i18n: localize command mode guidance

docs/CHANGELOG.md

@@ -8,6 +8,8 @@
   hints, help language, and `:support`.
 - Added `:lang <en|zh>` so users can switch the interactive UI language for
   their current session.
+- COMMAND-mode `:help`, unknown-command guidance, language command output, and
+  continuation prompts now follow the session UI language.
 
 ### Changed
 - NORMAL mode now opens at the latest visible messages instead of the oldest

src/commands.c

@@ -104,6 +104,58 @@ static const char *suggest_command(const char *cmd) {
     return best_distance <= 2 ? best : NULL;
 }
 
+static void append_command_help(char *output, size_t buf_size, size_t *pos,
+                                help_lang_t lang) {
+    if (lang == LANG_ZH) {
+        buffer_appendf(output, buf_size, pos,
+                       "========================================\n"
+                       "    可用命令\n"
+                       "========================================\n"
+                       "list, users, who    - 显示在线用户\n"
+                       "nick/name <name>    - 修改昵称\n"
+                       "msg/w <user> <text> - 私聊用户\n"
+                       "inbox               - 查看私聊历史\n"
+                       "last [N]            - 查看最近 N 条消息\n"
+                       "search <keyword>    - 搜索消息历史\n"
+                       "mute-joins          - 切换加入/离开提示\n"
+                       "support             - 显示快速支持指南\n"
+                       "lang [en|zh]        - 查看或切换界面语言\n"
+                       "help, commands      - 显示此帮助\n"
+                       "clear, cls          - 清空命令输出\n"
+                       "q, quit, exit       - 断开连接\n"
+                       "上/下方向键         - 命令历史\n"
+                       "========================================\n"
+                       "INSERT 模式:\n"
+                       "  /me <action>      - 发送动作消息\n"
+                       "  @username         - 提及用户并响铃提示\n"
+                       "========================================\n");
+        return;
+    }
+
+    buffer_appendf(output, buf_size, pos,
+                   "========================================\n"
+                   "    Available Commands\n"
+                   "========================================\n"
+                   "list, users, who    - Show online users\n"
+                   "nick/name <name>    - Change nickname\n"
+                   "msg/w <user> <text> - Whisper to user (private)\n"
+                   "inbox               - Show whisper history\n"
+                   "last [N]            - Show last N messages\n"
+                   "search <keyword>    - Search message history\n"
+                   "mute-joins          - Toggle join/leave notices\n"
+                   "support             - Show quick support guide\n"
+                   "lang [en|zh]        - Show or switch UI language\n"
+                   "help, commands      - Show this help\n"
+                   "clear, cls          - Clear command output\n"
+                   "q, quit, exit       - Disconnect\n"
+                   "Up/Down arrows      - Command history\n"
+                   "========================================\n"
+                   "In INSERT mode:\n"
+                   "  /me <action>      - Send action message\n"
+                   "  @username         - Mention (bell notify)\n"
+                   "========================================\n");
+}
+
 void commands_dispatch(client_t *client) {
     char cmd_buf[256];
     strncpy(cmd_buf, client->command_input, sizeof(cmd_buf) - 1);
@@ -167,28 +219,7 @@ void commands_dispatch(client_t *client) {
         pthread_rwlock_unlock(&g_room->lock);
 
     } else if (strcmp(cmd, "help") == 0 || strcmp(cmd, "commands") == 0) {
-        buffer_appendf(output, sizeof(output), &pos,
+        append_command_help(output, sizeof(output), &pos, client->help_lang);
-                       "========================================\n"
-                       "    Available Commands / 可用命令\n"
-                       "========================================\n"
-                       "list, users, who    - Show online users\n"
-                       "nick/name <name>    - Change nickname\n"
-                       "msg/w <user> <text> - Whisper to user (private)\n"
-                       "inbox               - Show whisper history\n"
-                       "last [N]            - Show last N messages\n"
-                       "search <keyword>    - Search message history\n"
-                       "mute-joins          - Toggle join/leave notices\n"
-                       "support             - Show quick support guide\n"
-                       "lang [en|zh]        - Show or switch UI language\n"
-                       "help, commands      - Show this help\n"
-                       "clear, cls          - Clear command output\n"
-                       "q, quit, exit       - Disconnect\n"
-                       "Up/Down arrows      - Command history\n"
-                       "========================================\n"
-                       "In INSERT mode:\n"
-                       "  /me <action>      - Send action message\n"
-                       "  @username         - Mention (bell notify)\n"
-                       "========================================\n");
 
