From 46db4623bca2f06b5afc196965eba6a879462de8 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Tue, 21 Jun 2022 15:50:44 -0700
Subject: [PATCH] OSC 133;C

---
 nix/devshell.nix     |  1 +
 src/terminal/osc.zig | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/nix/devshell.nix b/nix/devshell.nix
index 8066e1b6b..9846fac88 100644
--- a/nix/devshell.nix
+++ b/nix/devshell.nix
@@ -32,6 +32,7 @@
     # Testing
     gdb
     tracy
+    vttest
   ];
 
   buildInputs = [
diff --git a/src/terminal/osc.zig b/src/terminal/osc.zig
index 4321edd82..40ff85caf 100644
--- a/src/terminal/osc.zig
+++ b/src/terminal/osc.zig
@@ -32,6 +32,17 @@ pub const Command = union(enum) {
     /// or another prompt (OSC "133;P").
     prompt_end: void,
 
+    /// The OSC "133;C" command can be used to explicitly end
+    /// the input area and begin the output area.  However, some applications
+    /// don't provide a convenient way to emit that command.
+    /// That is why we also specify an implicit way to end the input area
+    /// at the end of the line. In the case of  multiple input lines: If the
+    /// cursor is on a fresh (empty) line and we see either OSC "133;P" or
+    /// OSC "133;I" then this is the start of a continuation input line.
+    /// If we see anything else, it is the start of the output area (or end
+    /// of command).
+    end_of_input: void,
+
     /// End of current command.
     ///
     /// The exit-code need not be specified if  if there are no options,
@@ -203,6 +214,12 @@ pub const Parser = struct {
                     self.complete = true;
                 },
 
+                'C' => {
+                    self.state = .semantic_option_start;
+                    self.command = .{ .end_of_input = .{} };
+                    self.complete = true;
+                },
+
                 'D' => {
                     self.state = .semantic_exit_code_start;
                     self.command = .{ .end_of_command = .{} };
@@ -399,6 +416,18 @@ test "OSC: prompt_end" {
     try testing.expect(cmd == .prompt_end);
 }
 
+test "OSC: end_of_input" {
+    const testing = std.testing;
+
+    var p: Parser = .{};
+
+    const input = "133;C";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end().?;
+    try testing.expect(cmd == .end_of_input);
+}
+
 test "OSC: reset_cursor_color" {
     const testing = std.testing;