From 3fe23fdc3825544881e4acc6fad0340f8cf460df Mon Sep 17 00:00:00 2001
From: Piotr Gaczkowski <DoomHammerNG@gmail.com>
Date: Wed, 1 Apr 2026 11:36:01 +0200
Subject: [PATCH 1/3] feat: Add initial Mobilizon => Discord sync

---
 .envrc                                        |   6 +
 .gitignore                                    |   3 +
 .pre-commit-config.yaml                       |   2 +-
 README.md                                     |   2 +-
 devenv.nix                                    |  23 ++
 kronos/main.py                                |  11 -
 pyproject.toml                                |  97 ++++---
 shell.nix                                     |   8 +
 {kronos => src/kronos}/__init__.py            |   0
 src/kronos/discordbot.py                      |  86 ++++++
 src/kronos/main.py                            | 253 ++++++++++++++++++
 src/kronos/templates/newsletter_template.html | 103 +++++++
 12 files changed, 545 insertions(+), 49 deletions(-)
 delete mode 100755 kronos/main.py
 create mode 100644 shell.nix
 rename {kronos => src/kronos}/__init__.py (100%)
 create mode 100644 src/kronos/discordbot.py
 create mode 100755 src/kronos/main.py
 create mode 100644 src/kronos/templates/newsletter_template.html

diff --git a/.envrc b/.envrc
index cc5c18b..0d4fe40 100644
--- a/.envrc
+++ b/.envrc
@@ -1,5 +1,11 @@
 #!/usr/bin/env bash
 
+if ! has nix_direnv_version || ! nix_direnv_version 3.0.5; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.5/direnvrc" "sha256-RuwIS+QKFj/T9M2TFXScjBsLR6V3A17YVoEW/Q6AZ1w="
+fi
+watch_file nix/*.nix
+use nix
+
 export DIRENV_WARN_TIMEOUT=20s
 
 eval "$(devenv direnvrc)"
diff --git a/.gitignore b/.gitignore
index ba0403c..d29838a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,6 @@ devenv.lock
 uv.lock
 __pycache__/
 *.egg-info/
+.env*
+*.pickle
+src/kronos/*events*.html
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e552a88..982fb0b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -25,7 +25,7 @@ repos:
       - id: ruff-format
         name: Ruff format
         description: Format.
-        entry: ruff format --check --config pyproject.toml
+        entry: ruff format --config pyproject.toml
         language: system
         types: [python]
 
diff --git a/README.md b/README.md
index 3dcafbc..5c01ed4 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ pre-commit install
 - Install as editable package.
 
 ```bash
-pip install -e .
+uv pip install -e .
 ```
 
 ## Run
diff --git a/devenv.nix b/devenv.nix
index a3ed509..8d8e23d 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -1,3 +1,4 @@
+{ pkgs, ... }:
 {
   name = "kronos";
 
@@ -11,4 +12,26 @@
       sync.allExtras = true;
     };
   };
+
+  packages = [
+    pkgs.uv
+  ];
+
+  enterShell = ''
+    echo
+    echo "🪝 Installing pre-commit"
+    echo
+    pre-commit install
+
+    echo
+    echo "✨ Installing kronos"
+    echo
+    uv pip install -e .
+
+    echo
+    echo "🙌 Welcome to kronos' devenv!"
+    echo 'To run kronos, type `kronos`'
+    echo
+    echo
+  '';
 }
diff --git a/kronos/main.py b/kronos/main.py
deleted file mode 100755
index 8aae611..0000000
--- a/kronos/main.py
+++ /dev/null
@@ -1,11 +0,0 @@
-from argparse import ArgumentParser
-
-
-def _main():
-    parser = ArgumentParser(prog="kronos", description="Share events between services.")
-    parser.add_argument("--name")
-    _args = parser.parse_args()
-
-
-if __name__ == "__main__":
-    _main()
diff --git a/pyproject.toml b/pyproject.toml
index c55d976..185fa2f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,11 +4,36 @@ version = "0.1.0"
 description = "Share events between services."
 authors = [{ name = "Hackerspace Trójmiasto" }]
 readme = "README.md"
-license = { file = "LICENSE" }
+license-files = ["LICENSE"]
 
 requires-python = ">=3.13"
 
-dependencies = []
+dependencies = [
+  "beautifulsoup4==4.13.4",
+  "brevo-python==1.1.2",
+  "bs4==0.0.2",
+  "cachetools==6.1.0",
+  "certifi==2025.4.26",
+  "charset-normalizer==3.4.2",
+  "cssselect==1.3.0",
+  "cssutils==2.11.1",
+  "discord.py==2.7.1",
+  "html5lib==1.1",
+  "idna==3.10",
+  "Jinja2==3.1.6",
+  "lxml==6.0.0",
+  "MarkupSafe==3.0.2",
+  "more-itertools==10.7.0",
+  "premailer==3.10.0",
+  "python-dateutil==2.9.0.post0",
+  "python-dotenv==1.1.1",
+  "requests==2.32.4",
+  "six==1.17.0",
+  "soupsieve==2.7",
+  "typing_extensions==4.14.0",
+  "urllib3==2.5.0",
+  "webencodings==0.5.1",
+]
 
 [dependency-groups]
 dev = ["pre-commit", "pre-commit-hooks", "pytest", "ruff"]
@@ -18,47 +43,47 @@ kronos = "kronos.main:_main"
 
 [tool.ruff]
 exclude = [
-    ".bzr",
-    ".direnv",
-    ".eggs",
-    ".git",
-    ".git-rewrite",
-    ".hg",
-    ".ipynb_checkpoints",
-    ".mypy_cache",
-    ".nox",
-    ".pants.d",
-    ".pyenv",
-    ".pytest_cache",
-    ".pytype",
-    ".ruff_cache",
-    ".svn",
-    ".tox",
-    ".venv",
-    ".vscode",
-    "__pypackages__",
-    "_build",
-    "buck-out",
-    "build",
-    "dist",
-    "node_modules",
-    "site-packages",
-    "venv",
+  ".bzr",
+  ".direnv",
+  ".eggs",
+  ".git",
+  ".git-rewrite",
+  ".hg",
+  ".ipynb_checkpoints",
+  ".mypy_cache",
+  ".nox",
+  ".pants.d",
+  ".pyenv",
+  ".pytest_cache",
+  ".pytype",
+  ".ruff_cache",
+  ".svn",
+  ".tox",
+  ".venv",
+  ".vscode",
+  "__pypackages__",
+  "_build",
+  "buck-out",
+  "build",
+  "dist",
+  "node_modules",
+  "site-packages",
+  "venv",
 ]
 
 line-length = 100
-indent-width = 4
+indent-width = 2
 target-version = "py313"
 
