chore: rename codex-command to codex-shell-command (#11378)

This addresses some post-merge feedback on
https://github.com/openai/codex/pull/11361:

- crate rename
- reuse `detect_shell_type()` utility

codex-rs/core/src/lib.rs

@@ -56,6 +56,7 @@ mod proposed_plan_parser;
 mod sandbox_tags;
 pub mod sandboxing;
 mod session_prefix;
+mod shell_detect;
 mod stream_events_utils;
 mod tagged_block_parser;
 mod text_encoding;
@@ -129,11 +130,11 @@ mod state;
 mod tasks;
 mod user_shell_command;
 pub mod util;
-pub use codex_command::bash;
-pub use codex_command::is_dangerous_command;
-pub use codex_command::is_safe_command;
-pub use codex_command::parse_command;
-pub use codex_command::powershell;
+pub use codex_shell_command::bash;
+pub use codex_shell_command::is_dangerous_command;
+pub use codex_shell_command::is_safe_command;
+pub use codex_shell_command::parse_command;
+pub use codex_shell_command::powershell;
 
 pub use apply_patch::CODEX_APPLY_PATCH_ARG1;
 pub use client::X_CODEX_TURN_METADATA_HEADER;

codex-rs/core/src/shell.rs

@@ -1,3 +1,4 @@
+use crate::shell_detect::detect_shell_type;
 use crate::shell_snapshot::ShellSnapshot;
 use serde::Deserialize;
 use serde::Serialize;
@@ -244,27 +245,6 @@ pub fn get_shell(shell_type: ShellType, path: Option<&PathBuf>) -> Option<Shell>
     }
 }
 
-pub fn detect_shell_type(shell_path: &PathBuf) -> Option<ShellType> {
-    match shell_path.as_os_str().to_str() {
-        Some("zsh") => Some(ShellType::Zsh),
-        Some("sh") => Some(ShellType::Sh),
-        Some("cmd") => Some(ShellType::Cmd),
-        Some("bash") => Some(ShellType::Bash),
-        Some("pwsh") => Some(ShellType::PowerShell),
-        Some("powershell") => Some(ShellType::PowerShell),
-        _ => {
-            let shell_name = shell_path.file_stem();
-            if let Some(shell_name) = shell_name
-                && shell_name != shell_path
-            {
-                detect_shell_type(&PathBuf::from(shell_name))
-            } else {
-                None
-            }
-        }
-    }
-}
-
 pub fn default_user_shell() -> Shell {
     default_user_shell_from_path(get_user_shell_path())
 }

codex-rs/core/src/shell_detect.rs

@@ -0,0 +1,24 @@
+use crate::shell::ShellType;
+use std::path::Path;
+use std::path::PathBuf;
+
+pub(crate) fn detect_shell_type(shell_path: &PathBuf) -> Option<ShellType> {
+    match shell_path.as_os_str().to_str() {
+        Some("zsh") => Some(ShellType::Zsh),
+        Some("sh") => Some(ShellType::Sh),
+        Some("cmd") => Some(ShellType::Cmd),
+        Some("bash") => Some(ShellType::Bash),
+        Some("pwsh") => Some(ShellType::PowerShell),
+        Some("powershell") => Some(ShellType::PowerShell),
+        _ => {
+            let shell_name = shell_path.file_stem();
+            if let Some(shell_name) = shell_name {
+                let shell_name_path = Path::new(shell_name);
+                if shell_name_path != Path::new(shell_path) {
+                    return detect_shell_type(&shell_name_path.to_path_buf());
+                }
+            }
+            None
+        }
+    }
+}