Update lean and merge dark mode changes.

DocGen4/Output.lean

@@ -40,6 +40,7 @@ def htmlOutputSetup (config : SiteBaseContext) : IO Unit := do
   let docGenStatic := #[
     ("style.css", styleCss),
     ("declaration-data.js", declarationDataCenterJs),
+    ("color-scheme.js", colorSchemeJs),
     ("nav.js", navJs),
     ("how-about.js", howAboutJs),
     ("search.html", searchHtml),

DocGen4/Output/Base.lean

@@ -155,6 +155,7 @@ are used in documentation generation, notably JS and CSS ones.
 -/
   def styleCss : String := include_str "../../static/style.css"
   def declarationDataCenterJs : String := include_str "../../static/declaration-data.js"
+  def colorSchemeJs : String := include_str "../../static/color-scheme.js"
   def navJs : String := include_str "../../static/nav.js"
   def howAboutJs : String := include_str "../../static/how-about.js"
   def searchJs : String := include_str "../../static/search.js"

DocGen4/Output/Navbar.lean

@@ -62,6 +62,7 @@ def navbar : BaseHtmlM Html := do
         [← baseHtmlHeadDeclarations]
 
         <script type="module" src={s!"{← getRoot}nav.js"}></script>
+        <script type="module" src={s!"{← getRoot}color-scheme.js"}></script>
         <base target="_parent" />
       </head>
 
@@ -82,6 +83,18 @@ def navbar : BaseHtmlM Html := do
           -/
           <h3>Library</h3>
           {← moduleList}
+          <div id="settings" hidden="hidden">
+            -- `input` is a void tag, but can be self-closed to make parsing easier.
+            <h3>Color scheme</h3>
+            <form id="color-theme-switcher">
+                <label for="color-theme-dark">
+                    <input type="radio" name="color_theme" id="color-theme-dark" value="dark" autocomplete="off"/>dark</label>
+                <label for="color-theme-system" title="Match system theme settings">
+                    <input type="radio" name="color_theme" id="color-theme-system" value="system" autocomplete="off"/>system</label>
+                <label for="color-theme-light">
+                    <input type="radio" name="color_theme" id="color-theme-light" value="light" autocomplete="off"/>light</label>
+            </form>
+          </div>
         </nav>
         </div>
       </body>

DocGen4/Process/Hierarchy.lean

@@ -92,6 +92,7 @@ partial def fromArrayExt (names : Array NameExt) : Hierarchy :=
 def baseDirBlackList : HashSet String :=
   HashSet.fromArray #[
     "404.html",
+    "color-scheme.js",
     "declaration-data.js",
     "declarations",
     "find",

lake-manifest.json

@@ -7,10 +7,16 @@
     "rev": "2cc7cdeef67184f84db6731450e4c2b258c28fe8",
     "name": "CMark",
     "inputRev?": "main"}},
+  {"git":
+   {"url": "https://github.com/EdAyers/ProofWidgets4",
+    "subDir?": null,
+    "rev": "c43db94a8f495dad37829e9d7ad65483d68c86b8",
+    "name": "proofwidgets",
+    "inputRev?": "v0.0.11"}},
   {"git":
    {"url": "https://github.com/leanprover/lake",
     "subDir?": null,
-    "rev": "0d4da61cbfe65f19ac7070c2c9f62f36db529c4c",
+    "rev": "6601a21f624e445f51200e563cf9c549bdebe46c",
     "name": "lake",
     "inputRev?": "master"}},
   {"git":
@@ -22,7 +28,7 @@
   {"git":
    {"url": "https://github.com/leanprover-community/mathlib4.git",
     "subDir?": null,
-    "rev": "47535ddd6cff5cf523b8914a5269639641b9bb54",
+    "rev": "e6dcb5445cacb4f329ab8faa078f746368bc5d3b",
     "name": "mathlib",
     "inputRev?": "master"}},
   {"git":
@@ -52,12 +58,12 @@
   {"git":
    {"url": "https://github.com/leanprover/std4.git",
     "subDir?": null,
-    "rev": "176b4657e21ea6f5a1517c625ee97e89acad0126",
+    "rev": "e68aa8f5fe47aad78987df45f99094afbcb5e936",
     "name": "std4",
     "inputRev?": "main"}},
   {"git":
    {"url": "https://github.com/leanprover/std4",
     "subDir?": null,
-    "rev": "6932c4ea52914dc6b0488944e367459ddc4d01a6",
+    "rev": "e68aa8f5fe47aad78987df45f99094afbcb5e936",
     "name": "std",
     "inputRev?": "main"}}]}

