Basic clang-format vim-integration.

File contains installation and usage instructions.

llvm-svn: 169421

clang-tools-extra/clang-format/clang-format.py

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+# This file is a minimal clang-format vim-integration. To install:
+# - Change 'binary' if clang-format is not on the path (see below).
+# - Add to your .vimrc:
+#
+#   map <C-I> :pyf <path-to-this-file>/clang-format.py<CR>
+#   imap <C-I> <ESC>:pyf <path-to-this-file>/clang-format.py<CR>i
+#
+# The first line enables clang-format for NORMAL and VISUAL mode, the second
+# line adds support for INSERT mode. Change "C-I" to another binding if you
+# need clang-format on a different key (C-I stands for Ctrl+i).
+#
+# With this integration you can press the bound key and clang-format will
+# format the current line in NORMAL and INSERT mode or the selected region in
+# VISUAL mode. The line or region is extended to the next bigger syntactic
+# entity.
+#
+# It operates on the current, potentially unsaved buffer and does not create
+# or save any files. To revert a formatting, just undo.
+
+import vim
+import subprocess
+
+# Change this to the full path if clang-format is not on the path.
+binary = 'clang-format'
+
+# Get the current text.
+buf = vim.current.buffer
+text = "\n".join(buf)
+
+# Determine range to format.
+offset = int(vim.eval('line2byte(' +
+                      str(vim.current.range.start + 1) + ')')) - 1
+length = int(vim.eval('line2byte(' +
+                      str(vim.current.range.end + 2) + ')')) - offset - 2
+
+# Call formatter.
+p = subprocess.Popen([binary, '-offset', str(offset), '-length', str(length)],
+                     stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+                     stdin=subprocess.PIPE)
+stdout, stderr = p.communicate(input=text)
+
+# If successful, replace buffer contents.
+if stderr:
+  print stderr
+else:
+  if stdout != text:
+    lines = stdout.split('\n')
+    for i in range(min(len(buf), len(lines))):
+      buf[i] = lines[i]
+    for line in lines[len(buf):]:
+      buf.append(line)
+    del buf[len(lines):]