 [tool.ruff.lint]
 select = [
-    # pycodestyle
-    "E",
-    "W",
-    # pyflakes
-    "F",
-    # pylint
-    "PL",
+  # pycodestyle
+  "E",
+  "W",
+  # pyflakes
+  "F",
+  # pylint
+  "PL",
 ]
 ignore = []
 fixable = ["ALL"]
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..2f26af8
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,8 @@
+{
+  pkgs ? import <nixpkgs> { },
+}:
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    devenv
+  ];
+}
diff --git a/kronos/__init__.py b/src/kronos/__init__.py
similarity index 100%
rename from kronos/__init__.py
rename to src/kronos/__init__.py
diff --git a/src/kronos/discordbot.py b/src/kronos/discordbot.py
new file mode 100644
index 0000000..71ff78e
--- /dev/null
+++ b/src/kronos/discordbot.py
@@ -0,0 +1,86 @@
+import pickle
+import os.path
+import urllib.request
+
+import discord
+
+
+class KronosBot(discord.Client):
+  def attach_events(self, events):
+    print(f"Adding {len(events)} events")
+    self.events = events
+
+  async def on_ready(self):
+    event_mapping_file = "event_mapping.pickle"
+    event_mapping = dict()
+
+    try:
+      if os.path.isfile(event_mapping_file):
+        with open(event_mapping_file, "rb") as f:
+          event_mapping = pickle.load(f)
+    except Exception:
+      print("There are problems opening the pickle jar")
+
+    try:
+      print(f"Logged on as {self.user}!")
+      guilds_total = len(self.guilds)
+      print(f"I work for {guilds_total} guilds")
+      guilds_processed = 0
+      for guild in self.guilds:
+        guild_id = str(guild)
+        print(f"Processing {guild.name} as {guild.me.name}")
+        guilds_processed += 1
+        for event in self.events:
+          description = event["link"] + "\n\n" + event["description"]
+
+          picture_url = "https://hs3.pl/images/zasoby/null.jpg"
+          if event["picture_url"] is not None:
+            picture_url = event["picture_url"]
+          pic = urllib.request.urlopen(picture_url).read()
+
+          print(f"Processing event {event}")
+          if event["link"] in event_mapping and guild_id in event_mapping[event["link"]]:
+            print("Updating the event, this one already processed")
+            discord_event = guild.get_scheduled_event(event_mapping[event["link"]][guild_id])
+            if discord_event is not None:
+              await discord_event.edit(
+                name=event["title"],
+                description=description,
+                start_time=event["start_time"],
+                end_time=event["end_time"],
+                location=event["location"],
+                image=pic,
+              )
+          else:
+            discord_event = await guild.create_scheduled_event(
+              name=event["title"],
+              description=description,
+              start_time=event["start_time"],
+              end_time=event["end_time"],
+              location=event["location"],
+              image=pic,
+              entity_type=discord.EntityType.external,
+              privacy_level=discord.PrivacyLevel.guild_only,
+            )
+            if event["link"] not in event_mapping:
+              event_mapping[event["link"]] = dict()
+            event_mapping[event["link"]][guild_id] = discord_event.id
+            print(f"Mobilizon event {event['link']} mapped to Discord event {discord_event.id}")
+
+      print(f"Dumping event mapping to a pickle: {event_mapping}")
+      with open(event_mapping_file, "wb") as f:
+        pickle.dump(event_mapping, f)
+    except Exception:
+      print("There are problems processing the events, mate")
+
+    print("So long, and thanks for all the fish!")
+    await self.close()
+
+  async def on_message(self, message):
+    print(f"Message from {message.author}: {message.content}")
+
+
+intents = discord.Intents.default()
+intents.message_content = False
+
+client = KronosBot(intents=intents)
diff --git a/src/kronos/main.py b/src/kronos/main.py
new file mode 100755
index 0000000..c747734
--- /dev/null
+++ b/src/kronos/main.py
@@ -0,0 +1,253 @@
+import datetime
+import os
+import sys
+from zoneinfo import ZoneInfo
+from argparse import ArgumentParser
+
+import requests
+from bs4 import BeautifulSoup
+from dotenv import load_dotenv
+from jinja2 import Environment, FileSystemLoader, select_autoescape
+from premailer import transform
+
+from .discordbot import KronosBot, intents
+
+
+MOBILIZON_API_URL = "https://events.hs3.pl/api"
+QUERY_LIMIT = 100
+TIME_WINDOW_DAYS = 365
+TRUNCATE_AFTER_CHARACTERS = 300
+TEMPLATE_FILENAME = "templates/newsletter_template.html"
+OUTPUT_FILENAME = "newsletter_events.html"
+
+
+def sanitize_html(raw_html: str) -> str:
+  wrapper = f"<div>{raw_html}</div>"
+  soup = BeautifulSoup(wrapper, "html5lib")
+  div = soup.find("div")
+  cleaned = "".join(str(child) for child in div.contents)
+  return cleaned
+
+
+def get_time_window(days: int = 365):
+  now_utc = datetime.datetime.now(datetime.timezone.utc)
+  ends_utc = now_utc + datetime.timedelta(days=days)
+
+  begins_iso = now_utc.replace(microsecond=0).isoformat().replace("+00:00", "Z")
+  ends_iso = ends_utc.replace(microsecond=0).isoformat().replace("+00:00", "Z")
+  return begins_iso, ends_iso
+
+
+def build_graphql_query():
+  return """
+    query SearchEventsInWindow($beginsOn: DateTime, $endsOn: DateTime, $limit: Int) {
+      searchEvents(beginsOn: $beginsOn, endsOn: $endsOn, limit: $limit) {
+        total
+        elements {
+          __typename
+          ... on Event {
+            id
+            title
+            description
+            beginsOn
+            picture {
+              url
+            }
+            url
+            physicalAddress {
+              description
+              locality
+            }
+          }
+        }
+      }
+    }
+    """
+
+
+def fetch_events(begins_on: str, ends_on: str, limit: int = QUERY_LIMIT):
+  query = build_graphql_query()
+  variables = {"beginsOn": begins_on, "endsOn": ends_on, "limit": limit}
+  payload = {"query": query, "variables": variables}
+  headers = {"Content-Type": "application/json"}
+
+  resp = requests.post(MOBILIZON_API_URL, json=payload, headers=headers)
+  resp.raise_for_status()
+  data = resp.json()
+  if "errors" in data:
+    raise RuntimeError(f"GraphQL error: {data['errors']}")
+
+  events = []
+  for elem in data["data"]["searchEvents"]["elements"]:
+    if elem.get("__typename") == "Event":
+      begins_iso = elem.get("beginsOn")
+      if begins_iso:
+        dt = datetime.datetime.fromisoformat(begins_iso.replace("Z", "+00:00"))
+        dt_begins = datetime.datetime.fromisoformat(begins_on.replace("Z", "+00:00"))
+        dt_ends = datetime.datetime.fromisoformat(ends_on.replace("Z", "+00:00"))
+        if dt_begins <= dt < dt_ends:
+          events.append(elem)
+  return events
+
+
+def prepare_events_for_template(raw_events: list) -> list:
+  jours_semaine = [
+    "poniedziałek",
+    "wtorek",
+    "środa",
+    "czwartek",
+    "piątek",
+    "sobota",
+    "niedziela",
+  ]
+  mois_annee = [
+    "",
+    "stycznia",
+    "lutego",
+    "marca",
+    "kwietnia",
+    "maja",
+    "czerwca",
+    "lipca",
+    "sierpnia",
+    "września",
+    "października",
+    "listopada",
+    "grudnia",
+  ]
+
+  prepared = []
+  for ev in raw_events:
+    title = ev.get("title", "Untitled")
+
+    raw_desc = ev.get("description") or ""
+    cleaned_html = sanitize_html(raw_desc)
+
+    text_only = BeautifulSoup(cleaned_html, "html.parser").get_text()
+    if len(text_only) > TRUNCATE_AFTER_CHARACTERS:
+      truncated = text_only[:300].rstrip() + " …"
+    else:
+      truncated = text_only
+
+    begins_iso = ev.get("beginsOn")
+    picture = ev.get("picture")
+    picture_url = picture.get("url") if picture else None
+    link = ev.get("url") or ""
+
+    if picture_url and "?" in picture_url:
+      picture_url = picture_url.split("?", 1)[0]
+
+    phys = ev.get("physicalAddress")
+    if phys:
+      part1 = phys.get("description") or ""
+      part2 = phys.get("locality") or ""
+      location = ", ".join(x for x in (part1, part2) if x.strip())
+    else:
+      location = ""
+
+    dt_utc = datetime.datetime.fromisoformat(begins_iso.replace("Z", "+00:00"))
