Issue 1233: product filter should only match if name begins withs search term

app/assets/javascripts/darkswarm/filters/filter_products.js.coffee

@@ -5,4 +5,4 @@ Darkswarm.filter 'products', (Matcher) ->
     return products if text == ""
     products.filter (product) =>
       propertiesToMatch = [product.name, product.variant_names, product.supplier.name, product.primary_taxon.name]
-      Matcher.match propertiesToMatch, text
+      Matcher.matchBeginning propertiesToMatch, text

app/assets/javascripts/darkswarm/services/matcher.js.coffee

@@ -1,7 +1,16 @@
 Darkswarm.factory "Matcher", ->
-  # Match text fragment in an array of strings.
   new class Matcher
+
+    # Match text fragment in an array of strings.
     match: (properties, text)->
       properties.some (prop)->
         prop ||= ""
         prop.toLowerCase().indexOf(text.toLowerCase()) != -1
+
+    # Return true if text occurs at the beginning of any word present in an array of strings
+    matchBeginning: (properties, text) ->
+      text = text.trim()
+      properties.some (prop) ->
+        prop ||= ""
+        prop.split(' ').some (word) ->
+          word.toLowerCase().indexOf(text.toLowerCase()) == 0