Implement new shortcuts:

- "/" for Focus search bar
- "ESC" - clear highlighted text

Fixes #691.

Co-authored-by: Jakob Lykke Andersen <jakobandersen@users.noreply.github.com>

Author: marxin

CHANGES

@@ -49,6 +49,9 @@ Features added
   references for readability with standalone readers
 * #9822 (and #9062), add new Intersphinx role :rst:role:`external` for explict
   lookup in the external projects, without resolving to the local project.
+* #9337: HTML theme, add option ``enable_search_shortcuts`` that enables :kbd:'/' as
+         a Quick search shortcut and :kbd:`Esc` shortcut that
+         removes search highlighting.
 
 Bugs fixed
 ----------

doc/usage/theming.rst

@@ -158,9 +158,18 @@ These themes are:
     dimension string such as '70em' or '50%'. Use 'none' if you don't
     want a width limit. Defaults may depend on the theme (often 800px).
 
-  - **navigation_with_keys** (true or false): Allow navigating to the
-    previous/next page using the keyboard's left and right arrows.  Defaults to
-    ``False``.
+  - **navigation_with_keys** (true or false): Allow navigating
+    with the following keyboard shortcuts:
+
+    - :kbd:`Left arrow`: previous page
+    - :kbd:`Right arrow`: next page
+
+    Defaults to ``False``.
+
+  - **enable_search_shortcuts** (true or false): Allow jumping to the search box
+    with :kbd:`/` and allow removal of search highlighting with :kbd:`Esc`.
+
+    Defaults to ``True``.
 
   - **globaltoc_collapse** (true or false): Only expand subsections
     of the current document in ``globaltoc.html``

sphinx/themes/basic/static/doctools.js

@@ -154,9 +154,7 @@ var Documentation = {
     this.fixFirefoxAnchorBug();
     this.highlightSearchWords();
     this.initIndexTable();
-    if (DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS) {
-      this.initOnKeyListeners();
-    }
+    this.initOnKeyListeners();
   },
 
   /**
@@ -269,6 +267,13 @@ var Documentation = {
     window.history.replaceState({}, '', url);
   },
 
+   /**
+   * helper function to focus on search bar
+   */
+  focusSearchBar : function() {
+    $('input[name=q]').first().focus();
+  },
+
   /**
    * make the url absolute
    */
@@ -291,27 +296,54 @@ var Documentation = {
   },
 
   initOnKeyListeners: function() {
+    // only install a listener if it is really needed
+    if (!DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS &&
+        !DOCUMENTATION_OPTIONS.ENABLE_SEARCH_SHORTCUTS)
+        return;
+
     $(document).keydown(function(event) {
       var activeElementType = document.activeElement.tagName;
       // don't navigate when in search box, textarea, dropdown or button
       if (activeElementType !== 'TEXTAREA' && activeElementType !== 'INPUT' && activeElementType !== 'SELECT'
-          && activeElementType !== 'BUTTON' && !event.altKey && !event.ctrlKey && !event.metaKey
-          && !event.shiftKey) {
-        switch (event.keyCode) {
-          case 37: // left
-            var prevHref = $('link[rel="prev"]').prop('href');
-            if (prevHref) {
-              window.location.href = prevHref;
-              return false;
-            }
-            break;
-          case 39: // right
-            var nextHref = $('link[rel="next"]').prop('href');
-            if (nextHref) {
-              window.location.href = nextHref;
-              return false;
-            }
-            break;
+          && activeElementType !== 'BUTTON') {
+        if (event.altKey || event.ctrlKey || event.metaKey)
+          return;
+
+          if (!event.shiftKey) {
+            switch (event.key) {
+              case 'ArrowLeft':
+                if (!DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS)
+                  break;
+                var prevHref = $('link[rel="prev"]').prop('href');
+                if (prevHref) {
+                  window.location.href = prevHref;
+                  return false;
+                }
+                break;
+              case 'ArrowRight':
+                if (!DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS)
+                  break;
+                var nextHref = $('link[rel="next"]').prop('href');
+                if (nextHref) {
+                  window.location.href = nextHref;
+                  return false;
+                }
+                break;
+              case 'Escape':
+                if (!DOCUMENTATION_OPTIONS.ENABLE_SEARCH_SHORTCUTS)
+                  break;
+                Documentation.hideSearchWords();
+                return false;
+          }
+        }
+
+        // some keyboard layouts may need Shift to get /
+        switch (event.key) {
+          case '/':
+            if (!DOCUMENTATION_OPTIONS.ENABLE_SEARCH_SHORTCUTS)
+              break;
+            Documentation.focusSearchBar();
+            return false;
         }
       }
     });

sphinx/themes/basic/static/documentation_options.js_t

@@ -8,5 +8,6 @@ var DOCUMENTATION_OPTIONS = {
     LINK_SUFFIX: '{{ link_suffix }}',
     HAS_SOURCE: {{ has_source|lower }},
     SOURCELINK_SUFFIX: '{{ sourcelink_suffix }}',
-    NAVIGATION_WITH_KEYS: {{ 'true' if theme_navigation_with_keys|tobool else 'false'}}
+    NAVIGATION_WITH_KEYS: {{ 'true' if theme_navigation_with_keys|tobool else 'false'}},
+    ENABLE_SEARCH_SHORTCUTS: {{ 'true' if enable_search_shortcuts|tobool else 'true'}},
 };

sphinx/themes/basic/theme.conf

@@ -10,6 +10,7 @@ sidebarwidth = 230
 body_min_width = 450
 body_max_width = 800
 navigation_with_keys = False
+enable_search_shortcuts = True
 globaltoc_collapse = true
 globaltoc_includehidden = false
 globaltoc_maxdepth =