[tip: perf/core] perf report/top: Allow pressing hotkeys in the options popup menu

[tip-bot2 for Arnaldo Carvalho de Melo]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     4c8b9c0f4281c8517542c26425aade3a31988575
Gitweb:        https://git.kernel.org/tip/4c8b9c0f4281c8517542c26425aade3a31988575
Author:        Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate:    Mon, 16 Dec 2019 13:27:47 -03:00
Committer:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Mon, 06 Jan 2020 11:46:10 -03:00

perf report/top: Allow pressing hotkeys in the options popup menu

When the users presses ENTER in the main 'perf report/top' screen a
popup menu is presented, in it some hotkeys are suggested as
alternatives to using the menu, or for additional features.

At that point the user may try those hotkeys, so allow for that by
recording the key used and exiting, the caller then can check for that
possibility and process the hotkey.

I.e. try pressing ENTER, and then 'k' to exit and zoom into the kernel
map, using ESC then zooms out, etc.

Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-ujfq3fw44kf6qrtfajl5dcsp@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/ui/browsers/hists.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index c44b508..8776b1c 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -2995,12 +2995,13 @@ static int perf_evsel__hists_browse(struct evsel *evsel, int nr_events,
 	while (1) {
 		struct thread *thread = NULL;
 		struct map *map = NULL;
-		int choice = 0;
+		int choice;
 		int socked_id = -1;
 
-		nr_options = 0;
-
-		key = hist_browser__run(browser, helpline, warn_lost_event, 0);
+		key = 0; // reset key
+do_hotkey:		 // key came straight from options ui__popup_menu()
+		choice = nr_options = 0;
+		key = hist_browser__run(browser, helpline, warn_lost_event, key);
 
 		if (browser->he_selection != NULL) {
 			thread = hist_browser__selected_thread(browser);
@@ -3279,10 +3280,13 @@ skip_scripting:
 		do {
 			struct popup_action *act;
 
-			choice = ui__popup_menu(nr_options, options, NULL);
-			if (choice == -1 || choice >= nr_options)
+			choice = ui__popup_menu(nr_options, options, &key);
+			if (choice == -1)
 				break;
 
+			if (choice == nr_options)
+				goto do_hotkey;
+
 			act = &actions[choice];
 			key = act->fn(browser, act);
 		} while (key == 1);