appversion

#!/usr/bin/env bash

#######################################################################
# Made by    : Ewoud Dronkert
# Licence    : GNU GPL v3
# Platform   : macOS
# Requires   : bash, python
# Location   : ~/bin/
# Name       : appversion
# Version    : 1.0.0
# Date       : 2017-05-26
# Purpose    : Get version number for macOS application.
#              Checks for .app extension and /Applications path.
# Parameters : -v = verbose
# Settings   : APPDIR = standard applications directory (/Applications)
#            : APPEXT = standard applications extension (.app)
# Exit     0 : No errors
#          1 : mdls not found
#          2 : Argument missing
#          3 : Application not found
#          4 : Version number not found
#######################################################################

APPDIR='/Applications/'
APPEXT='.app'

BIN=$(which mdls)
[ -z "$BIN" ] && { echo 'macOS utility "mdls" not found.' 1>&2; exit 1; }

VERBOSE=false
[ "$1" = "-v" ] && { VERBOSE=true; shift; }

[ -z "$1" ] && { SCR=$(basename "$0"); echo "Useage: $SCR [-v] AppName" 1>&2; exit 2; }
APP="${1%/}"  # Remove trailing slash

# Is it a directory?
if [ ! -d "$APP" ]; then

	# Check for .app extension
	LEN=${#APPEXT}
	EXT="${APP:(-$LEN)}"
	[ "$EXT" != "$APPEXT" ] && APP="$APP$APPEXT"
	if [ ! -d "$APP" ]; then

		# Check for slashes in name
		LEN=${#APP}
		PRE="${APP%%/*}"
		IDX=${#PRE}
		if [ "$IDX" -eq "$LEN" ]; then

			# If no slashes then simply prefix APPDIR
			APP="$APPDIR$APP"
			if [ ! -d "$APP" ]; then

				# Last try: replace supplied path to app with APPDIR
				FULL=$(python -c "import os.path; print(os.path.realpath(os.path.abspath('$APP')))")
				BASE=$(basename "$FULL")
				APP="$APPDIR$BASE"; }
			fi
		fi
	fi
fi

# Still not a directory?
[ ! -d "$APP" ] && { $VERBOSE && echo "App not found : $APP" 1>&2; exit 3; }

# Result
$VERBOSE && echo -n "Version number of $APP : "
VER=$(mdls -name kMDItemVersion "$APP" | grep -oP '[\d.]+')
[ -z "$VER" ] && { $VERBOSE && echo 'not found' 1>&2; exit 4; }
echo "$VER"
exit 0