#!/usr/bin/env bash
#=============================================================================
# bash script to assist in creating a new library release.
# Created by Bill Perry 2016-08-01
# bperrybap@opensource.billsworld.billandterrie.com
#
# the script will:
# - update version strings in the library files.
# optionally:
# 	- commit updated files
# 	- create tag using supplied revision string
#
# 
# To use, just run script.
# if argument is given it will be assumd to be the revision string
# if not, it will prompt for input.
#
# script will prompt to optionally commit updates, & tag the updated repo
#
# Note:
# It is recommend that all other change be commited prior to running script
#
#=============================================================================

# location of root repository directory relative to directory where script lives
repodir=../..

#get name & location of this script
progname=`basename $0`
progwd=`dirname $0`

# pre/post/patcher scripts
# (assume in same dirctory with this scketh)
PREPATCHER=$progwd/mkreleasePrePatcher
PATCHER=$progwd/mkreleasePatcher
POSTPATCHER=$progwd/mkreleasePostPatcher


#make sure script running where script lives
cd $progwd

# check to see if on master branch and ask to proceed if not
git rev-parse --abbrev-ref HEAD |grep -q master
if [ $? -ne 0 ]
then
	while
		read -e -p "Not on master branch; continue?:" -i "n" yesno
		[ "$yesno" = "" ]
	do
		:;
	done
fi
if [ "$yesno" = "n" ]
then
	exit 0
fi

# check to see if there are uncommitted changes and ask to proceed if so
git diff-index --quiet HEAD --
if [ $? -ne 0 ]
then
	while
		read -e -p "Uncommitted changes; continue?:" -i "n" yesno
		[ "$yesno" = "" ]
	do
		:;
	done
fi
if [ "$yesno" = "n" ]
then
	exit 0
fi


#check to see if version string passed in
#if not then ask for it interactively
if [ $# = 1 ]
then
	rawverstr=$1
else
	while
		read -e -p "Version:" rawverstr;
		[ "$rawverstr" = "" ]
	do
		:;
	done
fi

#
# create RETARDED SemVer compliant Revision string by sanitizing input string
# http://semver.org/
# this uses sed to alter a string to be @#$@$ SEMVER compliant
# it will work as long as the version used starts with a version number that is
# either 2 digits or 3 digits. Example 1.0 1.0.0 
# string will be massaged to ensure compliance should tags used not be SEMVER
# compliant. i.e. v1.2rc1 will be turned into 1.2.0-rc1
#
# shown here is how each "-e" works:
# - strip out leading a leading leading non numeric chars (like 'v')
#  will change a tag of v1.0 to 1.0 trailing strings after digits are left alone
#
# - convert 2 digit version numbers to 3 digit numbers
#  will change #.# to #.#.0 trailing strings are left alone
#
# - change a period after the 3rd version digit to a dash
#  will change #.#.#.foo to #.#.#-foo
#
# - insert a "-" afer the 3rd version digit if the character is not already a - or a +
#   handles case of changing #.#.#foo to #.#.#-foo
#
#
VERSIONSTR=$(echo $rawverstr | sed -e 's/^\([^0-9]*\)\(.*\)/\2/' -e 's/^\([0-9][0-9]*\.[0-9][0-9]*\)\($\|[^\.].*\|\.[^0-9].*\)/\1.0\2/' -e 's/^\([0-9][0-9]*\.[0-9][0-9]*.[0-9][0-9]*\)\.\(.*\)/\1-\2/' -e 's/^\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\)\([^0-9+-].*\)/\1-\2/')

#extract out the major, minor, and point version numbers from the semver version string
MAJ=$(echo $VERSIONSTR | sed -e 's/^\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\)\(.*\)/\1/')
MIN=$(echo $VERSIONSTR | sed -e 's/^\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\)\(.*\)/\2/')
 PT=$(echo $VERSIONSTR | sed -e 's/^\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\)\(.*\)/\3/')

#debug
#echo VERSIONSTR $VERSIONSTR
#echo MAJ $MAJ
#echo MIN $MIN
#echo PT $PT

# create a single numeric version number from the components.
# format is MMmmPP so each version digit consumes two decimal digits
# leading zeros are dropped to prevent number being octal
# Examples:
# 1.2.3 would be 10203
# 1.0.0 would be 10000
# 0.5.0 would be 500 (can't start with 0 as that means octal)

# drop the Major number if 0 since we don't want an octal number
if [ $MAJ -ne 0 ]
then
	VERSION=`printf "%d%02d%02d" $MAJ $MIN $PT`
else
	# drop the Minor number if 0 when MAJ is 0 ince we don't want an octal number
	if [ $MIN -ne 0 ]
	then
		VERSION=`printf "%d%02d" $MIN $PT`
	else
		VERSION=`printf "%d" $PT`
	fi
fi

#debug
#echo $progname: "setting    VERSION to $VERSION"
#echo $progname: "setting VERSIONSTR to $VERSIONSTR"

# check to see if a prepatcher script exists, if does does,
# call prepatcher script to do anything needed before doing patching
if [ -e $PREPATCHER ]
then
	$PREPATCHER
	if [ $? -ne 0 ]
	then
		echo "$progname: error pre patching files"
		exit 1
	fi
fi


# call patcher script to do the actual file patching
# hand patch all the version information and let it do its thing...
$PATCHER "$VERSIONSTR" "$VERSION" "$MAJ" "$MIN" "$PT"
if [ $? -ne 0 ]
then
	echo "$progname: error patching version files"
	exit 1
fi

# check to see if a postpatcher script exists, if does does,
# call postpatcher script to do anything needed after doing patching
if [ -e $POSTPATCHER ]
then
	$POSTPATCHER
	if [ $? -ne 0 ]
	then
		echo "$progname: error post patching files"
		exit 1
	fi
fi

# ask if changes should be committed and tagged

while
	read -e -p "Commit & Tag Release version updates?:" -i "n" yesno
	[ "$yesno" = "" ]
do
	:;
done

if [ "$yesno" = "y" ]
then
	gitcomment="update version info for $VERSIONSTR release"
	echo commiting changes to git with comment: $gitcomment
	git commit -a -m "$gitcomment"
	echo "setting git tag to $VERSIONSTR"
	git tag -a $VERSIONSTR -m "Release of library version $VERSIONSTR"
fi

echo "---"
read -n1 -p "Press any key to exit"
echo