From 8efb5b6772282e11e212edf67c8befe22ea8c06f Mon Sep 17 00:00:00 2001
From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
Date: Sat, 9 Jul 2022 15:18:29 +0200
Subject: Add plumbing to update next concert on the frontpage

---
 Makefile               |  5 ++++-
 admin/build-indexes.sh | 15 +++++++++++++++
 admin/update-index.py  | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++
 build-concerts.py      | 12 +-----------
 helpers.py             | 11 +++++++++++
 5 files changed, 82 insertions(+), 12 deletions(-)
 create mode 100755 admin/build-indexes.sh
 create mode 100755 admin/update-index.py

diff --git a/Makefile b/Makefile
index ca01374..05616cd 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,7 @@ scripts_folders = $(call dirnames,$(scripts))
 .PHONY: all clean site
 
 # Maintenance:
-.PHONY: feeds upload
+.PHONY: feeds indexes upload
 
 #################### Recipes.
 
@@ -49,6 +49,9 @@ all: site
 feeds:
 	./admin/feeds/build-feeds.sh $(feeds_src)
 
+indexes:
+	./admin/build-indexes.sh . $(languages)
+
 upload: site
 	./upload.sh $(OUTDIR)
 
diff --git a/admin/build-indexes.sh b/admin/build-indexes.sh
new file mode 100755
index 0000000..9dcbda7
--- /dev/null
+++ b/admin/build-indexes.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -eu
+
+HERE=$(dirname "$0")
+ROOT=${HERE}/..
+
+for directory
+do
+    concert="${directory}"/concerts.in
+    index="${directory}"/index.html
+
+    PYTHONPATH="${ROOT}" \
+    "${HERE}"/update-index.py "${concert}" "${index}"
+done
diff --git a/admin/update-index.py b/admin/update-index.py
new file mode 100755
index 0000000..5946433
--- /dev/null
+++ b/admin/update-index.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+
+from datetime import datetime
+from sys import argv
+
+from helpers import (
+    guess_language,
+    read_concerts,
+    split_concerts,
+    tmplocale,
+)
+
+
+CALENDAR_LAYOUT = {
+    'en': '<span id="month">%B</span><br><span id="day">%d</span>',
+    'fr': '<span id="day">%d</span><br><span id="month">%B</span>',
+}
+
+INDEX_TEMPLATE = '''\
+<main>
+    <a id="next-concert" href="concerts.html#concert-%F">
+      <p>
+        {CALENDAR}
+      </p>
+    </a>
+</main>
+'''
+
+
+def main(concerts_src, index_dst):
+    today = datetime.fromordinal(
+        datetime.today().date().toordinal()
+    )
+    past_concerts, next_concerts = split_concerts(
+        read_concerts(concerts_src), today
+    )
+
+    concert = next_concerts[0] if next_concerts else past_concerts[-1]
+
+    lang = guess_language(concerts_src)
+    template = INDEX_TEMPLATE.format(CALENDAR=CALENDAR_LAYOUT[lang])
+
+    with tmplocale(lang):
+        index = concert.time.strftime(template)
+
+    with open(index_dst, 'w') as index_file:
+        index_file.write(index)
+
+
+if __name__ == '__main__':
+    main(*argv[1:])
diff --git a/build-concerts.py b/build-concerts.py
index 6e99673..ed37864 100755
--- a/build-concerts.py
+++ b/build-concerts.py
@@ -9,6 +9,7 @@ from helpers import (
     guess_language,
     read_concerts,
     relative_path,
+    split_concerts,
     tmplocale,
     touchup_plaintext,
 )
@@ -19,17 +20,6 @@ from helpers import (
 # - canceled => warning
 
 
-def split_concerts(concerts, threshold):
-    cutoff = len(concerts)
-
-    for i, c in enumerate(concerts):
-        if c.time > threshold:
-            cutoff = i
-            break
-
-    return reversed(concerts[:cutoff]), concerts[cutoff:]
-
-
 LOCALIZED_TEXT = {
     'en': {
         'past': 'Past concerts',
diff --git a/helpers.py b/helpers.py
index e3ce938..e5c089f 100644
--- a/helpers.py
+++ b/helpers.py
@@ -135,6 +135,17 @@ def read_concerts(filename):
         return tuple(sorted(concerts, key=attrgetter('time')))
 
 
+def split_concerts(concerts, threshold):
+    cutoff = len(concerts)
+
+    for i, c in enumerate(concerts):
+        if c.time > threshold:
+            cutoff = i
+            break
+
+    return reversed(concerts[:cutoff]), concerts[cutoff:]
+
+
 _TOUCHUPS = (
     (re.compile('([0-9])(st|nd|rd|th|er|ère|nde|ème)'), r'\1<sup>\2</sup>'),
     (re.compile('<(https?://[^ ]+)>'), r'<a href="\1" target="_blank">\1</a>'),
-- 
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