Improve TUI pager and search ergonomics

docs/CHANGELOG.md

@@ -28,6 +28,8 @@
 - Added a VHS tape draft for recording the core TNT terminal-chat experience.
 - Added live `:inbox` refresh behavior: `r` refreshes the inbox manually, and
   an open inbox refreshes when a new private message arrives.
+- Added `/` in NORMAL mode as a fast history-search entrypoint backed by the
+  existing `:search` command.
 - Added `make slow-client-test`, an opt-in regression for an unread
   interactive SSH client under backpressure while health, stats, post, tail,
   and server survival stay responsive.
@@ -73,6 +75,12 @@
   contract.
 - The two-user lifecycle test now covers opening `:inbox` before a private
   message arrives, matching the way users often leave an inbox page open.
+- Help and command-output pagers now accept arrow keys, PgUp/PgDn, Home/End,
+  and Space/`b` in addition to the existing Vim-style keys.
+- Pre-login username entry now handles Ctrl+C/Ctrl+D cancel, Ctrl+U clear
+  line, and Ctrl+W delete-word before the user joins the room.
+- Long COMMAND-mode input is now left-truncated with a visible marker in the
+  status line instead of wrapping and damaging the TUI.
 - Private-message inbox access now uses its own mutex instead of sharing the
   SSH channel write lock, reducing unrelated contention on slow clients.
 - Client writes now check the SSH channel's remote window before writing and

docs/EASY_SETUP.md

@@ -64,7 +64,10 @@ Esc         enter NORMAL mode
 i           return to INSERT mode
 :           enter COMMAND mode
 ?           open the full key reference
+/           search message history
 G or End    jump to latest messages
+Up/Down     recall sent messages in INSERT mode
+Tab         complete @mention in INSERT mode
 Ctrl+C      disconnect from NORMAL mode
 ```
 
@@ -209,7 +212,10 @@ Esc          进入 NORMAL 模式
 i            回到 INSERT 模式
 :            输入命令
 ?            查看完整按键参考
+/            搜索消息历史
 G 或 End      回到最新消息
+Up/Down      在 INSERT 模式调出已发送消息
+Tab          在 INSERT 模式补全 @mention
 :help        查看简明手册
 :lang en|zh  切换界面语言
 :q           断开连接

docs/USER_LIFECYCLE.md

@@ -11,8 +11,9 @@ The product path should stay short:
 4. User lands in INSERT mode at the live tail and can type immediately.
 5. User presses Esc to browse history with Vim-style movement.
 6. User uses `:help` for the concise manual or `?` for the full key reference.
-7. User uses commands only when needed: `:users`, `:msg`, `:inbox`, `:last`,
+7. User searches from NORMAL with `/term`, or uses commands when needed:
-   `:search`, `:nick`, `:mute-joins`, and `:q`.
+   `:users`, `:msg`, `:inbox`, `:last`, `:search`, `:nick`, `:mute-joins`,
+   and `:q`.
 8. Scripts and operators use `tntctl` or SSH exec commands for `health`,
    `stats`, `users`, `tail`, `dump`, and `post`.
 
@@ -23,6 +24,10 @@ The product path should stay short:
 - INSERT mode is the default because most users arrive to send a message.
 - NORMAL mode opens at the latest messages, not the oldest history. Users can
   move upward for older context and use `G` or End to return to live chat.
+- NORMAL mode accepts `/` as the fast path for history search, matching a
+  common terminal-reader habit while reusing the existing `:search` command.
+- INSERT mode keeps a small per-session sent-message history on Up/Down and
+  completes trailing `@mention` prefixes with Tab.
 - `:help` is a compact manual, while `?` is a full key reference. Do not add
   parallel support commands for the same task.
