#!/bin/bash

version=0.10
program=${0##*/}
progdir=${0%/*}
if [ "$progdir" = "$program" ]; then progdir="."; fi

# ----------------------------------------------------------------------
function usage() {
    cat <<EOF
NAME
	$program - Make a release

SYNOPSIS
	$program [OPTIONS] VERSION

DESCRIPTION

	Do the sequence of actions necesary to properly produce a release
	branch. This includes updating the project version and committing that
	to the repository, creating a release tag and a release branch if
	needed, and updating the project version again to indicate that any
	further commits are development work. Requires 1 argument: the VERSION
	number (e.g., 1.23).

	The script uses svn info to retrieve information about the repository
	and path of the current directory, and inspects that to determine
	exactly what to do. If the current path relative to the repository root
	starts with 'trunk', then a new branch is created named
	branch/\$VERSION. If the current path starts with something else 
	than 'trunk', it is assumed to be a working branch, and no new branch is
	created. In either case, a copy of the current working copy is created
	in tags/\$VERSION.

EOF
    echo -e "OPTIONS"
    if   [ "$(uname)" = "Linux" ]; then
        egrep "^[	]+[-][A-Za-z| -]+\*?\)[	]+[A-Za-z].+#" $0 | tr -s "\t|" "\t," | sed -r -e 's/\)[ \t]+([A-Z]+)=\$2[^#]*#/=\1\t/' -e 's/\)[^#]*#/\t/'
    else
        egrep "^[	]+[-][A-Za-z| -]+\*?\)[	]+[A-Za-z].+#" $0 | sed 's/\|.*\$2[^#]*#/	/'| sed -E 's/\|.*\)[^#]*#/	/'
    fi
    cat <<EOF

AUTHOR
	Written by Henrik Levkowetz, <henrik@levkowetz.com>

COPYRIGHT
	Copyright 2007 The IETF Trust.

EOF

}

# ----------------------------------------------------------------------
function die() {
    echo -e "\n$program: error: $*" > /dev/stderr
    exit 1
}

function note() { 
	if [ -n "$VERBOSE" ]; then echo -e "$*"; fi
}

# ----------------------------------------------------------------------
function version() {
	echo -e "$program $version"
}

# ----------------------------------------------------------------------
trap 'echo "$program($LINENO): Command failed with error code $? ([$$] $0 $*)"; exit 1' ERR


# ----------------------------------------------------------------------
# Option parsing

# Options
shortopts=hnvV
longopts=help,dry-run,verbose,version

# Default values
MSG=""
VERFILE=ietf/__init__.py
SETTINGS=ietf/settings.py
do=""

if   [ "$(uname)" = "Linux" ]; then
    args=$(getopt -o "$shortopts" --long "$longopts" -n '$program' -- $SV "$@")
    if [ $? != 0 ] ; then die "Terminating..." >&2 ; exit 1 ; fi
    eval set -- "$args"
    sed="sed -r"
else
    # Darwin, BSDs
    args=$(getopt -o$shortopts $SV $*)
    if [ $? != 0 ] ; then die "Terminating..." >&2 ; exit 1 ; fi
    set -- $args
    sed="sed -E"
fi

while true ; do
    case "$1" in
	-h| --help)		usage; exit;;	#	 Show this help, then exit
	-m| --message)		MSG=$2; shift;;		# Specify a commit message
	-n| --dry-run)		do="echo";;	#	 Show what would be done	
	-v| --verbose)		VERBOSE=1;;	#	 Be more talkative
	-V| --version)		version; exit;;	#	 Show program version, then exit
	--)			shift; break;;
	*) die "Internal error, inconsistent option specification: '$1'";;
    esac
    shift
done

# ----------------------------------------------------------------------
# The program itself

ARGMIN=1

if [ $# -lt $ARGMIN ]; then
    usage
    die "$# arguments found, $ARGMIN required"
fi

