Run iCal creation as post-processing and link on index

.gitlab-ci.yml

@@ -63,17 +63,23 @@ run_pre_commit_hooks:
     expire_in: 20min
 
 preview:
-  <<: *build
+  extends: .build
+  variables:
+    DEPLOY_URL: https://$CI_PROJECT_NAMESPACE.$CI_PAGES_DOMAIN/-/$CI_PROJECT_NAME/-/jobs/$CI_JOB_ID/artifacts/public
+    ICAL_URL: webcal://$CI_PROJECT_NAMESPACE.$CI_PAGES_DOMAIN/-/$CI_PROJECT_NAME/-/jobs/$CI_JOB_ID/artifacts/public/lectures.ics
   environment:
     name: review/$CI_COMMIT_REF_NAME
-    url: https://$CI_PROJECT_NAMESPACE.$CI_PAGES_DOMAIN/-/$CI_PROJECT_NAME/-/jobs/$CI_JOB_ID/artifacts/public/index.html
+    url: $DEPLOY_URL/index.html
   rules:
     - if: $CI_COMMIT_BRANCH != $CI_DEFAULT_BRANCH
 
 pages:
-  <<: *build
+  extends: .build
+  variables:
+    DEPLOY_URL: https://$CI_PROJECT_NAMESPACE.$CI_PAGES_DOMAIN/$CI_PROJECT_NAME
+    ICAL_URL: webcal://$CI_PROJECT_NAMESPACE.$CI_PAGES_DOMAIN/$CI_PROJECT_NAME/lectures.ics
   environment:
     name: production
-    url: https://$CI_PROJECT_NAMESPACE.$CI_PAGES_DOMAIN/$CI_PROJECT_NAME
+    url: $DEPLOY_URL
   rules:
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

_quarto.yml

 project:
   type: website
   pre-render: scripts/prepare.py
+  post-render: scripts/md2ical.py
   output-dir: public
 
 website:

index.qmd

@@ -27,3 +27,5 @@ If not, don't worry, the lecture will be in a computer room.
 | 2024-06-25 | File & Data systems    | Flo, Kalle |
 | 2024-07-02 | Memory hierarchies | Domink, JFE |
 | 2024-07-09 | Student talks for improving grades  |(tbd)|
+
+Subscribe to [iCal]({{< env ICAL_URL >}})

scripts/md2ical.py

 #!/usr/bin/env python3
 import argparse
+import os
+import pathlib
 
 import markdown2
 from bs4 import BeautifulSoup
@@ -38,8 +40,13 @@ def main():
         prog="md2ical",
         description="Convert a Markdown calendar table to an iCal calendar.",
     )
-    parser.add_argument("-f", "--filename", required=True)
-    parser.add_argument("-o", "--output", required=True)
+    parser.add_argument("-f", "--filename", default="index.qmd")
+    parser.add_argument(
+        "-o",
+        "--output",
+        default=pathlib.Path(os.environ.get("QUARTO_PROJECT_OUTPUT_DIR", ""))
+        / "lectures.ics",
+    )
 
     args = parser.parse_args()