 - Command syntax stays ASCII even in localized UI text. Translations explain;

src/help_text.c

@@ -19,6 +19,8 @@ void help_text_append_full(char *buffer, size_t buf_size, size_t *pos,
         "  Backspace  - Delete character\n"
         "  Ctrl+W     - Delete last word\n"
         "  Ctrl+U     - Delete line\n"
+        "  Up/Down    - Recall sent messages\n"
+        "  Tab        - Complete @mention\n"
         "  Ctrl+C     - Enter NORMAL mode\n"
         "\n"
         "NORMAL MODE KEYS:\n"
@@ -26,6 +28,7 @@ void help_text_append_full(char *buffer, size_t buf_size, size_t *pos,
         "  Follows latest until you scroll up\n"
         "  i          - Return to INSERT mode\n"
         "  :          - Enter COMMAND mode\n"
+        "  /          - Search message history\n"
         "  j/k        - Scroll down/up one line\n"
         "  Ctrl+D/U   - Scroll half page down/up\n"
         "  Ctrl+F/B   - Scroll full page down/up\n"
@@ -49,6 +52,8 @@ void help_text_append_full(char *buffer, size_t buf_size, size_t *pos,
         "  Backspace  - 删除字符\n"
         "  Ctrl+W     - 删除上个单词\n"
         "  Ctrl+U     - 删除整行\n"
+        "  Up/Down    - 调出已发送消息\n"
+        "  Tab        - 补全 @mention\n"
         "  Ctrl+C     - 进入 NORMAL 模式\n"
         "\n"
         "NORMAL 模式按键:\n"
@@ -56,6 +61,7 @@ void help_text_append_full(char *buffer, size_t buf_size, size_t *pos,
         "  未向上翻阅时自动跟随最新消息\n"
         "  i          - 返回 INSERT 模式\n"
         "  :          - 进入 COMMAND 模式\n"
+        "  /          - 搜索消息历史\n"
         "  j/k        - 向下/上滚动一行\n"
         "  Ctrl+D/U   - 向下/上滚动半页\n"
         "  Ctrl+F/B   - 向下/上滚动整页\n"
@@ -71,9 +77,12 @@ void help_text_append_full(char *buffer, size_t buf_size, size_t *pos,
         "\n"
         "COMMAND OUTPUT KEYS:\n"
         "  q, ESC     - Close output\n"
-        "  j/k        - Scroll down/up\n"
+        "  j/k, arrows - Scroll down/up\n"
         "  Ctrl+D/U   - Scroll half page down/up\n"
         "  Ctrl+F/B   - Scroll full page down/up\n"
+        "  Space/b    - Scroll full page down/up\n"
+        "  PgDn/PgUp  - Scroll full page down/up\n"
+        "  End/Home   - Jump to bottom/top\n"
         "  g/G        - Jump to top/bottom\n"
         "  r          - Refresh live output (:inbox)\n"
         "\n"
@@ -83,17 +92,23 @@ void help_text_append_full(char *buffer, size_t buf_size, size_t *pos,
         "\n"
         "HELP SCREEN KEYS:\n"
         "  q, ESC     - Close help\n"
-        "  j/k        - Scroll down/up\n"
+        "  j/k, arrows - Scroll down/up\n"
         "  Ctrl+D/U   - Scroll half page down/up\n"
         "  Ctrl+F/B   - Scroll full page down/up\n"
+        "  Space/b    - Scroll full page down/up\n"
+        "  PgDn/PgUp  - Scroll full page down/up\n"
+        "  End/Home   - Jump to bottom/top\n"
         "  g/G        - Jump to top/bottom\n"
         "  l          - Cycle UI language\n",
         "\n"
         "命令输出按键:\n"
         "  q, ESC     - 关闭输出\n"
-        "  j/k        - 向下/上滚动\n"
+        "  j/k, arrows - 向下/上滚动\n"
         "  Ctrl+D/U   - 向下/上滚动半页\n"
         "  Ctrl+F/B   - 向下/上滚动整页\n"
+        "  Space/b    - 向下/上滚动整页\n"
+        "  PgDn/PgUp  - 向下/上滚动整页\n"
+        "  End/Home   - 跳到底部/顶部\n"
         "  g/G        - 跳到顶部/底部\n"
         "  r          - 刷新动态输出 (:inbox)\n"
         "\n"
@@ -103,9 +118,12 @@ void help_text_append_full(char *buffer, size_t buf_size, size_t *pos,
         "\n"
         "帮助界面按键:\n"
         "  q, ESC     - 关闭帮助\n"
-        "  j/k        - 向下/上滚动\n"
+        "  j/k, arrows - 向下/上滚动\n"
         "  Ctrl+D/U   - 向下/上滚动半页\n"
