perf report: Add a popup menu to ask what operation is to be performed

Right now it presents a menu with these options:

 +------------------------------+
 | Annotate CURRENT_SYMBOL_NAME |
 | Exit                         |
 +------------------------------+

If the highlighted (current) symbol is not annotatable only the
"Exit" option will appear.

Also add a confirmation dialog when ESC is pressed on the top
level to avoid exiting the application by pressing one too many
ESC key.

To get to the menu just press the -> (Right navigation key), to
exit just press ESC.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1269459619-982-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/util/newt.c b/tools/perf/util/newt.c
index 12b229b..a3465a0 100644 (file)
--- a/tools/perf/util/newt.c
+++ b/tools/perf/util/newt.c
@@ -28,6 +28,47 @@ static newtComponent newt_form__new(void)
        return self;
 }
 
+static int popup_menu(int argc, const char *argv[])
+{
+       struct newtExitStruct es;
+       int i, rc = -1, max_len = 5;
+       newtComponent listbox, form = newt_form__new();
+
+       if (form == NULL)
+               return -1;
+
+       listbox = newtListbox(0, 0, argc, NEWT_FLAG_RETURNEXIT);
+       if (listbox == NULL)
+               goto out_destroy_form;
+
+       newtFormAddComponents(form, listbox, NULL);
+
+       for (i = 0; i < argc; ++i) {
+               int len = strlen(argv[i]);
+               if (len > max_len)
+                       max_len = len;
+               if (newtListboxAddEntry(listbox, argv[i], (void *)(long)i))
+                       goto out_destroy_form;
+       }
+
+       newtCenteredWindow(max_len, argc, NULL);
+       newtFormRun(form, &es);
+       rc = newtListboxGetCurrent(listbox) - NULL;
+       if (es.reason == NEWT_EXIT_HOTKEY)
+               rc = -1;
+       newtPopWindow();
+out_destroy_form:
+       newtFormDestroy(form);
+       return rc;
+}
+
+static bool dialog_yesno(const char *msg)
+{
+       /* newtWinChoice should really be accepting const char pointers... */
+       char yes[] = "Yes", no[] = "No";
+       return newtWinChoice(NULL, no, yes, (char *)msg) == 2;
+}
+
 /*
  * When debugging newt problems it was useful to be able to "unroll"
  * the calls to newtCheckBoxTreeAdd{Array,Item}, so that we can generate
@@ -309,6 +350,19 @@ out_free_str:
        free(str);
 }
 
+static const void *newt__symbol_tree_get_current(newtComponent self)
+{
+       if (symbol_conf.use_callchain)
+               return newtCheckboxTreeGetCurrent(self);
+       return newtListboxGetCurrent(self);
+}
+
+static void perf_session__selection(newtComponent self, void *data)
+{
+       const struct symbol **symbol_ptr = data;
+       *symbol_ptr = newt__symbol_tree_get_current(self);
+}
+
 void perf_session__browse_hists(struct rb_root *hists, u64 session_total,
                                const char *helpline)
 {
@@ -322,6 +376,7 @@ void perf_session__browse_hists(struct rb_root *hists, u64 session_total,
        char str[1024];
        newtComponent form, tree;
        struct newtExitStruct es;
+       const struct symbol *selection;
 
        snprintf(str, sizeof(str), "Samples: %Ld", session_total);
        newtDrawRootText(0, 0, str);
@@ -336,6 +391,8 @@ void perf_session__browse_hists(struct rb_root *hists, u64 session_total,
                tree = newtListbox(0, 0, rows - 5, (NEWT_FLAG_SCROLL |
                                                       NEWT_FLAG_RETURNEXIT));
 
+       newtComponentAddCallback(tree, perf_session__selection, &selection);
+
        list_for_each_entry(se, &hist_entry__sort_list, list) {
                if (se->elide)
                        continue;
@@ -377,20 +434,43 @@ void perf_session__browse_hists(struct rb_root *hists, u64 session_total,
        form = newt_form__new();
        newtFormAddHotKey(form, 'A');
        newtFormAddHotKey(form, 'a');
+       newtFormAddHotKey(form, NEWT_KEY_RIGHT);
        newtFormAddComponents(form, tree, NULL);
+       selection = newt__symbol_tree_get_current(tree);
 
        while (1) {
-               const struct symbol *selection;
+               char annotate[512];
+               const char *options[2];
+               int nr_options = 0, choice;
 
                newtFormRun(form, &es);
-               if (es.reason == NEWT_EXIT_HOTKEY &&
-                   toupper(es.u.key) != 'A')
+               if (es.reason == NEWT_EXIT_HOTKEY) {
+                       if (toupper(es.u.key) == 'A') {
+                               symbol__annotate_browser(selection);
+                               continue;
+                       }
+                       if (es.u.key == NEWT_KEY_ESCAPE ||
+                           toupper(es.u.key) == 'Q' ||
+                           es.u.key == CTRL('c')) {
+                               if (dialog_yesno("Do you really want to exit?"))
+                                       break;
+                               else
+                                       continue;
+                       }
+               }
+
+               if (selection != NULL) {
+                       snprintf(annotate, sizeof(annotate),
+                                "Annotate %s", selection->name);
+                       options[nr_options++] = annotate;
+               }
+
+               options[nr_options++] = "Exit";
+               choice = popup_menu(nr_options, options);
+               if (choice == nr_options - 1)
                        break;
-               if (!symbol_conf.use_callchain)
-                       selection = newtListboxGetCurrent(tree);
-               else
-                       selection = newtCheckboxTreeGetCurrent(tree);
-               symbol__annotate_browser(selection);
+               else if (selection != NULL && choice >= 0)
+                       symbol__annotate_browser(selection);
        }
 
        newtFormDestroy(form);