From 66b92c84b096b47ce31aa554bd41cbbd1fa89f6a Mon Sep 17 00:00:00 2001
From: JEEVITHA KANNAN K S <ksjeevithakannan123@gmail.com>
Date: Tue, 1 Oct 2024 02:16:05 +0530
Subject: [PATCH] feat: Add scroll (#643)

* Add scroll

* Update running_command.rs

* Add hints, Up and Down to terminal
---
 tui/src/running_command.rs | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/tui/src/running_command.rs b/tui/src/running_command.rs
index 366a3dc3..ce7bee02 100644
--- a/tui/src/running_command.rs
+++ b/tui/src/running_command.rs
@@ -37,6 +37,7 @@ pub struct RunningCommand {
     writer: Box<dyn Write + Send>,
     /// Only set after the process has ended
     status: Option<ExitStatus>,
+    scroll_offset: usize,
 }
 
 impl FloatContent for RunningCommand {
@@ -102,6 +103,12 @@ impl FloatContent for RunningCommand {
             KeyCode::Enter if self.is_finished() => {
                 return true;
             }
+            KeyCode::PageUp => {
+                self.scroll_offset = self.scroll_offset.saturating_add(10);
+            }
+            KeyCode::PageDown => {
+                self.scroll_offset = self.scroll_offset.saturating_sub(10);
+            }
             // Pass other key events to the terminal
             _ => self.handle_passthrough_key_event(key),
         }
@@ -121,12 +128,20 @@ impl FloatContent for RunningCommand {
         if self.is_finished() {
             (
                 "Finished command",
-                Box::new([Shortcut::new("Close window", ["Enter", "q"])]),
+                Box::new([
+                    Shortcut::new("Close window", ["Enter", "q"]),
+                    Shortcut::new("Scroll up", ["Page up"]),
+                    Shortcut::new("Scroll down", ["Page down"]),
+                ]),
             )
         } else {
             (
                 "Running command",
-                Box::new([Shortcut::new("Kill the command", ["CTRL-c"])]),
+                Box::new([
+                    Shortcut::new("Kill the command", ["CTRL-c"]),
+                    Shortcut::new("Scroll up", ["Page up"]),
+                    Shortcut::new("Scroll down", ["Page down"]),
+                ]),
             )
         }
     }
@@ -220,6 +235,7 @@ impl RunningCommand {
             pty_master: pair.master,
             writer,
             status: None,
+            scroll_offset: 0,
         }
     }
 
@@ -237,10 +253,12 @@ impl RunningCommand {
         // Process the buffer with a parser with the current screen size
         // We don't actually need to create a new parser every time, but it is so much easier this
         // way, and doesn't cost that much
-        let mut parser = vt100::Parser::new(size.height, size.width, 0);
+        let mut parser = vt100::Parser::new(size.height, size.width, 200);
         let mutex = self.buffer.lock();
         let buffer = mutex.as_ref().unwrap();
         parser.process(buffer);
+        // Adjust the screen content based on the scroll offset
+        parser.set_scrollback(self.scroll_offset);
         parser.screen().clone()
     }
 
@@ -297,8 +315,6 @@ impl RunningCommand {
             KeyCode::Tab => vec![9],
             KeyCode::Home => vec![27, 91, 72],
             KeyCode::End => vec![27, 91, 70],
-            KeyCode::PageUp => vec![27, 91, 53, 126],
-            KeyCode::PageDown => vec![27, 91, 54, 126],
             KeyCode::BackTab => vec![27, 91, 90],
             KeyCode::Delete => vec![27, 91, 51, 126],
             KeyCode::Insert => vec![27, 91, 50, 126],