From 4a080bfc3f94d6875be8697edd17b29d8dd9a176 Mon Sep 17 00:00:00 2001
From: root <root@turin.home>
Date: Mon, 2 May 2022 00:19:34 +0100
Subject: [PATCH] Scroll top/bottom with Home and End keys

 * Allows the use of the Home/End keys in order to scroll to the top or
   bottom of the list of stocks.
---
 cmd/mop/main.go |  4 ++++
 screen.go       | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/cmd/mop/main.go b/cmd/mop/main.go
index 1368303..e280e48 100644
--- a/cmd/mop/main.go
+++ b/cmd/mop/main.go
@@ -114,6 +114,10 @@ loop:
 					} else if event.Key == termbox.KeyArrowDown || event.Ch == 'j' {
 						screen.IncreaseOffset(1, len(profile.Tickers))
 						redrawQuotesFlag = true
+					} else if event.Key == termbox.KeyHome {
+						screen.ScrollTop()
+					} else if event.Key == termbox.KeyEnd {
+						screen.ScrollBottom(len(profile.Tickers))
 					}
 				} else if lineEditor != nil {
 					if done := lineEditor.Handle(event); done {
diff --git a/screen.go b/screen.go
index b7c32fe..12e6a8a 100644
--- a/screen.go
+++ b/screen.go
@@ -106,6 +106,19 @@ func (screen *Screen) DecreaseOffset(n int) {
 	}
 }
 
+func (screen *Screen) ScrollTop() {
+	screen.offset = 0
+}
+
+func (screen *Screen) ScrollBottom(max int) {
+	bottom := max - screen.height + screen.headerLine
+	if bottom > 0 {
+		screen.offset = bottom
+	} else {
+		screen.offset = 0
+	}
+}
+
 // Draw accepts variable number of arguments and knows how to display the
 // market data, stock quotes, current time, and an arbitrary string.
 func (screen *Screen) Draw(objects ...interface{}) *Screen {