src: introduce simple hints on incorrect identifier

 # cat test.nft
 define test = "1.2.3.4"

 table ip x {
        chain y {
                ip saddr $text
        }
 }
 # nft -f test.nft
 test.nft:5:13-16: Error: unknown identifier 'text'; did you mean identifier ‘test’?
                 ip saddr $text
                           ^^^^

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/rule.c b/src/rule.c
index 0a3c1970..ad300129 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -692,6 +692,24 @@ struct symbol *symbol_lookup(const struct scope *scope, const char *identifier)
 	return NULL;
 }
 
+struct symbol *symbol_lookup_fuzzy(const struct scope *scope,
+				   const char *identifier)
+{
+	struct string_misspell_state st;
+	struct symbol *sym;
+
+	string_misspell_init(&st);
+
+	while (scope != NULL) {
+		list_for_each_entry(sym, &scope->symbols, list)
+			string_misspell_update(sym->identifier, identifier,
+					       sym, &st);
+
+		scope = scope->parent;
+	}
+	return st.obj;
+}
+
 static const char * const chain_type_str_array[] = {
 	"filter",
 	"nat",