self.code()

This function pipes a javascript file to a Python implementation of Douglas Crockford’s handy JSMin, a javascript minifier.

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minify() {
  if [ -f $1 ]
  then
    MIN=${1%.[^.]*}.min.js
    cat $1 | python ~/path/to/jsmin.py > ${1%.[^.]*}.min.js
    BEFORE=`wc -c <$1`
    AFTER=`wc -c <$MIN`
    echo "$BEFORE $1"
    echo "$AFTER $MIN ($(echo "scale=2; 100*$AFTER/$BEFORE" | bc)%)"
  else
    echo "$1 not found"
  fi
}

It also prints the minified version’s character count as a percentage of the original’s:

$ minify prototype.js 

  126127 prototype.js
   93689 prototype.min.js (74.28%)

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import os

List all files in a directory recursively, with relative paths:

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def list_dir(dir_name):
    for r, d, f in os.walk(dir_name):
        files = [os.path.join(r, n) for n in f if not n.startswith('.')]
    return files

Create a directory if it doesn’t already exist:

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def make_dir(dir_name):
    if not os.path.isdir(dir_name):
        os.mkdir(dir_name)

Empty an existing directory:

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def empty_dir(dir_name):
    if not os.path.isdir(dir_name):
        os.mkdir(dir_name)
    else:
        [os.remove(f) for f in list_dir(dir_name)]

^a c

Create new window (shell)

^a k

Kill the current window

^a w

List all windows
(the current window is marked with *)

^a 0-9

Go to a window numbered 0-9

^a n

Go to the next window

^a ^a

Toggle between the current and previous window

^a [

Start copy mode

^a ]

Paste copied text

^a ?

Help (display a list of commands)

^a ^\

Quit screen

^a D

Power detach and logout

^a d

Detach but keep shell window open

space or return

End a command

Source: Indiana University UITS

This is just something I find myself having to do a lot, so here’s a convenient little function to reverse sort a Python dictionary by value.

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from operator import itemgetter

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def sort_dict(d, sort_key=1, rev_bool=True):
    return sorted(d.items(), key=itemgetter(sort_key), reverse=rev_bool)