From 9c90c98704256517401688d5cb74aa89ec2d00ab Mon Sep 17 00:00:00 2001
From: Amjad Ben Hedhili <amjadhedhili@outlook.com>
Date: Sun, 21 Aug 2022 21:56:12 +0100
Subject: [PATCH] Docs auto dark mode (#20188)

* Implement auto dark mode

* Rename class

* Fix borders cutout

* Apply suggestions from code review

* Apply suggestions from code review

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
---
 config/nimdoc.cfg                             | 26 ++---
 doc/nimdoc.css                                | 96 ++++++++-----------
 nimdoc/rst2html/expected/rst_examples.html    | 13 +--
 .../expected/index.html                       | 13 +--
 nimdoc/testproject/expected/nimdoc.out.css    | 96 ++++++++-----------
 .../expected/subdir/subdir_b/utils.html       | 13 +--
 nimdoc/testproject/expected/testproject.html  | 13 +--
 tools/dochack/dochack.nim                     | 40 +++-----
 8 files changed, 136 insertions(+), 174 deletions(-)

diff --git a/config/nimdoc.cfg b/config/nimdoc.cfg
index 7aee50d8c5253..d10c2f3186fe1 100644
--- a/config/nimdoc.cfg
+++ b/config/nimdoc.cfg
@@ -135,12 +135,13 @@ doc.body_toc_groupsection = """
 doc.body_toc_group = """
 <div class="row">
   <div class="three columns">
-    <div class="theme-switch-wrapper">
-      <label class="theme-switch" for="checkbox">
-        <input type="checkbox" id="checkbox" />
-        <div class="slider round"></div>
-      </label>
-      &nbsp;&nbsp;&nbsp; <em>Dark Mode</em>
+    <div class="theme-select-wrapper">
+      <label for="theme-select">Theme:&nbsp;</label>
+      <select id="theme-select" onchange="setTheme(this.value)">
+        <option value="auto">🌗 Match OS</option>
+        <option value="dark">🌑 Dark</option>
+        <option value="light">🌕 Light</option>
+      </select>
     </div>
     <div id="global-links">
       <ul class="simple-boot">
@@ -174,12 +175,13 @@ doc.body_toc_group = """
 doc.body_toc_group = """
 <div class="row">
   <div class="three columns">
-    <div class="theme-switch-wrapper">
-      <label class="theme-switch" for="checkbox">
-        <input type="checkbox" id="checkbox" />
-        <div class="slider round"></div>
-      </label>
-      &nbsp;&nbsp;&nbsp; <em>Dark Mode</em>
+    <div class="theme-select-wrapper">
+      <label for="theme-select">Theme:&nbsp;</label>
+      <select id="theme-select" onchange="setTheme(this.value)">
+        <option value="auto">🌗 Match OS</option>
+        <option value="dark">🌑 Dark</option>
+        <option value="light">🌕 Light</option>
+      </select>
     </div>
     <div id="global-links">
       <ul class="simple">
diff --git a/doc/nimdoc.css b/doc/nimdoc.css
index e72c4a213c971..f924f5a36f711 100644
--- a/doc/nimdoc.css
+++ b/doc/nimdoc.css
@@ -78,63 +78,45 @@ Modified by Boyd Greenfield and narimiran
   --clipboard-image: var(--clipboard-image-normal);
 }
 
