From a19c0a5989c45ced8460284fe6591bebe08d22ac Mon Sep 17 00:00:00 2001
From: James Booth <boothj5@gmail.com>
Date: Sat, 31 Jan 2015 22:29:44 +0000
Subject: [PATCH] Added scroll handler

---
 src/ui/inputwin.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/ui/inputwin.c b/src/ui/inputwin.c
index 083b6c4e..ee800e56 100644
--- a/src/ui/inputwin.c
+++ b/src/ui/inputwin.c
@@ -365,6 +365,26 @@ inp_block(void)
     wtimeout(inp_win, -1);
 }
 
+void
+inp_win_handle_scroll(void)
+{
+    int col = getcurx(inp_win);
+    int wcols = getmaxx(stdscr);
+
+    // if lost cursor off screen, move contents to show it
+    if (col >= pad_start + (wcols -2)) {
+        pad_start = col - (wcols / 2);
+        if (pad_start < 0) {
+            pad_start = 0;
+        }
+    } else if (col <= pad_start) {
+        pad_start = pad_start - (wcols / 2);
+        if (pad_start < 0) {
+            pad_start = 0;
+        }
+    }
+}
+
 void
 inp_write(char *line, int offset)
 {
@@ -372,6 +392,8 @@ inp_write(char *line, int offset)
     werase(inp_win);
     waddstr(inp_win, line);
     wmove(inp_win, 0, col);
+    inp_win_handle_scroll();
+
     _inp_win_update_virtual();
 }