+    dt_paris = dt_utc.astimezone(ZoneInfo("Europe/Paris"))
+    jour_nom = jours_semaine[dt_paris.weekday()]
+    jour_num = dt_paris.day
+    mois_nom = mois_annee[dt_paris.month]
+    annee = dt_paris.year
+    heure = dt_paris.hour
+    minute = dt_paris.minute
+    minute_str = f"{minute:02d}"
+    full_date = f"{jour_nom}, {jour_num} {mois_nom} {annee} @ {heure}:{minute_str}"
+
+    prepared.append(
+      {
+        "title": title,
+        "description": truncated,
+        "full_date": full_date,
+        "picture_url": picture_url,
+        "location": location,
+        "link": link,
+        "start_time": dt_utc,
+        "end_time": dt_utc + datetime.timedelta(hours=1),
+      }
+    )
+
+  return prepared
+
+
+def render_newsletter(events: list, template_dir: str, template_name: str) -> str:
+  env = Environment(
+    loader=FileSystemLoader(searchpath=template_dir),
+    autoescape=select_autoescape(["html", "xml"]),
+  )
+  template = env.get_template(template_name)
+
+  now_paris = datetime.datetime.now(ZoneInfo("Europe/Paris")).strftime("%Y-%m-%d %H:%M")
+  return template.render(events=events, date_now=now_paris)
+
+
+def inline_css(input_html_path, output_html_path):
+  with open(input_html_path, "r", encoding="utf-8") as f:
+    html = f.read()
+  inlined_html = transform(html)
+  with open(output_html_path, "w", encoding="utf-8") as f:
+    f.write(inlined_html)
+
+
+def _main():
+  load_dotenv()
+
+  parser = ArgumentParser(prog="kronos", description="Share events between services.")
+  parser.add_argument("--name")
+  _args = parser.parse_args()
+
+  try:
+    begins_on, ends_on = get_time_window(days=TIME_WINDOW_DAYS)
+    print(
+      f"Fetching events between {begins_on} and {ends_on}...",
+      file=sys.stderr,
+    )
+
+    raw_events = list(
+      filter(
+        lambda x: "https://events.hs3.pl/" in x.get("url", ""),
+        fetch_events(begins_on, ends_on),
+      )
+    )
+    if not raw_events:
+      print("No events found in the requested period.", file=sys.stderr)
+      sys.exit(0)
+
+    for ev in raw_events:
+      print(f"{ev.get('title', 'Untitled')} — {ev.get('beginsOn', 'Unknown date')}")
+
+    raw_events.sort(key=lambda ev: ev.get("beginsOn", ""))
+
+    events = prepare_events_for_template(raw_events)
+
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    html_output = render_newsletter(
+      events=events, template_dir=script_dir, template_name=TEMPLATE_FILENAME
+    )
+
+    output_path = os.path.join(script_dir, OUTPUT_FILENAME)
+    with open(output_path, "w", encoding="utf-8") as f:
+      f.write(html_output)
+    print(f"File '{output_path}' generated successfully.", file=sys.stderr)
+
+    inlined_output_path = os.path.join(script_dir, "newsletter_events_inlined.html")
+    inline_css(output_path, inlined_output_path)
+    print(
+      f"File '{inlined_output_path}' (inline CSS) generated.",
+      file=sys.stderr,
+    )
+
+    discord_token = os.getenv("DISCORD_TOKEN")
+    client = KronosBot(intents=intents)
+    client.attach_events(events)
+    client.run(discord_token)
+
+  except Exception as exc:
+    print(f"Error: {exc}", file=sys.stderr)
+    sys.exit(1)
+
+
+if __name__ == "__main__":
+  _main()
diff --git a/src/kronos/templates/newsletter_template.html b/src/kronos/templates/newsletter_template.html
new file mode 100644
index 0000000..a0ebbbc
--- /dev/null
+++ b/src/kronos/templates/newsletter_template.html
@@ -0,0 +1,103 @@
+<!DOCTYPE html>
+<html lang="plr">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Najbliższe wydarzenia w Hackerspace Trójmiasto (HS3)</title>
+  <style>
+    /* Dark mode */
+    @media (prefers-color-scheme: dark) {
+      .dark-mode-button {
+        background: #ffffff !important;
+        color: #000000 !important;
+        border: 1px solid #cccccc !important;
+      }
+    }
+
+    @media only screen and (max-width: 600px) {
+      .event-table {
+        display: block !important;
+        width: 100% !important;
+      }
+      .event-table tbody,
+      .event-table tr,
+      .event-table td {
+        display: block !important;
+        width: 100% !important;
+        box-sizing: border-box !important;
+      }
+      .event-image {
+        text-align: center !important;
+        padding: 20px 20px 10px 20px !important;
+      }
+      .event-content {
+        padding: 10px 10px 20px 10px !important;
+        width: 100% !important;
+      }
+      .event-image img {
+        width: 100% !important;
+        height: auto !important;
+        max-width: 300px !important;
+      }
+      /* Simplification mobile */
+      .event-content * {
+        max-width: none !important;
+        width: auto !important;
+        display: inline-block !important;
+        white-space: normal !important;
+      }
+      .event-content h2 {
+        display: block !important;
+        width: 100% !important;
+      }
+      .event-content a {
+        display: inline-block !important;
+        width: auto !important;
+        max-width: 200px !important;
+      }
+      .event-content div[style*="background:#ff7105"] {
+        white-space: nowrap !important;
+        font-size: 12px !important;
+        padding: 4px 8px !important;
+      }
+    }
+  </style>
+</head>
+<body style="background-color:#f0f2f5; font-family:Helvetica,Arial,sans-serif; color:#333; padding:20px;">
+  <div style="max-width:800px; margin:0 auto; background:#fff; border-radius:8px; overflow:hidden; box-shadow:0 4px 16px #eee;">
+    <div style="text-align:center; padding:40px 20px 20px 20px; background:#4B64F2;">
+      <img src="https://img.notionusercontent.com/s3/prod-files-secure%2F00deef52-50e0-4f54-b2ee-5c2fbc2c4c6d%2F2ad5c423-a798-4a76-9a07-9be972f119cb%2FHS_LOGO_COLOR_BLACK.png/size/w=1440?exp=1773155386&sig=QdEp5ee-WNVt8umc9b3zwnO4lrUpbwRKYym5aG0zyL4&id=89cbb915-e2d5-4d18-85d7-2c8cf5bae1b5&table=block" alt="Hackerspace Trójmiasto" style="width:230px; display:block; margin:0 auto 24px auto;">
+      <h1 style="color:#fff; font-size:24px; font-weight:500; margin:0;">NAJBLIŻSZE WYDARZENIA W HACKERSPACE TRÓJMIASTO (HS3)</h1>
+    </div>
+    <div style="padding:32px 10px 10px 10px; overflow-x:hidden;">
+      {% for event in events %}
+      <table class="event-table" width="100%" cellpadding="0" cellspacing="0" border="0" style="margin-bottom:32px; background:#fff; border-radius:8px; border:1px solid #eee; table-layout:fixed;">
+        <tr>
+          {% if event.picture_url %}
+          <td class="event-image" width="220" valign="top" style="padding:20px;">
+            <img src="{{ event.picture_url }}" alt="Photo de l'événement" style="display:block; max-width:200px; height:auto;">
+          </td>
+          {% endif %}
+          <td class="event-content" valign="top" style="padding:20px; overflow:hidden;">
+            <h2 style="font-size:20px; color:#2a2a2a; margin:0 0 8px 0; line-height:1.2; max-width:100%; white-space:normal;">{{ event.title }}</h2>
+            <div style="background:#ff7105; color:#fff; padding:6px 12px; border-radius:20px; font-size:14px; margin-bottom:12px; margin-top:4px; display:inline-block; font-weight:500; white-space:nowrap;">
+              {{ event.full_date }}
+            </div>
+            {% if event.location %}
+            <div style="font-size:15px; color:#000; font-weight:500; margin-bottom:6px; max-width:100%; white-space:normal;">Gdzie : {{ event.location }}</div>
+            {% endif %}
+            <div style="font-size:15px; color:#444; margin-bottom:12px; max-width:100%; white-space:normal;">{{ event.description }}</div>
+            {% if event.link %}
+            <a href="{{ event.link }}" class="dark-mode-button" style="display:inline-block; background:#4B64F2; color:#fff; text-decoration:none; padding:10px 20px; border-radius:4px; font-weight:500;">Sprawdź na HS3 Events</a>
+            {% endif %}
+          </td>
+        </tr>
+      </table>
+      {% endfor %}
+    </div>
+    <div style="padding:20px; text-align:center; font-size:14px; color:#777; background:#fafbfd;">
+      <p>Otrzymujesz ten newsletter ponieważ jesteś super cool 1337 osobą subskrybującą info HS3.</p>
+    </div>
+  </div>
+</body>
+</html>

