cli: add new style for tokenizing/concatenating list options in nmcli

nmcli supports list options (optlist and multilist properties).
These commonly are individual items, concatenated by a delimiter.

It should be generally possibly to express every value. That means, we
need some for of escaping mechanism for delimiters.

Currently this is all inconsistent or no escaping is supported. I intend
to fix that (which will be a change in behavior).

For now, just add yet another style of tokenzing/concatenating list
items in nmcli. This is the style to replace all other styles.

(cherry picked from commit ba956bd499)

clients/common/nm-meta-setting-desc.c

@@ -167,12 +167,16 @@ _value_str_as_index_list (const char *value, gsize *out_len)
 
 #define MULTILIST_WITH_ESCAPE_CHARS     NM_ASCII_SPACES","
 
+#define ESCAPED_TOKENS_DELIMTER         ','
+#define ESCAPED_TOKENS_DELIMTERS        ","
+
 typedef enum {
 	VALUE_STRSPLIT_MODE_STRIPPED,
 	VALUE_STRSPLIT_MODE_OBJLIST,
 	VALUE_STRSPLIT_MODE_OBJLIST_WITH_ESCAPE,
 	VALUE_STRSPLIT_MODE_MULTILIST,
 	VALUE_STRSPLIT_MODE_MULTILIST_WITH_ESCAPE,
+	VALUE_STRSPLIT_MODE_ESCAPED_TOKENS,
 } ValueStrsplitMode;
 
 static const char *
@@ -211,6 +215,10 @@ _value_strsplit (const char *value,
 	case VALUE_STRSPLIT_MODE_MULTILIST_WITH_ESCAPE:
 		strv = nm_utils_strsplit_set_full (value, MULTILIST_WITH_ESCAPE_CHARS, NM_UTILS_STRSPLIT_SET_FLAGS_ALLOW_ESCAPING);
 		break;
+	case VALUE_STRSPLIT_MODE_ESCAPED_TOKENS:
+		strv = nm_utils_escaped_tokens_split (value, ESCAPED_TOKENS_DELIMTERS);
+		NM_SET_OUT (out_len, NM_PTRARRAY_LEN (strv));
+		return g_steal_pointer (&strv);
 	default:
 		nm_assert_not_reached ();
 		break;
@@ -1882,9 +1890,11 @@ _set_fcn_multilist (ARGS_SET_FCN)
 	}
 
 	strv = _value_strsplit (value,
-	                          property_info->property_typ_data->subtype.multilist.strsplit_with_escape
+	                          property_info->property_typ_data->subtype.multilist.strsplit_escaped_tokens
-	                        ? VALUE_STRSPLIT_MODE_MULTILIST_WITH_ESCAPE
+	                        ? VALUE_STRSPLIT_MODE_ESCAPED_TOKENS
-	                        : VALUE_STRSPLIT_MODE_MULTILIST,
+	                        : (  property_info->property_typ_data->subtype.multilist.strsplit_with_escape
+	                           ? VALUE_STRSPLIT_MODE_OBJLIST_WITH_ESCAPE
+	                           : VALUE_STRSPLIT_MODE_OBJLIST),
 	                        &nstrv);
 
 	j = 0;
@@ -3061,9 +3071,11 @@ _get_fcn_objlist (ARGS_GET_FCN)
 			if (   get_type == NM_META_ACCESSOR_GET_TYPE_PRETTY
 			    && property_info->property_typ_data->subtype.objlist.delimit_pretty_with_semicolon)
 				g_string_append (str, "; ");
-			else
+			else {
+				G_STATIC_ASSERT_EXPR (ESCAPED_TOKENS_DELIMTER == ',');
 				g_string_append (str, ", ");
 			}
+		}
 
 		start_offset = str->len;
 
@@ -3271,9 +3283,11 @@ _set_fcn_objlist (ARGS_SET_FCN)
 	}
 
 	strv = _value_strsplit (value,
-	                          property_info->property_typ_data->subtype.objlist.strsplit_with_escape
+	                          property_info->property_typ_data->subtype.objlist.strsplit_escaped_tokens
+	                        ? VALUE_STRSPLIT_MODE_ESCAPED_TOKENS
+	                        : (  property_info->property_typ_data->subtype.objlist.strsplit_with_escape
 	                           ? VALUE_STRSPLIT_MODE_OBJLIST_WITH_ESCAPE
-	                        : VALUE_STRSPLIT_MODE_OBJLIST,
+	                           : VALUE_STRSPLIT_MODE_OBJLIST),
 	                        &nstrv);
 
 	if (_SET_FCN_DO_SET_ALL (modifier, value)) {

clients/common/nm-meta-setting-desc.h

@@ -281,6 +281,7 @@ struct _NMMetaPropertyTypData {
 			void (*remove_by_idx_fcn_s) (NMSetting *setting, int idx);
 			gboolean (*remove_by_value_fcn) (NMSetting *setting, const char *item);
 			bool strsplit_with_escape:1;
+			bool strsplit_escaped_tokens:1;
 		} multilist;
 		struct {
 			guint (*get_num_fcn) (NMSetting *setting);
@@ -297,6 +298,7 @@ struct _NMMetaPropertyTypData {
 			void (*remove_by_idx_fcn_s) (NMSetting *setting, int idx);
 			bool delimit_pretty_with_semicolon:1;
 			bool strsplit_with_escape:1;
+			bool strsplit_escaped_tokens:1;
 		} objlist;
 		struct {
 			gboolean (*set_fcn) (NMSetting *setting,