Sort by File Extension for Grid and List View (#3666)

* Add support for sorting files by extension

- Added NEMO_FILE_SORT_BY_EXTENSION to sort types.
- Implemented compare_by_extension logic with case-insensitive grouping.
- Added Extension column to List View for sorting.
- Added Sort by Extension to Icon View context menu.
- Added Extension sort option to Desktop View and Customization Overlay.

Co-authored-by: Jombo <[email protected]>

Author: Jombolio

gresources/nemo-desktop-overlay.glade

@@ -131,6 +131,11 @@
         <col id="1" translatable="yes">Date</col>
         <col id="2">Desktop Sort by Date</col>
       </row>
+      <row>
+        <col id="0">10</col>
+        <col id="1" translatable="yes">Extension</col>
+        <col id="2">Desktop Sort by Extension</col>
+      </row>
     </data>
   </object>
   <object class="XAppGtkWindow" id="overlay_window">

gresources/nemo-icon-view-ui.xml

@@ -10,8 +10,9 @@
 					<menuitem name="Sort by Type" action="Sort by Type"/>
 					<menuitem name="Sort by Detailed Type" action="Sort by Detailed Type"/>
 					<menuitem name="Sort by Modification Date" action="Sort by Modification Date"/>
-					<menuitem name="Sort by Trash Time" action="Sort by Trash Time"/>
-				</placeholder>
+					      <menuitem name="Sort by Trash Time" action="Sort by Trash Time"/>
+					      <menuitem name="Sort by Extension" action="Sort by Extension"/>
+					</placeholder>
 				<separator name="Layout separator"/>
 				<menuitem name="Reversed Order" action="Reversed Order"/>
 			</menu>
@@ -32,8 +33,9 @@
 					<menuitem name="Sort by Type" action="Sort by Type"/>
 					<menuitem name="Sort by Detailed Type" action="Sort by Detailed Type"/>
 					<menuitem name="Sort by Modification Date" action="Sort by Modification Date"/>
-					<menuitem name="Sort by Trash Time" action="Sort by Trash Time"/>
-				</placeholder>
+					      <menuitem name="Sort by Trash Time" action="Sort by Trash Time"/>
+					      <menuitem name="Sort by Extension" action="Sort by Extension"/>
+					</placeholder>
 				<separator name="Layout separator"/>
 				<menuitem name="Reversed Order" action="Reversed Order"/>
 			</menu>

libnemo-private/nemo-column-utilities.c

@@ -144,6 +144,13 @@ get_builtin_columns (void)
 					       "label", _("MIME Type"),
 					       "description", _("The mime type of the file."),
 					       NULL));
+	columns = g_list_append (columns,
+				 g_object_new (NEMO_TYPE_COLUMN,
+					       "name", "extension",
+					       "attribute", "extension",
+					       "label", _("Extension"),
+					       "description", _("The extension of the file."),
+					       NULL));
 #ifdef HAVE_SELINUX
 	columns = g_list_append (columns,
 				 g_object_new (NEMO_TYPE_COLUMN,

libnemo-private/nemo-file.c

@@ -164,8 +164,9 @@ static GQuark attribute_name_q,
 	attribute_link_target_q,
 	attribute_volume_q,
 	attribute_free_space_q,
-    attribute_search_result_snippet_q,
-    attribute_search_result_count_q;
+	attribute_extension_q,
+	attribute_search_result_snippet_q,
+	attribute_search_result_count_q;
 
 static void     nemo_file_info_iface_init                (NemoFileInfoInterface *iface);
 
@@ -3226,6 +3227,48 @@ compare_by_type (NemoFile *file_1, NemoFile *file_2, gboolean detailed)
 	return result;
 }
 
+static int
+compare_by_extension (NemoFile *file_1, NemoFile *file_2)
+{
+    const char *name_1, *name_2;
+    char *ext_1, *ext_2;
+    char *ext_1_folded, *ext_2_folded;
+    int result;
+
+    name_1 = nemo_file_peek_display_name (file_1);
+    name_2 = nemo_file_peek_display_name (file_2);
+
+    ext_1 = eel_filename_get_extension_offset (name_1);
+    ext_2 = eel_filename_get_extension_offset (name_2);
+
+    if (ext_1 == NULL && ext_2 == NULL) {
+        return 0;
+    }
+
+    if (ext_1 == NULL) {
+        return -1;
+    }
+
+    if (ext_2 == NULL) {
+        return 1;
+    }
+
+    /* Skip the dot */
+    ext_1++;
+    ext_2++;
+
+    /* Case-insensitive comparison */
+    ext_1_folded = g_utf8_casefold (ext_1, -1);
+    ext_2_folded = g_utf8_casefold (ext_2, -1);
+
+    result = g_utf8_collate (ext_1_folded, ext_2_folded);
+
+    g_free (ext_1_folded);
+    g_free (ext_2_folded);
+
+    return result;
+}
+
 static int
 compare_by_time (NemoFile *file_1, NemoFile *file_2, NemoDateType type)
 {
@@ -3410,6 +3453,12 @@ nemo_file_compare_for_sort (NemoFile *file_1,
             if (result == 0) {
                 result = compare_by_full_path (file_1, file_2);
             }
+            break;
+        case NEMO_FILE_SORT_BY_EXTENSION:
+            result = compare_by_extension (file_1, file_2);
+            if (result == 0) {
+                result = compare_by_full_path (file_1, file_2);
+            }
             break;
 		case NEMO_FILE_SORT_BY_MTIME:
 			result = compare_by_time (file_1, file_2, NEMO_DATE_TYPE_MODIFIED);
@@ -3500,6 +3549,13 @@ nemo_file_compare_for_sort_by_attribute_q   (NemoFile                   *file_1,
                                favorites_first,
                                reversed,
                                search_dir);
+	} else if (attribute == attribute_extension_q) {
+        return nemo_file_compare_for_sort (file_1, file_2,
+                               NEMO_FILE_SORT_BY_EXTENSION,
+                               directories_first,
+                               favorites_first,
+                               reversed,
+                               search_dir);
 	} else if (attribute == attribute_modification_date_q ||
                attribute == attribute_date_modified_q ||
                attribute == attribute_date_modified_with_time_q ||
@@ -6724,6 +6780,16 @@ nemo_file_get_string_attribute_q (NemoFile *file, GQuark attribute_q)
 	if (attribute_q == attribute_name_q) {
 		return nemo_file_get_display_name (file);
 	}
+    if (attribute_q == attribute_extension_q) {
+        const char *name;
+        char *ext;
+        name = nemo_file_peek_display_name (file);
+        ext = eel_filename_get_extension_offset (name);
+        if (ext) {
+            return g_strdup (ext + 1);
+        }
+        return NULL;
+    }
 	if (attribute_q == attribute_type_q) {
 		return nemo_file_get_type_as_string (file);
 	}
@@ -8959,6 +9025,7 @@ nemo_file_class_init (NemoFileClass *class)
 	attribute_link_target_q = g_quark_from_static_string ("link_target");
 	attribute_volume_q = g_quark_from_static_string ("volume");
 	attribute_free_space_q = g_quark_from_static_string ("free_space");
+    attribute_extension_q = g_quark_from_static_string ("extension");
     attribute_search_result_snippet_q = g_quark_from_string ("search_result_snippet");
     attribute_search_result_count_q = g_quark_from_string ("search_result_count");
 