From e0eb0b4617113b0d5fb1b1fdff685dfd21333986 Mon Sep 17 00:00:00 2001
From: Piotr Gaczkowski <DoomHammerNG@gmail.com>
Date: Mon, 13 Apr 2026 10:53:07 +0200
Subject: [PATCH 2/3] chore: Implement code review suggestions

---
 .envrc                                        |   4 +-
 .gitignore                                    |   3 +-
 README.md                                     |   6 +
 devenv.nix                                    |  21 ++-
 npins/default.nix                             | 146 ++++++++++++++++++
 npins/sources.json                            |  18 +++
 shell.nix                                     |  11 +-
 src/kronos/main.py                            |   8 +-
 .../newsletter_template.html                  |   0
 9 files changed, 203 insertions(+), 14 deletions(-)
 create mode 100644 npins/default.nix
 create mode 100644 npins/sources.json
 rename {src/kronos/templates => templates}/newsletter_template.html (100%)

diff --git a/.envrc b/.envrc
index 0d4fe40..97abe0c 100644
--- a/.envrc
+++ b/.envrc
@@ -1,12 +1,14 @@
 #!/usr/bin/env bash
 
+# Install nix_direnv for better caching and handling of nix configuration
 if ! has nix_direnv_version || ! nix_direnv_version 3.0.5; then
   source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.5/direnvrc" "sha256-RuwIS+QKFj/T9M2TFXScjBsLR6V3A17YVoEW/Q6AZ1w="
 fi
 watch_file nix/*.nix
+# shell.nix allows using devenv on nix systems that don't have devenv installed
 use nix
 
-export DIRENV_WARN_TIMEOUT=20s
+export DIRENV_WARN_TIMEOUT=30s
 
 eval "$(devenv direnvrc)"
 
diff --git a/.gitignore b/.gitignore
index d29838a..84365d3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,5 @@ __pycache__/
 *.egg-info/
 .env*
 *.pickle
-src/kronos/*events*.html
+dist/
+result
diff --git a/README.md b/README.md
index 5c01ed4..05ca4e0 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,12 @@ Share events between services.
 
 Nix is required.
 
+- Add cachix binary cache (this will speed up building):
+
+```bash
+cachix use hs3city
+```
+
 - Set up environment.
 
 ```bash
diff --git a/devenv.nix b/devenv.nix
index 8d8e23d..c46ffe5 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -2,14 +2,21 @@
 {
   name = "kronos";
 
-  languages.python = {
-    enable = true;
-    venv.enable = true;
-    version = "3.13.0";
-    uv = {
+  cachix = {
+    pull = [ "hs3city" ];
+    push = "hs3city";
+  };
+
+  languages = {
+    python = {
       enable = true;
-      sync.enable = true;
-      sync.allExtras = true;
+      venv.enable = true;
+      version = "3.13.0";
+      uv = {
+        enable = true;
+        sync.enable = true;
+        sync.allExtras = true;
+      };
     };
   };
 
diff --git a/npins/default.nix b/npins/default.nix
new file mode 100644
index 0000000..6592476
--- /dev/null
+++ b/npins/default.nix
@@ -0,0 +1,146 @@
+/*
+  This file is provided under the MIT licence:
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+# Generated by npins. Do not modify; will be overwritten regularly
+let
+  data = builtins.fromJSON (builtins.readFile ./sources.json);
+  version = data.version;
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
+  range =
+    first: last: if first > last then [ ] else builtins.genList (n: first + n) (last - first + 1);
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
+  stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
+  stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
+  concatMapStrings = f: list: concatStrings (map f list);
+  concatStrings = builtins.concatStringsSep "";
+
+  # If the environment variable NPINS_OVERRIDE_${name} is set, then use
+  # the path directly as opposed to the fetched source.
+  # (Taken from Niv for compatibility)
+  mayOverride =
+    name: path:
+    let
+      envVarName = "NPINS_OVERRIDE_${saneName}";
+      saneName = stringAsChars (c: if (builtins.match "[a-zA-Z0-9]" c) == null then "_" else c) name;
+      ersatz = builtins.getEnv envVarName;
+    in
+    if ersatz == "" then
+      path
+    else
+      # this turns the string into an actual Nix path (for both absolute and
+      # relative paths)
+      builtins.trace "Overriding path of \"${name}\" with \"${ersatz}\" due to set \"${envVarName}\"" (
+        if builtins.substring 0 1 ersatz == "/" then
+          /. + ersatz
+        else
+          /. + builtins.getEnv "PWD" + "/${ersatz}"
+      );
+
+  mkSource =
+    name: spec:
+    assert spec ? type;
+    let
+      path =
+        if spec.type == "Git" then
+          mkGitSource spec
+        else if spec.type == "GitRelease" then
+          mkGitSource spec
+        else if spec.type == "PyPi" then
+          mkPyPiSource spec
+        else if spec.type == "Channel" then
+          mkChannelSource spec
+        else if spec.type == "Tarball" then
+          mkTarballSource spec
+        else
+          builtins.throw "Unknown source type ${spec.type}";
+    in
+    spec // { outPath = mayOverride name path; };
+
+  mkGitSource =
+    {
+      repository,
+      revision,
+      url ? null,
+      submodules,
+      hash,
+      branch ? null,
+      ...
+    }:
+    assert repository ? type;
+    # At the moment, either it is a plain git repository (which has an url), or it is a GitHub/GitLab repository
+    # In the latter case, there we will always be an url to the tarball
+    if url != null && !submodules then
+      builtins.fetchTarball {
+        inherit url;
+        sha256 = hash; # FIXME: check nix version & use SRI hashes
+      }
+    else
+      let
+        url =
+          if repository.type == "Git" then
+            repository.url
+          else if repository.type == "GitHub" then
+            "https://github.com/${repository.owner}/${repository.repo}.git"
+          else if repository.type == "GitLab" then
+            "${repository.server}/${repository.repo_path}.git"
+          else
+            throw "Unrecognized repository type ${repository.type}";
+        urlToName =
+          url: rev:
+          let
+            matched = builtins.match "^.*/([^/]*)(\\.git)?$" url;
+
+            short = builtins.substring 0 7 rev;
+
+            appendShort = if (builtins.match "[a-f0-9]*" rev) != null then "-${short}" else "";
+          in
+          "${if matched == null then "source" else builtins.head matched}${appendShort}";
