terminal: CUF handles right margin

src/terminal/Terminal.zig

@@ -1439,16 +1439,21 @@ pub fn cursorLeft(self: *Terminal, count_req: usize) void {
 /// maximum move distance then it is internally adjusted to the maximum.
 /// This sequence will not scroll the screen or scroll region. If amount is
 /// 0, adjust it to 1.
-/// TODO: test
+pub fn cursorRight(self: *Terminal, count_req: usize) void {
-pub fn cursorRight(self: *Terminal, count: usize) void {
     const tracy = trace(@src());
     defer tracy.end();
 
-    self.screen.cursor.x += if (count == 0) 1 else count;
+    // Always resets pending wrap
     self.screen.cursor.pending_wrap = false;
-    if (self.screen.cursor.x >= self.cols) {
+
-        self.screen.cursor.x = self.cols - 1;
+    // The max the cursor can move to depends where the cursor currently is
-    }
+    const max = if (self.screen.cursor.x <= self.scrolling_region.right)
+        self.scrolling_region.right
+    else
+        self.cols - 1;
+
+    const count = @max(count_req, 1);
+    self.screen.cursor.x = @min(max, self.screen.cursor.x +| count);
 }
 
 /// Move the cursor down amount lines. If amount is greater than the maximum
@@ -4044,3 +4049,69 @@ test "Terminal: cursorUp resets wrap" {
         try testing.expectEqualStrings("ABCDX", str);
     }
 }
+
+test "Terminal: cursorRight resets wrap" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 5, 5);
+    defer t.deinit(alloc);
+
+    for ("ABCDE") |c| try t.print(c);
+    try testing.expect(t.screen.cursor.pending_wrap);
+    t.cursorRight(1);
+    try testing.expect(!t.screen.cursor.pending_wrap);
+    try t.print('X');
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("ABCDX", str);
+    }
+}
+
+test "Terminal: cursorRight to the edge of screen" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 5, 5);
+    defer t.deinit(alloc);
+
+    t.cursorRight(100);
+    try t.print('X');
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("    X", str);
+    }
+}
+
+test "Terminal: cursorRight left of right margin" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 5, 5);
+    defer t.deinit(alloc);
+
+    t.scrolling_region.right = 2;
+    t.cursorRight(100);
+    try t.print('X');
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("  X", str);
+    }
+}
+
+test "Terminal: cursorRight right of right margin" {
+    const alloc = testing.allocator;
+    var t = try init(alloc, 5, 5);
+    defer t.deinit(alloc);
+
+    t.scrolling_region.right = 2;
+    t.screen.cursor.x = 3;
+    t.cursorRight(100);
+    try t.print('X');
+
+    {
+        var str = try t.plainString(testing.allocator);
+        defer testing.allocator.free(str);
+        try testing.expectEqualStrings("    X", str);
+    }
+}

website/app/vt/cuf/page.mdx

@@ -0,0 +1,83 @@
+import VTSequence from "@/components/VTSequence";
+
+# Cursor Forward (CUF)
+
+<VTSequence sequence={["CSI", "Pn", "C"]} />
+
+Move the cursor `n` cells right.
+
+The parameter `n` must be an integer greater than or equal to 1. If `n` is less than
+or equal to 0, adjust `n` to be 1. If `n` is omitted, `n` defaults to 1.
+
+This sequence always unsets the pending wrap state.
+
+The rightmost boundary the cursor can move to is determined by the current
+cursor column and the [right margin](#TODO). If the cursor begins to the right
+of the right margin, modify the right margin to be the rightmost column
+of the screen for the duration of the sequence. The rightmost column the cursor
+can be on is the right margin.
+
+Move the cursor `n` cells to the right up to and including the rightmost boundary.
+This sequence never wraps or modifies cell content. This sequence is not affected
+by any terminal modes.
+
+## Validation
+
+### CUF V-1: Pending Wrap is Unset
+
+```bash
+cols=$(tput cols)
+printf "\033[${cols}G" # move to last column
+printf "A" # set pending wrap state
+printf "\033[C" # move forward one
+printf "XYZ"
+```
+
+```
+|_________X|
+|YZ________|
+```
+
+### CUF V-2: Rightmost Boundary with Reverse Wrap Disabled
+
+```bash
+printf "A"
+printf "\033[500C" # forward larger than screen width
+printf "B"
+```
+
+```
+|A________Bc
+```
+
+### CUF V-3: Left of the Right Margin
+
+```bash
+printf "\033[1;1H" # move to top-left
+printf "\033[0J" # clear screen
+printf "\033[?69h" # enable left/right margins
+printf "\033[3;5s" # scroll region left/right
+printf "\033[1G" # move to left
+printf "\033[500C" # forward larger than screen width
+printf "X"
+```
+
+```
+|____X_____|
+```
+
+### CUF V-4: Right of the Right Margin
+
+```bash
+printf "\033[1;1H" # move to top-left
+printf "\033[0J" # clear screen
+printf "\033[?69h" # enable left/right margins
+printf "\033[3;5s" # scroll region left/right
+printf "\033[6G" # move to right of margin
+printf "\033[500C" # forward larger than screen width
+printf "X"
+```
+
+```
+|_________X|
+```