npm: crawl the root dev dependencies, like npm ls does.

Fixes #21

dep/crawl/crawl.go

@@ -106,7 +106,7 @@ func Crawl(repourl, dataDir string, l *log.Logger) <-chan Result {
 	go func() {
 		// queue the initial children to explore
 		// we don't create a dep for the starting point
-		_, cdids := processRepo(repourl, l)
+		_, cdids := processRepo(repourl, true, l)
 		push(cdids)
 
 		// explore the graph concurrently until there are no more depnames queued
@@ -150,16 +150,23 @@ func processDepID(id dep.ID, dataDir string, l *log.Logger) (r dep.Dep, childDep
 		return dep.Dep{}, nil
 	}
 
-	c, cdns := processRepo(dir, l)
+	c, cdns := processRepo(dir, false, l)
 	return dep.Dep{
 		ID:   id,
 		Conf: c,
 	}, cdns
 }
 
-func processRepo(path string, l *log.Logger) (*conf.Config, []dep.ID) {
+func processRepo(path string, isRoot bool, l *log.Logger) (*conf.Config, []dep.ID) {
+	opts := npm.Options{
+		Dependencies: true,
+	}
+	if isRoot {
+		opts.DevDependencies = true
+		opts.PeerDependencies = true
+	}
 	var r []dep.ID
-	ds := npm.Dependencies(path, l)
+	ds := npm.Dependencies(path, opts, l)
 	r = append(r, ds...)
 	ds, err := golang.Dependencies(path)
 	if err != nil {

dep/npm/npm.go

@@ -31,9 +31,10 @@ type dist struct {
 }
 
 type pkg struct {
-	Name            string            `json:"name"`
-	Dependencies    map[string]string `json:"dependencies"`
-	DevDependencies map[string]string `json:"devDependencies"`
+	Name             string            `json:"name"`
+	Dependencies     map[string]string `json:"dependencies"`
+	DevDependencies  map[string]string `json:"devDependencies"`
+	PeerDependencies map[string]string `json:"peerDependencies"`
 }
 
 func httpClient(l *log.Logger) *retryablehttp.Client {
@@ -80,7 +81,13 @@ func Dir(name, dataDir string, l *log.Logger) string {
 	return p
 }
 
-func Dependencies(repoPath string, l *log.Logger) []dep.ID {
+type Options struct {
+	Dependencies     bool
+	DevDependencies  bool
+	PeerDependencies bool
+}
+
+func Dependencies(repoPath string, opts Options, l *log.Logger) []dep.ID {
 	// parse the manifest
 	pf, err := os.Open(path.Join(repoPath, "package.json"))
 	if err != nil {
@@ -99,8 +106,18 @@ func Dependencies(repoPath string, l *log.Logger) []dep.ID {
 	}
 
 	// return dependencies
+	depss := []map[string]string{}
+	if opts.Dependencies {
+		depss = append(depss, pj.Dependencies)
+	}
+	if opts.DevDependencies {
+		depss = append(depss, pj.DevDependencies)
+	}
+	if opts.PeerDependencies {
+		depss = append(depss, pj.PeerDependencies)
+	}
 	var r []dep.ID
-	for _, deps := range []map[string]string{pj.Dependencies} { // TODO: add devDependencies, peerDependencies
+	for _, deps := range depss {
 		for d := range deps {
 			r = append(r, dep.ID{
 				Type: dep.NPM,