From b42c54e964aa22f5376ff3361e8a176c9515686c Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Sat, 25 Jun 2022 11:08:20 -0700
Subject: [PATCH] fix tabstops off by one

---
 src/terminal/Terminal.zig | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/terminal/Terminal.zig b/src/terminal/Terminal.zig
index 3e3c8c6a1..dd8c9d7b3 100644
--- a/src/terminal/Terminal.zig
+++ b/src/terminal/Terminal.zig
@@ -507,7 +507,7 @@ pub fn horizontalTab(self: *Terminal) !void {
         // If the last cursor position was a tabstop we return. We do
         // "last cursor position" because we want a space to be written
         // at the tabstop unless we're at the end (the while condition).
-        if (self.tabstops.get(self.cursor.x - 1)) return;
+        if (self.tabstops.get(self.cursor.x)) return;
     }
 }
 
@@ -515,7 +515,7 @@ pub fn horizontalTab(self: *Terminal) !void {
 /// TODO: test
 pub fn tabClear(self: *Terminal, cmd: csi.TabClear) void {
     switch (cmd) {
-        .current => self.tabstops.unset(self.cursor.x - 1),
+        .current => self.tabstops.unset(self.cursor.x),
         .all => self.tabstops.reset(0),
         else => log.warn("invalid or unknown tab clear setting: {}", .{cmd}),
     }
@@ -524,7 +524,7 @@ pub fn tabClear(self: *Terminal, cmd: csi.TabClear) void {
 /// Set a tab stop on the current cursor.
 /// TODO: test
 pub fn tabSet(self: *Terminal) void {
-    self.tabstops.set(self.cursor.x - 1);
+    self.tabstops.set(self.cursor.x);
 }
 
 /// Carriage return moves the cursor to the first column.