As used for building sheet [pybind11 commit overview (git log -p -m 2020-05-22 14:19 PDT)].

Author: rwgk

mine_git_log.py

@@ -0,0 +1,95 @@
+"""Produces CSV lists of Count, Author for 1. merge, 2. regular commits.
+
+Usage:
+  cd <gitrepo>
+  git log -p -m > git_log_p_m_output.txt
+  python3 mine_git_log.py git_log_p_m_output.txt
+"""
+
+import collections
+import sys
+
+
+class CommitInfo:
+
+  __slots__ = (
+      'commit', 'merge', 'author', 'date',
+      'author_name')
+
+  def __init__(self):
+    for slot in self.__slots__:
+      setattr(self, slot, None)
+
+
+def set_derived_info_in_place(all_commit_info):
+  # pylint: disable=missing-docstring
+  email_list_by_name = collections.defaultdict(set)
+  author_name_buffer = []
+  for commit_info in all_commit_info:
+    author_line = commit_info.author
+    flds = author_line.split('<', 1)
+    assert len(flds) == 2, author_line
+    assert flds[1].endswith('>'), author_line
+    author_name = flds[0].strip()
+    email = flds[1][:-1]
+    email_list_by_name[author_name].add(email)
+    author_name_buffer.append(author_name)
+  for commit_info, author_name in zip(all_commit_info, author_name_buffer):
+    commit_info.author_name = author_name
+  return email_list_by_name
+
+
+def sorted_by_counts(key_count_items, counts_top_down=True):
+  csign = -1 if counts_top_down else 1
+  return tuple(
+      [(csign * scount, key) for scount, key in sorted(
+          [(csign * count, key) for key, count in key_count_items])])
+
+
+def author_counts(all_commit_info, merge_commit_selector):
+  assert isinstance(merge_commit_selector, bool)
+  counts_by_author = collections.defaultdict(int)
+  for commit_info in all_commit_info:
+    if bool(commit_info.merge) is merge_commit_selector:
+      counts_by_author[commit_info.author_name] += 1
+  return sorted_by_counts(counts_by_author.items())
+
+
+def run(args):
+  # pylint: disable=missing-docstring
+  assert len(args) == 1, 'git log -p -m output'
+  all_commit_info = []
+  full_log_lines = open(args[0]).read().splitlines()
+  line_iter = iter(full_log_lines)
+  open_block = False
+  for line in line_iter:
+    if line.startswith('commit '):
+      commit_info = CommitInfo()
+      assert not open_block
+      open_block = True
+      for block_line in line_iter:
+        if not block_line.strip():
+          break
+        flds = block_line.split(' ', 1)
+        assert len(flds) == 2, block_line
+        key = flds[0].lower()
+        if key.endswith(':'):
+          key = key[:-1]
+        if not hasattr(commit_info, key):
+          raise RuntimeError('Unexpected line after "commit": %s' % block_line)
+        setattr(commit_info, key, flds[1])
+      open_block = False
+      all_commit_info.append(commit_info)
+  assert not open_block
+  set_derived_info_in_place(all_commit_info)
+  for commit_kind in ['Merge ', '']:
+    counts_by_author_name = author_counts(
+        all_commit_info, merge_commit_selector=(commit_kind == 'Merge '))
+    print('"Count","%sAuthor"' % commit_kind)
+    for count, author_name in counts_by_author_name:
+      print('%s,%s' % (count, author_name))
+    print(',')
+
+
+if __name__ == '__main__':
+  run(args=sys.argv[1:])