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#!/usr/bin/env python

import subprocess, os, sys, hashlib, urllib

GRAVATAR_URL = "http://www.gravatar.com/avatar/%(id)s?d=404"

if len(sys.argv) != 2 :
    print("Usage: " + sys.argv[0] + " <output-dir>")
    sys.exit(-1)

output_dir = sys.argv[1]

# Retrieve the list of authors
authors = {}
p = subprocess.Popen("git log --pretty=format:'%ae|%an'", shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=(os.name != "nt"))
for line in p.stdout.readlines() :
    author_components = line.rstrip().split("|")
    authors[author_components[0]] = author_components[1]
p.stdin.close()
if p.wait() != 0 :
    print("Error")
    sys.exit(-1)

# Get & save the avatars
if not os.path.isdir(output_dir) :
    os.makedirs(output_dir)
for email, name in authors.items() :
    print("Processing avatar for " + name + " <" + email + ">")
    filename = os.path.join(output_dir, name + ".png")
    if os.path.isfile(filename) :
        print("-> Already there. Skipping.")
        continue

    m = hashlib.md5()
    m.update(email)
    url = GRAVATAR_URL % {"id" : m.hexdigest()}
    print("- Downloading " + url)
    f = urllib.urlopen(url)
    input = None
    if f.getcode() == 200 :
        input = f.read()
    f.close()
    if input :
        print("- Saving file " + filename)
        f = open(filename, "w")
        f.write(input)
        f.close()
    else :
        print("- No Gravatar found")