refactor 'make dist' archive creation into a shell script

Makefile

@@ -1,35 +1,8 @@
-EXTENSIONS:=inkstitch
-
-# This gets the branch name or the name of the tag
-VERSION:=$(subst /,-,$(TRAVIS_BRANCH))
-OS:=$(TRAVIS_OS_NAME)
-ARCH:=$(shell uname -m)
 
 dist: locales inx
-	bin/build-dist $(EXTENSIONS)
+	bin/build-python
 	bin/build-electron
-	cp -a images/examples dist/inkstitch
-	cp -a palettes dist/inkstitch
-	cp -a symbols dist/inkstitch
-	cp -a fonts dist/inkstitch
-	cp -a icons dist/inkstitch/bin
-	cp -a locales dist/inkstitch/bin
-	cp -a print dist/inkstitch/bin
-	if [ "$$BUILD" = "osx" ]; then \
-	    cp -a electron/dist/mac dist/inkstitch/electron; \
-	else \
-	    cp -a electron/dist/*-unpacked dist/inkstitch/electron; \
-	fi
-	for d in inx/*; do \
-		lang=$${d%.*}; \
-		lang=$${lang#*/}; \
-		cp $$d/*.inx dist; \
-		if [ "$$BUILD" = "windows" ]; then \
-			cd dist; zip -r ../inkstitch-$(VERSION)-win32-$$lang.zip *; cd ..; \
-		else \
-			cd dist; tar zcf ../inkstitch-$(VERSION)-$(OS)-$(ARCH)-$$lang.tar.gz *; cd ..; \
-		fi; \
-	done
+	bin/build-distribution-archives
 
 distclean:
 	rm -rf build dist inx locales *.spec *.tar.gz *.zip electron/node_modules electron/dist

bin/build-distribution-archives

@@ -0,0 +1,27 @@
+# TRAVIS_BRANCH is the branch name or the name of the tag.
+VERSION="$(echo ${TRAVIS_BRANCH} | tr / -)"
+OS="${TRAVIS_OS_NAME}"
+ARCH="$(uname -m)"
+
+cp -a images/examples palettes symbols fonts dist/inkstitch
+cp -a icons locales print dist/inkstitch/bin
+
+if [ "$BUILD" = "osx" ]; then
+    cp -a electron/dist/mac dist/inkstitch/electron
+else
+    cp -a electron/dist/*-unpacked dist/inkstitch/electron
+fi
+
+for d in inx/*; do
+	lang=${d%.*}
+	lang=${lang#*/}	
+	cp $d/*.inx dist
+
+    cd dist
+	if [ "$BUILD" = "windows" ]; then
+		zip -r ../inkstitch-${VERSION}-win32-${lang}.zip *
+	else
+		tar zcf ../inkstitch-${VERSION}-${OS}-${ARCH}-$lang.tar.gz *
+	fi
+	cd ..
+done