+        name = urlToName url revision;
+      in
+      builtins.fetchGit {
+        rev = revision;
+        inherit name;
+        # hash = hash;
+        inherit url submodules;
+      };
+
+  mkPyPiSource =
+    { url, hash, ... }:
+    builtins.fetchurl {
+      inherit url;
+      sha256 = hash;
+    };
+
+  mkChannelSource =
+    { url, hash, ... }:
+    builtins.fetchTarball {
+      inherit url;
+      sha256 = hash;
+    };
+
+  mkTarballSource =
+    {
+      url,
+      locked_url ? url,
+      hash,
+      ...
+    }:
+    builtins.fetchTarball {
+      url = locked_url;
+      sha256 = hash;
+    };
+in
+if version == 5 then
+  builtins.mapAttrs mkSource data.pins
+else
+  throw "Unsupported format version ${toString version} in sources.json. Try running `npins upgrade`"
diff --git a/npins/sources.json b/npins/sources.json
new file mode 100644
index 0000000..6ee51c7
--- /dev/null
+++ b/npins/sources.json
@@ -0,0 +1,18 @@
+{
+  "pins": {
+    "nixpkgs": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "nixos",
+        "repo": "nixpkgs"
+      },
+      "branch": "nixos-25.11",
+      "submodules": false,
+      "revision": "54170c54449ea4d6725efd30d719c5e505f1c10e",
+      "url": "https://github.com/nixos/nixpkgs/archive/54170c54449ea4d6725efd30d719c5e505f1c10e.tar.gz",
+      "hash": "0ayx6v3wwvqpdjkbfnbgyp7rwnsypgn6willidza61x9ilmxkqdp"
+    }
+  },
+  "version": 5
+}
diff --git a/shell.nix b/shell.nix
index 2f26af8..528b29b 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,15 @@
+# Use npins to pin nixpkgs dependencies
+# This makes it easier to cache build results
 {
-  pkgs ? import <nixpkgs> { },
+  sources ? import ./npins,
+  system ? builtins.currentSystem,
+  pkgs ? import sources.nixpkgs {
+    inherit system;
+    config = { };
+    overlays = [ ];
+  },
 }:
+# Create a nix shell with devenv (so `use devenv` can work in direnv/.envrc)
 pkgs.mkShell {
   buildInputs = with pkgs; [
     devenv
diff --git a/src/kronos/main.py b/src/kronos/main.py
index c747734..25e9219 100755
--- a/src/kronos/main.py
+++ b/src/kronos/main.py
@@ -222,17 +222,17 @@ def _main():
 
     events = prepare_events_for_template(raw_events)
 
-    script_dir = os.path.dirname(os.path.abspath(__file__))
+    os.makedirs("dist", exist_ok=True)
+    output_path = os.path.join(os.getcwd(), "dist", OUTPUT_FILENAME)
     html_output = render_newsletter(
-      events=events, template_dir=script_dir, template_name=TEMPLATE_FILENAME
+      events=events, template_dir=os.getcwd(), template_name=TEMPLATE_FILENAME
     )
 
-    output_path = os.path.join(script_dir, OUTPUT_FILENAME)
     with open(output_path, "w", encoding="utf-8") as f:
       f.write(html_output)
     print(f"File '{output_path}' generated successfully.", file=sys.stderr)
 
-    inlined_output_path = os.path.join(script_dir, "newsletter_events_inlined.html")
+    inlined_output_path = os.path.join(os.getcwd(), "dist", "newsletter_events_inlined.html")
     inline_css(output_path, inlined_output_path)
     print(
       f"File '{inlined_output_path}' (inline CSS) generated.",
diff --git a/src/kronos/templates/newsletter_template.html b/templates/newsletter_template.html
similarity index 100%
rename from src/kronos/templates/newsletter_template.html
rename to templates/newsletter_template.html

From 2ec156422bf9eb3634ee9f02554f4d34869ff9a8 Mon Sep 17 00:00:00 2001
From: Piotr Gaczkowski <doomhammer@hs3.pl>
Date: Mon, 20 Apr 2026 18:42:04 +0000
Subject: [PATCH 3/3] feat: Add initial Mobilizon => Discord sync (#1)

Closes #2 , #3

Co-authored-by: Piotr Gaczkowski <DoomHammerNG@gmail.com>
Reviewed-on: https://forge.hs3.pl/leming/kronos/pulls/1
Reviewed-by: leming leming <leming@hs3.pl>
---
 .envrc                             |  10 +-
 .gitignore                         |   4 +
 .pre-commit-config.yaml            |   2 +-
 README.md                          |   8 +-
 devenv.nix                         |  44 ++++-
 kronos/main.py                     |  11 --
 npins/default.nix                  | 146 +++++++++++++++++
 npins/sources.json                 |  18 ++
 pyproject.toml                     |  97 +++++++----
 shell.nix                          |  17 ++
 {kronos => src/kronos}/__init__.py |   0
 src/kronos/discordbot.py           |  86 ++++++++++
 src/kronos/main.py                 | 253 +++++++++++++++++++++++++++++
 templates/newsletter_template.html | 103 ++++++++++++
 14 files changed, 742 insertions(+), 57 deletions(-)
 delete mode 100755 kronos/main.py
 create mode 100644 npins/default.nix
 create mode 100644 npins/sources.json
 create mode 100644 shell.nix
 rename {kronos => src/kronos}/__init__.py (100%)
 create mode 100644 src/kronos/discordbot.py
 create mode 100755 src/kronos/main.py
 create mode 100644 templates/newsletter_template.html

diff --git a/.envrc b/.envrc
index cc5c18b..97abe0c 100644
--- a/.envrc
+++ b/.envrc
@@ -1,6 +1,14 @@
 #!/usr/bin/env bash
 
-export DIRENV_WARN_TIMEOUT=20s
+# Install nix_direnv for better caching and handling of nix configuration
+if ! has nix_direnv_version || ! nix_direnv_version 3.0.5; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.5/direnvrc" "sha256-RuwIS+QKFj/T9M2TFXScjBsLR6V3A17YVoEW/Q6AZ1w="
+fi
+watch_file nix/*.nix
+# shell.nix allows using devenv on nix systems that don't have devenv installed
+use nix
+
+export DIRENV_WARN_TIMEOUT=30s
 
 eval "$(devenv direnvrc)"
 
diff --git a/.gitignore b/.gitignore
index ba0403c..84365d3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,7 @@ devenv.lock
 uv.lock
 __pycache__/
 *.egg-info/
+.env*
+*.pickle
+dist/
+result
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e552a88..982fb0b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -25,7 +25,7 @@ repos:
       - id: ruff-format
         name: Ruff format
         description: Format.
-        entry: ruff format --check --config pyproject.toml
+        entry: ruff format --config pyproject.toml
         language: system
         types: [python]
 
diff --git a/README.md b/README.md
index 3dcafbc..05ca4e0 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,12 @@ Share events between services.
 
 Nix is required.
 
+- Add cachix binary cache (this will speed up building):
+
+```bash
+cachix use hs3city
+```
+
 - Set up environment.
 