-.theme-switch-wrapper {
-  display: flex;
-  align-items: center;
-}
-
-.theme-switch-wrapper em {
-  margin-left: 10px;
-  font-size: 1rem;
-}
-
-.theme-switch {
-  display: inline-block;
-  height: 22px;
-  position: relative;
-  width: 50px;
-}
-
-.theme-switch input {
-  display: none;
-}
-
-.slider {
-  background-color: #ccc;
-  bottom: 0;
-  cursor: pointer;
-  left: 0;
-  position: absolute;
-  right: 0;
-  top: 0;
-  transition: .4s;
-}
-
-.slider:before {
-  background-color: #fff;
-  bottom: 4px;
-  content: "";
-  height: 13px;
-  left: 4px;
-  position: absolute;
-  transition: .4s;
-  width: 13px;
-}
-
-input:checked + .slider {
-  background-color: #66bb6a;
-}
-
-input:checked + .slider:before {
-  transform: translateX(26px);
-}
-
-.slider.round {
-  border-radius: 17px;
+@media (prefers-color-scheme: dark) {
+  [data-theme="auto"] {
+    --primary-background: #171921;
+    --secondary-background: #1e202a;
+    --third-background: #2b2e3b;
+    --info-background: #008000;
+    --warning-background: #807000;
+    --error-background: #c03000;
+    --border: #0e1014;
+    --text: #fff;
+    --anchor: #8be9fd;
+    --anchor-focus: #8be9fd;
+    --input-focus: #8be9fd;
+    --strong: #bd93f9;
+    --hint: #7A7C85;
+    --nim-sprite-base64: url("data:image/png;base64,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");
+
+    --keyword: #ff79c6;
+    --identifier: #f8f8f2;
+    --comment: #6272a4;
+    --operator: #ff79c6;
+    --punctuation: #f8f8f2;
+    --other: #f8f8f2;
+    --escapeSequence: #bd93f9;
+    --number: #bd93f9;
+    --literal: #f1fa8c;
+    --program: #9090c0;
+    --option: #90b010;
+    --raw-data: #8be9fd;
+
+    --clipboard-image-normal: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' style='color: lightgray' fill='none' viewBox='0 0 24 24' stroke='currentColor'%3E %3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2' /%3E %3C/svg%3E");
+    --clipboard-image-selected: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' style='color: lightgray' viewBox='0 0 20 20' fill='currentColor'%3E %3Cpath d='M8 3a1 1 0 011-1h2a1 1 0 110 2H9a1 1 0 01-1-1z' /%3E %3Cpath d='M6 3a2 2 0 00-2 2v11a2 2 0 002 2h8a2 2 0 002-2V5a2 2 0 00-2-2 3 3 0 01-3 3H9a3 3 0 01-3-3z' /%3E %3C/svg%3E");
+    --clipboard-image: var(--clipboard-image-normal);
+  }
 }
 
-.slider.round:before {
-  border-radius: 50%;
+.theme-select-wrapper {
+  display: flex;
+  align-items: center;
 }
 
 html {
@@ -176,7 +158,9 @@ body {
   height: 100vh;
   position: sticky;
   top: 0px;
-  overflow-y: auto; }
+  overflow-y: auto;
+  padding: 2px;
+}
 
 .nine.columns {
   width: 75.0%;
diff --git a/nimdoc/rst2html/expected/rst_examples.html b/nimdoc/rst2html/expected/rst_examples.html
index efc8ac414f895..9debd16ac021f 100644
--- a/nimdoc/rst2html/expected/rst_examples.html
+++ b/nimdoc/rst2html/expected/rst_examples.html
@@ -27,12 +27,13 @@
       <h1 class="title">Not a Nim Manual</h1>
       <div class="row">
   <div class="three columns">
-    <div class="theme-switch-wrapper">
-      <label class="theme-switch" for="checkbox">
-        <input type="checkbox" id="checkbox" />
-        <div class="slider round"></div>
-      </label>
-      &nbsp;&nbsp;&nbsp; <em>Dark Mode</em>
+    <div class="theme-select-wrapper">
+      <label for="theme-select">Theme:&nbsp;</label>
+      <select id="theme-select" onchange="setTheme(this.value)">
+        <option value="auto">🌗 Match OS</option>
+        <option value="dark">🌑 Dark</option>
+        <option value="light">🌕 Light</option>
+      </select>
     </div>
     <div id="global-links">
       <ul class="simple">
diff --git a/nimdoc/test_out_index_dot_html/expected/index.html b/nimdoc/test_out_index_dot_html/expected/index.html
index d97f7092a6489..50a18bdae9b3a 100644
--- a/nimdoc/test_out_index_dot_html/expected/index.html
+++ b/nimdoc/test_out_index_dot_html/expected/index.html
@@ -27,12 +27,13 @@
       <h1 class="title">nimdoc/test_out_index_dot_html/foo</h1>
       <div class="row">
   <div class="three columns">
-    <div class="theme-switch-wrapper">
-      <label class="theme-switch" for="checkbox">
-        <input type="checkbox" id="checkbox" />
-        <div class="slider round"></div>
-      </label>
-      &nbsp;&nbsp;&nbsp; <em>Dark Mode</em>
+    <div class="theme-select-wrapper">
+      <label for="theme-select">Theme:&nbsp;</label>
+      <select id="theme-select" onchange="setTheme(this.value)">
+        <option value="auto">🌗 Match OS</option>
+        <option value="dark">🌑 Dark</option>
+        <option value="light">🌕 Light</option>
+      </select>
     </div>
     <div id="global-links">
       <ul class="simple">
diff --git a/nimdoc/testproject/expected/nimdoc.out.css b/nimdoc/testproject/expected/nimdoc.out.css
index e72c4a213c971..f924f5a36f711 100644
--- a/nimdoc/testproject/expected/nimdoc.out.css
+++ b/nimdoc/testproject/expected/nimdoc.out.css
@@ -78,63 +78,45 @@ Modified by Boyd Greenfield and narimiran
   --clipboard-image: var(--clipboard-image-normal);
 }
 
