Fix documentation version selector

.github/workflows/pages.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches:
       - devel-2.0
-      - master
   workflow_dispatch:
 
 permissions:
@@ -20,17 +19,25 @@ jobs:
   build:
     name: Build documentation
     runs-on: ubuntu-latest
+    env:
+      BLEND_DOC_VERSIONS: '[["devel-2.0","https://bioye97.github.io/blend/"],["2.0.0","https://bioye97.github.io/blend/2.0.0/"]]'
     steps:
-      - name: Checkout
+      - name: Checkout BLEND development source
         uses: actions/checkout@v6
+        with:
+          ref: devel-2.0
+
+      - name: Checkout BLEND 2.0.0 source
+        uses: actions/checkout@v6
+        with:
+          repository: Bioye97/blend
+          ref: v2.0.0
+          path: _versions/blend-2.0.0
 
-      - name: Define documentation versions
+      - name: Add version selector support to BLEND 2.0.0
         run: |
-          {
-            echo 'BLEND_DOC_VERSIONS<<EOF'
-            echo '[["devel-2.0","https://bioye97.github.io/blend/"],["2.0.0","https://bioye97.github.io/blend/2.0.0/"]]'
-            echo 'EOF'
-          } >> "${GITHUB_ENV}"
+          cp doc/rst/source/conf.py _versions/blend-2.0.0/doc/rst/source/conf.py
+          cp doc/rst/source/_static/blend.js _versions/blend-2.0.0/doc/rst/source/_static/blend.js
 
       - name: Set up Python
         uses: actions/setup-python@v6
@@ -67,7 +74,7 @@ jobs:
 
       - name: Configure 2.0.0 documentation
         run: |
-          cmake -S . -B build-2.0.0 \
+          cmake -S _versions/blend-2.0.0 -B build-2.0.0 \
             -DBLEND_BUILD_DOCS=ON \
             -DBLEND_BUILD_EXAMPLES=OFF \
             -DBLEND_BUILD_TESTS=OFF \

doc/rst/source/_static/blend.js

@@ -7,9 +7,36 @@
 
     for (i = 0; i < selects.length; i++) {
       selects[i].addEventListener("change", function () {
-        if (this.value) {
-          window.location.href = this.value;
+        var base;
+        var candidate;
+        var currentBase = null;
+        var j;
+        var relativePath;
+        var target;
+
+        if (!this.value) {
+          return;
+        }
+
+        for (j = 0; j < this.options.length; j++) {
+          candidate = new URL(this.options[j].value, window.location.href);
+          if (candidate.origin === window.location.origin &&
+              window.location.pathname.indexOf(candidate.pathname) === 0 &&
+              (!currentBase || candidate.pathname.length > currentBase.pathname.length)) {
+            currentBase = candidate;
+          }
         }
+
+        target = new URL(this.value, window.location.href);
+        if (currentBase) {
+          base = currentBase.pathname;
+          relativePath = window.location.pathname.substring(base.length);
+          target = new URL(relativePath, target);
+          target.search = window.location.search;
+          target.hash = window.location.hash;
+        }
+
+        window.location.href = target.href;
       });
     }
   });