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restore cursor to same line of code, not same line of buffer (#989)
authorCharles Reid <53452777+chmreid@users.noreply.github.com>
Sun, 20 Oct 2019 14:00:48 +0000 (07:00 -0700)
committerŁukasz Langa <lukasz@langa.pl>
Sun, 20 Oct 2019 14:00:48 +0000 (16:00 +0200)
plugin/black.vim

index 15a13d1b14f385ac49411eeae9bcf326e9b71c91..29b2992448739aa9fe4d2ed2e6960244ee69882f 100644 (file)
@@ -110,7 +110,29 @@ def Black():
     string_normalization=not bool(int(vim.eval("g:black_skip_string_normalization"))),
     is_pyi=vim.current.buffer.name.endswith('.pyi'),
   )
     string_normalization=not bool(int(vim.eval("g:black_skip_string_normalization"))),
     is_pyi=vim.current.buffer.name.endswith('.pyi'),
   )
-  buffer_str = '\n'.join(vim.current.buffer) + '\n'
+  (cursor_line, cursor_column) = vim.current.window.cursor
+  cb = vim.current.buffer[:]
+  cb_bc = cb[0:cursor_line]
+  # Format all code before the cursor.
+  # Detect unclosed blocks, close them with pass.
+  last_line = cb_bc[-1]
+  if last_line.rstrip().endswith(":"):
+      cb_bc[-1] = last_line + " pass"
+  # Determine old:new cursor location mapping
+  buffer_str_before = '\n'.join(cb_bc)+'\n'
+  try:
+    new_buffer_str_before = black.format_file_contents(buffer_str_before, fast=fast, mode=mode)
+    new_cb = new_buffer_str_before.split('\n')[:-1]
+    new_cursor_line = len(new_cb)
+    new_cursor = (new_cursor_line, cursor_column)
+  except black.NothingChanged:
+    new_cursor_line = cursor_line
+    new_cursor = (new_cursor_line, cursor_column)
+  except Exception as exc:
+    print(exc)
+  # Now we know where the cursor should be
+  # when we format the entire buffer. Do it:
+  buffer_str = '\n'.join(cb) + '\n'
   try:
     new_buffer_str = black.format_file_contents(buffer_str, fast=fast, mode=mode)
   except black.NothingChanged:
   try:
     new_buffer_str = black.format_file_contents(buffer_str, fast=fast, mode=mode)
   except black.NothingChanged:
@@ -118,10 +140,12 @@ def Black():
   except Exception as exc:
     print(exc)
   else:
   except Exception as exc:
     print(exc)
   else:
-    cursor = vim.current.window.cursor
-    vim.current.buffer[:] = new_buffer_str.split('\n')[:-1]
+    # Replace the buffer
+    new_cb = new_buffer_str.split('\n')[:-1]
+    vim.current.buffer[:] = new_cb
+    # Restore the cursor to its rightful place
     try:
     try:
-      vim.current.window.cursor = cursor
+      vim.current.window.cursor = new_cursor
     except vim.error:
       vim.current.window.cursor = (len(vim.current.buffer), 0)
     print(f'Reformatted in {time.time() - start:.4f}s.')
     except vim.error:
       vim.current.window.cursor = (len(vim.current.buffer), 0)
     print(f'Reformatted in {time.time() - start:.4f}s.')