#!/bin/bash

# Shave and a Haircut
# (c) 2019 Epic Games
# US Patent 6720962

# Returns six words, separated by spaces: raw normal major minor release dir
#
# 'raw' is the compact version used in MAYA_API_VERSION (e.g. "201500" prior
# to Maya 2018, "20180000" from Maya 2018 onward)
#
# 'normal' is the version number by which Maya is known. E.g. "2015"
# Although there may be multiple releases of Maya within a year (e.g. Maya 2015
# SP1, Maya 2015 Extension 1) they are normally all binary compatible and will
# have the same 'normal' version number (e.g. "2015"). However, there are
# occasional exceptions. For example two binary incompatible versions of Maya
# 2016 were released: Maya 2016 ('normal' value "2016") and Maya 2016 Extension
# 2 ('normal' value "2016.5").
#
# 'major' is the major version number
#
# 'minor' is the minor version number. Usually this is "0" except in those cases
# where multiple versions of Maya were made in the same year. For example, for
# Maya 2016.5 this will contain "5".
#
# 'release' is the incremental release number within a version of Maya. For
# example, if the 'raw' version is "201507" then the 'release' will be "7".
# From Maya 2018 onward, the release number is 4 digits long, so a 'raw'
# version of "20180123" would give a 'release' of "123".
#
# 'dir' is the version number as it appears in Maya's install path. On MacOS
# and Windows this will be the same as the 'normal' version number but on Linux
# some versions of Maya include a '-x64' suffix in their path
# (e.g. "2015-x64").
#
# From a Makefile these can easily be accessed as follows:
#
#	versionInfo := $(shell getMayaAPIVersion.sh)
#	raw     := $(word 1,$(versionInfo))
#	normal  := $(word 2,$(versionInfo))
#	major   := $(word 3,$(versionInfo))
#	minor   := $(word 4,$(versionInfo))
#	release := $(word 5,$(versionInfo))
#	dir     := $(word 6,$(versionInfo))
#
# From a csh or tcsh script:
#
#	set versionInfo = `getMayaAPIVersion.sh`
#	set raw     = ${versionInfo[1]}
#	set normal  = ${versionInfo[2]}
#	set major   = ${versionInfo[3]}
#	set minor   = ${versionInfo[4]}
#	set release = ${versionInfo[5]}
#	set dir     = ${versionInfo[6]}
#
# From a Bourne shell or bash script:
#
#	versionInfo=(`getMayaAPIVersion.sh`)
#	raw=${versionInfo[0]}
#	normal=${versionInfo[1]}
#	major=${versionInfo[2]}
#	minor=${versionInfo[3]}
#	release=${versionInfo[4]}
#	dir=${versionInfo[5]}
#
if [ "${MAYA_LOCATION}" = "" ]; then
    echo "getMayaVersion:error: MAYA_LOCATION not defined." >&2
    exit 1
fi

if [ ! -d ${MAYA_LOCATION} ]; then
    echo "getMayaVersion:error: MAYA_LOCATION contains '${MAYA_LOCATION}', which does not exist." >&2
    exit 2;
fi

versionFile=${MAYA_LOCATION}/include/maya/MTypes.h

# Prior to Maya 2016, the API 'includes' directory was inside the 'devkit'
# directory. Now it's at the same level as 'devkit', like Linux.
#
if [ "`uname -s`" == "Darwin" ]; then
    if [ ! -r ${versionFile} ]; then
    	versionFile=${MAYA_LOCATION}/devkit/include/maya/MTypes.h
	fi
fi

if [ ! -r ${versionFile} ]; then
    echo "getMayaVersion:error: File '${versionFile}' does not exist." >&2
    exit 4
fi

compact=`grep '^[ \t]*\#define[ \t]*MAYA_API_VERSION' ${versionFile} | sed 's/^[^0-9]*//'`
major=`echo ${compact} | sed 's/\(.*\)[0-9][0-9]$/\1/'`

# From Maya 2018 onward the API version number is 8 digits long.

if [ ${major} -gt 2017 ]; then
    major=`echo ${compact} | sed 's/\(.*\)[0-9][0-9][0-9][0-9]$/\1/'`
    release=`echo ${compact} | sed 's/.*\([0-9][0-9][0-9][0-9]\)$/\1/'`
else
    release=`echo ${compact} | sed 's/.*\([0-9][0-9]\)$/\1/'`
fi

# Strip leading zeroes from the release number.
release=`echo ${release} | sed 's/^0*//'`

# If the release string is empty, set it to zero.
if [ "${release}" == "" ]; then
    release=0
fi

combined=${major}
minor=0

# Special handling for Maya 2013.5 & 2016.5
if [ \( ${major} -eq 2013 -o ${major} -eq 2016 \) -a ${release} -ge 50 ]; then
    combined=${major}.5
    minor=5
fi

if `echo ${MAYA_LOCATION} | grep -q '[-]x64'`; then
    dir=${combined}-x64
else
    dir=${combined}
fi

echo ${compact} ${combined} ${major} ${minor} ${release} ${dir}