-.theme-switch-wrapper {
-  display: flex;
-  align-items: center;
-}
-
-.theme-switch-wrapper em {
-  margin-left: 10px;
-  font-size: 1rem;
-}
-
-.theme-switch {
-  display: inline-block;
-  height: 22px;
-  position: relative;
-  width: 50px;
-}
-
-.theme-switch input {
-  display: none;
-}
-
-.slider {
-  background-color: #ccc;
-  bottom: 0;
-  cursor: pointer;
-  left: 0;
-  position: absolute;
-  right: 0;
-  top: 0;
-  transition: .4s;
-}
-
-.slider:before {
-  background-color: #fff;
-  bottom: 4px;
-  content: "";
-  height: 13px;
-  left: 4px;
-  position: absolute;
-  transition: .4s;
-  width: 13px;
-}
-
-input:checked + .slider {
-  background-color: #66bb6a;
-}
-
-input:checked + .slider:before {
-  transform: translateX(26px);
-}
-
-.slider.round {
-  border-radius: 17px;
+@media (prefers-color-scheme: dark) {
+  [data-theme="auto"] {
+    --primary-background: #171921;
+    --secondary-background: #1e202a;
+    --third-background: #2b2e3b;
+    --info-background: #008000;
+    --warning-background: #807000;
+    --error-background: #c03000;
+    --border: #0e1014;
+    --text: #fff;
+    --anchor: #8be9fd;
+    --anchor-focus: #8be9fd;
+    --input-focus: #8be9fd;
+    --strong: #bd93f9;
+    --hint: #7A7C85;
+    --nim-sprite-base64: 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");
+
+    --keyword: #ff79c6;
+    --identifier: #f8f8f2;
+    --comment: #6272a4;
+    --operator: #ff79c6;
+    --punctuation: #f8f8f2;
+    --other: #f8f8f2;
+    --escapeSequence: #bd93f9;
+    --number: #bd93f9;
+    --literal: #f1fa8c;
+    --program: #9090c0;
+    --option: #90b010;
+    --raw-data: #8be9fd;
+
+    --clipboard-image-normal: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' style='color: lightgray' fill='none' viewBox='0 0 24 24' stroke='currentColor'%3E %3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2' /%3E %3C/svg%3E");
+    --clipboard-image-selected: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' style='color: lightgray' viewBox='0 0 20 20' fill='currentColor'%3E %3Cpath d='M8 3a1 1 0 011-1h2a1 1 0 110 2H9a1 1 0 01-1-1z' /%3E %3Cpath d='M6 3a2 2 0 00-2 2v11a2 2 0 002 2h8a2 2 0 002-2V5a2 2 0 00-2-2 3 3 0 01-3 3H9a3 3 0 01-3-3z' /%3E %3C/svg%3E");
+    --clipboard-image: var(--clipboard-image-normal);
+  }
 }
 
-.slider.round:before {
-  border-radius: 50%;
+.theme-select-wrapper {
+  display: flex;
+  align-items: center;
 }
 
 html {
@@ -176,7 +158,9 @@ body {
   height: 100vh;
   position: sticky;
   top: 0px;
-  overflow-y: auto; }
+  overflow-y: auto;
+  padding: 2px;
+}
 
