將readline與Rust聯繫起來

Question

我試着做this tutorial生鏽，到目前爲止，我有很多將C庫接入Rust的問題。

等價的C代碼：

#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; 
} 

到目前爲止，我得到這個：

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); 
      } 
     } 
    } 
} 

與rust_readline功能Especifically，我有問題，我不很明白什麼是做內部。

Answer 1

編輯Cargo.toml，把這個：

[dependencies.readline] 

git = "https://github.com/shaleh/rust-readline" 

代碼更正：

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); 
    } 
} 

快樂口齒不清:-)。