Actually scroll the terminal when we get to the end of it.

1 files changed, 8 insertions, 3 deletions

diff --git a/dumbsh.c b/dumbsh.c
index fe184dd..a4a475f 100644
--- a/dumbsh.c
+++ b/dumbsh.c
@@ -37,11 +37,16 @@ GLOBALS(
 
 static void updateLine()
 {
-  if (0 > TT.y)  TT.y = 0;
   if (0 > TT.x)  TT.x = 0;
   if (strlen(toybuf) <= TT.x)  TT.x = strlen(toybuf);
-  if (TT.h < TT.y)  TT.y = TT.h;
   if (TT.w < TT.x)  TT.x = TT.w;
+  if (0 > TT.y)  TT.y = 0;
+  if (TT.h < TT.y)
+  {
+    printf("\x1B[%d;0H\n", TT.y + 1);
+    fflush(stdout);
+    TT.y = TT.h;
+  }
   printf("\x1B[%d;0H%-*s\x1B[%d;%dH", TT.y + 1, TT.w, toybuf, TT.y + 1, TT.x + 1);
   fflush(stdout);
 }
@@ -141,7 +146,7 @@ static void startOfLine()
   updateLine();
 }
 
-// The key to command mappings.
+// The key to command mappings, Emacs style.
 static struct keyCommand simpleEmacsKeys[] =
 {
   {"BS",        backSpaceChar},