DEV: Add special *in* items on the advanced search using the API

app/assets/javascripts/discourse/app/components/search-advanced-options.hbs

@@ -67,9 +67,9 @@
     <div class="control-group advanced-search-topics-posts">
       <div class="controls">
         <fieldset class="grouped-control">
-          <legend class="grouped-control-label">{{i18n
-              "search.advanced.filters.label"
-            }}</legend>
+          <legend class="grouped-control-label">
+            {{i18n "search.advanced.filters.label"}}
+          </legend>
 
           {{#if this.currentUser}}
             <div class="grouped-control-field">
@@ -146,6 +146,27 @@
             </div>
           {{/if}}
 
+          {{#each this.inSpecialOptions as |option|}}
+            <div class="grouped-control-field">
+              <Input
+                id={{concat "matching-in-" option.value}}
+                @type="checkbox"
+                class={{concat "in-" option.value}}
+                @checked={{get this.searchedTerms.special.in option.value}}
+                {{on
+                  "click"
+                  (fn this.onChangeSearchTermForSpecialIn option.value)
+                }}
+              />
+              <label
+                class="checkbox-label"
+                for={{concat "matching-in-" option.value}}
+              >
+                {{option.name}}
+              </label>
+            </div>
+          {{/each}}
+
           <ComboBox
             @id="in"
             @valueProperty="value"

app/assets/javascripts/discourse/app/components/search-advanced-options.js

@@ -2,6 +2,7 @@ import Component from "@ember/component";
 import { action } from "@ember/object";
 import { escapeExpression } from "discourse/lib/utilities";
 import Category from "discourse/models/category";
+import escapeRegExp from "discourse-common/utils/escape-regexp";
 import I18n from "discourse-i18n";
 
 const REGEXP_BLOCKS = /(([^" \t\n\x0B\f\r]+)?(("[^"]+")?))/g;
@@ -88,6 +89,13 @@ export default Component.extend({
   init() {
     this._super(...arguments);
 
+    const allInOptions = this.currentUser
+      ? inOptionsForUsers().concat(inOptionsForAll())
+      : inOptionsForAll();
+
+    const inOptions = allInOptions.filter((option) => !option.special);
+    const inSpecialOptions = allInOptions.filter((option) => option.special);
+
     this.setProperties({
       searchedTerms: {
         username: null,
@@ -113,9 +121,8 @@ export default Component.extend({
           days: null,
         },
       },
-      inOptions: this.currentUser
-        ? inOptionsForUsers().concat(inOptionsForAll())
-        : inOptionsForAll(),
+      inOptions,
+      inSpecialOptions,
       statusOptions: statusOptions(),
       postTimeOptions: postTimeOptions(),
       showAllTagsCheckbox: false,
@@ -158,6 +165,13 @@ export default Component.extend({
       REGEXP_SPECIAL_IN_SEEN_MATCH
     );
 
+    this.inSpecialOptions.forEach((option) =>
+      this.setSearchedTermSpecialInValue(
+        `searchedTerms.special.in.${option.value}`,
+        new RegExp(`^in:${escapeRegExp(option.value)}$`, "gi")
+      )
+    );
+
     let regExpStatusMatch = this.statusOptions
       .map((status) => status.value)
       .join("|");
@@ -477,6 +491,12 @@ export default Component.extend({
     this.updateInRegex(REGEXP_SPECIAL_IN_TITLE_MATCH, "title");
   },
 
+  @action
+  onChangeSearchTermForSpecialIn(name, evt) {
+    this.set("searchedTerms.special.in." + name, evt.target.checked);
+    this.updateInRegex(new RegExp(`^in:${escapeRegExp(name)}$`, "gi"), name);
+  },
+
   @action
   onChangeSearchedTermField(path, updateFnName, value) {
     this.set(`searchedTerms.${path}`, value);