Forgot to add MessageSet.vala in last commit.

src/engine/imap/MessageSet.vala

@@ -0,0 +1,88 @@
+/* Copyright 2011 Yorba Foundation
+ *
+ * This software is licensed under the GNU Lesser General Public License
+ * (version 2.1 or later).  See the COPYING file in this distribution. 
+ */
+
+public class Geary.Imap.MessageSet {
+    public string value { get; private set; }
+    
+    public MessageSet(int msg_num) {
+        assert(msg_num >= 0);
+        
+        value = "%d".printf(msg_num);
+    }
+    
+    public MessageSet.range(int low_msg_num, int count) {
+        assert(low_msg_num > 0);
+        assert(count > 0);
+        
+        value = (count > 1)
+            ? "%d:%d".printf(low_msg_num, low_msg_num + count - 1)
+            : "%d".printf(low_msg_num);
+    }
+    
+    public MessageSet.range_to_highest(int low_msg_num) {
+        assert(low_msg_num > 0);
+        
+        value = "%d:*".printf(low_msg_num);
+    }
+    
+    public MessageSet.scattered(int[] msg_nums) {
+        value = build_scattered_range(msg_nums);
+    }
+    
+    public MessageSet.scattered_to_highest(int[] msg_nums) {
+        value = "%s:*".printf(build_scattered_range(msg_nums));
+    }
+    
+    public MessageSet.multirange(MessageSet[] msg_sets) {
+        StringBuilder builder = new StringBuilder();
+        for (int ctr = 0; ctr < msg_sets.length; ctr++) {
+            unowned MessageSet msg_set = msg_sets[ctr];
+            
+            if (ctr < (msg_sets.length - 1))
+                builder.append_printf("%s:", msg_set.value);
+            else
+                builder.append(msg_set.value);
+        }
+        
+        value = builder.str;
+    }
+    
+    public MessageSet.multiscattered(MessageSet[] msg_sets) {
+        StringBuilder builder = new StringBuilder();
+        for (int ctr = 0; ctr < msg_sets.length; ctr++) {
+            unowned MessageSet msg_set = msg_sets[ctr];
+            
+            if (ctr < (msg_sets.length - 1))
+                builder.append_printf("%s,", msg_set.value);
+            else
+                builder.append(msg_set.value);
+        }
+        
+        value = builder.str;
+    }
+    
+    public MessageSet.custom(string custom) {
+        value = custom;
+    }
+    
+    private static string build_scattered_range(int[] msg_nums) {
+        assert(msg_nums.length > 0);
+        
+        StringBuilder builder = new StringBuilder();
+        for (int ctr = 0; ctr < msg_nums.length; ctr++) {
+            int msg_num = msg_nums[ctr];
+            assert(msg_num >= 0);
+            
+            if (ctr < (msg_nums.length - 1))
+                builder.append_printf("%d,", msg_num);
+            else
+                builder.append_printf("%d", msg_num);
+        }
+        
+        return builder.str;
+    }
+}
+