feat: parse ConEmu OSC9;1 (#4327)

# Description

This PR implements support for the [ConEmu OSC9;1 escape
sequence](https://conemu.github.io/en/AnsiEscapeCodes.html#OSC_Operating_system_commands).

Based on my understanding of [ConEmu's source
code](740b09c363/src/ConEmuCD/ConAnsiImpl.cpp (L705-L724)):
- The default timeout is set to `100` milliseconds if no value is
specified.
- The timeout value is clamped to a maximum of `10000` milliseconds.

#3125

src/inspector/termio.zig

@@ -279,7 +279,7 @@ pub const VTEvent = struct {
             ),
 
             else => switch (Value) {
-                u8 => try md.put(
+                u8, u16 => try md.put(
                     key,
                     try std.fmt.allocPrintZ(alloc, "{}", .{value}),
                 ),

src/terminal/osc.zig

@@ -67,7 +67,7 @@ pub const Command = union(enum) {
 
     /// End of current command.
     ///
-    /// The exit-code need not be specified if  if there are no options,
+    /// The exit-code need not be specified if there are no options,
     /// or if the command was cancelled (no OSC "133;C"), such as by typing
     /// an interrupt/cancel character (typically ctrl-C) during line-editing.
     /// Otherwise, it must be an integer code, where 0 means the command
@@ -158,6 +158,11 @@ pub const Command = union(enum) {
     /// End a hyperlink (OSC 8)
     hyperlink_end: void,
 
+    /// Sleep (OSC 9;1)
+    sleep: struct {
+        duration_ms: u16,
+    },
+
     /// Show GUI message Box (OSC 9;2)
     show_message_box: []const u8,
 
@@ -362,6 +367,8 @@ pub const Parser = struct {
         osc_9,
 
         // ConEmu specific substates
+        conemu_sleep,
+        conemu_sleep_value,
         conemu_message_box,
         conemu_tab,
         conemu_tab_txt,
@@ -789,6 +796,9 @@ pub const Parser = struct {
             },
 
             .osc_9 => switch (c) {
+                '1' => {
+                    self.state = .conemu_sleep;
+                },
                 '2' => {
                     self.state = .conemu_message_box;
                 },
@@ -806,6 +816,16 @@ pub const Parser = struct {
                 else => self.showDesktopNotification(),
             },
 
+            .conemu_sleep => switch (c) {
+                ';' => {
+                    self.command = .{ .sleep = .{ .duration_ms = 100 } };
+                    self.buf_start = self.buf_idx;
+                    self.complete = true;
+                    self.state = .conemu_sleep_value;
+                    },
+                else => self.state = .invalid,
+            },
+
             .conemu_message_box => switch (c) {
                 ';' => {
                     self.command = .{ .show_message_box = undefined };
@@ -817,6 +837,10 @@ pub const Parser = struct {
                 else => self.state = .invalid,
             },
 
+            .conemu_sleep_value => switch (c) {
+                else => self.complete = true,
+            },
+
             .conemu_tab => switch (c) {
                 ';' => {
                     self.state = .conemu_tab_txt;
@@ -1193,6 +1217,22 @@ pub const Parser = struct {
         self.temp_state.str.* = self.buf[self.buf_start..self.buf_idx];
     }
 
+    fn endConEmuSleepValue(self: *Parser) void {
+        switch (self.command) {
+            .sleep => |*v| v.duration_ms = value: {
+                const str = self.buf[self.buf_start..self.buf_idx];
+                if (str.len == 0) break :value 100;
+
+                if (std.fmt.parseUnsigned(u16, str, 10)) |num| {
+                    break :value @min(num, 10_000);
+                } else |_| {
+                    break :value 100;
+                }
+            },
+            else => {},
+        }
+    }
+
     fn endKittyColorProtocolOption(self: *Parser, kind: enum { key_only, key_and_value }, final: bool) void {
         if (self.temp_state.key.len == 0) {
             log.warn("zero length key in kitty color protocol", .{});
@@ -1271,6 +1311,7 @@ pub const Parser = struct {
             .semantic_option_value => self.endSemanticOptionValue(),
             .hyperlink_uri => self.endHyperlink(),
             .string => self.endString(),
+            .conemu_sleep_value => self.endConEmuSleepValue(),
             .allocable_string => self.endAllocableString(),
             .kitty_color_protocol_key => self.endKittyColorProtocolOption(.key_only, true),
             .kitty_color_protocol_value => self.endKittyColorProtocolOption(.key_and_value, true),
@@ -1680,6 +1721,62 @@ test "OSC: set palette color" {
     try testing.expectEqualStrings(cmd.set_color.value, "rgb:aa/bb/cc");
 }
 
+test "OSC: conemu sleep" {
+    const testing = std.testing;
+
+    var p: Parser = .{};
+
+    const input = "9;1;420";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end('\x1b').?;
+
+    try testing.expect(cmd == .sleep);
+    try testing.expectEqual(420, cmd.sleep.duration_ms);
+}
+
+test "OSC: conemu sleep with no value default to 100ms" {
+    const testing = std.testing;
+
+    var p: Parser = .{};
+
+    const input = "9;1;";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end('\x1b').?;
+
+    try testing.expect(cmd == .sleep);
+    try testing.expectEqual(100, cmd.sleep.duration_ms);
+}
+
+test "OSC: conemu sleep cannot exceed 10000ms" {
+    const testing = std.testing;
+
+    var p: Parser = .{};
+
+    const input = "9;1;12345";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end('\x1b').?;
+
+    try testing.expect(cmd == .sleep);
+    try testing.expectEqual(10000, cmd.sleep.duration_ms);
+}
+
+test "OSC: conemu sleep invalid input" {
+    const testing = std.testing;
+
+    var p: Parser = .{};
+
+    const input = "9;1;foo";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end('\x1b').?;
+
+    try testing.expect(cmd == .sleep);
+    try testing.expectEqual(100, cmd.sleep.duration_ms);
+}
+
 test "OSC: show desktop notification" {
     const testing = std.testing;
 

src/terminal/stream.zig

@@ -1605,7 +1605,7 @@ pub fn Stream(comptime Handler: type) type {
                     } else log.warn("unimplemented OSC callback: {}", .{cmd});
                 },
 
-                .progress, .show_message_box, .change_conemu_tab_title => {
+                .progress, .sleep, .show_message_box, .change_conemu_tab_title => {
                     log.warn("unimplemented OSC callback: {}", .{cmd});
                 },
             }