         "  Ctrl+F/B   - 向下/上滚动整页\n"
+        "  Space/b    - 向下/上滚动整页\n"
+        "  PgDn/PgUp  - 向下/上滚动整页\n"
+        "  End/Home   - 跳到底部/顶部\n"
         "  g/G        - 跳到顶部/底部\n"
         "  l          - 切换界面语言\n"
     );

src/input.c

@@ -32,10 +32,10 @@ static int read_username(client_t *client) {
     char username[MAX_USERNAME_LEN] = {0};
     int pos = 0;
     char buf[4];
+    const char *prompt = i18n_text(client->ui_lang, I18N_USERNAME_PROMPT);
 
     tui_render_welcome(client);
-    client_printf(client, "%s", i18n_text(client->ui_lang,
+    client_printf(client, "%s", prompt);
-                                          I18N_USERNAME_PROMPT));
 
     while (1) {
         int n = ssh_channel_read_timeout(client->channel, buf, 1, 0, 60000); /* 60 sec timeout */
@@ -54,6 +54,18 @@ static int read_username(client_t *client) {
 
         if (b == '\r' || b == '\n') {
             break;
+        } else if (b == 3 || b == 4) {  /* Ctrl+C / Ctrl+D */
+            return -1;
+        } else if (b == 21) {  /* Ctrl+U: clear line */
+            username[0] = '\0';
+            pos = 0;
+            client_printf(client, "\r\033[K%s", prompt);
+        } else if (b == 23) {  /* Ctrl+W: delete word */
+            if (username[0] != '\0') {
+                utf8_remove_last_word(username);
+                pos = (int)strlen(username);
+                client_printf(client, "\r\033[K%s%s", prompt, username);
+            }
         } else if (b == 127 || b == 8) {  /* Backspace */
             if (pos > 0) {
                 /* Compute width of the last character before removing it */
@@ -230,6 +242,110 @@ static void dismiss_command_output(client_t *client) {
     tui_render_screen(client);
 }
 
+typedef enum {
+    PAGER_ACTION_NONE,
+    PAGER_ACTION_SCROLL,
+    PAGER_ACTION_CLOSE,
+    PAGER_ACTION_REFRESH
+} pager_action_t;
+
+static int pager_page_height(client_t *client) {
+    int page = client->height - 2;
+    if (page < 1) page = 1;
+    return page;
+}
+
+static void pager_scroll_by(int *scroll_pos, int delta) {
+    *scroll_pos += delta;
+    if (*scroll_pos < 0) {
+        *scroll_pos = 0;
+    }
+}
+
+static pager_action_t pager_apply_key(client_t *client, unsigned char key,
+                                      int *scroll_pos, bool allow_refresh) {
+    int page = pager_page_height(client);
+    int half = page / 2;
+    if (half < 1) half = 1;
+
+    if (key == 'q') {
+        return PAGER_ACTION_CLOSE;
+    } else if (key == 'j') {
+        pager_scroll_by(scroll_pos, 1);
+        return PAGER_ACTION_SCROLL;
+    } else if (key == 'k') {
+        pager_scroll_by(scroll_pos, -1);
+        return PAGER_ACTION_SCROLL;
+    } else if (key == 4) {  /* Ctrl+D: half page down */
+        pager_scroll_by(scroll_pos, half);
+        return PAGER_ACTION_SCROLL;
+    } else if (key == 21) {  /* Ctrl+U: half page up */
+        pager_scroll_by(scroll_pos, -half);
+        return PAGER_ACTION_SCROLL;
+    } else if (key == 6 || key == ' ') {  /* Ctrl+F / Space: page down */
+        pager_scroll_by(scroll_pos, page);
+        return PAGER_ACTION_SCROLL;
+    } else if (key == 2 || key == 'b') {  /* Ctrl+B / b: page up */
+        pager_scroll_by(scroll_pos, -page);
+        return PAGER_ACTION_SCROLL;
+    } else if (key == 'g') {
+        *scroll_pos = 0;
+        return PAGER_ACTION_SCROLL;
+    } else if (key == 'G') {
+        *scroll_pos = 999;
+        return PAGER_ACTION_SCROLL;
+    } else if ((key == 'r' || key == 'R') && allow_refresh) {
+        return PAGER_ACTION_REFRESH;
+    } else if (key == 27) {
