我尝试在rust中执行this tutorial,到目前为止,我在将C库连接到Rust中时遇到很多问题。
C等效代码:
#include <stdio.h>
#include <stdlib.h>
#include <editline/readline.h>
#include <editline/history.h>
int main(int argc, char** argv) {
/* Print Version and Exit Information */
puts("Lispy Version 0.0.0.0.1");
puts("Press Ctrl+c to Exit\n");
/* In a never ending loop */
while (1) {
/* Output our prompt and get input */
char* input = readline("lispy> ");
/* Add input to history */
add_history(input);
/* Echo input back to user */
printf("No you're a %s\n", input);
/* Free retrived input */
free(input);
}
return 0;
}
到目前为止,我得到了:
extern crate libc;
use std::c_str;
#[link(name = "readline")]
extern {
fn readline (p: *const libc::c_char) -> *const libc::c_char;
}
fn rust_readline (prompt: &str) -> Option<Box<str>> {
let cprmt = prompt.to_c_str();
cprmt.with_ref(|c_buf| {
unsafe {
let ret = c_str::CString::new (readline (c_buf), true);
ret.as_str().map(|ret| ret.to_owned())
}
})
}
fn main() {
println!("Lispy Version 0.0.1");
println!("Press Ctrl+c to Exit.\n");
// I want to have "history" in Linux of this:
//
// loop {
// print!("lispy> ");
// let input = io::stdin().read_line().unwrap();
// print!("No you're a {}", input);
// }
loop {
let val = rust_readline ("lispy> ");
match val {
None => { break }
_ => {
let input = val.unwrap();
println!("No you're a {}", input);
}
}
}
}
具体地说,我在rust_readline函数中遇到问题,我不太了解内部的工作。
最佳答案
编辑Cargo.toml,输入以下内容:
[dependencies.readline]
git = "https://github.com/shaleh/rust-readline"
代码已更正:
extern crate readline;
fn main() {
println!("Lispy Version 0.0.1");
println!("Press Ctrl+c to Exit.\n");
loop {
let input = readline::readline("lispy> ").unwrap();
readline::add_history(input.as_str());
println!("No you're a {}", input);
}
}
开心的Lisping :-)。