lakefile.lean

@@ -103,6 +103,7 @@ library_facet docs (lib) : FilePath := do
   let staticFiles := #[
     basePath / "style.css",
     basePath / "declaration-data.js",
+    basePath / "color-scheme.js",
     basePath / "nav.js",
     basePath / "how-about.js",
     basePath / "search.js",

lean-toolchain

@@ -1 +1 @@
-leanprover/lean4:nightly-2023-05-31
+leanprover/lean4:nightly-2023-06-10

static/color-scheme.js

@@ -0,0 +1,33 @@
+function getTheme() {
+    return localStorage.getItem("theme") || "system";
+}
+
+function setTheme(themeName) {
+    localStorage.setItem('theme', themeName);
+    if (themeName == "system") {
+        themeName = parent.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
+    }
+    // the navbar is in an iframe, so we need to set this variable in the parent document
+    for (const win of [window, parent]) {
+        win.document.documentElement.setAttribute('data-theme', themeName);
+    }
+}
+
+setTheme(getTheme())
+
+document.addEventListener("DOMContentLoaded", function() {
+    document.querySelectorAll("#color-theme-switcher input").forEach((input) => {
+        if (input.value == getTheme()) {
+            input.checked = true;
+        }
+        input.addEventListener('change', e => setTheme(e.target.value));
+    });
+
+    // also check to see if the user changes their theme settings while the page is loaded.
+    parent.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', event => {
+        setTheme(getTheme());
+    })
+});
+
+// un-hide the colorscheme picker
+document.querySelector("#settings").removeAttribute('hidden');

static/style.css

@@ -6,7 +6,14 @@
 
 body {
     font-family: 'Open Sans', sans-serif;
+    color: var(--text-color);
+    background: var(--body-bg);
 }
+
+a {
+   color: var(--link-color);
+}
+
 h1, h2, h3, h4, h5, h6 {
     font-family: 'Merriweather', serif;
 }
@@ -16,10 +23,128 @@ nav { line-height: normal; }
 
 :root {
     --header-height: 3em;
+    --fragment-offset: calc(var(--header-height) + 1em);
+    --content-width: 55vw;
+
     --header-bg: #f8f8f8;
+    --body-bg: white;
+    --code-bg: #f3f3f3;
+    --text-color: black;
+    --link-color: hsl(210, 100%, 30%);
+
+    --implicit-arg-text-color: var(--text-color);
+
+    --def-color: #92dce5;
+    --def-color-hsl-angle: 187;
+    --theorem-color: #8fe388;
+    --theorem-color-hsl-angle: 115;
+    --axiom-and-constant-color: #f44708;
+    --axiom-and-constant-color-hsl-angle: 16;
+    --structure-and-inductive-color: #f0a202;
+    --structure-and-inductive-color-hsl-angle: 40;
+    --starting-percentage: 100;
+
+    --hamburger-bg-color: #eee;
+    --hamburger-active-color: white;
+    --hamburger-border-color: #ccc;
+
+    --tags-border-color: #555;
+
     --fragment-offset: calc(var(--header-height) + 1em);
     --content-width: 55vw;
 }
+/* automatic dark theme if no javascript */
+@media (prefers-color-scheme: dark) {
+    :root {
+        --header-bg: #111010;
+        --body-bg: #171717;
+        --code-bg: #363333;
+        --text-color: #eee;
+        --link-color: #58a6ff;
+
+        --implicit-arg-text-color: var(--text-color);
+
+        --def-color: #1F497F;
+        --def-color-hsl-angle: 214;
+        --theorem-color: #134E2D;
+        --theorem-color-hsl-angle: 146;
+        --axiom-and-constant-color: #6B1B1A;
+        --axiom-and-constant-color-hsl-angle: 1;
+        --structure-and-inductive-color: #73461C;
+        --structure-and-inductive-color-hsl-angle: 29;
+        --starting-percentage: 30;
+
+        --hamburger-bg-color: #2d2c2c;
+        --hamburger-active-color: black;
+        --hamburger-border-color: #717171;
+
+        --tags-border-color: #AAA;
+    }
+}
+
+[data-theme="light"] {
+    color-scheme: light;
+
+    --header-height: 3em;
+    --fragment-offset: calc(var(--header-height) + 1em);
+    --content-width: 55vw;
+
+    --header-bg: #f8f8f8;
+    --body-bg: white;
+    --code-bg: #f3f3f3;
+    --text-color: black;
+    --link-color: hsl(210, 100%, 30%);
+
+    --implicit-arg-text-color: var(--text-color);
+
+    --def-color: #92dce5;
+    --def-color-hsl-angle: 187;
+    --theorem-color: #8fe388;
+    --theorem-color-hsl-angle: 115;
+    --axiom-and-constant-color: #f44708;
+    --axiom-and-constant-color-hsl-angle: 16;
+    --structure-and-inductive-color: #f0a202;
+    --structure-and-inductive-color-hsl-angle: 40;
+    --starting-percentage: 100;
+
+    --hamburger-bg-color: #eee;
+    --hamburger-active-color: white;
+    --hamburger-border-color: #ccc;
+
+    --tags-border-color: #555;
+
+    --fragment-offset: calc(var(--header-height) + 1em);
+    --content-width: 55vw;
+}
+
+[data-theme="dark"] {
+    color-scheme: dark;
+
+    --header-bg: #111010;
+    --body-bg: #171717;
+    --code-bg: #363333;
+    --text-color: #eee;
+    --link-color: #58a6ff;
+
+    --implicit-arg-text-color: var(--text-color);
+
+    --def-color: #1F497F;
+    --def-color-hsl-angle: 214;
+    --theorem-color: #134E2D;
+    --theorem-color-hsl-angle: 146;
+    --axiom-and-constant-color: #6B1B1A;
+    --axiom-and-constant-color-hsl-angle: 1;
+    --structure-and-inductive-color: #73461C;
+    --structure-and-inductive-color-hsl-angle: 29;
+    --starting-percentage: 30;
+
+    --hamburger-bg-color: #2d2c2c;
+    --hamburger-active-color: black;
+    --hamburger-border-color: #717171;
+
+    --tags-border-color: #AAA;
+}
+
 @supports (width: min(10px, 5vw)) {
     :root {
         --content-width: clamp(20em, 55vw, 60em);
@@ -94,13 +219,13 @@ header {
     label[for="nav_toggle"] {
         display: inline-block;
         margin-right: 1em;
-        border: 1px solid #ccc;
+        border: 1px solid var(--hamburger-border-color);
         padding: 0.5ex 1ex;
         cursor: pointer;
-        background: #eee;
+        background: var(--hamburger-bg-color);
     }
     #nav_toggle:checked ~ * label[for="nav_toggle"] {
-        background: white;
+        background: var(--hamburger-active-color);
     }
 
