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README.md

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+# greenhat <img src="https://github.com/4148/greenhat/blob/master/greenhat.png" alt="greenhat image" width="10%" height="10%"/>
+greenhat is a quick hack for decorating your GitHub contribution calendar with commits for the past `n` days. It uses the `GIT_AUTHOR_DATE` and `GIT_COMMITTER_DATE` environmental variables to make commits appear in the past. Be warned that greenhat will clobber your repository's commit history.
+
+### How to Use
+Place `greenhat.py` in your Git repository. Make sure your [remote repository URL is set](https://help.github.com/articles/adding-a-remote/), and that you have a [public SSH key set up](https://help.github.com/articles/generating-ssh-keys/). Then run the script with the python interpreter, with an integer specifying `n` number of days before today to generate commits for. E.g.,
+
+	python greenhat.py <n>
+
+It might take a while to generate all the commits. If greenhat stops before it finishes, you can resume where you last left off by specifying a date before today when you want it to resume, like so:
+
+	python greenhat.py <n> <date>
+
+`n` is the remaining days you want to generate commits for, and `date` is a date string in the form `yyyy-mm-dd`  (e.g., 2013-04-05).
+
+#### An Example
+
+The following calendar is the result of running `python greenhat.py 365`:
+
+<img src="https://github.com/4148/greenhat/blob/master/example.png" alt="example image"/>
+
+The run took a total of eight hours. Beautiful, isn't it?
+
+Enjoy your decorated calendar!
+
+### License
+greenhat is distributed under the GNU General Public License v3.0 (GPLv3).

greenhat.py

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+# Copyright (c) 2015 Angus H. (4148)
+# Distributed under the GNU General Public License v3.0 (GPLv3).
+
+from datetime import date, timedelta
+from random import randint
+from time import sleep
+import sys
+import subprocess
+import os
+
+# returns a date string for the date that is N days before STARTDATE
+def get_date_string(n, startdate):
+	d = startdate - timedelta(days=n)
+	rtn = d.strftime("%a %b %d %X %Y %z -0400")
+	return rtn
+
+# main app
+def main(argv):
+	if len(argv) < 1 or len(argv) > 2:
+		print "Error: Bad input."
+		sys.exit(1)
+	n = int(argv[0])
+	if len(argv) == 1:
+		startdate = date.today()
+	if len(argv) == 2:
+		startdate = date(int(argv[1][0:4]), int(argv[1][5:7]), int(argv[1][8:10]))
+	i = 0
+	while i <= n:
+		curdate = get_date_string(i, startdate)
+		num_commits = randint(1, 10)
+		for commit in range(0, num_commits):
+			subprocess.call("echo '" + curdate + str(randint(0, 1000000)) +"' > realwork.txt; git add realwork.txt; GIT_AUTHOR_DATE='" + curdate + "' GIT_COMMITTER_DATE='" + curdate + "' git commit -m 'update'; git push;", shell=True)
+			sleep(.5)
+		i += 1
+	subprocess.call("git rm realwork.txt; git commit -m 'delete'; git push;", shell=True)
+
+if __name__ == "__main__":
+	main(sys.argv[1:])

realwork.txt

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+Fri Jan 15 00:00:00 2016  -040097142