     } else if (strcmp(cmd, "support") == 0 || strcmp(cmd, "guide") == 0) {
         support_append_interactive_panel(output, sizeof(output), &pos,
@@ -207,19 +238,38 @@ void commands_dispatch(client_t *client) {
         }
 
         if (!arg || arg[0] == '\0') {
-            buffer_appendf(output, sizeof(output), &pos,
+            if (client->help_lang == LANG_ZH) {
-                           "Current language: %s\n"
+                buffer_appendf(output, sizeof(output), &pos,
-                           "Usage: lang <en|zh>\n",
+                               "当前语言: %s\n"
-                           i18n_lang_code(client->help_lang));
+                               "用法: lang <en|zh>\n",
+                               i18n_lang_code(client->help_lang));
+            } else {
+                buffer_appendf(output, sizeof(output), &pos,
+                               "Current language: %s\n"
+                               "Usage: lang <en|zh>\n",
+                               i18n_lang_code(client->help_lang));
+            }
         } else if (i18n_try_parse_lang(arg, &next_lang)) {
             client->help_lang = next_lang;
-            buffer_appendf(output, sizeof(output), &pos,
+            if (client->help_lang == LANG_ZH) {
-                           "Language set to: %s\n",
+                buffer_appendf(output, sizeof(output), &pos,
-                           i18n_lang_code(client->help_lang));
+                               "语言已切换为: %s\n",
+                               i18n_lang_code(client->help_lang));
+            } else {
+                buffer_appendf(output, sizeof(output), &pos,
+                               "Language set to: %s\n",
+                               i18n_lang_code(client->help_lang));
+            }
         } else {
-            buffer_appendf(output, sizeof(output), &pos,
+            if (client->help_lang == LANG_ZH) {
-                           "Unsupported language: %s\n"
+                buffer_appendf(output, sizeof(output), &pos,
-                           "Usage: lang <en|zh>\n", arg);
+                               "不支持的语言: %s\n"
+                               "用法: lang <en|zh>\n", arg);
+            } else {
+                buffer_appendf(output, sizeof(output), &pos,
+                               "Unsupported language: %s\n"
+                               "Usage: lang <en|zh>\n", arg);
+            }
         }
 
     } else if (strncmp(cmd, "msg ", 4) == 0 || strncmp(cmd, "w ", 2) == 0) {
@@ -460,17 +510,27 @@ void commands_dispatch(client_t *client) {
     } else {
         const char *suggestion = suggest_command(cmd);
         buffer_appendf(output, sizeof(output), &pos,
-                       "Unknown command: %s\n", cmd);
+                       client->help_lang == LANG_ZH ?
+                       "未知命令: %s\n" : "Unknown command: %s\n", cmd);
         if (suggestion) {
-            buffer_appendf(output, sizeof(output), &pos,
+            if (client->help_lang == LANG_ZH) {
-                           "Did you mean :%s?\n", suggestion);
+                buffer_appendf(output, sizeof(output), &pos,
+                               "你是想输入 :%s 吗?\n", suggestion);
+            } else {
+                buffer_appendf(output, sizeof(output), &pos,
+                               "Did you mean :%s?\n", suggestion);
+            }
         }
         buffer_appendf(output, sizeof(output), &pos,
+                       client->help_lang == LANG_ZH ?
+                       "输入 :support 查看引导，或 :help 查看命令\n" :
                        "Type :support for guidance or :help for commands\n");
     }
 
 cmd_done:
     buffer_appendf(output, sizeof(output), &pos,
+                   client->help_lang == LANG_ZH ?
+                   "\n按任意键继续..." :
                    "\nPress any key to continue...");
 
     snprintf(client->command_output, sizeof(client->command_output), "%s", output);

tests/test_interactive_input.sh

@@ -146,7 +146,7 @@ send -- ":"
 expect ":"
 send -- "support\r"
 expect "支持"
-expect "Press any key"
+expect "按任意键"
 send -- "q"
 expect "NORMAL"
 send -- ":"
@@ -184,8 +184,8 @@ expect "NORMAL"
 send -- ":"
 expect ":"
 send -- "suport\r"
-expect "Did you mean :support"
+expect "你是想输入 :support 吗?"
-expect "Press any key"
+expect "按任意键"
 send -- "q"
 sleep 0.2
 send -- "\003"