VER=$1

REPO=$(svn info | grep "^Repository Root:" | awk '{ print $3 }')
RURL=$(svn info | grep "^URL:" | awk '{ print $2 }')
RDIR=${RURL#$REPO}
DIR=${RDIR#/}
if   [ -z "$DIR" ]; then
    die "Couldn't find anything to release here"
elif [ "${DIR%%/*}" = "trunk" ]; then
    SRC="trunk"
elif [ "${DIR%%/*}" = "branch" ]; then
    tmp=${DIR#*/}		# get rid of 'branch/'
    SRC="branch/${tmp%%/*}"	# keep first subdir under branch/
fi

note ""
note "Releasing from $SRC"

note "Locating the root of the working copy..."
while [ "${#DIR}" -gt "${#SRC}" ]; do
    [ "$DIR" = "$prev" ] && die "Internal error"
    cd ..
    note "  now at $PWD"
    prev=$DIR
    DIR=${DIR%/*}
done
if [ "$DIR" != "$SRC" ]; then
    die "Couldn't find the root of your '$SRC' working copy"
fi

REPO=${REPO%/}				# remove trailing slash
SRC=${SRC#/}				# remove leading slash

MAJOR=${VER%.*}
MINOR=${VER#*.}
VER="$(printf %d.%02d $MAJOR $MINOR)"
NEXT=$(( $MINOR + 1 ))
DEV="$(printf %d.%02d-dev $MAJOR $NEXT)"


note "Verifying that version $VER doesn't already exist..."
svn info $REPO/tags/$VER 2>&1 | grep -q "Not a valid URL" || die "The tag '$VER' already exists (or there was an error testing for it)."
note "  Ok"

note "Verifying there's no uncommitted changes..."
$do svn st | grep "^[AMGRD] " && die "There seems to be uncommitted changes in this working copy"

note "\nUpdating the version info in $VERFILE and making sure'\$Rev\$' is Ok"
$do sed -i -r -e "/^__version__/s/\"[.0-9]+(-dev)?\"/\"$VER\"/" \
	  -e "/^__rev__/s/\".*\"/\"\$Rev:\$\"/" \
	$VERFILE

note "\nUpdating the deployment settings in settings.py"
$do sed -i -r -e 's/^DEBUG *= *.*$/DEBUG = False/' \
	      -e "s/^SERVER_MODE *= *.*\$/SERVER_MODE = 'production'/" \
	$SETTINGS

note "\nCommitting version information for version $VER: $MSG"
$do svn commit $VERFILE $SETTINGS -m "Set version info to release version $VER before branching. $MSG"

note "\nCreating new tag 'tags/$VER' from $SRC"
$do svn cp $REPO/$SRC $REPO/tags/$VER -m "Creating new tag 'tags/$VER' from $SRC"

note "\nUpdating version and revision info to indicate that the source and branch aren't releases"
$do sed -i -r -e "/^__version__/s/\"[0-9.]*\"/\"$DEV\"/" \
	      -e "/^__rev__/s/\"\\\$Rev: (.*) \\\$\"/\"\$Rev:\$ (dev) Latest release: Rev. \1 \"/" \
	$VERFILE

note "\nUpdating the deployment settings in settings.py to development mode"
$do sed -i -r -e 's/^DEBUG *= *.*$/DEBUG = True/' \
	      -e "s/^SERVER_MODE *= *.*\$/SERVER_MODE = 'development'/" \
	$SETTINGS

note "\nCommitting the updated version and deployment settings"
$do svn commit $VERFILE $SETTINGS -m "Set version info and settings back to development mode"

# if SRC is 'trunk', then also create a new branch
if [ $SRC = "trunk" ]; then
    if svn info $REPO/branch/$VER 2>&1 | grep -q "Not a valid URL"; then
	note "\nCreating new branch 'branch/$VER' from $SRC"
	$do svn cp $REPO/$SRC $REPO/branch/$VER -m "Creating new branch 'branch/$VER' from $SRC"
    fi

    note "\nUpdating version and revision info on trunk"
    $do sed -i -r -e "/^__version__/s/\"[0-9.]*\"/\"$MAJOR.xx-trunk\"/" \
	          -e "/^__rev__/s/\"\\\$Rev: (.*) \\\$\"/\"\$Rev:\$ (dev) Latest release: Rev. \1 \"/" \
	$VERFILE

    note "Commit version information '$MAJOR.xx-trunk'"
    $do svn commit $VERFILE $SETTINGS -m "Set version of the trunk to $MAJOR.xx-trunk after branching off $VER"
fi

$do svn update