If it won't be simple, it simply won't be. [source code] by Miki Tebeka, CEO, 353Solutions

Monday, January 31, 2011

JSON decorator for CherryPy

#!/usr/bin/env python

from functools import wraps
import json
from cherrypy import response, expose

def jsonify(func):
    '''JSON decorator for CherryPy'''
    @wraps(func)
    def wrapper(*args, **kw):
        value = func(*args, **kw)
        response.headers["Content-Type"] = "application/json"
        return json.dumps(value)

    return wrapper

def example():
    from cherrypy import quickstart
    from datetime import datetime
    class Time:
        @expose
        @jsonify
        def index(self):
            now = datetime.now()
            return {
                "date" : now.strftime("%Y-%m-%d"),
                "time" : now.strftime("%H:%M"),
                "day" : now.strftime("%A"),
            }

    quickstart(Time())

if __name__ == "__main__":
    example()

$curl -i localhost:8080
HTTP/1.1 200 OK
Date: Mon, 31 Jan 2011 03:18:34 GMT
Content-Length: 56
Content-Type: application/json
Server: CherryPy/3.1.2

{"date": "2011-01-30", "day": "Sunday", "time": "19:18"}

Thursday, January 20, 2011

Having hg output svn diffs

In my current workplace we use Subversion as the main VCS. I use Mercurial on top of it to get easy feature branches. My problem was that we use svn patches in our review process, and mercurial (hg diff -r default) gave me different format patches. The solution (as suggested by durin42 on #mercurial) was to use hgsubversion.

After installing hgsubversion using pip (or easy_install), you need to add it to your ~/.hgrc:
    [extensions]
    hgsubversion =

Then you can create patches using "hg diff -svn -r default", I use the following genpatch script for that:
#!/bin/bash
# Generate svn style diff for current hg feature branch

branch=$(hg branch)
if [ -z $branch ]; then
    echo "error: not a mercurial repo" 1>&2
    exit 1
fi

if [ "$branch" == "default" ]; then
    echo "error: in default branch" 1>&2
    exit 1
fi

hg diff --svn -r default > ${branch}.patch

Sunday, January 16, 2011

gcalc - Command line interface to Google calculator

#!/usr/bin/env python
'''Command line interface to Google calculator
    gcalc 100f c -> 37.7777778 degrees Celsius
'''

# Idea taken from http://bit.ly/dVL4H3

import json
from urllib import urlopen
import re

def main(argv=None):
    import sys
    from optparse import OptionParser

    argv = argv or sys.argv

    parser = OptionParser("%prog FROM TO\n\t%prog 100f c")
    opts, args = parser.parse_args(argv[1:])
    if len(args) != 2:
        parser.error("wrong number of arguments") # Will exit

    url = "http://www.google.com/ig/calculator?q=%s=?%s" % tuple(args)
    try:
        # We decode to UTF-8 since Google sometimes return funny stuff
        result = urlopen(url).read().decode("utf-8", "ignore")
        # Convert to valid JSON: {foo: "1"} -> {"foo" : "1"}
        result = re.sub("([a-z]+):", '"\\1" :', result)
        result = json.loads(result)
    except (ValueError, IOError), e:
        raise SystemExit("error: %s" % e)

    if result["error"]:
        raise SystemExit("error: %s" % result["error"])

    print result["rhs"]

if __name__ == "__main__":
    main()

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