search_suggestion: Use person matching function from people.js.

Instead of having a custom (duplicate) matching function in
search suggestion, it was refactored to use the function in
people.js. This also gets the diacritic-ignoring feature
of the function in people.js.

Fixes #5315.

frontend_tests/node_tests/search_suggestion.js

@@ -622,10 +622,8 @@ init();
 }());
 
 (function test_stream_completion() {
-    var query = 'stream:of';
-
     global.stream_data.subscribed_streams = function () {
-        return ['office'];
+        return ['office', 'dev help'];
     };
 
     global.narrow_state.stream = function () {
@@ -634,13 +632,20 @@ init();
 
     global.stream_data.populate_stream_topics_for_tests({});
 
+    var query = 'stream:of';
     var suggestions = search.get_suggestions(query);
-
     var expected = [
         "stream:of",
         "stream:office",
     ];
+    assert.deepEqual(suggestions.strings, expected);
 
+    query = 'hel';
+    suggestions = search.get_suggestions(query);
+    expected = [
+        "hel",
+        "stream:dev+help",
+    ];
     assert.deepEqual(suggestions.strings, expected);
 }());
 
@@ -664,7 +669,7 @@ init();
     var bob = {
         email: 'bob@zulip.com',
         user_id: 202,
-        full_name: 'Bob Terry',
+        full_name: 'Bob Térry',
     };
 
     var alice = {
@@ -689,7 +694,7 @@ init();
 
     var expected = [
         "te",
-        "pm-with:bob@zulip.com", // bob TErry
+        "pm-with:bob@zulip.com", // bob térry
         "pm-with:ted@zulip.com",
         "sender:bob@zulip.com",
         "sender:ted@zulip.com",

static/js/search_suggestion.js

@@ -21,10 +21,6 @@ function phrase_match(phrase, q) {
     return false;
 }
 
-function person_matches_query(person, q) {
-    return phrase_match(person.full_name, q) || phrase_match(person.email, q);
-}
-
 function stream_matches_query(stream_name, q) {
     return phrase_match(stream_name, q);
 }
@@ -83,7 +79,7 @@ function get_stream_suggestions(last, operators) {
     return objs;
 }
 
-function get_group_suggestions(all_people, last, operators) {
+function get_group_suggestions(all_persons, last, operators) {
     if (last.operator !== 'pm-with' ) {
         return [];
     }
@@ -118,21 +114,21 @@ function get_group_suggestions(all_people, last, operators) {
     // We don't suggest a person if their email is already present in the
     // operand (not including the last part).
     var parts = all_but_last_part.split(',');
-    var people = _.filter(all_people, function (person) {
+    var persons = _.filter(all_persons, function (person) {
         if (_.contains(parts, person.email)) {
             return false;
         }
-        return (last_part === '') || person_matches_query(person, last_part);
+        return (last_part === '') || people.person_matches_query(person, last_part);
     });
 
-    people.sort(typeahead_helper.compare_by_pms);
+    persons.sort(typeahead_helper.compare_by_pms);
 
-    // Take top 15 people, since they're ordered by pm_recipient_count.
+    // Take top 15 persons, since they're ordered by pm_recipient_count.
-    people = people.slice(0, 15);
+    persons = persons.slice(0, 15);
 
     var prefix = Filter.operator_to_prefix('pm-with', negated);
 
-    var suggestions = _.map(people, function (person) {
+    var suggestions = _.map(persons, function (person) {
         var term = {
             operator: 'pm-with',
             operand: all_but_last_part + ',' + person.email,
@@ -152,7 +148,7 @@ function get_group_suggestions(all_people, last, operators) {
 }
 
 // Possible args for autocomplete_operator: pm-with, sender, from
-function get_person_suggestions(all_people, last, operators, autocomplete_operator) {
+function get_person_suggestions(all_persons, last, operators, autocomplete_operator) {
     if (last.operator === "is" && last.operand === "private") {
         // Interpret 'is:private' as equivalent to 'pm-with:'
         last = {operator: "pm-with", operand: "", negated: false};
@@ -182,15 +178,15 @@ function get_person_suggestions(all_people, last, operators, autocomplete_operat
         return [];
     }
 
-    var people = _.filter(all_people, function (person) {
+    var persons = _.filter(all_persons, function (person) {
-        return person_matches_query(person, query);
+        return people.person_matches_query(person, query);
     });
 
-    people.sort(typeahead_helper.compare_by_pms);
+    persons.sort(typeahead_helper.compare_by_pms);
 
     var prefix = Filter.operator_to_prefix(autocomplete_operator, last.negated);
 
-    var objs = _.map(people, function (person) {
+    var objs = _.map(persons, function (person) {
         var name = highlight_person(query, person);
         var description = prefix + ' ' + name;
         var terms = [{