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mod helper;

use rustpython_parser::error::{LexicalErrorType, ParseErrorType};

use rustpython_vm::readline::{Readline, ReadlineResult};

use rustpython_vm::{

builtins::PyBaseExceptionRef,

compile::{self, CompileError, CompileErrorType},

scope::Scope,

AsObject, PyResult, VirtualMachine,

};

enum ShellExecResult {

Ok,

PyErr(PyBaseExceptionRef),

Continue,

}

fn shell_exec(vm: &VirtualMachine, source: &str, scope: Scope) -> ShellExecResult {

match vm.compile(source, compile::Mode::Single, "<stdin>".to_owned()) {

Ok(code) => match vm.run_code_obj(code, scope) {

Ok(_val) => ShellExecResult::Ok,

Err(err) => ShellExecResult::PyErr(err),

Err(CompileError {

error: CompileErrorType::Parse(ParseErrorType::Lexical(LexicalErrorType::Eof)),

})

| Err(CompileError {

error: CompileErrorType::Parse(ParseErrorType::Eof),

}) => ShellExecResult::Continue,

Err(err) => ShellExecResult::PyErr(vm.new_syntax_error(&err)),

}

pub fn run_shell(vm: &VirtualMachine, scope: Scope) -> PyResult<()> {

let mut repl = Readline::new(helper::ShellHelper::new(vm, scope.globals.clone()));

let mut full_input = String::new();

// Retrieve a `history_path_str` dependent on the OS

let repl_history_path = match dirs::config_dir() {

Some(mut path) => {

path.push("rustpython");

path.push("repl_history.txt");

path

}

None => ".repl_history.txt".into(),

};

if repl.load_history(&repl_history_path).is_err() {

println!("No previous history.");

}

let mut continuing = false;

loop {

let prompt_name = if continuing { "ps2" } else { "ps1" };

let prompt = vm

.sys_module

.clone()

.get_attr(prompt_name, vm)

.and_then(|prompt| prompt.str(vm));

let prompt = match prompt {

Ok(ref s) => s.as_str(),

Err(_) => "",

};

let result = match repl.readline(prompt) {

ReadlineResult::Line(line) => {

debug!("You entered {:?}", line);

repl.add_history_entry(line.trim_end()).unwrap();

let stop_continuing = line.is_empty();

if full_input.is_empty() {

full_input = line;

} else {

full_input.push_str(&line);

}

full_input.push('\n');

if continuing {

if stop_continuing {

continuing = false;

} else {

continue;

}

match shell_exec(vm, &full_input, scope.clone()) {

ShellExecResult::Ok => {

full_input.clear();

Ok(())

}

ShellExecResult::Continue => {

continuing = true;

Ok(())

}

ShellExecResult::PyErr(err) => {

full_input.clear();

Err(err)

}

ReadlineResult::Interrupt => {

continuing = false;

full_input.clear();

let keyboard_interrupt =

vm.new_exception_empty(vm.ctx.exceptions.keyboard_interrupt.to_owned());

Err(keyboard_interrupt)

}

ReadlineResult::Eof => {

break;

}

ReadlineResult::EncodingError => {

eprintln!("Invalid UTF-8 entered");

Ok(())

}

ReadlineResult::Other(err) => {

eprintln!("Readline error: {:?}", err);

break;

}

ReadlineResult::Io(err) => {

eprintln!("IO error: {:?}", err);

break;

}

};

if let Err(exc) = result {

if exc.fast_isinstance(vm.ctx.exceptions.system_exit) {

repl.save_history(&repl_history_path).unwrap();

return Err(exc);

}

vm.print_exception(exc);

}

repl.save_history(&repl_history_path).unwrap();

Ok(())

}

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