commit a853c647d6def51ee92d2fc8d7c8ede5e96c5a13
Author: Daniel Langbein <daniel@systemli.org>
Date:   Sat Dec 10 16:53:57 2022 +0100

    init

diff --git a/.gitignore b/.gitignore
new file mode 100644
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/.idea/
+/venv/
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..b033626
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+Mastodon.py
\ No newline at end of file
diff --git a/src/mastodon_toot_follower/__init__.py b/src/mastodon_toot_follower/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/mastodon_toot_follower/app.py b/src/mastodon_toot_follower/app.py
new file mode 100644
index 0000000..e1eda55
--- /dev/null
+++ b/src/mastodon_toot_follower/app.py
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+from pathlib import Path
+from mastodon import Mastodon
+
+from mastodon_toot_follower import path_util
+
+
+class App:
+    def __init__(self,
+                 name: str = 'MastodonTootFollower',
+                 url: str = 'https://git.privacy1st.de/langfingaz/MastodonTootFollower',
+                 config_dir: Path = None,
+                 ):
+        if len(name) <= 0:
+            raise ValueError(f'name is too short: {name}')
+        if config_dir is None:
+            config_dir = Path.home().joinpath('.' + name)
+
+        self.name = name
+        self.url = url
+        self.config_dir = config_dir
+        self.mastodon_dict: dict[str, Mastodon] = dict()
+
+        config_dir.mkdir(parents=True, exist_ok=True)
+        self._credential_dir().mkdir(parents=True, exist_ok=True)
+        self._toot_cache_dir().mkdir(parents=True, exist_ok=True)
+
+    def _get_mastodon(self, mastodon_instance: str) -> Mastodon:
+        if mastodon_instance not in self.mastodon_dict:
+            self._create_or_load_credentials(mastodon_instance)
+            # Create Mastdon API wrapper object.
+            self.mastodon_dict[mastodon_instance] = Mastodon(client_id=self._credential_file(mastodon_instance))
+        return self.mastodon_dict[mastodon_instance]
+
+    def _create_or_load_credentials(self, mastodon_instance: str) -> None:
+        cf = self._credential_file(mastodon_instance)
+
+        # Create application credentials only once and save them.
+        if cf.exists():
+            return
+        Mastodon.create_app(
+            client_name=self.name,
+            website=self.url,
+            api_base_url=mastodon_instance,
+            to_file=cf,
+            scopes=['read']
+        )
+
+    def _credential_file(self, mastodon_instance: str) -> Path:
+        return self._credential_dir().joinpath(path_util.escape(mastodon_instance))
+
+    def _credential_dir(self) -> Path:
+        return self.config_dir.joinpath('credentials')
+
+    def _toot_cache_dir(self) -> Path:
+        return self.config_dir.joinpath('toots')
diff --git a/src/mastodon_toot_follower/conversation.py b/src/mastodon_toot_follower/conversation.py
new file mode 100644
index 0000000..9f10abb
--- /dev/null
+++ b/src/mastodon_toot_follower/conversation.py
@@ -0,0 +1,99 @@
+from mastodon_toot_follower import path_util
+import json
+from mastodon_toot_follower.app import App
+
+
+class Conversation:
+    def __init__(self, app: App, mastodon_instance: str, toot_id: str):
+        self.app = app
+        self.mastodon = self.app._get_mastodon(mastodon_instance)
+
+        self.toot_id = toot_id
+        self.toot = self.mastodon.status(id=self.toot_id)
+        self.toot_file = self.app._toot_cache_dir().joinpath(path_util.escape(self.toot['uri']) + '.json')
+
+        self._replies = None
+        self._changed_toots = None
+        self._saved = False
+
+    def get_conversation_length(self) -> int:
+        return len(self.toots())
+
+    def get_changed_toots_and_update(self):
+        """
+        Compares the old and current versions of this conversation.
+        Saves the current version of the conversation afterwards.
+
+        :return: New and changes toots which are part of this conversation.
+        """
+        if self.is_new():
+            self._changed_toots = []
+            self.save()
+            return self._changed_toots
+        else:
+            changed_toots = self.get_changed_toots()
+            if len(changed_toots) > 0:
+                self.save()
+            return changed_toots
+
+    def get_changed_toots(self) -> list:
+        """
+        Compares the old and current versions of this conversation.
+
+        :return: New and changes toots which are part of this conversation.
+        """
+        if self._changed_toots is None:
+            old_toots = self.load()
+            old_toots_dict = {old_toot['id']: old_toot['edited_at']
+                              for old_toot in old_toots}
+            toots = self.toots()
+
+            self._changed_toots = []
+            for toot in toots:
+                toot_id_not_found = object()
+                old_edited_at = old_toots_dict.get(toot['id'], toot_id_not_found)
+                if old_edited_at is toot_id_not_found or toot['edited_at'] != old_edited_at:
+                    # New reply or has been edited.
+                    self._changed_toots.append(toot)
+
+        return self._changed_toots
+
+    def is_new(self):
+        """
+        :return: True if this is a new conversation of which no old version exists.
+        """
+        return not self.toot_file.exists()
+
+    def save(self):
+        """
+        :return: Saves the current version of the conversation. This overwrites the previously saved version.
+        """
+        if self._saved:
+            return
+        self._saved = True
+        toots = [{'id': entry['id'], 'edited_at': entry['edited_at']}
+                 for entry in self.toots()]
+        with self.toot_file.open('w') as f:
+            f.write(json.dumps(toots))
+
+    def load(self) -> list:
+        """
+        :return: Loads an old version of this conversation.
