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🧹 Extract REPL metacommand handling to reduce nesting #87

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Merged
Tcode-Motion merged 1 commit into from
Sep 8, 2026
Merged

🧹 Extract REPL metacommand handling to reduce nesting #87

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172 changes: 92 additions & 80 deletions cli/src/commands/repl.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -68,86 +68,8 @@ pub fn execute() -> ExitCode {
// Process REPL Metacommand
let parts: Vec<&str> = trimmed.split_whitespace().collect();
let cmd = parts[0];
match cmd {
":quit" | ":q" => {
println!("Goodbye!");
break;
}
":help" | ":h" => {
print_help();
}
":clear" | ":c" => {
interpreter = techscript_interpreter::Interpreter::new();
println!("REPL environment state cleared.");
}
":history" => {
for (i, h) in session_history.iter().enumerate() {
println!("{:>4}: {}", i + 1, h);
}
}
":type" => {
if parts.len() < 2 {
println!("Usage: :type <expr>");
} else {
let expr = parts[1..].join(" ");
evaluate_type(&expr, &mut interpreter);
}
}
":ast" => {
if parts.len() < 2 {
println!("Usage: :ast <expr>");
} else {
let expr = parts[1..].join(" ");
dump_repl_ast(&expr);
}
}
":ir" => {
if parts.len() < 2 {
println!("Usage: :ir <expr>");
} else {
let expr = parts[1..].join(" ");
dump_repl_ir(&expr);
}
}
":bytecode" => {
if parts.len() < 2 {
println!("Usage: :bytecode <expr>");
} else {
let expr = parts[1..].join(" ");
dump_repl_bytecode(&expr);
}
}
":load" => {
if parts.len() < 2 {
println!("Usage: :load <file>");
} else {
let file = parts[1];
if let Ok(content) = std::fs::read_to_string(file) {
eval_code(&content, &mut interpreter);
} else {
println!("Error: Could not read file '{}'.", file);
}
}
}
":save" => {
if parts.len() < 2 {
println!("Usage: :save <file>");
} else {
let file = parts[1];
let session_data = session_history.join("\n");
if std::fs::write(file, session_data).is_ok() {
println!("Session history saved to '{}'.", file);
} else {
println!("Error: Could not write to file '{}'.", file);
}
}
}
other => {
println!(
"Unknown command '{}'. Type ':help' for instructions.",
other
);
}
if handle_metacommand(cmd, &parts, &mut interpreter, &session_history) {
break;
}
} else {
// Regular statement/expression evaluation
Expand All @@ -172,6 +94,96 @@ pub fn execute() -> ExitCode {
ExitCode::Success
}

fn handle_metacommand(
cmd: &str,
parts: &[&str],
interpreter: &mut techscript_interpreter::Interpreter,
session_history: &[String],
) -> bool {
match cmd {
":quit" | ":q" => {
println!("Goodbye!");
return true;
}
":help" | ":h" => {
print_help();
}
":clear" | ":c" => {
*interpreter = techscript_interpreter::Interpreter::new();
println!("REPL environment state cleared.");
}
":history" => {
for (i, h) in session_history.iter().enumerate() {
println!("{:>4}: {}", i + 1, h);
}
}
":type" => {
if parts.len() < 2 {
println!("Usage: :type <expr>");
} else {
let expr = parts[1..].join(" ");
evaluate_type(&expr, interpreter);
}
}
":ast" => {
if parts.len() < 2 {
println!("Usage: :ast <expr>");
} else {
let expr = parts[1..].join(" ");
dump_repl_ast(&expr);
}
}
":ir" => {
if parts.len() < 2 {
println!("Usage: :ir <expr>");
} else {
let expr = parts[1..].join(" ");
dump_repl_ir(&expr);
}
}
":bytecode" => {
if parts.len() < 2 {
println!("Usage: :bytecode <expr>");
} else {
let expr = parts[1..].join(" ");
dump_repl_bytecode(&expr);
}
}
":load" => {
if parts.len() < 2 {
println!("Usage: :load <file>");
} else {
let file = parts[1];
if let Ok(content) = std::fs::read_to_string(file) {
eval_code(&content, interpreter);
} else {
println!("Error: Could not read file '{}'.", file);
}
}
}
":save" => {
if parts.len() < 2 {
println!("Usage: :save <file>");
} else {
let file = parts[1];
let session_data = session_history.join("\n");
if std::fs::write(file, session_data).is_ok() {
println!("Session history saved to '{}'.", file);
} else {
println!("Error: Could not write to file '{}'.", file);
}
}
}
other => {
println!(
"Unknown command '{}'. Type ':help' for instructions.",
other
);
}
}
false
}

fn print_help() {
println!("TechScript REPL Shell Metacommands:");
println!(" :help, :h Show this help text");
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