+        char seq[3];
+        int n = ssh_channel_read_timeout(client->channel, seq, 1, 0, 50);
+        if (n != 1) {
+            return PAGER_ACTION_CLOSE;
+        }
+        if (seq[0] != '[') {
+            return PAGER_ACTION_NONE;
+        }
+
+        n = ssh_channel_read_timeout(client->channel, &seq[1], 1, 0, 50);
+        if (n != 1) {
+            return PAGER_ACTION_NONE;
+        }
+
+        if (seq[1] == 'A') {          /* Up arrow */
+            pager_scroll_by(scroll_pos, -1);
+            return PAGER_ACTION_SCROLL;
+        } else if (seq[1] == 'B') {   /* Down arrow */
+            pager_scroll_by(scroll_pos, 1);
+            return PAGER_ACTION_SCROLL;
+        } else if (seq[1] == 'H') {   /* Home */
+            *scroll_pos = 0;
+            return PAGER_ACTION_SCROLL;
+        } else if (seq[1] == 'F') {   /* End */
+            *scroll_pos = 999;
+            return PAGER_ACTION_SCROLL;
+        } else if (seq[1] >= '1' && seq[1] <= '6') {
+            n = ssh_channel_read_timeout(client->channel, &seq[2], 1, 0, 50);
+            if (n == 1 && seq[2] == '~') {
+                if (seq[1] == '5') {        /* PageUp */
+                    pager_scroll_by(scroll_pos, -page);
+                    return PAGER_ACTION_SCROLL;
+                } else if (seq[1] == '6') { /* PageDown */
+                    pager_scroll_by(scroll_pos, page);
+                    return PAGER_ACTION_SCROLL;
+                } else if (seq[1] == '1') { /* Home */
+                    *scroll_pos = 0;
+                    return PAGER_ACTION_SCROLL;
+                } else if (seq[1] == '4') { /* End */
+                    *scroll_pos = 999;
+                    return PAGER_ACTION_SCROLL;
+                }
+            }
+        }
+    }
+
+    return PAGER_ACTION_NONE;
+}
+
 /* Handle a single key press.  Returns true if the key was fully consumed
  * (no further character buffering needed). */
 static bool handle_key(client_t *client, unsigned char key, char *input) {
@@ -257,44 +373,20 @@ static bool handle_key(client_t *client, unsigned char key, char *input) {
 
     /* Handle help screen */
     if (client->show_help) {
-        /* Page size: roughly the visible help body region. */
+        pager_action_t action;
-        int page = client->height - 2;
-        if (page < 1) page = 1;
-        int half = page / 2;
-        if (half < 1) half = 1;
 
-        if (key == 'q' || key == 27) {
+        if (key == 'l' || key == 'L') {
-            client->show_help = false;
-            tui_render_screen(client);
-        } else if (key == 'l' || key == 'L') {
             client->ui_lang = i18n_next_ui_lang(client->ui_lang);
             client->help_scroll_pos = 0;
             tui_render_help(client);
-        } else if (key == 'j') {
+            return true;
-            client->help_scroll_pos++;
+        }
-            tui_render_help(client);
+
-        } else if (key == 'k' && client->help_scroll_pos > 0) {
+        action = pager_apply_key(client, key, &client->help_scroll_pos, false);
-            client->help_scroll_pos--;
+        if (action == PAGER_ACTION_CLOSE) {
-            tui_render_help(client);
+            client->show_help = false;
-        } else if (key == 4) {  /* Ctrl+D: half page down */
+            tui_render_screen(client);
-            client->help_scroll_pos += half;
+        } else if (action == PAGER_ACTION_SCROLL) {
-            tui_render_help(client);
-        } else if (key == 21) {  /* Ctrl+U: half page up */
-            client->help_scroll_pos -= half;