+        """
+        if self._saved:
+            raise ValueError('The old version of this conversation has been overwritten.')
+        return json.loads(self.toot_file.read_text())
+
+    def toots(self) -> list:
+        """
+        :return: List of initial toot and it's replies.
+        """
+        return [self.toot] + self.replies()
+
+    def replies(self) -> list:
+        """
+        :return: List of replies to initial toot.
+        """
+        if self._replies is None:
+            self._replies = self.mastodon.status_context(id=self.toot_id)['descendants']
+        return self._replies
diff --git a/src/mastodon_toot_follower/main.py b/src/mastodon_toot_follower/main.py
new file mode 100644
index 0000000..654b898
--- /dev/null
+++ b/src/mastodon_toot_follower/main.py
@@ -0,0 +1,45 @@
+import re
+import sys
+
+from mastodon_toot_follower.app import App
+from mastodon_toot_follower.conversation import Conversation
+
+
+def main():
+    if len(sys.argv) != 2:
+        usage()
+    toot_url = sys.argv[1]
+
+    #
+    # PARSE TOOT URL
+    #
+
+    # Example: https://mastodon.instance/@user@another.instance/123456
+    pattern = re.compile(r'(^https://[^/]+)/([^/]+)/([0-9]+)$')
+    match = pattern.match(toot_url)
+    if match is None:
+        print(f'Could not parse toot url: {toot_url}', file=sys.stderr)
+        usage()
+    instance_url, username, toot_id = match.group(1), match.group(2), match.group(3)
+
+    #
+    # RUN THE APP
+    #
+
+    app = App()
+    conversation = Conversation(app=app,
+                                mastodon_instance=instance_url,
+                                toot_id=toot_id)
+    print(f'Conversation length: {conversation.get_conversation_length()}')
+    print(f'Updates: {conversation.get_changed_toots_and_update()}')
+
+
+def usage():
+    print(f'\n'
+          f'usage: {sys.argv[0]} MASTODON_TOOT_URL\n'
+          f'example: {sys.argv[0]} https://mastodon.instance/@user@another.instance/123456', file=sys.stderr)
+    exit(1)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/src/mastodon_toot_follower/mastodon_py_library_experiments.py b/src/mastodon_toot_follower/mastodon_py_library_experiments.py
new file mode 100644
index 0000000..12cd6fe
--- /dev/null
+++ b/src/mastodon_toot_follower/mastodon_py_library_experiments.py
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+from pathlib import Path
+
+from mastodon import Mastodon
+
+
+def main():
+    app_name = 'MastodonTootFollower'
+    git_url = 'https://git.privacy1st.de/langfingaz/MastodonTootFollower'
+    app_credentials = Path(app_name + '.secret')
+
+    instance_url = 'https://replace-with-existing-instance'
+
+    # Create application credentials only once.
+    if not app_credentials.exists():
+        client_id, client_secret = Mastodon.create_app(
+            client_name=app_name,
+            website=git_url,
+            api_base_url=instance_url,
+            to_file=app_credentials,
+            scopes=['read']
+        )
+
+    # Create Mastdon API wrapper object.
+    # Optionally, log in.
+    #
+    # Copied from __init__:
+    #         Create a new API wrapper instance based on the given `client_secret` and `client_id` on the
+    #         instance given by `api_base_url`. If you give a `client_id` and it is not a file, you must
+    #         also give a secret. If you specify an `access_token` then you don't need to specify a `client_id`.
+    #         It is allowed to specify neither - in this case, you will be restricted to only using endpoints
+    #         that do not require authentication. If a file is given as `client_id`, client ID, secret and
+    #         base url are read from that file.
+    mastodon = Mastodon(client_id=app_credentials)
+    # mastodon.log_in(
+    #     username='my_login_email@example.com',
+    #     password='incrediblygoodpassword',
+    #     to_file='pytooter_usercred.secret'
+    # )
+
+    test_status_info(mastodon, 'https://replace-with-existing-toot-url')
+
+
+def test_status_info(mastodon: Mastodon, status_url: str, cache_dir: Path = Path('cache')) -> None:
+    # Example: https://mastodon.instance/@user@another.instance/123456
+
+    prefix = 'https://'
+    if not status_url.startswith(prefix):
+        raise ValueError(status_url)
+    status_url = status_url[len(prefix):]
+    status_url_parts = status_url.split('/')
+    if len(status_url_parts) != 3:
+        raise ValueError(status_url)
+
+    instance_url, username, status_id = status_url_parts
+
+    # Returns information about the given status.
+    # - number of replies
+    # result = mastodon.status(id=status_id)
+
+    # Returns the following dictionary:
+    # {
+    #     'ancestors':  # A list of toot dicts
+    #     'descendants':  # A list of toot dicts (including fields `id`, `created_at`, 'edited_at')
+    # }
+    result = mastodon.status_context(id=status_id)
+
+    print(result)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/src/mastodon_toot_follower/path_util.py b/src/mastodon_toot_follower/path_util.py
new file mode 100644
index 0000000..ad5b64a
--- /dev/null
+++ b/src/mastodon_toot_follower/path_util.py
@@ -0,0 +1,2 @@
+def escape(filename: str) -> str:
+    return filename.replace('/', '_')