Modifed the libpostal API to add an extra function libpostal_parser_print_features to toggle debugging info. Updated address_parser app to use the new function.

libpostal.def

@@ -5,6 +5,7 @@ libpostal_expansion_array_destroy
 libpostal_address_parser_response_destroy
 libpostal_get_address_parser_default_options
 libpostal_parse_address
+libpostal_parser_print_features
 libpostal_setup
 libpostal_setup_datadir
 libpostal_teardown

src/address_parser.c

@@ -49,6 +49,13 @@ address_parser_t *get_address_parser(void) {
     return parser;
 }
 
+bool address_parser_print_features(bool print_features) {
+    if (parser == NULL) return false;
+
+    parser->options.print_features = print_features;
+    return true;
+}
+
 bool address_parser_save(address_parser_t *self, char *output_dir) {
     if (self == NULL || output_dir == NULL) return false;
 

src/address_parser.h

@@ -215,6 +215,7 @@ address_parser_t *address_parser_new_options(parser_options_t options);
 address_parser_t *get_address_parser(void);
 bool address_parser_load(char *dir);
 
+bool address_parser_print_features(bool print_features);
 libpostal_address_parser_response_t *address_parser_parse(char *address, char *language, char *country);
 void address_parser_destroy(address_parser_t *self);
 

src/address_parser_cli.c

@@ -73,23 +73,23 @@ int main(int argc, char **argv) {
 
             cstring_array_destroy(command);
             goto next_input;
-        } /*else if (string_starts_with(input, ".print_features")) {
+        } else if (string_starts_with(input, ".print_features")) {
             size_t num_tokens = 0;
             cstring_array *command = cstring_array_split(input, " ", 1, &num_tokens);
             if (cstring_array_num_strings(command) > 1) {
                 char *flag = cstring_array_get_string(command, 1);
                 if (string_compare_case_insensitive(flag, "off") == 0) {
-                    parser->options.print_features = false;
+                    libpostal_parser_print_features(false);
                 } else if (string_compare_case_insensitive(flag, "on") == 0) {
-                    parser->options.print_features = true;
+                    libpostal_parser_print_features(true);
                 }
             } else {
-                parser->options.print_features = true;
+                libpostal_parser_print_features(true);
             }
 
             cstring_array_destroy(command);
             goto next_input;
-        }*/ else if (strlen(input) == 0) {
+        } else if (strlen(input) == 0) {
             goto next_input;
         }
 

src/libpostal.c

@@ -1073,6 +1073,10 @@ libpostal_address_parser_response_t *libpostal_parse_address(char *address, libp
     return parsed;
 }
 
+bool libpostal_parser_print_features(bool print_features) {
+    return address_parser_print_features(print_features);
+}
+
 bool libpostal_setup_datadir(char *datadir) {
     char *transliteration_path = NULL;
     char *numex_path = NULL;

src/libpostal.h

@@ -101,6 +101,8 @@ LIBPOSTAL_EXPORT libpostal_address_parser_options_t libpostal_get_address_parser
 
 LIBPOSTAL_EXPORT libpostal_address_parser_response_t *libpostal_parse_address(char *address, libpostal_address_parser_options_t options);
 
+LIBPOSTAL_EXPORT bool libpostal_parser_print_features(bool print_features);
+
 // Setup/teardown methods
 
 LIBPOSTAL_EXPORT bool libpostal_setup(void);