-            if (client->help_scroll_pos < 0) client->help_scroll_pos = 0;
-            tui_render_help(client);
-        } else if (key == 6) {  /* Ctrl+F: full page down */
-            client->help_scroll_pos += page;
-            tui_render_help(client);
-        } else if (key == 2) {  /* Ctrl+B: full page up */
-            client->help_scroll_pos -= page;
-            if (client->help_scroll_pos < 0) client->help_scroll_pos = 0;
-            tui_render_help(client);
-        } else if (key == 'g') {
-            client->help_scroll_pos = 0;
-            tui_render_help(client);
-        } else if (key == 'G') {
-            client->help_scroll_pos = 999;  /* Large number */
             tui_render_help(client);
         }
         return true;  /* Key consumed */
@@ -303,56 +395,23 @@ static bool handle_key(client_t *client, unsigned char key, char *input) {
     /* Handle command output / MOTD display.  MOTD remains a simple notice;
      * command output behaves like a small pager so long results can be read. */
     if (client->command_output[0] != '\0') {
-        int page = client->height - 2;
+        pager_action_t action;
-        int half;
 
         if (client->show_motd) {
             dismiss_command_output(client);
             return true;
         }
 
-        if (page < 1) page = 1;
+        action = pager_apply_key(client, key, &client->command_output_scroll,
-        half = page / 2;
+                                 true);
-        if (half < 1) half = 1;
+        if (action == PAGER_ACTION_CLOSE) {
-
-        if (key == 'q' || key == 27) {
             dismiss_command_output(client);
-        } else if (key == 'j') {
+        } else if (action == PAGER_ACTION_SCROLL) {
-            client->command_output_scroll++;
             tui_render_command_output(client);
-        } else if (key == 'k') {
+        } else if (action == PAGER_ACTION_REFRESH) {
-            client->command_output_scroll--;
+            if (commands_refresh_active_output(client)) {
-            if (client->command_output_scroll < 0) {
+                tui_render_command_output(client);
-                client->command_output_scroll = 0;
             }
-            tui_render_command_output(client);
-        } else if (key == 4) {  /* Ctrl+D: half page down */
-            client->command_output_scroll += half;
-            tui_render_command_output(client);
-        } else if (key == 21) {  /* Ctrl+U: half page up */
-            client->command_output_scroll -= half;
-            if (client->command_output_scroll < 0) {
-                client->command_output_scroll = 0;
-            }
-            tui_render_command_output(client);
-        } else if (key == 6) {  /* Ctrl+F: full page down */
-            client->command_output_scroll += page;
-            tui_render_command_output(client);
-        } else if (key == 2) {  /* Ctrl+B: full page up */
-            client->command_output_scroll -= page;
-            if (client->command_output_scroll < 0) {
-                client->command_output_scroll = 0;
-            }
-            tui_render_command_output(client);
-        } else if (key == 'g') {
-            client->command_output_scroll = 0;
-            tui_render_command_output(client);
-        } else if (key == 'G') {
-            client->command_output_scroll = 999;
-            tui_render_command_output(client);
-        } else if ((key == 'r' || key == 'R') &&
-                   commands_refresh_active_output(client)) {
-            tui_render_command_output(client);
         }
         return true;  /* Key consumed */
