[nautilus] location-entry: Use relative completions for relative paths

[António Fernandes <antoniof src gnome org>]

commit dbd5be23a6645188f942ee99a22f91966ae83260
Author: James Westman <james flyingpimonster net>
Date:   Thu Dec 31 19:59:18 2020 -0600

    location-entry: Use relative completions for relative paths
    
    If the user enters a relative path, we get absolute paths as in the
    completion popover, which is quite jarring and makes it less useful.
    
    Instead, truncate the prefix, such that the completions dropdown text
    aligns with the entry text.

 src/nautilus-location-entry.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)
---
diff --git a/src/nautilus-location-entry.c b/src/nautilus-location-entry.c
index 7d14a9dc3..f09611f19 100644
--- a/src/nautilus-location-entry.c
+++ b/src/nautilus-location-entry.c
@@ -363,11 +363,14 @@ update_completions_store (gpointer callback_data)
     GtkEditable *editable;
     g_autofree char *absolute_location = NULL;
     g_autofree char *user_location = NULL;
+    gboolean is_relative = FALSE;
     int start_sel;
     g_autofree char *uri_scheme = NULL;
     g_auto (GStrv) completions = NULL;
+    char *completion;
     int i;
     GtkTreeIter iter;
+    int current_dir_strlen;
 
     entry = NAUTILUS_LOCATION_ENTRY (callback_data);
     priv = nautilus_location_entry_get_instance_private (entry);
@@ -390,6 +393,7 @@ update_completions_store (gpointer callback_data)
 
     if (!g_path_is_absolute (user_location) && uri_scheme == NULL && user_location[0] != '~')
     {
+        is_relative = TRUE;
         absolute_location = g_build_filename (priv->current_directory, user_location, NULL);
     }
     else
@@ -402,10 +406,25 @@ update_completions_store (gpointer callback_data)
     /* populate the completions model */
     gtk_list_store_clear (priv->completions_store);
 
+    current_dir_strlen = strlen (priv->current_directory);
     for (i = 0; completions[i] != NULL; i++)
     {
+        completion = completions[i];
+
+        if (is_relative && strlen (completion) >= current_dir_strlen)
+        {
+            /* For relative paths, we need to strip the current directory
+             * (and the trailing slash) so the completions will match what's
+             * in the text entry */
+            completion += current_dir_strlen;
+            if (G_IS_DIR_SEPARATOR (completion[0]))
+            {
+                completion++;
+            }
+        }
+
         gtk_list_store_append (priv->completions_store, &iter);
-        gtk_list_store_set (priv->completions_store, &iter, 0, completions[i], -1);
+        gtk_list_store_set (priv->completions_store, &iter, 0, completion, -1);
     }
 
     /* refilter the completions dropdown */