feat(suggestions): add tags around json (#1441)

lua/avante/suggestion.lua

@@ -110,6 +110,7 @@ L5:     pass
     {
       role = "assistant",
       content = [[
+<suggestions>
 [
   [
     {
@@ -136,6 +137,7 @@ L5:     pass
     },
   ]
 ]
+</suggestions>
           ]],
     },
   }
@@ -165,6 +167,7 @@ L5:     pass
         if cursor_row ~= doc.position.row or cursor_col ~= doc.position.col then return end
         -- Clean up markdown code blocks
         full_response = Utils.trim_think_content(full_response)
+        full_response = full_response:gsub("<suggestions>\n(.-)\n</suggestions>", "%1")
         full_response = full_response:gsub("^```%w*\n(.-)\n```$", "%1")
         full_response = full_response:gsub("(.-)\n```\n?$", "%1")
         -- Remove everything before the first '[' to ensure we get just the JSON array

lua/avante/templates/suggesting.avanterules

@@ -36,6 +36,37 @@ Your task is to suggest code modifications at the cursor position. Follow these
       start_row: The starting row of the code snippet you want to replace, start from 1, inclusive
       end_row: The ending row of the code snippet you want to replace, start from 1, inclusive
       content: The suggested code you want to replace the original code with
+  3. JSON must be wrapped with <suggestions></suggestions> tags, for example:
+    {% raw %}
+    <suggestions>
+    [
+      [
+        {
+          "start_row": 1,
+          "end_row": 1,
+          "content": "Your suggested code here"
+        },
+        {
+          "start_row": 3,
+          "end_row": 9,
+          "content": "Your suggested code here"
+        }
+      ],
+      [
+        {
+          "start_row": 2,
+          "end_row": 6,
+          "content": "Your suggested code here"
+        },
+        {
+          "start_row": 9,
+          "end_row": 22,
+          "content": "Your suggested code here"
+        }
+      ]
+    ]
+    </suggestions>
+    {% endraw %}
 
 Guidelines:
   1. Make sure you have maintained the user's existing whitespace and indentation. This is REALLY IMPORTANT!