rust/src/libextra/rl.rs

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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
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// FIXME #3921. This is unsafe because linenoise uses global mutable
// state without mutexes.
use std::libc::{c_char, c_int};
use std::local_data;
use std::str;
pub mod rustrt {
use std::libc::{c_char, c_int};
pub extern {
pub unsafe fn linenoise(prompt: *c_char) -> *c_char;
pub unsafe fn linenoiseHistoryAdd(line: *c_char) -> c_int;
pub unsafe fn linenoiseHistorySetMaxLen(len: c_int) -> c_int;
pub unsafe fn linenoiseHistorySave(file: *c_char) -> c_int;
pub unsafe fn linenoiseHistoryLoad(file: *c_char) -> c_int;
pub unsafe fn linenoiseSetCompletionCallback(callback: *u8);
pub unsafe fn linenoiseAddCompletion(completions: *(), line: *c_char);
}
}
/// Add a line to history
pub unsafe fn add_history(line: &str) -> bool {
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do str::as_c_str(line) |buf| {
rustrt::linenoiseHistoryAdd(buf) == 1 as c_int
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}
}
/// Set the maximum amount of lines stored
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pub unsafe fn set_history_max_len(len: int) -> bool {
rustrt::linenoiseHistorySetMaxLen(len as c_int) == 1 as c_int
}
/// Save line history to a file
pub unsafe fn save_history(file: &str) -> bool {
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do str::as_c_str(file) |buf| {
rustrt::linenoiseHistorySave(buf) == 1 as c_int
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}
}
/// Load line history from a file
pub unsafe fn load_history(file: &str) -> bool {
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do str::as_c_str(file) |buf| {
rustrt::linenoiseHistoryLoad(buf) == 1 as c_int
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}
}
/// Print out a prompt and then wait for input and return it
pub unsafe fn read(prompt: &str) -> Option<~str> {
do str::as_c_str(prompt) |buf| {
let line = rustrt::linenoise(buf);
if line.is_null() { None }
else { Some(str::raw::from_c_str(line)) }
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}
}
pub type CompletionCb<'self> = @fn(~str, &'self fn(~str));
fn complete_key(_v: @CompletionCb) {}
/// Bind to the main completion callback
pub unsafe fn complete(cb: CompletionCb) {
local_data::local_data_set(complete_key, @(cb));
extern fn callback(line: *c_char, completions: *()) {
unsafe {
let cb = *local_data::local_data_get(complete_key)
.get();
do cb(str::raw::from_c_str(line)) |suggestion| {
do str::as_c_str(suggestion) |buf| {
rustrt::linenoiseAddCompletion(completions, buf);
}
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}
}
}
rustrt::linenoiseSetCompletionCallback(callback);
}