Initial commit

Author: pawamoy

.gitignore

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+.idea/
+Pipfile.lock
+example/
+example2/
+output.md

Pipfile

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+[[source]]
+verify_ssl = true
+name = "pypi"
+url = "https://pypi.python.org/simple"
+
+[packages]
+"jinja2" = "*"
+
+[requires]
+python_version = "3.5"
+
+[dev-packages]
+ipython = "*"

script.py

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+import os
+import sys
+from subprocess import check_output
+
+from jinja2 import Environment, FileSystemLoader
+
+env = Environment(loader=FileSystemLoader('templates'))
+
+
+class GitLog:
+    MARKER = '--PYCHOLOG MARKER--'
+    FORMAT = (
+        '%H%n'  # commit hash
+        '%an%n'  # author name
+        '%ae%n'  # author email
+        '%ad%n'  # author date
+        '%cn%n'  # committer name
+        '%ce%n'  # committer email
+        '%cd%n'  # committer date
+        '%D%n'  # tag
+        '%s%n'  # subject
+        '%b%n' + MARKER  # body
+    )
+
+    COMMAND = ['git', 'log', '--tags', '--date=raw', '--format=' + FORMAT]
+
+    def __init__(self, repository):
+        self.repository = repository
+        self.raw_log = self.get()
+        self.commits = self.parse_commits()
+
+    def get(self):
+        # remove enclosing b-quotes (b'' or b"")
+        return str(check_output(self.COMMAND, cwd=self.repository))[2:-1].replace("\\'", "'")
+
+    def parse_commits(self):
+        lines = self.raw_log.split('\\n')
+        size = len(lines) - 1  # don't count last blank line
+        commits = []
+        pos = 0
+        while pos < size:
+            commit = Commit(
+                commit_hash=lines[pos],
+                author_name=lines[pos+1],
+                author_email=lines[pos+2],
+                author_date=lines[pos+3],
+                committer_name=lines[pos+4],
+                committer_email=lines[pos+5],
+                committer_date=lines[pos+6],
+                tag=lines[pos+7],
+                subject=lines[pos+8],
+                body=[lines[pos+9]]
+            )
+            commits.append(commit)
+            nbl_index = 10
+            while lines[pos+nbl_index] != self.MARKER:
+                commit.body.append(lines[pos+nbl_index])
+                nbl_index += 1
+            pos += nbl_index + 1
+        return commits
+
+
+class Commit:
+    def __init__(self, commit_hash,
+                 author_name=None, author_email=None, author_date=None,
+                 committer_name=None, committer_email=None, committer_date=None,
+                 tag=None, subject=None, body=None):
+        self.commit_hash = commit_hash
+        self.author_name = author_name
+        self.author_email = author_email
+        self.author_date = author_date
+        self.committer_name = committer_name
+        self.committer_email = committer_email
+        self.committer_date = committer_date
+        self.tag = tag
+        self.subject = subject
+        self.body = body or []
+
+
+if __name__ == '__main__':
+    commits = GitLog('example2').commits
+    template = env.get_template('changelog.md')
+    rendered = template.render(commits=commits)
+    with open('output.md', 'w') as stream:
+        stream.write(rendered)
+    for commit in commits:
+        print(commit.subject)
+    sys.exit(0)

templates/changelog.md

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+This is my changelog
+
+{% for commit in commits -%}
+  {% include 'commit.md' with context %}
+{% endfor %}

templates/commit.md

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+commit {{ commit.commit_hash }}
+Author name: {{ commit.author_name }}
+Author email: {{ commit.author_email }}
+Author date: {{ commit.author_date }}
+Committer name: {{ commit.committer_name }}
+Committer email: {{ commit.committer_email }}
+Committer date: {{ commit.committer_date }}
+{% if commit.tag %}Tag: {{ commit.tag }}{% endif %}
+Subject: {{ commit.subject }}
+Body: {% for line in commit.body %}
+{% if line %}{{ line }}{% endif %}
+{% endfor %}