perf ui browser: Add method to draw up/down arrow line

It figures out the direction and draws downwards arrows too if that is
the case.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-tg329nr7q4dg9d0tl3o0wywg@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 54 insertions, 4 deletions

diff --git a/tools/perf/ui/browser.c b/tools/perf/ui/browser.c
index 32ac1165100..f4b2530ae1d 100644
--- a/tools/perf/ui/browser.c
+++ b/tools/perf/ui/browser.c
@@ -600,8 +600,9 @@ void ui_browser__write_graph(struct ui_browser *browser __used, int graph)
         SLsmg_set_char_set(0);
 }
 
-void __ui_browser__line_arrow_up(struct ui_browser *browser, unsigned int column,
-                                 u64 start, u64 end, int start_width)
+static void __ui_browser__line_arrow_up(struct ui_browser *browser,
+                                        unsigned int column,
+                                        u64 start, u64 end, int start_width)
 {
         unsigned int row, end_row;
 
@@ -639,6 +640,55 @@ out:
         SLsmg_set_char_set(0);
 }
 
+static void __ui_browser__line_arrow_down(struct ui_browser *browser,
+                                          unsigned int column,
+                                          u64 start, u64 end, int start_width)
+{
+        unsigned int row, end_row;
+
+        SLsmg_set_char_set(1);
+
+        if (start >= browser->top_idx) {
+                row = start - browser->top_idx;
+                ui_browser__gotorc(browser, row, column);
+                SLsmg_write_char(SLSMG_ULCORN_CHAR);
+                ui_browser__gotorc(browser, row, column + 1);
+                SLsmg_draw_hline(start_width);
+
+                if (row++ == 0)
+                        goto out;
+        } else
+                row = 0;
+
+        if (end >= browser->top_idx + browser->height)
+                end_row = browser->height - 1;
+        else
+                end_row = end - browser->top_idx;;
+
+        ui_browser__gotorc(browser, row, column);
+        SLsmg_draw_vline(end_row - row + 1);
+
+        ui_browser__gotorc(browser, end_row, column);
+        if (end < browser->top_idx + browser->height) {
+                SLsmg_write_char(SLSMG_LLCORN_CHAR);
+                ui_browser__gotorc(browser, end_row, column + 1);
+                SLsmg_write_char(SLSMG_HLINE_CHAR);
+                ui_browser__gotorc(browser, end_row, column + 2);
+                SLsmg_write_char(SLSMG_RARROW_CHAR);
+        }
+out:
+        SLsmg_set_char_set(0);
+}
+
+void __ui_browser__line_arrow(struct ui_browser *browser, unsigned int column,
+                              u64 start, u64 end, int start_width)
+{
+        if (start > end)
+                __ui_browser__line_arrow_up(browser, column, start, end, start_width);
+        else
+                __ui_browser__line_arrow_down(browser, column, start, end, start_width);
+}
+
 void ui_browser__init(void)
 {
         int i = 0;
diff --git a/tools/perf/ui/browser.h b/tools/perf/ui/browser.h
index 2f226cb79f6..059764b29b2 100644
--- a/tools/perf/ui/browser.h
+++ b/tools/perf/ui/browser.h
@@ -38,8 +38,8 @@ void ui_browser__reset_index(struct ui_browser *self);
 
 void ui_browser__gotorc(struct ui_browser *self, int y, int x);
 void ui_browser__write_graph(struct ui_browser *browser, int graph);
-void __ui_browser__line_arrow_up(struct ui_browser *browser, unsigned int column,
-                                 u64 start, u64 end, int start_width);
+void __ui_browser__line_arrow(struct ui_browser *browser, unsigned int column,
+                              u64 start, u64 end, int start_width);
 void __ui_browser__show_title(struct ui_browser *browser, const char *title);
 void ui_browser__show_title(struct ui_browser *browser, const char *title);
 int ui_browser__show(struct ui_browser *self, const char *title,