Using tags file with emacs

M-.       goes to the symbol definition
M-0 M-.   goes to the next matching definition
M-*       return to your starting point

M-x tags-search <type your regexp>       initiate a search
M-,                                      go to the next match

Making my etags file

Recursively find .py files and pipe them into etags.

find . -regex '.*py' -print | etags -

Emacs Kill Commands

Emacs kill commands. Italic text in parenthesis is the elisp command.

• C-w : Kill region (kill-region).
• M-w : Save region as last killed text without actually killing it (kill-ring-save). Some programs call this “copying.”
• M-d : Kill word (kill-word). 
• M-<BS>:kill word backwards (backward-kill-word). 
• C-x <BS> : Kill back to beginning of sentence (backward-kill-sentence).
• M-k : Kill to end of sentence (kill-sentence).  
• M-k : Kill to end of sentence (kill-sentence).    
• C-M-k : Kill the following balanced expression (kill-sexp).  
• M-z char : Kill through the next occurrence of char (zap-to-char).
• M-\ : Kill whitespace forward.
  

Emacs Snippets

m-x occur << wow! awesome

Python Snippets

With a regular expression,

import re
newstring = re.sub(r"\b(\w)(?![2'])", r'\1x', oldstring)

should be fine. If you're allergic to res,

news = ' '.join(x + 'x' if len(x)==1 else x for x in olds.split())

is a concise way of expressing a similar transformation (if length-one is really the only thing you need to check before appending 'x' to an item).

Emacs - Marking

set mark here                        C-@ or C-SPC
exchange point and mark              C-x C-x
set mark arg words away              M-@
mark paragraph                       M-h
mark page                            C-x C-p
mark sexp                            C-M-@
mark function                        C-M-h
mark entire buffer                   C-x h

Emacs - navigation

• C-f Move forward a character
• C-b Move backward a character
• M-f Move forward a word
• M-b Move backward a word
• C-n Move to next line
• C-p Move to previous line
• C-a Move to beginning of line
• C-e Move to end of line
• M-a Move back to beginning of sentence
• M-e Move forward to end of sentence
• C-v move forward one screen
• M-v move backward one screen
• M-<> go to start/end of file
• C-M-a: Go to the beginning of the current function or class - This doesn't always work for me
• C-M-e: Go to the end of the current function or class
• C-c C-n: Jump to the next statement.
• C-c C-u: Go up one block
• C-l : Centre screen on cursor.