     body header h1 {
@@ -199,8 +324,8 @@ header header_filename {
 }
 
 #autocomplete_results .selected .result_link a {
-    background: white;
+    background: var(--body-bg);
-    border-color: #f0a202;
+    border-color: var(--structure-and-inductive-color);
 }
 
 
@@ -349,6 +474,44 @@ nav {
     --header-height: 0;
 }
 
+#settings {
+    margin-top: 5em;
+}
+#settings h3 {
+    font-size: inherit;
+}
+
+#color-theme-switcher {
+    display: flex;
+    justify-content: space-between;
+    padding: 0 2ex;
+    flex-flow: row wrap;
+}
+
+/* custom radio buttons for dark/light switch */
+#color-theme-switcher input {
+    -webkit-appearance: none;
+    -moz-appearance: none;
+    appearance: none;
+    display: inline-block;
+    box-sizing: content-box;
+    height: 1em;
+    width: 1em;
+    background-clip: content-box;
+    padding: 2px;
+    border: 2px solid transparent;
+    margin-bottom: -4px;
+    border-radius: 50%;
+}
+#color-theme-dark { background-color: #444; }
+#color-theme-light { background-color: #ccc; }
+#color-theme-system {
+    background-image: linear-gradient(60deg, #444, #444 50%, #CCC 50%, #CCC);
+}
+#color-theme-switcher input:checked {
+    border-color: var(--text-color);
+}
+
 .decl > div, .mod_doc {
     padding-left: 8px;
     padding-right: 8px;
@@ -413,23 +576,23 @@ main h2, main h3, main h4, main h5, main h6 {
 }
 
 .def, .instance {
-    border-left: 10px solid #92dce5;
+    border-left: 10px solid var(--text-color);
-    border-top: 2px solid #92dce5;
+    border-top: 2px solid var(--text-color);
 }
 
 .theorem {
-    border-left: 10px solid #8fe388;
+    border-left: 10px solid var(--theorem-color);
-    border-top: 2px solid #8fe388;
+    border-top: 2px solid var(--theorem-color);
 }
 
 .axiom, .opaque {
-    border-left: 10px solid #f44708;
+    border-left: 10px solid var(--axiom-and-constant-color);
-    border-top: 2px solid #f44708;
+    border-top: 2px solid var(--axiom-and-constant-color);
 }
 
