add option metaflac --show-all-tags

Co-authored-by: Martijn van Beurden <mvanb1@gmail.com>

man/metaflac.md

@@ -109,6 +109,9 @@ modification time is set to the current time):
 **\--show-tag=name**  
 :	Show all tags where the field name matches 'name'.
 
+**\--show-all-tags**  
+:	Show all tags. This is an alias for --export-tags-to=-.
+
 **\--remove-tag=name**  
 :	Remove all tags whose field name is 'name'.
 

src/metaflac/options.c

@@ -65,6 +65,7 @@ struct share__option long_options_[] = {
 	{ "set-bps", 1, 0, 0 }, /* undocumented */
 	{ "set-total-samples", 1, 0, 0 }, /* undocumented */ /* WATCHOUT: used by test/test_flac.sh on windows */
 	{ "show-vendor-tag", 0, 0, 0 },
+	{ "show-all-tags", 0, 0, 0 },
 	{ "show-tag", 1, 0, 0 },
 	{ "remove-all-tags", 0, 0, 0 },
 	{ "remove-all-tags-except", 1, 0, 0 },
@@ -496,6 +497,10 @@ FLAC__bool parse_option(int option_index, const char *option_argument, CommandLi
 			ok = false;
 		}
 	}
+	else if(0 == strcmp(opt, "show-all-tags")) {
+		op = append_shorthand_operation(options, OP__EXPORT_VC_TO);
+		parse_string("-",&op->argument.filename.value);
+	}
 	else if(0 == strcmp(opt, "remove-all-tags")) {
 		(void) append_shorthand_operation(options, OP__REMOVE_VC_ALL);
 	}

src/metaflac/usage.c

@@ -124,6 +124,7 @@ int long_usage(const char *message, ...)
 	fprintf(out, "\n");
 	fprintf(out, "--show-vendor-tag     Show the vendor string from the VORBIS_COMMENT block.\n");
 	fprintf(out, "--show-tag=NAME       Show all tags where the field name matches 'NAME'.\n");
+	fprintf(out, "--show-all-tags       Show all tags. This is an alias for --export-tags-to=-.\n");
 	fprintf(out, "--remove-tag=NAME     Remove all tags whose field name is 'NAME'.\n");
 	fprintf(out, "--remove-first-tag=NAME  Remove first tag whose field name is 'NAME'.\n");
 	fprintf(out, "--remove-all-tags     Remove all tags, leaving only the vendor string.\n");

test/metaflac-test-files/Makefile.am

@@ -80,7 +80,8 @@ EXTRA_DIST = \
 	case60-expect.meta \
 	case61-expect.meta \
 	case62-expect.meta \
-	case63-expect.meta
+	case63-expect.meta \
+	case64-expect.meta
 
 clean-local:
 	-rm -f out.*

test/metaflac-test-files/case64-expect.meta

@@ -0,0 +1,3 @@
+TITLE=Tittle
+artist=Fartist
+artist=artits

test/test_metaflac.sh

@@ -372,6 +372,8 @@ metaflac_test case62 "--import-picture-from" "--list"
 run_metaflac --remove-all-tags-except=artist=title $flacfile
 check_flac
 metaflac_test case63 "--remove-all-tags-except=artist=title" "--list"
+metaflac_test case64 "--export-tags-to=-" "--export-tags-to=-"
+metaflac_test case64 "--show-all-tags" "--show-all-tags"
 
 # UNKNOWN blocks
 echo $ECHO_N "Testing FLAC file with unknown metadata... " $ECHO_C