
PREFIX=/usr

# nettoyage préalable
rm -fr $PKG $TMP/$PRGNAM-$VERSION

mkdir -p $PKG

# mise en place
cd $TMP
if [ ! -e $REPOSITORY ] ; then
        mkdir -p $(dirname $REPOSITORY)
        hg clone -r release https://go.googlecode.com/hg/ $(dirname $REPOSITORY)/$PRGNAM
else
    ( cd $REPOSITORY
        hg pull -u
    )
fi

mkdir -p $PKG$PREFIX/libexec/ $PREFIX/libexec/
cp -R $REPOSITORY $PREFIX/libexec/
( cd $PREFIX/libexec/$PRGNAM
    GOROOT=$(pwd)
    GOBIN=$GOROOT/bin
    GOOS=linux
    case $ARCH in
        x86_64)
            GOARCH=amd64
            ;;
        "i?86")
            GOARCH=386
            ;;
        *)
            GOARCH=arm
    esac
    mkdir -p $GOBIN
    find $GOROOT -name ".hg*" -exec rm -fr {} \;
    cd $GOROOT/src
    GOROOT=$GOROOT GOBIN=$GOBIN GOOS=$GOOS GOARCH=$GOARCH bash ./all.bash

    mv $PREFIX/libexec/$PRGNAM $PKG$PREFIX/libexec/

    ( cd misc/emacs
        find . -type f -name \*.el -exec emacs -batch -f batch-byte-compile {} \;
    )
    
    mkdir -p $PKG$PREFIX/bin
    ( cd $PKG$PREFIX/bin
        for i in ../libexec/$PRGNAM/bin/* ; do
            ln -s $i ;
        done
    )

    mkdir -p $PKG$PREFIX/share/emacs/site-lisp/
    ( cd $PKG$PREFIX/share/emacs/site-lisp/
        ln -s ../../../libexec/$PRGNAM/misc/emacs golang
    )
    
    mkdir -p $PKG/etc/profile.d
    cat <<EOF > $PKG/etc/profile.d/go.sh
GOROOT=$PREFIX/libexec/$PRGNAM
GOBIN=\$GOROOT/bin
GOOS=linux
case \$(uname -m) in
    x86_64)
        GOARCH=amd64
        ;;
    "i?86")
        GOARCH=386
        ;;
    *)
        GOARCH=arm
esac

export GOROOT GOBIN GOOS GOARCH
EOF
    chmod +x $PKG/etc/profile.d/go.sh

    mkdir -p $PKG$PREFIX/doc
    ( cd $PKG$PREFIX/doc
        ln -s ../libexec/$PRGNAM/doc $PRGNAM-$VERSION
    )
)

# correction
( cd $PKG
    chown -R root:root *

    [ -d $PKG/usr/man ] && find $PKG/usr/man -type f -name "*.?" -exec gzip -9f {} \;
)

# embaumement
mkdir -p $PKG/install
cat <<EOF > $PKG/install/slack-desc
# HOW TO EDIT THIS FILE:
# The "handy ruler" below makes it easier to edit a package description.  Line
# up the first '|' above the ':' following the base package name, and the '|'
# on the right side marks the last column you can put a character in.  You must
# make exactly 11 lines for the formatting to be correct.  It's also
# customary to leave one space after the ':'.

     |-----handy-ruler------------------------------------------------------|
$PRGNAM: $PRGNAM (a systems programming language)
$PRGNAM:
$PRGNAM: Go is…
$PRGNAM: …simple
$PRGNAM: …fast
$PRGNAM: …safe
$PRGNAM: …concurrent
$PRGNAM: …fun
$PRGNAM: …open source
$PRGNAM:
$PRGNAM: http://golang.org/
EOF

# empaquetage
cd $PKG
makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.txz