Emacs pylint+flymake

pylint是python上面的lint, lint是古早用於C語言語法檢測的 工具, lint支援emacs..不僅如此lint支援emacs的flymake-mode.

flymake-mode是emacs上面相當強大的語法檢察工具, 他透過外部 程式進行檢查,然後依照檢查結果反應到編輯的buffer.

安裝

安裝pylint還挺煩的,照步驟慢慢來吧..

1. Download pylint.

   http://www.logilab.org/857

2. Download logilab-astng

   http://www.logilab.org/projects/astng

3. Download logilab-common

   http://www.logilab.org/projects/common

4. Download optik

   http://optik.sourceforge.net/

5. 將每個tarbal解壓縮,並進入解壓縮目錄執行:

   python setup.py install
   

Note

如果不放心可以到各package的/test目錄下跑測試

6. 建立一個python script 'epylint' (注意!!沒有副檔名py喔)

#!/usr/bin/env python

import re
import sys

from subprocess import *

p = Popen("pylint -f parseable -r n --disable-msg-cat=C,R %s" %
        sys.argv[1], shell = True, stdout = PIPE).stdout

for line in p.readlines():
  match = re.search("\\[([WE])(, (.+?))?\\]", line)
  if match:
      kind = match.group(1)
      func = match.group(3)

      if kind == "W":
         msg = "Warning"
      else:
         msg = "Error"

      if func:
          line = re.sub("\\[([WE])(, (.+?))?\\]",
                        "%s (%s):" % (msg, func), line)
      else:
          line = re.sub("\\[([WE])?\\]", "%s:" % msg, line)
  print line,

p.close()

7. 將 'epylint' 丟進環境變數path的目錄中好讓flymake-mode可以收尋到.
8. .emacs增加

(when (load "flymake" t)
(defun flymake-pylint-init ()
(let* ((temp-file (flymake-init-create-temp-buffer-copy
                 'flymake-create-temp-inplace))
     (local-file (file-relative-name
                  temp-file
                  (file-name-directory buffer-file-name))))
(list "epylint" (list local-file))))

(add-to-list 'flymake-allowed-file-name-masks
         '("\\.py\\'" flymake-pylint-init)))

** 額外的keybind/和進入python mode 自動啟動參考

(add-hook 'python-mode-hook
     (lambda ()
          (flymake-mode)
          (local-set-key (kbd "\C-c e")
                      'flymake-display-err-menu-for-current-line)
          (local-set-key (kbd "\C-c `") 'flymake-goto-next-error)))

執行

進入python-mode 執行指令(假如你沒有設定自動啟動):

M-x flymake-mode

你會看到python script有藍色的代表警告,紅色代表錯誤.

想知道錯誤原因可以使用function:

M-x flymake-display-err-menu-for-current-line