added tags (ref #4)

migrations.moon

@@ -1,7 +1,7 @@
 import create_table, rename_column, add_column, types from require "lapis.db.schema"
 import trim from require "lapis.util"
 import process_tags from require "helpers"
-import Tracks from require "models"
+import Tracks, Tags from require "models"
 
 {
   [1]: =>
@@ -47,4 +47,20 @@ import Tracks from require "models"
         track.tags = process_tags "untagged" .. tags
       else
         track.tags = " untagged "
+  [5]: =>
+    create_table "tags", {
+      { "id", types.serial primary_key: true }
+      { "name", types.text unique: true }
+      { "count", types.integer default: -1 }
+    }
+    tags = {}
+    for track in *Tracks\select "*"
+      for name in track.tags\gmatch "%S+"
+        if tags[name]
+          tags[name] += 1
+        else
+          tags[name] = 1
+    for name, count in pairs tags
+      Tags\create { :name, :count }
+
 }

models/Tags.moon

@@ -0,0 +1,10 @@
+import Model, enum from require "lapis.db.model"
+
+class Tags extends Model
+  -- @kinds: enum {
+  --   other: 1
+  --   artist: 2
+  --   mood: 3
+  --   link: 4
+  --   genre: 5
+  -- }