     }
@@ -571,6 +630,12 @@ static bool handle_key(client_t *client, unsigned char key, char *input) {
                 client->command_input[0] = '\0';
                 tui_render_screen(client);
                 return true;
+            } else if (key == '/') {
+                client->mode = MODE_COMMAND;
+                snprintf(client->command_input, sizeof(client->command_input),
+                         "search ");
+                tui_render_screen(client);
+                return true;
             } else if (key == 'j') {
                 normal_scroll_by(client, 1);
                 tui_render_screen(client);
@@ -953,6 +1018,8 @@ main_loop:
                         client->command_input[len] = b;
                         client->command_input[len + 1] = '\0';
                         tui_render_screen(client);
+                    } else {
+                        client_send(client, "\a", 1);
                     }
                 } else if (b >= 128) {  /* UTF-8 multi-byte */
                     int char_len = utf8_byte_length(b);
@@ -965,10 +1032,12 @@ main_loop:
                     }
                     if (!utf8_is_valid_sequence(buf, char_len)) continue;
                     size_t len = strlen(client->command_input);
-                    if (len + (size_t)char_len < sizeof(client->command_input) - 1) {
+                    if (len + (size_t)char_len <= sizeof(client->command_input) - 1) {
                         memcpy(client->command_input + len, buf, char_len);
                         client->command_input[len + char_len] = '\0';
                         tui_render_screen(client);
+                    } else {
+                        client_send(client, "\a", 1);
                     }
                 }
             }

src/manual_text.c

@@ -12,8 +12,8 @@ void manual_text_append_interactive(char *buffer, size_t buf_size,
         "  TNT - SSH terminal chat room\n"
         "\n"
         "\033[1;37mUse\033[0m\n"
-        "  Type a message and press Enter; Esc browses; G latest; i types\n"
+        "  Type, Enter sends; Up/Down recalls; Tab completes @mentions\n"
-        "  : runs commands; ? opens the full key reference\n"
+        "  Esc browses; / searches; G latest; i types; : commands; ? keys\n"
         "\n"
         "\033[1;37mCommands\033[0m\n",
         "\033[1;36mTNT(1) 帮助\033[0m\n"
@@ -22,8 +22,8 @@ void manual_text_append_interactive(char *buffer, size_t buf_size,
         "  TNT - SSH 终端聊天室\n"
         "\n"
         "\033[1;37m使用\033[0m\n"
-        "  输入消息并 Enter 发送；Esc 浏览历史；G 最新；i 输入\n"
+        "  输入并 Enter 发送；Up/Down 调出消息；Tab 补全 @mention\n"
-        "  : 运行命令；? 打开完整按键参考\n"
+        "  Esc 浏览；/ 搜索；G 最新；i 输入；: 命令；? 按键\n"
         "\n"
         "\033[1;37m命令\033[0m\n"
     );

src/tui_status.c

@@ -1,6 +1,54 @@
 #include "tui_status.h"
 #include "i18n.h"
 #include "ssh_server.h"
+#include "utf8.h"
+
+static void format_command_input_tail(const char *input, int avail_width,
+                                      char *display, size_t display_size) {
+    if (!input || !display || display_size == 0) return;
+
+    display[0] = '\0';
+    if (avail_width < 1) {
+        return;
+    }
+
+    if (utf8_string_width(input) <= avail_width) {
+        strncpy(display, input, display_size - 1);
+        display[display_size - 1] = '\0';
+        return;
+    }
+
+    const char *marker = "<";
+    int marker_width = 1;
+    int tail_width = avail_width - marker_width;
+    if (tail_width < 1) {
+        snprintf(display, display_size, "%s", marker);
+        return;
+    }
+