 ```bash
@@ -21,7 +27,7 @@ pre-commit install
 - Install as editable package.
 
 ```bash
-pip install -e .
+uv pip install -e .
 ```
 
 ## Run
diff --git a/devenv.nix b/devenv.nix
index a3ed509..c46ffe5 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -1,14 +1,44 @@
+{ pkgs, ... }:
 {
   name = "kronos";
 
-  languages.python = {
-    enable = true;
-    venv.enable = true;
-    version = "3.13.0";
-    uv = {
+  cachix = {
+    pull = [ "hs3city" ];
+    push = "hs3city";
+  };
+
+  languages = {
+    python = {
       enable = true;
-      sync.enable = true;
-      sync.allExtras = true;
+      venv.enable = true;
+      version = "3.13.0";
+      uv = {
+        enable = true;
+        sync.enable = true;
+        sync.allExtras = true;
+      };
     };
   };
+
+  packages = [
+    pkgs.uv
+  ];
+
+  enterShell = ''
+    echo
+    echo "🪝 Installing pre-commit"
+    echo
+    pre-commit install
+
+    echo
+    echo "✨ Installing kronos"
+    echo
+    uv pip install -e .
+
+    echo
+    echo "🙌 Welcome to kronos' devenv!"
+    echo 'To run kronos, type `kronos`'
+    echo
+    echo
+  '';
 }
diff --git a/kronos/main.py b/kronos/main.py
deleted file mode 100755
index 8aae611..0000000
--- a/kronos/main.py
+++ /dev/null
@@ -1,11 +0,0 @@
-from argparse import ArgumentParser
-
-
-def _main():
-    parser = ArgumentParser(prog="kronos", description="Share events between services.")
-    parser.add_argument("--name")
-    _args = parser.parse_args()
-
-
-if __name__ == "__main__":
-    _main()
diff --git a/npins/default.nix b/npins/default.nix
new file mode 100644
index 0000000..6592476
--- /dev/null
+++ b/npins/default.nix
@@ -0,0 +1,146 @@
+/*
+  This file is provided under the MIT licence:
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+# Generated by npins. Do not modify; will be overwritten regularly
+let
+  data = builtins.fromJSON (builtins.readFile ./sources.json);
+  version = data.version;
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
+  range =
+    first: last: if first > last then [ ] else builtins.genList (n: first + n) (last - first + 1);
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
+  stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
+  stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
+  concatMapStrings = f: list: concatStrings (map f list);
+  concatStrings = builtins.concatStringsSep "";
+
+  # If the environment variable NPINS_OVERRIDE_${name} is set, then use
+  # the path directly as opposed to the fetched source.
+  # (Taken from Niv for compatibility)
+  mayOverride =
+    name: path:
+    let
+      envVarName = "NPINS_OVERRIDE_${saneName}";
+      saneName = stringAsChars (c: if (builtins.match "[a-zA-Z0-9]" c) == null then "_" else c) name;
+      ersatz = builtins.getEnv envVarName;
+    in
+    if ersatz == "" then
+      path
+    else
+      # this turns the string into an actual Nix path (for both absolute and
+      # relative paths)
+      builtins.trace "Overriding path of \"${name}\" with \"${ersatz}\" due to set \"${envVarName}\"" (
+        if builtins.substring 0 1 ersatz == "/" then
+          /. + ersatz
+        else
+          /. + builtins.getEnv "PWD" + "/${ersatz}"
+      );
+
+  mkSource =
+    name: spec:
+    assert spec ? type;
+    let
+      path =
+        if spec.type == "Git" then
+          mkGitSource spec
+        else if spec.type == "GitRelease" then
+          mkGitSource spec
+        else if spec.type == "PyPi" then
+          mkPyPiSource spec
+        else if spec.type == "Channel" then
+          mkChannelSource spec
+        else if spec.type == "Tarball" then
+          mkTarballSource spec
+        else
+          builtins.throw "Unknown source type ${spec.type}";
+    in
+    spec // { outPath = mayOverride name path; };
+
+  mkGitSource =
+    {
+      repository,
+      revision,
+      url ? null,
+      submodules,
+      hash,
+      branch ? null,
+      ...
+    }:
+    assert repository ? type;
+    # At the moment, either it is a plain git repository (which has an url), or it is a GitHub/GitLab repository
+    # In the latter case, there we will always be an url to the tarball
+    if url != null && !submodules then
+      builtins.fetchTarball {
+        inherit url;
+        sha256 = hash; # FIXME: check nix version & use SRI hashes
+      }
+    else
+      let
+        url =
+          if repository.type == "Git" then
+            repository.url
+          else if repository.type == "GitHub" then
+            "https://github.com/${repository.owner}/${repository.repo}.git"
+          else if repository.type == "GitLab" then
+            "${repository.server}/${repository.repo_path}.git"
+          else
+            throw "Unrecognized repository type ${repository.type}";
+        urlToName =
+          url: rev:
+          let
+            matched = builtins.match "^.*/([^/]*)(\\.git)?$" url;
+
+            short = builtins.substring 0 7 rev;
+
+            appendShort = if (builtins.match "[a-f0-9]*" rev) != null then "-${short}" else "";
+          in
+          "${if matched == null then "source" else builtins.head matched}${appendShort}";
+        name = urlToName url revision;
+      in
+      builtins.fetchGit {
+        rev = revision;
+        inherit name;
+        # hash = hash;
+        inherit url submodules;
+      };
+
+  mkPyPiSource =
+    { url, hash, ... }:
+    builtins.fetchurl {
+      inherit url;
+      sha256 = hash;
+    };
+
+  mkChannelSource =
+    { url, hash, ... }:
+    builtins.fetchTarball {
+      inherit url;
+      sha256 = hash;
+    };
+
+  mkTarballSource =
+    {
+      url,
+      locked_url ? url,
+      hash,
+      ...
+    }:
+    builtins.fetchTarball {
+      url = locked_url;
+      sha256 = hash;
+    };
+in
+if version == 5 then
+  builtins.mapAttrs mkSource data.pins
+else
+  throw "Unsupported format version ${toString version} in sources.json. Try running `npins upgrade`"
diff --git a/npins/sources.json b/npins/sources.json
new file mode 100644
index 0000000..6ee51c7
--- /dev/null
+++ b/npins/sources.json
@@ -0,0 +1,18 @@
+{
+  "pins": {
+    "nixpkgs": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "nixos",
+        "repo": "nixpkgs"
+      },
+      "branch": "nixos-25.11",
+      "submodules": false,
+      "revision": "54170c54449ea4d6725efd30d719c5e505f1c10e",
+      "url": "https://github.com/nixos/nixpkgs/archive/54170c54449ea4d6725efd30d719c5e505f1c10e.tar.gz",
+      "hash": "0ayx6v3wwvqpdjkbfnbgyp7rwnsypgn6willidza61x9ilmxkqdp"
+    }
+  },
+  "version": 5
+}
diff --git a/pyproject.toml b/pyproject.toml
index c55d976..185fa2f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,11 +4,36 @@ version = "0.1.0"
 description = "Share events between services."
 authors = [{ name = "Hackerspace Trójmiasto" }]
 readme = "README.md"
-license = { file = "LICENSE" }
+license-files = ["LICENSE"]
 
 requires-python = ">=3.13"
 
-dependencies = []
+dependencies = [
+  "beautifulsoup4==4.13.4",
+  "brevo-python==1.1.2",
+  "bs4==0.0.2",
+  "cachetools==6.1.0",
+  "certifi==2025.4.26",
+  "charset-normalizer==3.4.2",
+  "cssselect==1.3.0",
+  "cssutils==2.11.1",
+  "discord.py==2.7.1",
+  "html5lib==1.1",
+  "idna==3.10",
+  "Jinja2==3.1.6",
+  "lxml==6.0.0",
+  "MarkupSafe==3.0.2",
+  "more-itertools==10.7.0",
+  "premailer==3.10.0",
+  "python-dateutil==2.9.0.post0",
+  "python-dotenv==1.1.1",
+  "requests==2.32.4",
+  "six==1.17.0",
+  "soupsieve==2.7",
+  "typing_extensions==4.14.0",
+  "urllib3==2.5.0",
+  "webencodings==0.5.1",
+]
 
 [dependency-groups]
 dev = ["pre-commit", "pre-commit-hooks", "pytest", "ruff"]
@@ -18,47 +43,47 @@ kronos = "kronos.main:_main"
 
 [tool.ruff]
 exclude = [
-    ".bzr",
-    ".direnv",
-    ".eggs",
-    ".git",
-    ".git-rewrite",
-    ".hg",
-    ".ipynb_checkpoints",
-    ".mypy_cache",
-    ".nox",
-    ".pants.d",
-    ".pyenv",
-    ".pytest_cache",
-    ".pytype",
-    ".ruff_cache",
-    ".svn",
-    ".tox",
-    ".venv",
-    ".vscode",
-    "__pypackages__",
-    "_build",
-    "buck-out",
-    "build",
-    "dist",
-    "node_modules",
-    "site-packages",
-    "venv",
+  ".bzr",
+  ".direnv",
+  ".eggs",
+  ".git",
+  ".git-rewrite",
+  ".hg",
+  ".ipynb_checkpoints",
+  ".mypy_cache",
+  ".nox",
+  ".pants.d",
+  ".pyenv",
+  ".pytest_cache",
+  ".pytype",
+  ".ruff_cache",
+  ".svn",
+  ".tox",
+  ".venv",
+  ".vscode",
+  "__pypackages__",
+  "_build",
+  "buck-out",
+  "build",
+  "dist",
+  "node_modules",
+  "site-packages",
+  "venv",
 ]
 
 line-length = 100
-indent-width = 4
+indent-width = 2
 target-version = "py313"
 
