From 39c0f79b8da5f1b914fe450c200bacb448e2fc56 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <m@mitchellh.com>
Date: Fri, 23 Jan 2026 13:35:13 -0800
Subject: [PATCH] terminal/osc: semantic prompt 'P'

---
 src/terminal/osc/parsers/semantic_prompt2.zig | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)

diff --git a/src/terminal/osc/parsers/semantic_prompt2.zig b/src/terminal/osc/parsers/semantic_prompt2.zig
index e3cdb815f..b46157692 100644
--- a/src/terminal/osc/parsers/semantic_prompt2.zig
+++ b/src/terminal/osc/parsers/semantic_prompt2.zig
@@ -8,6 +8,7 @@ const log = std.log.scoped(.osc_semantic_prompt);
 pub const Command = union(enum) {
     fresh_line,
     fresh_line_new_prompt: Options,
+    prompt_start: Options,
 };
 
 pub const Options = struct {
@@ -103,6 +104,14 @@ pub fn parse(parser: *Parser, _: ?u8) ?*OSCCommand {
                 parser.command = .{ .semantic_prompt = .fresh_line };
             },
 
+            'P' => prompt_start: {
+                parser.command = .{ .semantic_prompt = .{ .prompt_start = .init } };
+                if (data.len == 1) break :prompt_start;
+                if (data[1] != ';') break :valid;
+                var it = KVIterator.init(writer) catch break :valid;
+                parser.command.semantic_prompt.prompt_start.parse(&it);
+            },
+
             else => break :valid,
         }
 
@@ -348,3 +357,96 @@ test "OSC 133: fresh_line_new_prompt with multiple options" {
     try testing.expectEqualStrings("foo", cmd.semantic_prompt.fresh_line_new_prompt.aid.?);
     try testing.expect(cmd.semantic_prompt.fresh_line_new_prompt.cl == .line);
 }
+
+test "OSC 133: prompt_start" {
+    const testing = std.testing;
+
+    var p: Parser = .init(null);
+
+    const input = "133;P";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end(null).?.*;
+    try testing.expect(cmd == .semantic_prompt);
+    try testing.expect(cmd.semantic_prompt == .prompt_start);
+    try testing.expect(cmd.semantic_prompt.prompt_start.prompt_kind == null);
+}
+
+test "OSC 133: prompt_start with k=i" {
+    const testing = std.testing;
+
+    var p: Parser = .init(null);
+
+    const input = "133;P;k=i";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end(null).?.*;
+    try testing.expect(cmd == .semantic_prompt);
+    try testing.expect(cmd.semantic_prompt == .prompt_start);
+    try testing.expect(cmd.semantic_prompt.prompt_start.prompt_kind == .initial);
+}
+
+test "OSC 133: prompt_start with k=r" {
+    const testing = std.testing;
+
+    var p: Parser = .init(null);
+
+    const input = "133;P;k=r";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end(null).?.*;
+    try testing.expect(cmd == .semantic_prompt);
+    try testing.expect(cmd.semantic_prompt == .prompt_start);
+    try testing.expect(cmd.semantic_prompt.prompt_start.prompt_kind == .right);
+}
+
+test "OSC 133: prompt_start with k=c" {
+    const testing = std.testing;
+
+    var p: Parser = .init(null);
+
+    const input = "133;P;k=c";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end(null).?.*;
+    try testing.expect(cmd == .semantic_prompt);
+    try testing.expect(cmd.semantic_prompt == .prompt_start);
+    try testing.expect(cmd.semantic_prompt.prompt_start.prompt_kind == .continuation);
+}
+
+test "OSC 133: prompt_start with k=s" {
+    const testing = std.testing;
+
+    var p: Parser = .init(null);
+
+    const input = "133;P;k=s";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end(null).?.*;
+    try testing.expect(cmd == .semantic_prompt);
+    try testing.expect(cmd.semantic_prompt == .prompt_start);
+    try testing.expect(cmd.semantic_prompt.prompt_start.prompt_kind == .secondary);
+}
+
+test "OSC 133: prompt_start with invalid k" {
+    const testing = std.testing;
+
+    var p: Parser = .init(null);
+
+    const input = "133;P;k=x";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end(null).?.*;
+    try testing.expect(cmd == .semantic_prompt);
+    try testing.expect(cmd.semantic_prompt == .prompt_start);
+    try testing.expect(cmd.semantic_prompt.prompt_start.prompt_kind == null);
+}
+
+test "OSC 133: prompt_start extra contents" {
+    const testing = std.testing;
+
+    var p: Parser = .init(null);
+    const input = "133;Pextra";
+    for (input) |ch| p.next(ch);
+    try testing.expect(p.end(null) == null);
+}