providers: Add provider for URL functions

providers/url/url.go

@@ -0,0 +1,30 @@
+package url
+
+import "net/url"
+import "html/template"
+import "git.tebibyte.media/sashakoshka/step"
+
+var _ step.FuncProvider = new(Provider)
+
+// Provider provides URL functions.
+type Provider struct {
+	
+}
+
+// FuncMap fulfills the step.FuncProvider interface.
+func (this *Provider) FuncMap () template.FuncMap {
+	return template.FuncMap {
+		"parseQuery": funcParseQuery,
+	}
+}
+
+func funcParseQuery (query string) url.Values {
+	// wrapped here because the query might contain all sorts of nonsense,
+	// and returning an error in a template function causes everything to
+	// stop rather ungracefully
+	values, err := url.ParseQuery(query)
+	if err != nil {
+		values = make(url.Values)
+	}
+	return values
+}