modify npm check method

In previous versions of node.js, default output is 0, in latest version default output is 1. Use `npm version` to check whether npm is correctly installed.
renkun-ken · Jul 30, 2014 · ebb55a0 · ebb55a0
1 parent 4b783da
commit ebb55a0
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/R/checkForGitbook.R b/R/checkForGitbook.R
@@ -6,7 +6,7 @@
 #' @param quiet logical indicating whether messages should be printed.
 #' @export
 checkForGitbook <- function(quiet=FALSE) {
-	if(system('npm', ignore.stdout=TRUE) != 0) {
+	if(system('npm version', ignore.stdout=TRUE) != 0) {
 		stop("Cannot find node.js. You can install it from http://nodejs.org/download/")
 	}
 	if(system('gitbook', ignore.stdout=TRUE) != 0) {