--version option added.

Makefile

@@ -1,5 +1,5 @@
 PACKAGE = 'package'
-VERSION = '0.1.0'
+VERSION = '0.2.0'
 
 PREFIX := /usr/local
 BINDIR := $(PREFIX)/bin
@@ -8,6 +8,7 @@ SHAREDIR := $(PREFIX)/share
 INCLUDEDIR := $(PREFIX)/include
 MANDIR := $(SHAREDIR)/man
 LIBEXECDIR := $(PREFIX)/libexec
+VERSION := 0.2.0
 
 CC := cc
 AR := ar
@@ -20,7 +21,7 @@ Q := @
 all: package assemble-apk.sh src/config.cr
 	@:
 
-package: src/main.cr src/config.cr src/context.cr src/instructions.cr src/main.cr src/package.cr src/recipe.cr src/sources.cr src/config.cr 
+package: src/main.cr src/config.cr src/context.cr src/exception.cr src/instructions.cr src/main.cr src/package.cr src/recipe.cr src/sources.cr src/spec.cr src/config.cr 
 	@echo '  CR >    package'
 	$(Q)crystal src/main.cr -o 'package'
 
@@ -53,7 +54,7 @@ assemble-apk.sh.uninstall:
 
 src/config.cr: src/config.cr.in src
 	@echo '  SED >   src/config.cr'
-	$(Q)sed -e 's&@PREFIX@&$(PREFIX)&;s&@BINDIR@&$(BINDIR)&;s&@LIBDIR@&$(LIBDIR)&;s&@SHAREDIR@&$(SHAREDIR)&;s&@INCLUDEDIR@&$(INCLUDEDIR)&;s&@MANDIR@&$(MANDIR)&;s&@LIBEXECDIR@&$(LIBEXECDIR)&;' src/config.cr.in > 'src/config.cr'
+	$(Q)sed -e 's&@PREFIX@&$(PREFIX)&;s&@BINDIR@&$(BINDIR)&;s&@LIBDIR@&$(LIBDIR)&;s&@SHAREDIR@&$(SHAREDIR)&;s&@INCLUDEDIR@&$(INCLUDEDIR)&;s&@MANDIR@&$(MANDIR)&;s&@LIBEXECDIR@&$(LIBEXECDIR)&;s&@VERSION@&$(VERSION)&;' src/config.cr.in > 'src/config.cr'
 	$(Q)chmod +x 'src/config.cr'
 
 
@@ -120,11 +121,13 @@ $(PACKAGE)-$(VERSION).tar.gz: distdir
 	$(Q)tar czf $(PACKAGE)-$(VERSION).tar.gz \
 		$(PACKAGE)-$(VERSION)/src/config.cr.in \
 		$(PACKAGE)-$(VERSION)/src/context.cr \
+		$(PACKAGE)-$(VERSION)/src/exception.cr \
 		$(PACKAGE)-$(VERSION)/src/instructions.cr \
 		$(PACKAGE)-$(VERSION)/src/main.cr \
 		$(PACKAGE)-$(VERSION)/src/package.cr \
 		$(PACKAGE)-$(VERSION)/src/recipe.cr \
 		$(PACKAGE)-$(VERSION)/src/sources.cr \
+		$(PACKAGE)-$(VERSION)/src/spec.cr \
 		$(PACKAGE)-$(VERSION)/src/config.cr
 
 dist-xz: $(PACKAGE)-$(VERSION).tar.xz
@@ -133,11 +136,13 @@ $(PACKAGE)-$(VERSION).tar.xz: distdir
 	$(Q)tar cJf $(PACKAGE)-$(VERSION).tar.xz \
 		$(PACKAGE)-$(VERSION)/src/config.cr.in \
 		$(PACKAGE)-$(VERSION)/src/context.cr \
+		$(PACKAGE)-$(VERSION)/src/exception.cr \
 		$(PACKAGE)-$(VERSION)/src/instructions.cr \
 		$(PACKAGE)-$(VERSION)/src/main.cr \
 		$(PACKAGE)-$(VERSION)/src/package.cr \
 		$(PACKAGE)-$(VERSION)/src/recipe.cr \
 		$(PACKAGE)-$(VERSION)/src/sources.cr \
+		$(PACKAGE)-$(VERSION)/src/spec.cr \
 		$(PACKAGE)-$(VERSION)/src/config.cr
 
 dist-bz2: $(PACKAGE)-$(VERSION).tar.bz2
@@ -146,15 +151,17 @@ $(PACKAGE)-$(VERSION).tar.bz2: distdir
 	$(Q)tar cjf $(PACKAGE)-$(VERSION).tar.bz2 \
 		$(PACKAGE)-$(VERSION)/src/config.cr.in \
 		$(PACKAGE)-$(VERSION)/src/context.cr \
+		$(PACKAGE)-$(VERSION)/src/exception.cr \
 		$(PACKAGE)-$(VERSION)/src/instructions.cr \
 		$(PACKAGE)-$(VERSION)/src/main.cr \
 		$(PACKAGE)-$(VERSION)/src/package.cr \
 		$(PACKAGE)-$(VERSION)/src/recipe.cr \
 		$(PACKAGE)-$(VERSION)/src/sources.cr \
+		$(PACKAGE)-$(VERSION)/src/spec.cr \
 		$(PACKAGE)-$(VERSION)/src/config.cr
 
 help:
-	@echo ' :: package-0.1.0'
+	@echo ' :: package-0.2.0'
 	@echo ''
 	@echo 'Generic targets:'
 	@echo '    - help           Prints this help message.'
@@ -176,6 +183,7 @@ help:
 	@echo '    - INCLUDEDIR     ${INCLUDEDIR}'
 	@echo '    - MANDIR         ${MANDIR}'
 	@echo '    - LIBEXECDIR     ${LIBEXECDIR}'
+	@echo '    - VERSION        ${VERSION}'
 	@echo ''
 	@echo 'Project targets: '
 	@echo '    - package        crystal'

project.zsh

@@ -4,6 +4,7 @@ version=0.2.0
 
 variables+=(
 	LIBEXECDIR  '$(PREFIX)/libexec'
+	VERSION     "$version"
 )
 
 targets=(package assemble-apk.sh)

src/config.cr.in

@@ -2,3 +2,7 @@
 # These values are changed by `make` at build-time.
 OWN_LIBEXEC_DIR        = "@LIBEXECDIR@/package"
 
+module Package
+	Version = "@VERSION@"
+end
+

src/main.cr

@@ -42,6 +42,11 @@ OptionParser.parse! do |parser|
 		exit 0
 	}
 
+	parser.on("-V", "--version", "Prints package's version and exits.") {
+		puts Package::Version
+		exit 0
+	}
+
 	parser.invalid_option do |flag|
 		STDERR.puts "ERROR: #{flag} is not a valid option."
 		STDERR.puts parser