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112 lines
3.5 KiB
Rust
112 lines
3.5 KiB
Rust
//! utilities for calling CPython.
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//!
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//! CPythonを呼び出すためのユーティリティー
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use std::process::Command;
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use crate::serialize::get_magic_num_from_bytes;
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pub fn which_python() -> String {
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let (cmd, python) = if cfg!(windows) {
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("where", "python")
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} else {
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("which", "python3")
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};
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let out = Command::new(cmd)
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.arg(python)
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.output()
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.expect("python not found");
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let res = String::from_utf8(out.stdout).unwrap();
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let res = res.split('\n').next().unwrap_or("").replace('\r', "");
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if res.is_empty() {
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println!("python not found");
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std::process::exit(1);
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} else if res.contains("pyenv") {
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println!("cannot use pyenv");
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std::process::exit(1);
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}
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res
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}
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pub fn detect_magic_number() -> u32 {
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let out = if cfg!(windows) {
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Command::new("cmd")
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.arg("/C")
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.arg(which_python())
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.arg("-c")
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.arg("import importlib.util as util;print(util.MAGIC_NUMBER.hex())")
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.output()
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.expect("cannot get the magic number from python")
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} else {
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let python_command = format!(
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"{} -c 'import importlib.util as util;print(util.MAGIC_NUMBER.hex())'",
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which_python()
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);
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Command::new("sh")
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.arg("-c")
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.arg(python_command)
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.output()
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.expect("cannot get the magic number from python")
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};
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let s_hex_magic_num = String::from_utf8(out.stdout).unwrap();
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let first_byte = u8::from_str_radix(&s_hex_magic_num[0..=1], 16).unwrap();
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let second_byte = u8::from_str_radix(&s_hex_magic_num[2..=3], 16).unwrap();
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get_magic_num_from_bytes(&[first_byte, second_byte, 0, 0])
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}
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/// executes over a shell, cause `python` may not exist as an executable file (like pyenv)
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pub fn exec_pyc<S: Into<String>>(file: S) {
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let mut out = if cfg!(windows) {
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Command::new("cmd")
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.arg("/C")
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.arg(which_python())
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.arg(&file.into())
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.spawn()
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.expect("cannot execute python")
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} else {
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let python_command = format!("{} {}", which_python(), file.into());
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Command::new("sh")
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.arg("-c")
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.arg(python_command)
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.spawn()
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.expect("cannot execute python")
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};
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out.wait().expect("python doesn't work");
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}
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/// evaluates over a shell, cause `python` may not exist as an executable file (like pyenv)
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pub fn eval_pyc<S: Into<String>>(file: S) -> String {
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let out = if cfg!(windows) {
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Command::new("cmd")
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.arg("/C")
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.arg(which_python())
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.arg(&file.into())
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.spawn()
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.expect("cannot execute python")
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} else {
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let python_command = format!("{} {}", which_python(), file.into());
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Command::new("sh")
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.arg("-c")
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.arg(python_command)
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.spawn()
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.expect("cannot execute python")
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};
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let out = out.wait_with_output().expect("python doesn't work");
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String::from_utf8_lossy(&out.stdout).to_string()
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}
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pub fn exec_py(code: &str) {
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if cfg!(windows) {
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Command::new(which_python())
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.arg("-c")
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.arg(code)
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.spawn()
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.expect("cannot execute python");
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} else {
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let python_command = format!("{} -c \"{}\"", which_python(), code);
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Command::new("sh")
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.arg("-c")
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.arg(python_command)
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.spawn()
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.expect("cannot execute python");
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}
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}
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