libnemo-private/nemo-file.h

@@ -64,10 +64,10 @@ typedef enum {
 	NEMO_FILE_SORT_BY_MTIME,
     NEMO_FILE_SORT_BY_ATIME,
 	NEMO_FILE_SORT_BY_TRASHED_TIME,
-    NEMO_FILE_SORT_BY_BTIME,
-    NEMO_FILE_SORT_BY_SEARCH_RESULT_COUNT
-} NemoFileSortType;	
-
+	NEMO_FILE_SORT_BY_BTIME,
+	NEMO_FILE_SORT_BY_SEARCH_RESULT_COUNT,
+	NEMO_FILE_SORT_BY_EXTENSION
+} NemoFileSortType;
 typedef enum {
 	NEMO_REQUEST_NOT_STARTED,
 	NEMO_REQUEST_IN_PROGRESS,

src/nemo-desktop-icon-grid-view.c

@@ -109,6 +109,11 @@ static const DesktopSortCriterion sort_criteria[] = {
         "Desktop Sort by Date",
         "modification date",
         NEMO_FILE_SORT_BY_MTIME
+    },
+    {
+        "Desktop Sort by Extension",
+        "extension",
+        NEMO_FILE_SORT_BY_EXTENSION
     }
 };
 
@@ -1085,7 +1090,11 @@ static const GtkRadioActionEntry desktop_sort_radio_entries[] = {
     { "Desktop Sort by Date", NULL,
       N_("Date"), NULL,
       NULL,
-      NEMO_FILE_SORT_BY_MTIME }  
+      NEMO_FILE_SORT_BY_MTIME },
+    { "Desktop Sort by Extension", NULL,
+      N_("Extension"), NULL,
+      NULL,
+      NEMO_FILE_SORT_BY_EXTENSION }
 };
 
 static const GtkActionEntry desktop_grid_entries[] = {

src/nemo-desktop-overlay.c

@@ -207,6 +207,9 @@ sync_controls (NemoDesktopOverlay *overlay,
             case NEMO_FILE_SORT_BY_MTIME:
                 combo_id = "Desktop Sort by Date";
                 break;
+            case NEMO_FILE_SORT_BY_EXTENSION:
+                combo_id = "Desktop Sort by Extension";
+                break;
             case NEMO_FILE_SORT_BY_DISPLAY_NAME:
             default:
                 combo_id = "Desktop Sort by Name";

src/nemo-icon-view.c

@@ -165,13 +165,20 @@ static const SortCriterion sort_criteria[] = {
 		N_("by Modification _Date"),
 		N_("Keep icons sorted by modification date in rows")
 	},
-	{
-		NEMO_FILE_SORT_BY_TRASHED_TIME,
-		"trashed",
-		"Sort by Trash Time",
-		N_("by T_rash Time"),
-		N_("Keep icons sorted by trash time in rows")
-	}
+  {
+    	NEMO_FILE_SORT_BY_TRASHED_TIME,
+    	"trashed",
+    	"Sort by Trash Time",
+    	N_("by T_rash Time"),
+    	N_("Keep icons sorted by trash time in rows")
+  },
+  {
+    	NEMO_FILE_SORT_BY_EXTENSION,
+    	"extension",
+    	"Sort by Extension",
+    	N_("by _Extension"),
+    	N_("Keep icons sorted by extension in rows")
+  }
 };
 
 static void                 nemo_icon_view_set_directory_sort_by        (NemoIconView           *icon_view,
@@ -1448,6 +1455,10 @@ static const GtkRadioActionEntry arrange_radio_entries[] = {
     N_("By T_rash Time"), NULL,
     N_("Keep icons sorted by trash time in rows"),
     NEMO_FILE_SORT_BY_TRASHED_TIME },
+  { "Sort by Extension", NULL,
+    N_("By _Extension"), NULL,
+    N_("Keep icons sorted by extension in rows"),
+    NEMO_FILE_SORT_BY_EXTENSION },
 };
 
 static void