perf ui/tui: Implement header window

Implement a simple, full-screen header window which shows session header
(metadata) information.  Press 'i' key to display the header window.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1388036284-32342-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 136 insertions, 0 deletions

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 97a2145e4cc6..3638b0bd20dc 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -489,6 +489,7 @@ ifndef NO_SLANG
   LIB_OBJS += $(OUTPUT)ui/browsers/hists.o
   LIB_OBJS += $(OUTPUT)ui/browsers/map.o
   LIB_OBJS += $(OUTPUT)ui/browsers/scripts.o
+  LIB_OBJS += $(OUTPUT)ui/browsers/header.o
   LIB_OBJS += $(OUTPUT)ui/tui/setup.o
   LIB_OBJS += $(OUTPUT)ui/tui/util.o
   LIB_OBJS += $(OUTPUT)ui/tui/helpline.o
diff --git a/tools/perf/ui/browser.h b/tools/perf/ui/browser.h
index 7d45d2f53601..118cca29dd26 100644
--- a/tools/perf/ui/browser.h
+++ b/tools/perf/ui/browser.h
@@ -59,6 +59,8 @@ int ui_browser__help_window(struct ui_browser *browser, const char *text);
 bool ui_browser__dialog_yesno(struct ui_browser *browser, const char *text);
 int ui_browser__input_window(const char *title, const char *text, char *input,
                              const char *exit_msg, int delay_sec);
+struct perf_session_env;
+int tui__header_window(struct perf_session_env *env);
 
 void ui_browser__argv_seek(struct ui_browser *browser, off_t offset, int whence);
 unsigned int ui_browser__argv_refresh(struct ui_browser *browser);
diff --git a/tools/perf/ui/browsers/header.c b/tools/perf/ui/browsers/header.c
new file mode 100644
index 000000000000..89c16b988618
--- /dev/null
+++ b/tools/perf/ui/browsers/header.c
@@ -0,0 +1,127 @@
+#include "util/cache.h"
+#include "util/debug.h"
+#include "ui/browser.h"
+#include "ui/ui.h"
+#include "ui/util.h"
+#include "ui/libslang.h"
+#include "util/header.h"
+#include "util/session.h"
+
+static void ui_browser__argv_write(struct ui_browser *browser,
+                                   void *entry, int row)
+{
+        char **arg = entry;
+        char *str = *arg;
+        char empty[] = " ";
+        bool current_entry = ui_browser__is_current_entry(browser, row);
+        unsigned long offset = (unsigned long)browser->priv;
+
+        if (offset >= strlen(str))
+                str = empty;
+        else
+                str = str + offset;
+
+        ui_browser__set_color(browser, current_entry ? HE_COLORSET_SELECTED :
+                                                       HE_COLORSET_NORMAL);
+
+        slsmg_write_nstring(str, browser->width);
+}
+
+static int list_menu__run(struct ui_browser *menu)
+{
+        int key;
+        unsigned long offset;
+        const char help[] =
+        "h/?/F1        Show this window\n"
+        "UP/DOWN/PGUP\n"
+        "PGDN/SPACE\n"
+        "LEFT/RIGHT    Navigate\n"
+        "q/ESC/CTRL+C  Exit browser";
+
+        if (ui_browser__show(menu, "Header information", "Press 'q' to exit") < 0)
+                return -1;
+
+        while (1) {
+                key = ui_browser__run(menu, 0);
+
+                switch (key) {
+                case K_RIGHT:
+                        offset = (unsigned long)menu->priv;
+                        offset += 10;
+                        menu->priv = (void *)offset;
+                        continue;
+                case K_LEFT:
+                        offset = (unsigned long)menu->priv;
+                        if (offset >= 10)
+                                offset -= 10;
+                        menu->priv = (void *)offset;
+                        continue;
+                case K_F1:
+                case 'h':
+                case '?':
+                        ui_browser__help_window(menu, help);
+                        continue;
+                case K_ESC:
+                case 'q':
+                case CTRL('c'):
+                        key = -1;
+                        break;
+                default:
+                        continue;
+                }
+
+                break;
+        }
+
+        ui_browser__hide(menu);
+        return key;
+}
+
+static int ui__list_menu(int argc, char * const argv[])
+{
+        struct ui_browser menu = {
+                .entries    = (void *)argv,
+                .refresh    = ui_browser__argv_refresh,
+                .seek       = ui_browser__argv_seek,
+                .write      = ui_browser__argv_write,
+                .nr_entries = argc,
+        };
+
+        return list_menu__run(&menu);
+}
+
+int tui__header_window(struct perf_session_env *env)
+{
+        int i, argc = 0;
+        char **argv;
+        struct perf_session *session;
+        char *ptr, *pos;
+        size_t size;
+        FILE *fp = open_memstream(&ptr, &size);
+
+        session = container_of(env, struct perf_session, header.env);
+        perf_header__fprintf_info(session, fp, true);
+        fclose(fp);
+
+        for (pos = ptr, argc = 0; (pos = strchr(pos, '\n')) != NULL; pos++)
+                argc++;
+
+        argv = calloc(argc + 1, sizeof(*argv));
+        if (argv == NULL)
+                goto out;
+
+        argv[0] = pos = ptr;
+        for (i = 1; (pos = strchr(pos, '\n')) != NULL; i++) {
+                *pos++ = '\0';
+                argv[i] = pos;
+        }
+
+        BUG_ON(i != argc + 1);
+
+        ui__list_menu(argc, argv);
+
+out:
+        free(argv);
+        free(ptr);
+        return 0;
+}
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index d43ec79ea4e3..0d9dd99507ee 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1417,6 +1417,7 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 
         /* help messages are sorted by lexical order of the hotkey */
         const char report_help[] = HIST_BROWSER_HELP_COMMON
+        "i             Show header information\n"
         "P             Print histograms to perf.hist.N\n"
         "r             Run available scripts\n"
         "s             Switch to another data file in PWD\n"
@@ -1513,6 +1514,11 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
                         if (is_report_browser(hbt))
                                 goto do_data_switch;
                         continue;
+                case 'i':
+                        /* env->arch is NULL for live-mode (i.e. perf top) */
+                        if (env->arch)
+                                tui__header_window(env);
+                        continue;
                 case K_F1:
                 case 'h':
                 case '?':