fix pageup/pagedown seeking through twitter events

2 files changed, 4 insertions, 3 deletions

diff --git a/src/display/mod.rs b/src/display/mod.rs
index 1c26678..8760f4a 100644
--- a/src/display/mod.rs
+++ b/src/display/mod.rs
@@ -108,8 +108,9 @@ pub fn paint(tweeter: &mut ::tw::TwitterCache) -> Result<(), std::io::Error> {
             }
             // draw status lines
             // draw tweets
-            let last_twevent = tweeter.display_info.infos.len().saturating_sub(height as usize - 4).saturating_sub(tweeter.display_info.infos_seek as usize);
-            let last_few_twevent: Vec<Infos> = tweeter.display_info.infos[last_twevent..].iter().map(|x| x.clone()).rev().collect::<Vec<Infos>>();
+            let last_tail_twevent = tweeter.display_info.infos.len().saturating_sub(tweeter.display_info.infos_seek as usize);
+            let first_tail_twevent = last_tail_twevent.saturating_sub(height as usize - 4);
+            let last_few_twevent: Vec<Infos> = tweeter.display_info.infos[first_tail_twevent..last_tail_twevent].iter().map(|x| x.clone()).rev().collect::<Vec<Infos>>();
 
             let mut h = tweeter.display_info.ui_height();
 
diff --git a/src/main.rs b/src/main.rs
index 6bed875..ecac646 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -324,7 +324,7 @@ fn handle_input(event: termion::event::Event, tweeter: &mut tw::TwitterCache, qu
             }
         },
         Event::Key(Key::PageUp) => {
-            tweeter.display_info.infos_seek += 1;
+            tweeter.display_info.infos_seek = tweeter.display_info.infos_seek.saturating_add(1);
         }
         Event::Key(Key::PageDown) => {
             tweeter.display_info.infos_seek = tweeter.display_info.infos_seek.saturating_sub(1);