get tarball name from npm pack

npm2git.sh

@@ -7,17 +7,17 @@ cd $(git rev-parse --show-toplevel)
 # get commit id
 ORIG_COMMIT="$(git rev-parse HEAD)"
 
-# extract package name and version from package.json, remove scripts.prepare
+# extract version from package.json, and remove scripts.prepare
 ORIG_PKG="$(cat package.json)"
-read PKG_NAME PKG_VERSION < <(node -e '
+PKG_VERSION="$(node -e '
 	const fs = require("fs");
 	const pkg = JSON.parse(fs.readFileSync("package.json"));
 	if (pkg.scripts && pkg.scripts.prepare) {
 		delete pkg.scripts.prepare;
 		fs.writeFileSync("package.json", JSON.stringify(pkg, null, "\t") + "\n");
 	}
-	console.log(pkg.name + " " + pkg.version);
-')
+	console.log(pkg.version);
+')"
 
 # determine current branch name, and create new temporary branch
 ORIG_BRANCH=$(git symbolic-ref --short HEAD)
@@ -26,9 +26,9 @@ git checkout --orphan=${TEMP_BRANCH}
 git rm --cached -rf .
 
 # track the files that should be included in the published package
-npm pack
-git add -f $(tar tf ${PKG_NAME}-${PKG_VERSION}.tgz | cut -c 9-)
-rm ${PKG_NAME}-${PKG_VERSION}.tgz
+PKG_TAR="$(npm pack | tail -n 1)"
+git add -f $(tar tf ${PKG_TAR} | cut -c 9-)
+rm ${PKG_TAR}
 
 # commit and tag
 git commit -m "v${PKG_VERSION} @ ${ORIG_COMMIT}"