+    const char *p = input + strlen(input);
+    const char *tail = p;
+    int width = 0;
+
+    while (p > input && width < tail_width) {
+        const char *q = p - 1;
+        while (q > input && ((*q & 0xC0) == 0x80)) {
+            q--;
+        }
+
+        int bytes_read = 0;
+        uint32_t cp = utf8_decode(q, &bytes_read);
+        int char_width = utf8_char_width(cp);
+        if (width + char_width > tail_width) {
+            break;
+        }
+        width += char_width;
+        tail = q;
+        p = q;
+    }
+
+    snprintf(display, display_size, "%s%s", marker, tail);
+}
 
 void tui_status_append(char *buffer, size_t buf_size, size_t *pos,
                        const struct client *client, int msg_count,
@@ -48,7 +96,12 @@ void tui_status_append(char *buffer, size_t buf_size, size_t *pos,
                            i18n_text(client->ui_lang, I18N_NORMAL_LATEST));
         }
     } else if (client->mode == MODE_COMMAND) {
+        char display[sizeof(client->command_input) + 2];
+        int avail = client->width - 1;
+        if (avail < 1) avail = 1;
+        format_command_input_tail(client->command_input, avail, display,
+                                  sizeof(display));
         buffer_appendf(buffer, buf_size, pos,
-                       "\033[35m:\033[0m%s\033[K", client->command_input);
+                       "\033[35m:\033[0m%s\033[K", display);
     }
 }

tests/test_interactive_input.sh

@@ -58,6 +58,51 @@ else
     exit 1
 fi
 
+USERNAME_CANCEL_SCRIPT="$STATE_DIR/username-cancel.expect"
+cat >"$USERNAME_CANCEL_SCRIPT" <<EOF
+set timeout 10
+spawn ssh $SSH_OPTS anonymous@127.0.0.1
+sleep 1
+send -- "\003"
+expect eof
+EOF
+
+if expect "$USERNAME_CANCEL_SCRIPT" >"$STATE_DIR/username-cancel.log" 2>&1; then
+    echo "✓ Ctrl+C cancels before username join"
+    PASS=$((PASS + 1))
+else
+    echo "x Ctrl+C before username failed"
+    sed -n '1,120p' "$STATE_DIR/username-cancel.log"
+    sed -n '1,120p' "$STATE_DIR/server.log"
+    FAIL=$((FAIL + 1))
+fi
+
+USERNAME_EDIT_SCRIPT="$STATE_DIR/username-edit.expect"
+cat >"$USERNAME_EDIT_SCRIPT" <<EOF
+set timeout 10
+spawn ssh $SSH_OPTS anonymous@127.0.0.1
+sleep 1
+send -- "wrong\025editeduser\r"
+expect ":help"
+send -- "\003"
+sleep 0.2
+send -- "\003"
+expect eof
+EOF
+
+if expect "$USERNAME_EDIT_SCRIPT" >"$STATE_DIR/username-edit.log" 2>&1 &&
+   grep -q 'editeduser' "$STATE_DIR/messages.log" &&
+   ! grep -q 'wrongediteduser' "$STATE_DIR/messages.log"; then
+    echo "✓ Ctrl+U edits username before join"
+    PASS=$((PASS + 1))
+else
+    echo "x username line editing failed"
+    sed -n '1,120p' "$STATE_DIR/username-edit.log" 2>/dev/null || true
+    cat "$STATE_DIR/messages.log" 2>/dev/null || true
+    sed -n '1,120p' "$STATE_DIR/server.log"
+    FAIL=$((FAIL + 1))
+fi
+
 EXPECT_SCRIPT="$STATE_DIR/bracketed-paste.expect"
 cat >"$EXPECT_SCRIPT" <<EOF
 set timeout 10
@@ -146,14 +191,17 @@ send -- ":"
 expect ":"
 send -- "help\r"
 expect "TNT\\(1\\) 帮助"
+expect "Tab 补全 @mention"
 expect "q:关闭"
 send -- "q"
 expect "NORMAL"
 send -- "?"
 expect "TNT 按键参考"
+expect "Tab        - 补全 @mention"
 expect "l:语言"
 send -- "l"
 expect "TNT KEY REFERENCE"
+expect "Complete @mention"
 expect "l:lang"
 send -- "q"
 expect "NORMAL"
@@ -180,6 +228,45 @@ else
     FAIL=$((FAIL + 1))
 fi
 
+HELP_PAGER_KEYS_SCRIPT="$STATE_DIR/help-pager-keys.expect"
+cat >"$HELP_PAGER_KEYS_SCRIPT" <<EOF
+set timeout 10
+stty rows 8 columns 80
+spawn ssh $SSH_OPTS anonymous@127.0.0.1
+sleep 1
+send -- "helppager\r"
+expect ":help"
+send -- "\033"
+expect "NORMAL"
+send -- "?"
