Added Argparse and PEP8ified the code

README.md

@@ -2,16 +2,32 @@
 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.,
+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 `days` number of days before today to generate commits for. E.g.,
 
-	python greenhat.py <n>
+	python greenhat.py --days <DAYS>
 
 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>
+	python greenhat.py --days <DAYS> --date <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).
+`days` 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).
 
+Usage
+=====
+```sh
+
+usage: greenhat.py [-h] [-dy DAYS] [-da DATE]
+
+Quick hack for making real work happen.
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -dy DAYS, --days DAYS
+                        Number of days before to generate commits
+  -da DATE, --date DATE
+                        Specify a date(Default: Today)
+
+```
 #### An Example
 
 The following calendar is the result of running `python greenhat.py 365`:

greenhat.py

@@ -1,38 +1,49 @@
 # Copyright (c) 2015 Angus H. (4148)
 # Distributed under the GNU General Public License v3.0 (GPLv3).
+'''define utf-8 encoding'''
 
-from datetime import date, timedelta
+from datetime import date, timedelta, datetime
 from random import randint
 from time import sleep
 import sys
 import subprocess
-import os
+from argparse import ArgumentParser
+
+
 
-# 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
+    '''# returns a date string for the date that is N days before 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)
+def main():
+    '''Main function'''
+    parser = ArgumentParser(description="Quick hack for making real work happen.")
+    parser.add_argument("-dy", "--days", help="Number of days before to generate commits", type=int)
+    parser.add_argument("-da", "--date", help="Specify a date(Default: Today)", type=str)
+
+    if len(sys.argv) == 1:
+        parser.print_help()
+        return
+
+    args = parser.parse_args()
+
+    n = args.days
+    if args.date:
+        startdate = datetime.strptime(str(args.date), "%Y-%m-%d").date()
+    else:
+        startdate = date.today()
+    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:])
+    main()