fix: keep correct indentation (#710)

lua/avante/sidebar.lua

@@ -415,6 +415,7 @@ local function insert_conflict_contents(bufnr, snippets)
     local start_line, end_line = unpack(snippet.range)
 
     local need_prepend_indentation = false
+    local start_line_indentation = ""
     local original_start_line_indentation = Utils.get_indentation(lines[start_line] or "")
 
     local result = {}
@@ -428,10 +429,15 @@ local function insert_conflict_contents(bufnr, snippets)
 
     for idx, line in ipairs(snippet_lines) do
       if idx == 1 then
-        local indentation = Utils.get_indentation(line)
+        start_line_indentation = Utils.get_indentation(line)
-        need_prepend_indentation = indentation ~= original_start_line_indentation
+        need_prepend_indentation = start_line_indentation ~= original_start_line_indentation
+      end
+      if need_prepend_indentation then
+        if line:sub(1, #start_line_indentation) == start_line_indentation then
+          line = line:sub(#start_line_indentation + 1)
+        end
+        line = original_start_line_indentation .. line
       end
-      if need_prepend_indentation then line = original_start_line_indentation .. line end
       table.insert(result, line)
     end
 
@@ -445,7 +451,7 @@ end
 ---@param codeblocks table<integer, any>
 local function is_cursor_in_codeblock(codeblocks)
   local cursor_line, _ = Utils.get_cursor_pos()
-  cursor_line = cursor_line - 1 -- 转换为 0-indexed 行号
+  cursor_line = cursor_line - 1 -- transform to 0-indexed line number
 
   for _, block in ipairs(codeblocks) do
     if cursor_line >= block.start_line and cursor_line <= block.end_line then return block end

lua/avante/templates/planning.avanterules

@@ -124,11 +124,11 @@ If the file contains code or other data wrapped/escaped in json/xml/quotes or ot
 *SEARCH/REPLACE* blocks will replace *all* matching occurrences.
 Include enough lines to make the SEARCH blocks uniquely match the lines to change.
 
+*DO NOT* include three backticks: {%raw%}```{%endraw%} in your response!
 Keep *SEARCH/REPLACE* blocks concise.
 Break large *SEARCH/REPLACE* blocks into a series of smaller blocks that each change a small portion of the file.
 Include just the changing lines, and a few surrounding lines if needed for uniqueness.
 Do not include long runs of unchanging lines in *SEARCH/REPLACE* blocks.
-*DO NOT* include three backticks: {%raw%}```{%endraw%} in your response!
 {% if use_xml_format -%}
 ONLY change the <code>, DO NOT change the <conext>!
 {% else -%}

lua/avante/utils/init.lua

@@ -446,10 +446,16 @@ end
 
 ---@param code string
 ---@return string
-function M.get_indentation(code) return code:match("^%s*") or "" end
+function M.get_indentation(code)
+  if not code then return "" end
+  return code:match("^%s*") or ""
+end
 
 --- remove indentation from code: spaces or tabs
-function M.remove_indentation(code) return code:gsub("^%s*", "") end
+function M.remove_indentation(code)
+  if not code then return code end
+  return code:gsub("^%s*", "")
+end
 
 function M.relative_path(absolute)
   local relative = fn.fnamemodify(absolute, ":.")