+expect -re {\(1/[2-9][0-9]*\)}
+send -- "\033\[6~"
+expect -re {\([2-9][0-9]*/[2-9][0-9]*\)}
+send -- "\033\[5~"
+expect -re {\(1/[2-9][0-9]*\)}
+send -- "\033\[F"
+expect -re {\([2-9][0-9]*/[2-9][0-9]*\)}
+send -- "\033\[H"
+expect -re {\(1/[2-9][0-9]*\)}
+send -- "q"
+expect "NORMAL"
+sleep 0.2
+send -- "\003"
+sleep 0.2
+send -- "\003"
+expect eof
+EOF
+
+if expect "$HELP_PAGER_KEYS_SCRIPT" >"$STATE_DIR/help-pager-keys.log" 2>&1; then
+    echo "✓ help pager accepts terminal paging keys"
+    PASS=$((PASS + 1))
+else
+    echo "x help pager terminal keys failed"
+    sed -n '1,220p' "$STATE_DIR/help-pager-keys.log"
+    sed -n '1,120p' "$STATE_DIR/server.log"
+    FAIL=$((FAIL + 1))
+fi
+
 UNKNOWN_SCRIPT="$STATE_DIR/unknown-command.expect"
 cat >"$UNKNOWN_SCRIPT" <<EOF
 set timeout 10
@@ -371,6 +458,14 @@ expect "j/k:滚动"
 expect -re {\(1/[2-9][0-9]*\)}
 send -- "j"
 expect -re {\(2/[2-9][0-9]*\)}
+send -- "\033\[6~"
+expect -re {\([3-9][0-9]*/[2-9][0-9]*\)}
+send -- "\033\[5~"
+expect -re {\([1-9][0-9]*/[2-9][0-9]*\)}
+send -- "\033\[F"
+expect -re {\([2-9][0-9]*/[2-9][0-9]*\)}
+send -- "\033\[H"
+expect -re {\(1/[2-9][0-9]*\)}
 send -- "q"
 expect "NORMAL"
 sleep 0.2
@@ -390,6 +485,37 @@ else
     FAIL=$((FAIL + 1))
 fi
 
+COMMAND_INPUT_WRAP_SCRIPT="$STATE_DIR/command-input-wrap.expect"
+cat >"$COMMAND_INPUT_WRAP_SCRIPT" <<EOF
+set timeout 10
+stty rows 10 columns 40
+spawn ssh $SSH_OPTS anonymous@127.0.0.1
+sleep 1
+send -- "wrapcmd\r"
+expect ":help"
+send -- "\033"
+expect "NORMAL"
+send -- ":"
+expect ":"
+send -- "search aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaatail"
+expect -re {<a+tail}
+send -- "\003"
+expect "NORMAL"
+sleep 0.2
+send -- "\003"
+expect eof
+EOF
+
+if expect "$COMMAND_INPUT_WRAP_SCRIPT" >"$STATE_DIR/command-input-wrap.log" 2>&1; then
+    echo "✓ long command input stays on one status line"
+    PASS=$((PASS + 1))
+else
+    echo "x long command input display failed"
+    sed -n '1,220p' "$STATE_DIR/command-input-wrap.log"
+    sed -n '1,120p' "$STATE_DIR/server.log"
+    FAIL=$((FAIL + 1))
+fi
+
 SYSTEM_MESSAGES_SCRIPT="$STATE_DIR/system-messages.expect"
 cat >"$SYSTEM_MESSAGES_SCRIPT" <<EOF
 set timeout 10

tests/test_user_lifecycle.sh

@@ -185,6 +185,12 @@ expect "alpha"
 expect "q:关闭"
 send -- "q"
 expect "NORMAL"
+send -- "/alpha\r"
+expect "搜索"
+expect "alpha"
+expect "q:关闭"
+send -- "q"
+expect "NORMAL"
 send -- ":"
 expect ":"
 send -- "mute-joins\r"