tui: centralize slash command serialization

Introduce a small slash command invocation serializer and consolidate built-in command metadata behind a single spec table without changing slash command runtime behavior.

Co-authored-by: Codex <noreply@openai.com>

Author: charley-oai

codex-rs/tui/src/bottom_pane/chat_composer.rs

@@ -192,6 +192,7 @@ use crate::render::Insets;
 use crate::render::RectExt;
 use crate::render::renderable::Renderable;
 use crate::slash_command::SlashCommand;
+use crate::slash_command_invocation::SlashCommandInvocation;
 use crate::style::user_message_style;
 use codex_protocol::custom_prompts::CustomPrompt;
 use codex_protocol::custom_prompts::PROMPTS_CMD_PREFIX;
@@ -1416,12 +1417,13 @@ impl ChatComposer {
                                 return (InputResult::Command(cmd), true);
                             }
 
-                            let starts_with_cmd = first_line
-                                .trim_start()
-                                .starts_with(&format!("/{}", cmd.command()));
+                            let bare_command =
+                                SlashCommandInvocation::bare(cmd).into_prefixed_string();
+                            let starts_with_cmd =
+                                first_line.trim_start().starts_with(&bare_command);
                             if !starts_with_cmd {
                                 self.textarea
-                                    .set_text_clearing_elements(&format!("/{} ", cmd.command()));
+                                    .set_text_clearing_elements(&format!("{bare_command} "));
                             }
                             if !self.textarea.text().is_empty() {
                                 cursor_target = Some(self.textarea.text().len());

codex-rs/tui/src/bottom_pane/command_popup.rs

@@ -14,11 +14,6 @@ use codex_protocol::custom_prompts::CustomPrompt;
 use codex_protocol::custom_prompts::PROMPTS_CMD_PREFIX;
 use std::collections::HashSet;
 
-// Hide alias commands in the default popup list so each unique action appears once.
-// `quit` is an alias of `exit`, so we skip `quit` here.
-// `approvals` is an alias of `permissions`.
-const ALIAS_COMMANDS: &[SlashCommand] = &[SlashCommand::Quit, SlashCommand::Approvals];
-
 /// A selectable item in the popup: either a built-in command or a user prompt.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub(crate) enum CommandItem {
@@ -143,7 +138,7 @@ impl CommandPopup {
         if filter.is_empty() {
             // Built-ins first, in presentation order.
             for (_, cmd) in self.builtins.iter() {
-                if ALIAS_COMMANDS.contains(cmd) {
+                if !cmd.show_in_command_popup() {
                     continue;
                 }
                 out.push((CommandItem::Builtin(*cmd), None));

codex-rs/tui/src/lib.rs

@@ -122,6 +122,7 @@ mod session_log;
 mod shimmer;
 mod skills_helpers;
 mod slash_command;
+mod slash_command_invocation;
 mod status;
 mod status_indicator_widget;
 mod streaming;