* add mu_str_from_list, mu_str_to_list and mu_str_list_free + unit tests

src/mu-str.c

@@ -371,6 +371,65 @@ mu_str_size_parse_kmg (const char* str)
 
 }
 
+
+
+char*
+mu_str_from_list (const GSList *lst, char sepa)
+{
+	const GSList *cur;
+	char *str;
+
+	g_return_val_if_fail (sepa, NULL);
+	
+	for (cur = lst, str = NULL; cur; cur = g_slist_next(cur)) {
+
+		char *tmp;
+		char sep[2] = { '\0', '\0' };
+		sep[0] = cur->next ? sepa : '\0';
+
+		tmp = g_strdup_printf ("%s%s%s",
+				       str ? str : "",
+				       (gchar*)cur->data,
+				       sep);
+		g_free (str);
+		str = tmp;
+	}
+	
+	return str;
+}
+
+GSList*
+mu_str_to_list (const char *str, char sepa)
+{
+	GSList *lst;
+	gchar **strs, **cur;
+	char sep[] = { '\0', '\0' };
+	
+	g_return_val_if_fail (sepa, NULL);
+	
+	if (!str)
+		return NULL;
+
+	sep[0] = sepa;
+	strs = g_strsplit (str, sep, -1);
+
+	for (cur = strs, lst = NULL; cur && *cur; ++cur)
+		lst = g_slist_prepend (lst, g_strdup(*cur));
+		
+	lst = g_slist_reverse (lst);
+	g_strfreev (strs);
+
+	return lst;
+}
+
+void
+mu_str_free_list (GSList *lst)
+{
+	g_slist_foreach (lst, (GFunc)g_free, NULL);
+	g_slist_free (lst);	
+}
+
+
 /*
  * Xapian treats various characters such as '@', '-', ':' and '.'
  * specially; function below is an ugly hack to make it DWIM in most

src/mu-str.h

@@ -265,6 +265,34 @@ char* mu_str_escape_c_literal (const gchar* str)
 #define mu_str_is_empty(S) ((!(S)||!(*S))?TRUE:FALSE)
 
 
+/**
+ * convert a GSList of strings to a #sepa-separated list
+ * 
+ * @param lst a GSList
+ * @param the separator character
+ * 
+ * @return a newly allocated string
+ */
+char* mu_str_from_list (const GSList *lst, char sepa);
+
+
+/**
+ * convert a #sepa-separated list of strings in to a GSList
+ * 
+ * @param str a #sepa-separated list of strings
+ * @param the separator character
+ *
+ * @return a newly allocated GSList (free with mu_str_free_list)
+ */
+GSList* mu_str_to_list (const char *str, char sepa);
+
+
+/**
+ * free a GSList consisting of allocated strings
+ * 
+ * @param lst a GSList
+ */
+void mu_str_free_list (GSList *lst);
 
 /**
  * guess some nick name for the given name; if we can determine an

src/tests/test-mu-str.c

@@ -255,6 +255,89 @@ test_mu_str_date_parse_hdwmy (void)
 }
 
 
+static void
+assert_cmplst (GSList *lst, const char *items[])
+{
+	int i;
+
+	if (!lst) 
+		g_assert (!items);
+	
+	for (i = 0; lst; lst = g_slist_next(lst), ++i) 
+		g_assert_cmpstr ((char*)lst->data,==,items[i]);
+
+	g_assert (items[i] == NULL);
+}
+
+
+static GSList*
+create_list (const char *items[])
+{
+	GSList *lst;
+
+	lst = NULL;
+	while (items && *items) {
+		lst = g_slist_prepend (lst, g_strdup(*items));
+		++items;
+	}
+
+	return g_slist_reverse (lst);
+	
+}
+
+static void
+test_mu_str_from_list (void)
+{
+	{
+		const char *strs[] = {"aap", "noot", "mies", NULL};
+		GSList *lst = create_list (strs);
+		gchar  *str = mu_str_from_list (lst, ',');
+		g_assert_cmpstr ("aap,noot,mies", ==, str);
+		mu_str_free_list (lst);
+		g_free (str);
+	}
+
+	{
+		const char *strs[] = {"aap", "no,ot", "mies", NULL};
+		GSList *lst = create_list (strs);
+		gchar  *str = mu_str_from_list (lst, ',');
+		g_assert_cmpstr ("aap,no,ot,mies", ==, str);
+		mu_str_free_list (lst);
+		g_free (str);
+	}
+
+	{
+		const char *strs[] = {NULL};
+		GSList *lst = create_list (strs);
+		gchar  *str = mu_str_from_list (lst,'@');
+		g_assert_cmpstr (NULL, ==, str);
+		mu_str_free_list (lst);
+		g_free (str);
+	}
+	
+
+}
+
+
+static void
+test_mu_str_to_list (void)
+{
+	{
+		const char *items[]= {"foo", "bar", "cuux", NULL};
+		GSList *lst = mu_str_to_list ("foo@bar@cuux",'@');
+		assert_cmplst (lst, items);
+		mu_str_free_list (lst);
+	}
+
+	{
+		GSList *lst = mu_str_to_list (NULL,'x');
+		g_assert (lst == NULL);
+		mu_str_free_list (lst);
+	}
+}
+
+
+
 static void
 test_mu_str_guess_first_name (void)
 {
@@ -365,6 +448,10 @@ main (int argc, char *argv[])
 	g_test_add_func ("/mu-str/mu-str-display_contact",
 			 test_mu_str_display_contact);			 
 	
+	g_test_add_func ("/mu-str/mu-str-from-list",
+			 test_mu_str_from_list);
+	g_test_add_func ("/mu-str/mu-str-to-list",
+			 test_mu_str_to_list);
 	
 	g_test_add_func ("/mu-str/mu-str_date_parse_hdwmy",
 			 test_mu_str_date_parse_hdwmy);