From 073514fc21c8735dccffd007238e7afaea1abc7c Mon Sep 17 00:00:00 2001
From: Christian Schwarz <me@cschwarz.com>
Date: Sun, 14 Jun 2020 18:24:20 +0200
Subject: [PATCH] docs/publish.sh: only render latest (patch+rc) version for
 each (major,minor) versio.

---
 docs/gen-sphinx-versioning-flags.py | 76 +++++++++++++++++++++++++++++
 docs/publish.sh                     |  5 +-
 2 files changed, 78 insertions(+), 3 deletions(-)
 create mode 100644 docs/gen-sphinx-versioning-flags.py

diff --git a/docs/gen-sphinx-versioning-flags.py b/docs/gen-sphinx-versioning-flags.py
new file mode 100644
index 0000000..a3ac8f4
--- /dev/null
+++ b/docs/gen-sphinx-versioning-flags.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python3
+
+import subprocess
+import re
+
+output = subprocess.run(["git", "tag", "-l"], capture_output=True, check=True, text=True)
+tagRE = re.compile(r"^v(?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(-rc(?P<rc>\d+))?$")
+class Tag:
+    orig: str
+    major: int
+    minor: int
+    patch: int
+    rc: int
+
+    def __str__(self):
+        return self.orig
+
+    def __repr__(self):
+        return self.orig
+
+tags = []
+for line in output.stdout.split("\n"):
+    m = tagRE.match(line)
+    if not m:
+        continue
+    m = m.groupdict()
+
+    t = Tag()
+    t.orig = line
+    t.major = int(m["major"])   
+    t.minor = int(m["minor"])   
+    t.patch = int(m["patch"])
+    t.rc = int(m["rc"] if m["rc"] is not None else 0)
+
+    tags.append(t)
+
+by_major_minor = {}
+
+for tag in tags:
+    key = (tag.major, tag.minor)
+    l = by_major_minor.get(key, [])
+    l.append(tag)
+    by_major_minor[key] = l
+
+latest_by_major_minor = []
+for (mm, l) in by_major_minor.items():
+    # sort ascending by patch-level (rc's weigh less)
+    l.sort(key=lambda tag: (tag.patch, int(tag.rc == 0), tag.rc))
+    latest_by_major_minor.append(l[-1])
+latest_by_major_minor.sort(key=lambda tag: (tag.major, tag.minor))
+
+# print(by_major_minor)
+# print(latest_by_major_minor)
+
+cmdline = []
+
+for latest_patch in latest_by_major_minor:
+    cmdline.append("--whitelist-tags")
+    cmdline.append(f"^{re.escape(latest_patch.orig)}$")
+
+# we want to render the latest non-rc version as the default page
+# (latest_by_major_minor is already sorted)
+default_version = latest_by_major_minor[-1]
+for tag in reversed(latest_by_major_minor):
+    if tag.rc == 0:
+        default_version = tag
+        break
+
+cmdline.extend(["--root-ref", f"{default_version}"])
+cmdline.extend(["--banner-main-ref", f"{default_version}"])
+cmdline.extend(["--show-banner"])
+cmdline.extend(["--sort", "semver"])
+
+cmdline.extend(["--whitelist-branches", "master"])
+
+print(" ".join(cmdline))
\ No newline at end of file
diff --git a/docs/publish.sh b/docs/publish.sh
index 57be197..1915864 100755
--- a/docs/publish.sh
+++ b/docs/publish.sh
@@ -51,11 +51,10 @@ git rm -rf .
 popd
 
 echo "building site"
+
 set -e
 sphinx-versioning build \
-   --show-banner \
-   --whitelist-branches '^master$' \
-   --whitelist-tags '(v)?\d+\.[1-9][0-9]*.\d+$' \
+   $(python3 gen-sphinx-versioning-flags.py) \
    docs ./public_git \
    -- -c sphinxconf # older conf.py throw errors because they used
                     # version = subprocess.show_output(["git", "describe"])