 .nine.columns {
   width: 75.0%;
diff --git a/nimdoc/testproject/expected/subdir/subdir_b/utils.html b/nimdoc/testproject/expected/subdir/subdir_b/utils.html
index c42f185905f84..b3d52c4f5daf1 100644
--- a/nimdoc/testproject/expected/subdir/subdir_b/utils.html
+++ b/nimdoc/testproject/expected/subdir/subdir_b/utils.html
@@ -27,12 +27,13 @@
       <h1 class="title">subdir/subdir_b/utils</h1>
       <div class="row">
   <div class="three columns">
-    <div class="theme-switch-wrapper">
-      <label class="theme-switch" for="checkbox">
-        <input type="checkbox" id="checkbox" />
-        <div class="slider round"></div>
-      </label>
-      &nbsp;&nbsp;&nbsp; <em>Dark Mode</em>
+    <div class="theme-select-wrapper">
+      <label for="theme-select">Theme:&nbsp;</label>
+      <select id="theme-select" onchange="setTheme(this.value)">
+        <option value="auto">🌗 Match OS</option>
+        <option value="dark">🌑 Dark</option>
+        <option value="light">🌕 Light</option>
+      </select>
     </div>
     <div id="global-links">
       <ul class="simple">
diff --git a/nimdoc/testproject/expected/testproject.html b/nimdoc/testproject/expected/testproject.html
index e18625222e133..ea0269710e033 100644
--- a/nimdoc/testproject/expected/testproject.html
+++ b/nimdoc/testproject/expected/testproject.html
@@ -27,12 +27,13 @@
       <h1 class="title">testproject</h1>
       <div class="row">
   <div class="three columns">
-    <div class="theme-switch-wrapper">
-      <label class="theme-switch" for="checkbox">
-        <input type="checkbox" id="checkbox" />
-        <div class="slider round"></div>
-      </label>
-      &nbsp;&nbsp;&nbsp; <em>Dark Mode</em>
+    <div class="theme-select-wrapper">
+      <label for="theme-select">Theme:&nbsp;</label>
+      <select id="theme-select" onchange="setTheme(this.value)">
+        <option value="auto">🌗 Match OS</option>
+        <option value="dark">🌑 Dark</option>
+        <option value="light">🌕 Light</option>
+      </select>
     </div>
     <div id="global-links">
       <ul class="simple">
diff --git a/tools/dochack/dochack.nim b/tools/dochack/dochack.nim
index c7b8232efbccb..5ba42e9c116f5 100644
--- a/tools/dochack/dochack.nim
+++ b/tools/dochack/dochack.nim
@@ -2,16 +2,19 @@ import dom
 import fuzzysearch
 
 
-proc switchTheme(event: Event) =
-  if event.target.checked:
-    document.documentElement.setAttribute("data-theme", "dark")
-    window.localStorage.setItem("theme", "dark")
-  else:
-    document.documentElement.setAttribute("data-theme", "light")
-    window.localStorage.setItem("theme", "light")
+proc setTheme(theme: cstring) {.exportc.} =
+  document.documentElement.setAttribute("data-theme", theme)
+  window.localStorage.setItem("theme", theme)
+
+# set `data-theme` attribute early to prevent white flash
+setTheme:
+  let t = window.localStorage.getItem("theme")
+  if t.isNil: cstring"auto" else: t
 
+proc onDOMLoaded(e: Event) {.exportc.} =
+  # set theme select value
+  document.getElementById("theme-select").value = window.localStorage.getItem("theme")
 
-proc nimThemeSwitch(event: Event) {.exportC.} =
   var pragmaDots = document.getElementsByClassName("pragmadots")
   for i in 0..<pragmaDots.len:
     pragmaDots[i].onclick = proc (event: Event) =
@@ -20,25 +23,10 @@ proc nimThemeSwitch(event: Event) {.exportC.} =
       # Show actual
       event.target.parentNode.nextSibling.style.display = "inline"
 
-  let toggleSwitch = document.querySelector(".theme-switch input[type=\"checkbox\"]")
-
-  if toggleSwitch != nil:
-    toggleSwitch.addEventListener("change", switchTheme, false)
-
-  var currentTheme = window.localStorage.getItem("theme")
-  if currentTheme.len == 0 and window.matchMedia("(prefers-color-scheme: dark)").matches:
-    currentTheme = "dark"
-  if currentTheme.len > 0:
-    document.documentElement.setAttribute("data-theme", currentTheme);
-
-    if currentTheme == "dark" and toggleSwitch != nil:
-      toggleSwitch.checked = true
 
-proc textContent(e: Element): cstring {.
-  importcpp: "#.textContent", nodecl.}
+proc textContent(e: Element): cstring {.importcpp: "#.textContent", nodecl.}
 
-proc textContent(e: Node): cstring {.
-  importcpp: "#.textContent", nodecl.}
+proc textContent(e: Node): cstring {.importcpp: "#.textContent", nodecl.}
 
 proc tree(tag: string; kids: varargs[Element]): Element =
   result = document.createElement tag
@@ -431,4 +419,4 @@ proc copyToClipboard*() {.exportc.} =
     .}
 
 copyToClipboard()
-window.addEventListener("DOMContentLoaded", nimThemeSwitch)
\ No newline at end of file
+window.addEventListener("DOMContentLoaded", onDOMLoaded)