made release.sh nicer

release.sh

@@ -2,23 +2,23 @@
 
 set -e
 
-pkg=mediaextract-`git describe --tags`
+pkg=mediaextract-$(git describe --tags)
 
-rm -r $pkg $pkg.zip 2>/dev/null || echo
-git clone . $pkg/source
-rm -rf $pkg/source/.git $pkg/source/.gitignore
-mv $pkg/source/README.md $pkg
+rm -r "$pkg" "$pkg.zip" 2>/dev/null || echo
+git clone . "$pkg/source"
+rm -rf "$pkg/source/.git" "$pkg/source/.gitignore"
+mv "$pkg/source/README.md" "$pkg"
 for target in linux32 linux64 win32 win64; do
 	builddir=build-$target
-	make TARGET=$target || exit $?
-	if [ -d $builddir ]; then
-		mkdir $pkg/$builddir
+	make TARGET=$target "-j$(nproc)"
+	if [[ -d "$builddir" ]]; then
+		mkdir "$pkg/$builddir"
 
-		if [ -f $builddir/mediaextract ]; then
-			cp $builddir/mediaextract $pkg/$builddir
-		elif [ -f $builddir/mediaextract.exe ]; then
-			cp $builddir/mediaextract.exe $pkg/$builddir
+		if [[ -f "$builddir/mediaextract" ]]; then
+			cp "$builddir/mediaextract" "$pkg/$builddir"
+		elif [ -f "$builddir/mediaextract.exe" ]; then
+			cp "$builddir/mediaextract.exe" "$pkg/$builddir"
 		fi
 	fi
 done
-zip -r9 $pkg.zip $pkg
+zip -r9 "$pkg.zip" "$pkg"