[gthumb] tag filter: added ability to filter using a regular expression

[Paolo Bacchilega <paobac src gnome org>]

commit ea10110277f3ae7d9542665361671fd9d1a7f0c7
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Aug 13 16:37:37 2016 +0200

    tag filter: added ability to filter using a regular expression

 gthumb/gth-test-category.c |   34 ++++++++++++++++++++++++++--------
 1 files changed, 26 insertions(+), 8 deletions(-)
---
diff --git a/gthumb/gth-test-category.c b/gthumb/gth-test-category.c
index e9e6c3c..19b3fad 100644
--- a/gthumb/gth-test-category.c
+++ b/gthumb/gth-test-category.c
@@ -45,7 +45,8 @@ typedef struct {
 GthOpData category_op_data[] = {
        { N_("is"), GTH_TEST_OP_CONTAINS, FALSE },
        { N_("is only"), GTH_TEST_OP_CONTAINS_ONLY, FALSE },
-       { N_("is not"), GTH_TEST_OP_CONTAINS, TRUE }
+       { N_("is not"), GTH_TEST_OP_CONTAINS, TRUE },
+       { N_("matches"), GTH_TEST_OP_MATCHES, FALSE }
 };
 
 
@@ -281,7 +282,8 @@ gth_test_category_real_match (GthTest     *test,
        if (test_category->priv->category != NULL) {
                GthMetadata   *metadata;
                GList         *list, *scan;
-               char          *test_category_casefolded;
+               char          *test_category_casefolded = NULL;
+               GPatternSpec  *pattern = NULL;
 
                list = NULL;
                metadata = (GthMetadata *) g_file_info_get_attribute_object (file->info, 
gth_test_get_attributes (GTH_TEST (test_category)));
@@ -297,17 +299,33 @@ gth_test_category_real_match (GthTest     *test,
                                return test_category->priv->negative ? GTH_MATCH_YES : GTH_MATCH_NO;
                }
 
-               test_category_casefolded = g_utf8_casefold (test_category->priv->category, -1);
                for (scan = list; ! result && scan; scan = scan->next) {
-                       char *category;
-
-                       category = g_utf8_casefold (scan->data, -1);
-                       if (g_utf8_collate (category, test_category_casefolded) == 0)
-                               result = TRUE;
+                       char *category = g_utf8_casefold (scan->data, -1);
+
+                       switch (test_category->priv->op) {
+                       case GTH_TEST_OP_CONTAINS:
+                       case GTH_TEST_OP_CONTAINS_ONLY:
+                               if (test_category_casefolded == NULL)
+                                       test_category_casefolded = g_utf8_casefold 
(test_category->priv->category, -1);
+                               if (g_utf8_collate (category, test_category_casefolded) == 0)
+                                       result = TRUE;
+                               break;
+
+                       case GTH_TEST_OP_MATCHES:
+                               if (pattern == NULL)
+                                       pattern = g_pattern_spec_new (test_category->priv->category);
+                               result = g_pattern_match_string (pattern, scan->data);
+                               break;
+
+                       default:
+                               break;
+                       }
 
                        g_free (category);
                }
 
+               if (pattern != NULL)
+                       g_pattern_spec_free (pattern);
                g_free (test_category_casefolded);
        }