 [tool.ruff.lint]
 select = [
-    # pycodestyle
-    "E",
-    "W",
-    # pyflakes
-    "F",
-    # pylint
-    "PL",
+  # pycodestyle
+  "E",
+  "W",
+  # pyflakes
+  "F",
+  # pylint
+  "PL",
 ]
 ignore = []
 fixable = ["ALL"]
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..528b29b
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,17 @@
+# Use npins to pin nixpkgs dependencies
+# This makes it easier to cache build results
+{
+  sources ? import ./npins,
+  system ? builtins.currentSystem,
+  pkgs ? import sources.nixpkgs {
+    inherit system;
+    config = { };
+    overlays = [ ];
+  },
+}:
+# Create a nix shell with devenv (so `use devenv` can work in direnv/.envrc)
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    devenv
+  ];
+}
diff --git a/kronos/__init__.py b/src/kronos/__init__.py
similarity index 100%
rename from kronos/__init__.py
rename to src/kronos/__init__.py
diff --git a/src/kronos/discordbot.py b/src/kronos/discordbot.py
new file mode 100644
index 0000000..71ff78e
--- /dev/null
+++ b/src/kronos/discordbot.py
@@ -0,0 +1,86 @@
+import pickle
+import os.path
+import urllib.request
+
+import discord
+
+
+class KronosBot(discord.Client):
+  def attach_events(self, events):
+    print(f"Adding {len(events)} events")
+    self.events = events
+
+  async def on_ready(self):
+    event_mapping_file = "event_mapping.pickle"
+    event_mapping = dict()
+
+    try:
+      if os.path.isfile(event_mapping_file):
+        with open(event_mapping_file, "rb") as f:
+          event_mapping = pickle.load(f)
+    except Exception:
+      print("There are problems opening the pickle jar")
+
+    try:
+      print(f"Logged on as {self.user}!")
+      guilds_total = len(self.guilds)
+      print(f"I work for {guilds_total} guilds")
+      guilds_processed = 0
+      for guild in self.guilds:
+        guild_id = str(guild)
+        print(f"Processing {guild.name} as {guild.me.name}")
+        guilds_processed += 1
+        for event in self.events:
+          description = event["link"] + "\n\n" + event["description"]
+
+          picture_url = "https://hs3.pl/images/zasoby/null.jpg"
+          if event["picture_url"] is not None:
+            picture_url = event["picture_url"]
+          pic = urllib.request.urlopen(picture_url).read()
+
+          print(f"Processing event {event}")
+          if event["link"] in event_mapping and guild_id in event_mapping[event["link"]]:
+            print("Updating the event, this one already processed")
+            discord_event = guild.get_scheduled_event(event_mapping[event["link"]][guild_id])
+            if discord_event is not None:
+              await discord_event.edit(
+                name=event["title"],
+                description=description,
+                start_time=event["start_time"],
+                end_time=event["end_time"],
+                location=event["location"],
+                image=pic,
+              )
+          else:
+            discord_event = await guild.create_scheduled_event(
+              name=event["title"],
+              description=description,
+              start_time=event["start_time"],
+              end_time=event["end_time"],
+              location=event["location"],
+              image=pic,
+              entity_type=discord.EntityType.external,
+              privacy_level=discord.PrivacyLevel.guild_only,
+            )
+            if event["link"] not in event_mapping:
+              event_mapping[event["link"]] = dict()
+            event_mapping[event["link"]][guild_id] = discord_event.id
+            print(f"Mobilizon event {event['link']} mapped to Discord event {discord_event.id}")
+
+      print(f"Dumping event mapping to a pickle: {event_mapping}")
+      with open(event_mapping_file, "wb") as f:
+        pickle.dump(event_mapping, f)
+    except Exception:
+      print("There are problems processing the events, mate")
+
+    print("So long, and thanks for all the fish!")
+    await self.close()
+
+  async def on_message(self, message):
+    print(f"Message from {message.author}: {message.content}")
+
+
+intents = discord.Intents.default()
+intents.message_content = False
+
+client = KronosBot(intents=intents)
diff --git a/src/kronos/main.py b/src/kronos/main.py
new file mode 100755
index 0000000..25e9219
--- /dev/null
+++ b/src/kronos/main.py
@@ -0,0 +1,253 @@
+import datetime
+import os
+import sys
+from zoneinfo import ZoneInfo
+from argparse import ArgumentParser
+
+import requests
+from bs4 import BeautifulSoup
+from dotenv import load_dotenv
+from jinja2 import Environment, FileSystemLoader, select_autoescape
+from premailer import transform
+
+from .discordbot import KronosBot, intents
+
+
+MOBILIZON_API_URL = "https://events.hs3.pl/api"
+QUERY_LIMIT = 100
+TIME_WINDOW_DAYS = 365
+TRUNCATE_AFTER_CHARACTERS = 300
+TEMPLATE_FILENAME = "templates/newsletter_template.html"
+OUTPUT_FILENAME = "newsletter_events.html"
+
+
+def sanitize_html(raw_html: str) -> str:
+  wrapper = f"<div>{raw_html}</div>"
+  soup = BeautifulSoup(wrapper, "html5lib")
+  div = soup.find("div")
+  cleaned = "".join(str(child) for child in div.contents)
+  return cleaned
+
+
+def get_time_window(days: int = 365):
+  now_utc = datetime.datetime.now(datetime.timezone.utc)
+  ends_utc = now_utc + datetime.timedelta(days=days)
+
+  begins_iso = now_utc.replace(microsecond=0).isoformat().replace("+00:00", "Z")
+  ends_iso = ends_utc.replace(microsecond=0).isoformat().replace("+00:00", "Z")
+  return begins_iso, ends_iso
+
+
+def build_graphql_query():
+  return """
+    query SearchEventsInWindow($beginsOn: DateTime, $endsOn: DateTime, $limit: Int) {
+      searchEvents(beginsOn: $beginsOn, endsOn: $endsOn, limit: $limit) {
+        total
+        elements {
+          __typename
+          ... on Event {
+            id
+            title
+            description
+            beginsOn
+            picture {
+              url
+            }
+            url
+            physicalAddress {
+              description
+              locality
+            }
+          }
+        }
+      }
+    }
+    """
+
+
+def fetch_events(begins_on: str, ends_on: str, limit: int = QUERY_LIMIT):
+  query = build_graphql_query()
+  variables = {"beginsOn": begins_on, "endsOn": ends_on, "limit": limit}
+  payload = {"query": query, "variables": variables}
+  headers = {"Content-Type": "application/json"}
+
+  resp = requests.post(MOBILIZON_API_URL, json=payload, headers=headers)
+  resp.raise_for_status()
+  data = resp.json()
+  if "errors" in data:
+    raise RuntimeError(f"GraphQL error: {data['errors']}")
+
+  events = []
+  for elem in data["data"]["searchEvents"]["elements"]:
+    if elem.get("__typename") == "Event":
+      begins_iso = elem.get("beginsOn")
+      if begins_iso:
+        dt = datetime.datetime.fromisoformat(begins_iso.replace("Z", "+00:00"))
+        dt_begins = datetime.datetime.fromisoformat(begins_on.replace("Z", "+00:00"))
+        dt_ends = datetime.datetime.fromisoformat(ends_on.replace("Z", "+00:00"))
+        if dt_begins <= dt < dt_ends:
+          events.append(elem)
+  return events
+
+
+def prepare_events_for_template(raw_events: list) -> list:
+  jours_semaine = [
+    "poniedziałek",
+    "wtorek",
+    "środa",
+    "czwartek",
+    "piątek",
+    "sobota",
+    "niedziela",
+  ]
+  mois_annee = [
+    "",
+    "stycznia",
+    "lutego",
+    "marca",
+    "kwietnia",
+    "maja",
+    "czerwca",
+    "lipca",
+    "sierpnia",
+    "września",
+    "października",
+    "listopada",
+    "grudnia",
+  ]
+
+  prepared = []
+  for ev in raw_events:
+    title = ev.get("title", "Untitled")
+
+    raw_desc = ev.get("description") or ""
+    cleaned_html = sanitize_html(raw_desc)
+
+    text_only = BeautifulSoup(cleaned_html, "html.parser").get_text()
+    if len(text_only) > TRUNCATE_AFTER_CHARACTERS:
+      truncated = text_only[:300].rstrip() + " …"
+    else:
+      truncated = text_only
+
+    begins_iso = ev.get("beginsOn")
+    picture = ev.get("picture")
+    picture_url = picture.get("url") if picture else None
+    link = ev.get("url") or ""
+
+    if picture_url and "?" in picture_url:
+      picture_url = picture_url.split("?", 1)[0]
+
+    phys = ev.get("physicalAddress")
+    if phys:
+      part1 = phys.get("description") or ""
+      part2 = phys.get("locality") or ""
