[PATCH 4/3] perf report: Show error message for incompatible UI request

[Namhyung Kim <namhyung@kernel.org>]

Currently --header, --header-only and --threads/-T options are supported
on stdio mode only.  Show warning if user passes one of --tui or --gtk
option with these like below:

  $ perf report -T --tui
  Error: --threads option cannot be used with --tui

   usage: perf report [<options>]

          -T, --threads     Show per-thread event counters
          --tui             Use the TUI interface

Requested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/builtin-report.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 08a4246d6b62..6ac2c7a01a63 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -815,9 +815,24 @@ repeat:
 	}
 
 	/* Force tty output for header output and per-thread stat. */
-	if (report.header || report.header_only || report.show_threads)
+	if (report.header || report.header_only || report.show_threads) {
 		use_browser = 0;
 
+		if (report.use_tui || report.use_gtk) {
+			pr_err("Error: %s option cannot be used with %s\n",
+			       report.header_only ? "--header-only" :
+			       report.header ? "--header" : "--threads",
+			       report.use_tui ? "--tui" : "--gtk");
+
+			parse_options_usage(report_usage, options,
+					    report.header_only ? "header-only" :
+					    report.header ? "header": "threads", 0);
+			parse_options_usage(NULL, options,
+					    report.use_tui ? "tui" : "gtk", 0);
+			goto error;
+		}
+	}
+
 	if (strcmp(input_name, "-") != 0)
 		setup_browser(true);
 	else
-- 
2.4.0