perf tui: Add help window to show key associations

Suggested-by: Ingo Molnar <mingo@elte.hu>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/tools/perf/util/newt.c b/tools/perf/util/newt.c
index 59a63e4405fc..2001d26a5579 100644
--- a/tools/perf/util/newt.c
+++ b/tools/perf/util/newt.c
@@ -167,6 +167,48 @@ out_destroy_form:
         return rc;
 }
 
+static int ui__help_window(const char *text)
+{
+        struct newtExitStruct es;
+        newtComponent tb, form = newt_form__new();
+        int rc = -1;
+        int max_len = 0, nr_lines = 0;
+        const char *t;
+
+        if (form == NULL)
+                return -1;
+
+        t = text;
+        while (1) {
+                const char *sep = strchr(t, '\n');
+                int len;
+
+                if (sep == NULL)
+                        sep = strchr(t, '\0');
+                len = sep - t;
+                if (max_len < len)
+                        max_len = len;
+                ++nr_lines;
+                if (*sep == '\0')
+                        break;
+                t = sep + 1;
+        }
+
+        tb = newtTextbox(0, 0, max_len, nr_lines, 0);
+        if (tb == NULL)
+                goto out_destroy_form;
+
+        newtTextboxSetText(tb, text);
+        newtFormAddComponent(form, tb);
+        newtCenteredWindow(max_len, nr_lines, NULL);
+        newtFormRun(form, &es);
+        newtPopWindow();
+        rc = 0;
+out_destroy_form:
+        newtFormDestroy(form);
+        return rc;
+}
+
 static bool dialog_yesno(const char *msg)
 {
         /* newtWinChoice should really be accepting const char pointers... */
@@ -756,6 +798,10 @@ static int hist_browser__populate(struct hist_browser *self, struct hists *hists
         newtFormAddHotKey(self->form, 'd');
         newtFormAddHotKey(self->form, 'T');
         newtFormAddHotKey(self->form, 't');
+        newtFormAddHotKey(self->form, '?');
+        newtFormAddHotKey(self->form, 'H');
+        newtFormAddHotKey(self->form, 'h');
+        newtFormAddHotKey(self->form, NEWT_KEY_F1);
         newtFormAddHotKey(self->form, NEWT_KEY_RIGHT);
         newtFormAddComponents(self->form, self->tree, NULL);
         self->selection = newt__symbol_tree_get_current(self->tree);
@@ -842,6 +888,9 @@ int hists__browse(struct hists *self, const char *helpline, const char *input_na
                 dso = browser->selection->map ? browser->selection->map->dso : NULL;
 
                 if (es.reason == NEWT_EXIT_HOTKEY) {
+                        if (es.u.key == NEWT_KEY_F1)
+                                goto do_help;
+
                         switch (toupper(es.u.key)) {
                         case 'A':
                                 goto do_annotate;
@@ -849,6 +898,17 @@ int hists__browse(struct hists *self, const char *helpline, const char *input_na
                                 goto zoom_dso;
                         case 'T':
                                 goto zoom_thread;
+                        case 'H':
+                        case '?':
+do_help:
+                                ui__help_window("->        Zoom into DSO/Threads & Annotate current symbol\n"
+                                                "<-        Zoom out\n"
+                                                "a         Annotate current symbol\n"
+                                                "h/?/F1    Show this window\n"
+                                                "d         Zoom into current DSO\n"
+                                                "t         Zoom into current Thread\n"
+                                                "q/CTRL+C  Exit browser");
+                                continue;
                         default:;
                         }
                         if (toupper(es.u.key) == 'Q' ||