+      location = ", ".join(x for x in (part1, part2) if x.strip())
+    else:
+      location = ""
+
+    dt_utc = datetime.datetime.fromisoformat(begins_iso.replace("Z", "+00:00"))
+    dt_paris = dt_utc.astimezone(ZoneInfo("Europe/Paris"))
+    jour_nom = jours_semaine[dt_paris.weekday()]
+    jour_num = dt_paris.day
+    mois_nom = mois_annee[dt_paris.month]
+    annee = dt_paris.year
+    heure = dt_paris.hour
+    minute = dt_paris.minute
+    minute_str = f"{minute:02d}"
+    full_date = f"{jour_nom}, {jour_num} {mois_nom} {annee} @ {heure}:{minute_str}"
+
+    prepared.append(
+      {
+        "title": title,
+        "description": truncated,
+        "full_date": full_date,
+        "picture_url": picture_url,
+        "location": location,
+        "link": link,
+        "start_time": dt_utc,
+        "end_time": dt_utc + datetime.timedelta(hours=1),
+      }
+    )
+
+  return prepared
+
+
+def render_newsletter(events: list, template_dir: str, template_name: str) -> str:
+  env = Environment(
+    loader=FileSystemLoader(searchpath=template_dir),
+    autoescape=select_autoescape(["html", "xml"]),
+  )
+  template = env.get_template(template_name)
+
+  now_paris = datetime.datetime.now(ZoneInfo("Europe/Paris")).strftime("%Y-%m-%d %H:%M")
+  return template.render(events=events, date_now=now_paris)
+
+
+def inline_css(input_html_path, output_html_path):
+  with open(input_html_path, "r", encoding="utf-8") as f:
+    html = f.read()
+  inlined_html = transform(html)
+  with open(output_html_path, "w", encoding="utf-8") as f:
+    f.write(inlined_html)
+
+
+def _main():
+  load_dotenv()
+
+  parser = ArgumentParser(prog="kronos", description="Share events between services.")
+  parser.add_argument("--name")
+  _args = parser.parse_args()
+
+  try:
+    begins_on, ends_on = get_time_window(days=TIME_WINDOW_DAYS)
+    print(
+      f"Fetching events between {begins_on} and {ends_on}...",
+      file=sys.stderr,
+    )
+
+    raw_events = list(
+      filter(
+        lambda x: "https://events.hs3.pl/" in x.get("url", ""),
+        fetch_events(begins_on, ends_on),
+      )
+    )
+    if not raw_events:
+      print("No events found in the requested period.", file=sys.stderr)
+      sys.exit(0)
+
+    for ev in raw_events:
+      print(f"{ev.get('title', 'Untitled')} — {ev.get('beginsOn', 'Unknown date')}")
+
+    raw_events.sort(key=lambda ev: ev.get("beginsOn", ""))
+
+    events = prepare_events_for_template(raw_events)
+
+    os.makedirs("dist", exist_ok=True)
+    output_path = os.path.join(os.getcwd(), "dist", OUTPUT_FILENAME)
+    html_output = render_newsletter(
+      events=events, template_dir=os.getcwd(), template_name=TEMPLATE_FILENAME
+    )
+
+    with open(output_path, "w", encoding="utf-8") as f:
+      f.write(html_output)
+    print(f"File '{output_path}' generated successfully.", file=sys.stderr)
+
+    inlined_output_path = os.path.join(os.getcwd(), "dist", "newsletter_events_inlined.html")
+    inline_css(output_path, inlined_output_path)
+    print(
+      f"File '{inlined_output_path}' (inline CSS) generated.",
+      file=sys.stderr,
+    )
+
+    discord_token = os.getenv("DISCORD_TOKEN")
+    client = KronosBot(intents=intents)
+    client.attach_events(events)
+    client.run(discord_token)
+
+  except Exception as exc:
+    print(f"Error: {exc}", file=sys.stderr)
+    sys.exit(1)
+
+
+if __name__ == "__main__":
+  _main()
diff --git a/templates/newsletter_template.html b/templates/newsletter_template.html
new file mode 100644
index 0000000..a0ebbbc
--- /dev/null
+++ b/templates/newsletter_template.html
@@ -0,0 +1,103 @@
+<!DOCTYPE html>
+<html lang="plr">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Najbliższe wydarzenia w Hackerspace Trójmiasto (HS3)</title>
+  <style>
+    /* Dark mode */
+    @media (prefers-color-scheme: dark) {
+      .dark-mode-button {
+        background: #ffffff !important;
+        color: #000000 !important;
+        border: 1px solid #cccccc !important;
+      }
+    }
+
+    @media only screen and (max-width: 600px) {
+      .event-table {
+        display: block !important;
+        width: 100% !important;
+      }
+      .event-table tbody,
+      .event-table tr,
+      .event-table td {
+        display: block !important;
+        width: 100% !important;
+        box-sizing: border-box !important;
+      }
+      .event-image {
+        text-align: center !important;
+        padding: 20px 20px 10px 20px !important;
+      }
+      .event-content {
+        padding: 10px 10px 20px 10px !important;
+        width: 100% !important;
+      }
+      .event-image img {
+        width: 100% !important;
+        height: auto !important;
+        max-width: 300px !important;
+      }
+      /* Simplification mobile */
+      .event-content * {
+        max-width: none !important;
+        width: auto !important;
+        display: inline-block !important;
+        white-space: normal !important;
+      }
+      .event-content h2 {
+        display: block !important;
+        width: 100% !important;
+      }
+      .event-content a {
+        display: inline-block !important;
+        width: auto !important;
+        max-width: 200px !important;
+      }
+      .event-content div[style*="background:#ff7105"] {
+        white-space: nowrap !important;
+        font-size: 12px !important;
+        padding: 4px 8px !important;
+      }
+    }
+  </style>
+</head>
+<body style="background-color:#f0f2f5; font-family:Helvetica,Arial,sans-serif; color:#333; padding:20px;">
+  <div style="max-width:800px; margin:0 auto; background:#fff; border-radius:8px; overflow:hidden; box-shadow:0 4px 16px #eee;">
+    <div style="text-align:center; padding:40px 20px 20px 20px; background:#4B64F2;">
+      <img src="https://img.notionusercontent.com/s3/prod-files-secure%2F00deef52-50e0-4f54-b2ee-5c2fbc2c4c6d%2F2ad5c423-a798-4a76-9a07-9be972f119cb%2FHS_LOGO_COLOR_BLACK.png/size/w=1440?exp=1773155386&sig=QdEp5ee-WNVt8umc9b3zwnO4lrUpbwRKYym5aG0zyL4&id=89cbb915-e2d5-4d18-85d7-2c8cf5bae1b5&table=block" alt="Hackerspace Trójmiasto" style="width:230px; display:block; margin:0 auto 24px auto;">
+      <h1 style="color:#fff; font-size:24px; font-weight:500; margin:0;">NAJBLIŻSZE WYDARZENIA W HACKERSPACE TRÓJMIASTO (HS3)</h1>
+    </div>
+    <div style="padding:32px 10px 10px 10px; overflow-x:hidden;">
+      {% for event in events %}
+      <table class="event-table" width="100%" cellpadding="0" cellspacing="0" border="0" style="margin-bottom:32px; background:#fff; border-radius:8px; border:1px solid #eee; table-layout:fixed;">
+        <tr>
+          {% if event.picture_url %}
+          <td class="event-image" width="220" valign="top" style="padding:20px;">
+            <img src="{{ event.picture_url }}" alt="Photo de l'événement" style="display:block; max-width:200px; height:auto;">
+          </td>
+          {% endif %}
+          <td class="event-content" valign="top" style="padding:20px; overflow:hidden;">
+            <h2 style="font-size:20px; color:#2a2a2a; margin:0 0 8px 0; line-height:1.2; max-width:100%; white-space:normal;">{{ event.title }}</h2>
+            <div style="background:#ff7105; color:#fff; padding:6px 12px; border-radius:20px; font-size:14px; margin-bottom:12px; margin-top:4px; display:inline-block; font-weight:500; white-space:nowrap;">
+              {{ event.full_date }}
+            </div>
+            {% if event.location %}
+            <div style="font-size:15px; color:#000; font-weight:500; margin-bottom:6px; max-width:100%; white-space:normal;">Gdzie : {{ event.location }}</div>
+            {% endif %}
+            <div style="font-size:15px; color:#444; margin-bottom:12px; max-width:100%; white-space:normal;">{{ event.description }}</div>
+            {% if event.link %}
+            <a href="{{ event.link }}" class="dark-mode-button" style="display:inline-block; background:#4B64F2; color:#fff; text-decoration:none; padding:10px 20px; border-radius:4px; font-weight:500;">Sprawdź na HS3 Events</a>
+            {% endif %}
+          </td>
+        </tr>
+      </table>
+      {% endfor %}
+    </div>
+    <div style="padding:20px; text-align:center; font-size:14px; color:#777; background:#fafbfd;">
+      <p>Otrzymujesz ten newsletter ponieważ jesteś super cool 1337 osobą subskrybującą info HS3.</p>
+    </div>
+  </div>
+</body>
+</html>