emrange.py

#!/usr/bin/env python
# _*_ coding: utf-8 _*_
#
# Usage:    emrange int:start int:stop
# Examples: emrange      ; Display the total number of articles
#           emrange -5   ; Display the last five articles
#           emrange 0 5  ; Display the first five articles
#
import sys
from emissary.models import Article

def emrange(x, y=None):
    if y:
        articles = Article.query.all()[x:y]
    else:
        articles = Article.query.all()[x:]
    articles.reverse()
    for a in articles:
        print a.uid, a.title

if __name__ == "__main__":
    if   len(sys.argv) == 1:
        print len(Article.query.all())
    elif len(sys.argv) == 2:
        emrange(int(sys.argv[1]))
    elif len(sys.argv) == 3:
        emrange(int(sys.argv[1]), int(sys.argv[2]))