perf list: Fix the --no-desc option

Currently, the --no-desc option in perf list isn't functioning as
intended.

This issue arises from the overwriting of struct option->desc with the
opposite value of struct option->long_desc. Consequently, whatever
parse_options() returns at struct option->desc gets overridden later,
rendering the --desc or --no-desc arguments ineffective.

To resolve this, set ->desc as true by default and allow parse_options()
to adjust it accordingly. This adjustment will fix the --no-desc
option while preserving the functionality of the other parameters.
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: leit@meta.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240517141427.1905691-1-leitao@debian.org

tools/perf/builtin-list.c

@@ -162,7 +162,11 @@ static void default_print_event(void *ps, const char *pmu_name, const char *topi
 	} else
 		fputc('\n', fp);
 
-	if (desc && print_state->desc) {
+	if (long_desc && print_state->long_desc) {
+		fprintf(fp, "%*s", 8, "[");
+		wordwrap(fp, long_desc, 8, pager_get_columns(), 0);
+		fprintf(fp, "]\n");
+	} else if (desc && print_state->desc) {
 		char *desc_with_unit = NULL;
 		int desc_len = -1;
 
@@ -178,12 +182,6 @@ static void default_print_event(void *ps, const char *pmu_name, const char *topi
 		fprintf(fp, "]\n");
 		free(desc_with_unit);
 	}
-	long_desc = long_desc ?: desc;
-	if (long_desc && print_state->long_desc) {
-		fprintf(fp, "%*s", 8, "[");
-		wordwrap(fp, long_desc, 8, pager_get_columns(), 0);
-		fprintf(fp, "]\n");
-	}
 
 	if (print_state->detailed && encoding_desc) {
 		fprintf(fp, "%*s", 8, "");
@@ -256,15 +254,14 @@ static void default_print_metric(void *ps,
 	}
 	fprintf(fp, "  %s\n", name);
 
-	if (desc && print_state->desc) {
-		fprintf(fp, "%*s", 8, "[");
-		wordwrap(fp, desc, 8, pager_get_columns(), 0);
-		fprintf(fp, "]\n");
-	}
 	if (long_desc && print_state->long_desc) {
 		fprintf(fp, "%*s", 8, "[");
 		wordwrap(fp, long_desc, 8, pager_get_columns(), 0);
 		fprintf(fp, "]\n");
+	} else if (desc && print_state->desc) {
+		fprintf(fp, "%*s", 8, "[");
+		wordwrap(fp, desc, 8, pager_get_columns(), 0);
+		fprintf(fp, "]\n");
 	}
 	if (expr && print_state->detailed) {
 		fprintf(fp, "%*s", 8, "[");
@@ -507,6 +504,7 @@ int cmd_list(int argc, const char **argv)
 	int i, ret = 0;
 	struct print_state default_ps = {
 		.fp = stdout,
+		.desc = true,
 	};
 	struct print_state json_ps = {
 		.fp = stdout,
@@ -579,7 +577,6 @@ int cmd_list(int argc, const char **argv)
 		};
 		ps = &json_ps;
 	} else {
-		default_ps.desc = !default_ps.long_desc;
 		default_ps.last_topic = strdup("");
 		assert(default_ps.last_topic);
 		default_ps.visited_metrics = strlist__new(NULL, NULL);