fix: Xterm Send Device Attributes (Primary DA) (#607)

src/main/kotlin/app/termora/terminal/ControlSequenceIntroducerProcessor.kt

@@ -360,8 +360,9 @@ class ControlSequenceIntroducerProcessor(terminal: Terminal, reader: TerminalRea
                 }
             }
 
-            // TODO Send Device Attributes (Primary DA).
+            // Send Device Attributes (Primary DA).
             'c' -> {
+                sendDeviceAttributes()
             }
 
             // CSI Ps M  Delete Ps Line(s) (default = 1) (DL).
@@ -505,6 +506,22 @@ class ControlSequenceIntroducerProcessor(terminal: Terminal, reader: TerminalRea
 
     }
 
+    private fun sendDeviceAttributes() {
+
+        assertEventDispatchThread()
+
+        if (!terminalModel.hasData(DataKey.TerminalWriter)) {
+            return
+        }
+
+        val writer = terminalModel.getData(DataKey.TerminalWriter)
+
+        // VT102_RESPONSE
+        val bytes = "${ControlCharacters.ESC}[?6c".toByteArray(writer.getCharset())
+        writer.write(TerminalWriter.WriteRequest.fromBytes(bytes))
+
+    }
+
     /**
      * https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-Functions-using-CSI-_-ordered-by-the-final-character-lparen-s-rparen:CSI-?-Pm-h.1D0E
      */

src/test/resources/issue-564/Dockerfile

@@ -0,0 +1,29 @@
+FROM debian:bookworm-slim
+ENV DEBIAN_FRONTEND=noninteractive
+ENV TZ=Asia/Shanghai
+# 安装基础包 + sshd + nvim 依赖
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    openssh-server curl ca-certificates tzdata git unzip \
+    libfuse2 locales && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
+# 安装 nvim 最新版（AppImage 提取）
+RUN curl -LO https://github.com/neovim/neovim/releases/download/v0.11.1/nvim-linux-arm64.appimage && \
+    mv nvim-linux-arm64.appimage nvim.appimage && chmod u+x nvim.appimage && ./nvim.appimage --appimage-extract && \
+    mv squashfs-root/usr/bin/nvim /usr/local/bin/nvim && \
+    rm -rf squashfs-root nvim.appimage
+# 配置 SSH
+RUN mkdir /var/run/sshd && \
+    echo 'root:root' | chpasswd && \
+    echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config && \
+    echo 'PasswordAuthentication yes' >> /etc/ssh/sshd_config
+# 设置语言环境（可选）
+RUN echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && \
+    apt-get update && apt-get install -y locales && \
+    locale-gen en_US.UTF-8 && \
+    update-locale LANG=en_US.UTF-8
+ENV LANG=en_US.UTF-8 \
+    LANGUAGE=en_US:en \
+    LC_ALL=en_US.UTF-8
+# 启动 SSHD
+EXPOSE 22
+CMD ["/usr/sbin/sshd", "-D"]