[gnome-shell/uiTweaks2: 8/11] search.js: Apply the bold style in real time

[Rares Visalom <raresvisalom src gnome org>]

commit c279613c154015d38c6f525331c291078609fb05
Author: raresvis <rares visalom gmail com>
Date:   Wed Jun 28 01:01:13 2017 +0300

    search.js: Apply the bold style in real time
    
    The classes extending the SearchResult can now connect
    to the 'terms-changed' signal emitted by the SearchResult
    class. This signal enables each object to update its
    internal description in order to apply the bold style
    onto strings that match the search terms.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749957

 js/ui/search.js |   52 ++++++++++++++++++++++++++++++++++++++++++++--------
 1 files changed, 44 insertions(+), 8 deletions(-)
---
diff --git a/js/ui/search.js b/js/ui/search.js
index 3637fef..09ff9f7 100644
--- a/js/ui/search.js
+++ b/js/ui/search.js
@@ -105,16 +105,35 @@ const ListSearchResult = new Lang.Class({
                              y_align: St.Align.MIDDLE });
         this.actor.label_actor = title;
 
+        this._descriptionLabel =
+                        new St.Label({
+                              style_class: 'list-search-result-description' });
+
         if (this.metaInfo['description']) {
-            let description = new St.Label({
-                                style_class: 'list-search-result-description',
-                                text: this.metaInfo['description'] });
+            this._highlightTerms();
 
-            details.add(description, { x_fill: false,
-                                       y_fill: false,
-                                       x_align: St.Align.START,
-                                       y_align: St.Align.MIDDLE });
+            details.add(this._descriptionLabel, { x_fill: false,
+                                                  y_fill: false,
+                                                  x_align: St.Align.START,
+                                                  y_align: St.Align.MIDDLE });
         }
+
+        this._termsChangedSignal =
+                    this._searchResultsView.connect(
+                                        'terms-changed',
+                                        Lang.bind(this, this._highlightTerms));
+        this.actor.connect('destroy', Lang.bind(this, this._onDestroy));
+    },
+
+    _highlightTerms: function() {
+        if (!this.metaInfo['description'] || !this._descriptionLabel || !this._searchResultsView)
+            return;
+
+        
this._descriptionLabel.clutter_text.set_markup(this._searchResultsView.highlightTerms(this.metaInfo['description']));
+    },
+
+    _onDestroy: function() {
+        this._searchResultsView.disconnect(this._termsChangedSignal);
     }
 });
 
@@ -236,7 +255,6 @@ const SearchResultsBase = new Lang.Class({
 
     updateSearch: function(providerResults, terms, callback) {
         this._terms = terms;
-
         if (providerResults.length == 0) {
             this._clearResultDisplay();
             this.actor.hide();
@@ -426,6 +444,8 @@ const SearchResults = new Lang.Class({
 
         this._providers = [];
 
+        this._searchTermRegex = null;
+
         this._searchSettings = new Gio.Settings({ schema_id: SEARCH_PROVIDERS_SCHEMA });
         this._searchSettings.connect('changed::disabled', Lang.bind(this, this._reloadRemoteProviders));
         this._searchSettings.connect('changed::enabled', Lang.bind(this, this._reloadRemoteProviders));
@@ -545,6 +565,14 @@ const SearchResults = new Lang.Class({
 
         if (this._searchTimeoutId == 0)
             this._searchTimeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT, 150, Lang.bind(this, 
this._onSearchTimeout));
+
+        let escapedSearchTerms = this._terms.map(
+                    (currentTerm, index, array) =>
+                            { return Shell.util_regex_escape(currentTerm) });
+
+        this._searchTermRegex =
+                        new RegExp(`(${escapedSearchTerms.join('|')})`, 'gi');
+        this.emit('terms-changed');
     },
 
     _onPan: function(action) {
@@ -683,8 +711,16 @@ const SearchResults = new Lang.Class({
         } else {
             result.actor.remove_style_pseudo_class('selected');
         }
+    },
+
+    highlightTerms: function(description) {
+        if (!description)
+            return '';
+
+        return description.replace(this._searchTermRegex, '<b>$1</b>');
     }
 });
+Signals.addSignalMethods(SearchResults.prototype);
 
 const ProviderInfo = new Lang.Class({
     Name: 'ProviderInfo',