[nautilus] rename-file-popover: Warn when name exceeds size limit

[Carlos Soriano <csoriano src gnome org>]

commit 122f201dcf356460a30a7b260730bcfc7246a614
Author: Harish Nair <harishnair96 gmail com>
Date:   Tue May 15 11:27:41 2018 +0530

    rename-file-popover: Warn when name exceeds size limit
    
    When a file is renamed if the name entered by user has a length that
    exceeds maximum limit then it shows a window with a warning.
    
    The problem is that once the user has acknowledged the warning, the file
    name goes back to its original name. The user is not given a chance to
    make slight modifications in the name that was entered.
    
    To fix this problem, a warning will be given in the popup itself where the
    new filename is entered. That way the user will be able to make slight
    changes so that the file name is within the size limit.
    
    https://gitlab.gnome.org/GNOME/nautilus/issues/148

 src/nautilus-rename-file-popover-controller.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
---
diff --git a/src/nautilus-rename-file-popover-controller.c b/src/nautilus-rename-file-popover-controller.c
index 2c10e07e2..a651200a0 100644
--- a/src/nautilus-rename-file-popover-controller.c
+++ b/src/nautilus-rename-file-popover-controller.c
@@ -103,8 +103,14 @@ nautilus_rename_file_popover_controller_name_is_valid (NautilusFileNameWidgetCon
                                                        gchar                            **error_message)
 {
     NautilusRenameFilePopoverController *self;
+    NautilusDirectory *directory;
+    glong max_name_length;
+    size_t name_length;
 
     self = NAUTILUS_RENAME_FILE_POPOVER_CONTROLLER (controller);
+    directory = nautilus_file_get_directory (self->target_file);
+    name_length = strlen (name);
+    max_name_length = nautilus_directory_get_max_child_name_length (directory);
 
     if (strlen (name) == 0)
     {
@@ -144,6 +150,17 @@ nautilus_rename_file_popover_controller_name_is_valid (NautilusFileNameWidgetCon
             *error_message = _("A file cannot be called “..”.");
         }
     }
+    else if (name_length > max_name_length + 1 && max_name_length != -1)
+    {
+        if (self->target_is_folder)
+        {
+            *error_message = _("Folder name is too long.");
+        }
+        else
+        {
+            *error_message = _("File name is too long.");
+        }
+    }
 
     return *error_message == NULL;
 }