Colocate more of bash parsing (#6489)

Move a few callsites that were detecting `bash -lc` into a shared
helper.

codex-rs/core/src/bash.rs

@@ -88,17 +88,33 @@ pub fn try_parse_word_only_commands_sequence(tree: &Tree, src: &str) -> Option<V
     Some(commands)
 }
 
+pub fn is_well_known_sh_shell(shell: &str) -> bool {
+    if shell == "bash" || shell == "zsh" {
+        return true;
+    }
+
+    let shell_name = std::path::Path::new(shell)
+        .file_name()
+        .and_then(|s| s.to_str())
+        .unwrap_or(shell);
+    matches!(shell_name, "bash" | "zsh")
+}
+
+pub fn extract_bash_command(command: &[String]) -> Option<(&str, &str)> {
+    let [shell, flag, script] = command else {
+        return None;
+    };
+    if flag != "-lc" || !is_well_known_sh_shell(shell) {
+        return None;
+    }
+    Some((shell, script))
+}
+
 /// Returns the sequence of plain commands within a `bash -lc "..."` or
 /// `zsh -lc "..."` invocation when the script only contains word-only commands
 /// joined by safe operators.
 pub fn parse_shell_lc_plain_commands(command: &[String]) -> Option<Vec<Vec<String>>> {
-    let [shell, flag, script] = command else {
-        return None;
-    };
-
-    if flag != "-lc" || !(shell == "bash" || shell == "zsh") {
-        return None;
-    }
+    let (_, script) = extract_bash_command(command)?;
 
     let tree = try_parse_shell(script)?;
     try_parse_word_only_commands_sequence(&tree, script)

codex-rs/core/src/parse_command.rs

@@ -1,3 +1,4 @@
+use crate::bash::extract_bash_command;
 use crate::bash::try_parse_shell;
 use crate::bash::try_parse_word_only_commands_sequence;
 use codex_protocol::parse_command::ParsedCommand;
@@ -853,6 +854,29 @@ mod tests {
             }],
         );
     }
+
+    #[test]
+    fn bin_bash_lc_sed() {
+        assert_parsed(
+            &shlex_split_safe("/bin/bash -lc 'sed -n '1,10p' Cargo.toml'"),
+            vec![ParsedCommand::Read {
+                cmd: "sed -n '1,10p' Cargo.toml".to_string(),
+                name: "Cargo.toml".to_string(),
+                path: PathBuf::from("Cargo.toml"),
+            }],
+        );
+    }
+    #[test]
+    fn bin_zsh_lc_sed() {
+        assert_parsed(
+            &shlex_split_safe("/bin/zsh -lc 'sed -n '1,10p' Cargo.toml'"),
+            vec![ParsedCommand::Read {
+                cmd: "sed -n '1,10p' Cargo.toml".to_string(),
+                name: "Cargo.toml".to_string(),
+                path: PathBuf::from("Cargo.toml"),
+            }],
+        );
+    }
 }
 
 pub fn parse_command_impl(command: &[String]) -> Vec<ParsedCommand> {
@@ -1166,18 +1190,13 @@ fn parse_find_query_and_path(tail: &[String]) -> (Option<String>, Option<String>
 }
 
 fn parse_shell_lc_commands(original: &[String]) -> Option<Vec<ParsedCommand>> {
-    let [shell, flag, script] = original else {
-        return None;
-    };
-    if flag != "-lc" || !(shell == "bash" || shell == "zsh") {
-        return None;
-    }
+    let (_, script) = extract_bash_command(original)?;
+
     if let Some(tree) = try_parse_shell(script)
         && let Some(all_commands) = try_parse_word_only_commands_sequence(&tree, script)
         && !all_commands.is_empty()
     {
-        let script_tokens = shlex_split(script)
-            .unwrap_or_else(|| vec![shell.clone(), flag.clone(), script.clone()]);
+        let script_tokens = shlex_split(script).unwrap_or_else(|| vec![script.to_string()]);
         // Strip small formatting helpers (e.g., head/tail/awk/wc/etc) so we
         // bias toward the primary command when pipelines are present.
         // First, drop obvious small formatting helpers (e.g., wc/awk/etc).
@@ -1186,7 +1205,7 @@ fn parse_shell_lc_commands(original: &[String]) -> Option<Vec<ParsedCommand>> {
         let filtered_commands = drop_small_formatting_commands(all_commands);
         if filtered_commands.is_empty() {
             return Some(vec![ParsedCommand::Unknown {
-                cmd: script.clone(),
+                cmd: script.to_string(),
             }]);
         }
         // Build parsed commands, tracking `cd` segments to compute effective file paths.
@@ -1250,7 +1269,7 @@ fn parse_shell_lc_commands(original: &[String]) -> Option<Vec<ParsedCommand>> {
                             });
                             if has_pipe && has_sed_n {
                                 ParsedCommand::Read {
-                                    cmd: script.clone(),
+                                    cmd: script.to_string(),
                                     name,
                                     path,
                                 }
@@ -1295,7 +1314,7 @@ fn parse_shell_lc_commands(original: &[String]) -> Option<Vec<ParsedCommand>> {
         return Some(commands);
     }
     Some(vec![ParsedCommand::Unknown {
-        cmd: script.clone(),
+        cmd: script.to_string(),
     }])
 }
 

codex-rs/tui/src/exec_command.rs

@@ -1,6 +1,7 @@
 use std::path::Path;
 use std::path::PathBuf;
 
+use codex_core::bash::extract_bash_command;
 use dirs::home_dir;
 use shlex::try_join;
 
@@ -8,19 +9,11 @@ pub(crate) fn escape_command(command: &[String]) -> String {
     try_join(command.iter().map(String::as_str)).unwrap_or_else(|_| command.join(" "))
 }
 
-fn is_login_shell_with_lc(shell: &str) -> bool {
-    let shell_name = std::path::Path::new(shell)
-        .file_name()
-        .and_then(|s| s.to_str())
-        .unwrap_or(shell);
-    matches!(shell_name, "bash" | "zsh")
-}
-
 pub(crate) fn strip_bash_lc_and_escape(command: &[String]) -> String {
-    match command {
-        [first, second, third] if is_login_shell_with_lc(first) && second == "-lc" => third.clone(),
-        _ => escape_command(command),
+    if let Some((_, script)) = extract_bash_command(command) {
+        return script.to_string();
     }
+    escape_command(command)
 }
 
 /// If `path` is absolute and inside $HOME, return the part *after* the home