 .structure, .inductive, .class {
-    border-left: 10px solid #f0a202;
+    border-left: 10px solid var(--structure-and-inductive-color);
-    border-top: 2px solid #f0a202;
+    border-top: 2px solid var(--structure-and-inductive-color);
 }
 
 .fn {
@@ -454,23 +617,23 @@ main h2, main h3, main h4, main h5, main h6 {
 }
 
 .def .fn:hover, .instance .fn:hover {
-    background-color: hsla(187, 61%, calc(100% - 5%*var(--fn)));
+    background-color: hsla(var(--def-color-hsl-angle), 61%, calc(var(--starting-percentage) - 5%*var(--fn)));
-    box-shadow: 0 0 0 1px hsla(187, 61%, calc(100% - 5%*(var(--fn) + 1)));
+    box-shadow: 0 0 0 1px hsla(var(--def-color-hsl-angle), 61%, calc(var(--starting-percentage) - 5%*(var(--fn) + 1)));
     border-radius: 5px;
 }
 .theorem .fn:hover {
-    background-color: hsla(115, 62%, calc(100% - 5%*var(--fn)));
+    background-color: hsla(var(--theorem-color-hsl-angle), 62%, calc(var(--starting-percentage) - 5%*var(--fn)));
-    box-shadow: 0 0 0 1px hsla(115, 62%, calc(100% - 5%*(var(--fn) + 1)));
+    box-shadow: 0 0 0 1px hsla(var(--theorem-color-hsl-angle), 62%, calc(var(--starting-percentage) - 5%*(var(--fn) + 1)));
     border-radius: 5px;
 }
 .axiom .fn:hover, .opaque .fn:hover {
-    background-color: hsla(16, 94%, calc(100% - 5%*var(--fn)));
+    background-color: hsla(var(--axiom-and-constant-color-hsl-angle), 94%, calc(var(--starting-percentage) - 5%*var(--fn)));
-    box-shadow: 0 0 0 1px hsla(16, 94%, calc(100% - 5%*(var(--fn) + 1)));
+    box-shadow: 0 0 0 1px hsla(var(--axiom-and-constant-color-hsl-angle), 94%, calc(var(--starting-percentage) - 5%*(var(--fn) + 1)));
     border-radius: 5px;
 }
 .structure .fn:hover, .inductive .fn:hover, .class .fn:hover {
-    background-color: hsla(40, 98%, calc(100% - 5%*var(--fn)));
+    background-color: hsla(var(--structure-and-inductive-color-hsl-angle), 98%, calc(var(--starting-percentage) - 5%*var(--fn)));
-    box-shadow: 0 0 0 1px hsla(40, 98%, calc(100% - 5%*(var(--fn) + 1)));
+    box-shadow: 0 0 0 1px hsla(var(--structure-and-inductive-color-hsl-angle), 98%, calc(var(--starting-percentage) - 5%*(var(--fn) + 1)));
     border-radius: 5px;
 }
 
@@ -479,7 +642,7 @@ main h2, main h3, main h4, main h5, main h6 {
 }
 
 .implicits, .impl_arg {
-    color: black;
+    color: var(--text-color);
     white-space: normal;
 }
 
@@ -515,7 +678,7 @@ pre {
     white-space: break-spaces;
 }
 
-code, pre { background: #f3f3f3; }
+code, pre { background: var(--code-bg); }
 code, pre { border-radius: 5px; }
 code { padding: 1px 3px; }
 pre { padding: 1ex; }
@@ -539,11 +702,13 @@ pre code { padding: 0 0; }
 .inductive_ctor_doc  {
     text-indent: 2ex;
     padding-top: 1ex;
+    font-family: 'Open Sans', sans-serif;
 }
 
 .structure_field_doc {
     text-indent: 0;
     padding-top: 1ex;
+    font-family: 'Open Sans', sans-serif;
 }
 
 .structure_ext_fields {
@@ -572,7 +737,7 @@ pre code { padding: 0 0; }
 
 /** Don't show underline on types, to prevent the ≤ vs < confusion. **/
 a:link, a:visited, a:active {
-    color:hsl(210, 100%, 30%);
+    color:var(--link-color);
     text-decoration: none;
 }
 
@@ -608,7 +773,7 @@ a:hover {
 }
 
 .docfile h2 a {
-    color: black;
+    color: var(--text-color);
 }
 
 .tags {
@@ -621,7 +786,7 @@ a:hover {
 }
 
 .tags li {
-    border: 1px solid #555;
+    border: 1px solid var(--tags-border-color);
     border-radius: 4px;
     list-style-type: none;
     padding: 1px 3px;