Add generate_authors.py and AUTHORS

AUTHORS

@@ -0,0 +1,6 @@
+Ram Rachum
+Oleg Butuzov
+Edward Betts
+wilfredinni
+Peter Bittner
+Alireza Ayinmehr

misc/generate_authors.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+# Copyright 2019 Ram Rachum.
+# This program is distributed under the MIT license.
+
+
+"""
+Generate an AUTHORS file for your Git repo.
+
+This will list the authors by chronological order, from their first
+contribution.
+
+You probably want to run it this way:
+
+    ./generate_authors > AUTHORS
+
+"""
+
+
+import time
+
+import subprocess
+
+
+def drop_recurrences(iterable):
+    s = set()
+    for item in iterable:
+        if item not in s:
+            s.add(item)
+            yield item
+
+
+def iterate_authors_by_chronological_order():
+    log_call = subprocess.run(
+        (
+            'git', 'log', 'master', '--encoding=utf-8', '--full-history',
+            '--reverse', '--format=format:%at;%an;%ae'
+        ),
+        stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+    )
+    log_lines = log_call.stdout.decode('utf-8').split('\n')
+
+    return drop_recurrences(
+        (line.strip().split(";")[1] for line in log_lines)
+    )
+
+
+def print_authors():
+    for author in iterate_authors_by_chronological_order():
+        print(author)
+
+if __name__ ==  '__main__':
+    print_authors()