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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.
use std::c_str::ToCStr;
use std::libc::{c_char, c_int};
use std::{local_data, str, rt};
use std::unstable::finally::Finally;
pub mod rustrt {
use std::libc::{c_char, c_int};
externfn!(fn linenoise(prompt: *c_char) -> *c_char)
externfn!(fn linenoiseHistoryAdd(line: *c_char) -> c_int)
externfn!(fn linenoiseHistorySetMaxLen(len: c_int) -> c_int)
externfn!(fn linenoiseHistorySave(file: *c_char) -> c_int)
externfn!(fn linenoiseHistoryLoad(file: *c_char) -> c_int)
externfn!(fn linenoiseSetCompletionCallback(callback: extern "C" fn(*i8, *())))
externfn!(fn linenoiseAddCompletion(completions: *(), line: *c_char))
externfn!(fn rust_take_linenoise_lock())
externfn!(fn rust_drop_linenoise_lock())
}
macro_rules! locked {
($expr:expr) => {
{
// FIXME #9105: can't use a static mutex in pure Rust yet.
rustrt::rust_take_linenoise_lock();
let x = $expr;
rustrt::rust_drop_linenoise_lock();
x
}
}
}
/// Add a line to history
pub fn add_history(line: &str) -> bool {
do line.with_c_str |buf| {
unsafe {
(locked!(rustrt::linenoiseHistoryAdd(buf))) == 1 as c_int
}
}
}
/// Set the maximum amount of lines stored
pub fn set_history_max_len(len: int) -> bool {
unsafe {
(locked!(rustrt::linenoiseHistorySetMaxLen(len as c_int))) == 1
as c_int
}
}
/// Save line history to a file
pub fn save_history(file: &str) -> bool {
do file.with_c_str |buf| {
// 0 on success, -1 on failure
unsafe {
(locked!(rustrt::linenoiseHistorySave(buf))) == 0 as c_int
}
}
}
/// Load line history from a file
pub fn load_history(file: &str) -> bool {
do file.with_c_str |buf| {
// 0 on success, -1 on failure
unsafe {
(locked!(rustrt::linenoiseHistoryLoad(buf))) == 0 as c_int
}
}
}
/// Print out a prompt and then wait for input and return it
pub fn read(prompt: &str) -> Option<~str> {
do prompt.with_c_str |buf| {
let line = unsafe {
locked!(rustrt::linenoise(buf))
};
if line.is_null() { None }
else {
unsafe {
do (|| {
Some(str::raw::from_c_str(line))
}).finally {
// linenoise's return value is from strdup, so we
// better not leak it.
rt::global_heap::exchange_free(line);
}
}
}
}
}
/// The callback used to perform completions.
pub trait CompletionCb {
/// Performs a completion.
fn complete(&self, line: ~str, suggestion: &fn(~str));
}
local_data_key!(complete_key: @CompletionCb)
/// Bind to the main completion callback in the current task.
///
/// The completion callback should not call any `extra::rl` functions
/// other than the closure that it receives as its second
/// argument. Calling such a function will deadlock on the mutex used
/// to ensure that the calls are thread-safe.
pub unsafe fn complete(cb: @CompletionCb) {
local_data::set(complete_key, cb);
extern fn callback(line: *c_char, completions: *()) {
do local_data::get(complete_key) |opt_cb| {
// only fetch completions if a completion handler has been
// registered in the current task.
match opt_cb {
None => {}
Some(cb) => {
unsafe {
do cb.complete(str::raw::from_c_str(line))
|suggestion| {
do suggestion.with_c_str |buf| {
rustrt::linenoiseAddCompletion(completions,
buf);
}
}
}
}
}
}
}
locked!(rustrt::linenoiseSetCompletionCallback(callback));
}
|
