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extern crate libc;
extern crate nix;
mod error;
mod buffer;
mod history;
mod parser;
mod instr;
mod term;
use std::os::unix::io::{RawFd, AsRawFd};
pub use error::Error;
use history::History;
use buffer::Buffer;
use term::{Term, RawMode};
fn readline_edit(term: &mut Term, raw: &mut RawMode, history: &History, prompt: &str) -> Result<String, Error> {
let mut buffer = Buffer::new();
let mut seq: Vec<u8> = Vec::new();
let mut history_cursor = history::Cursor::new(history);
loop {
try!(raw.write(&buffer.get_line(prompt)));
let byte = try!(try!(term.read_byte()).ok_or(Error::EndOfFile));
seq.push(byte);
match parser::parse(&seq) {
parser::Result::Error => return Err(Error::InvalidUTF8),
parser::Result::Incomplete => continue,
parser::Result::Success(token) => {
match instr::interpret_token(token) {
instr::Instr::Done => {
return buffer.to_string();
},
instr::Instr::DeleteCharLeftOfCursor => {
buffer.delete_byte_left_of_cursor();
},
instr::Instr::DeleteCharRightOfCursor => {
buffer.delete_byte_right_of_cursor();
},
instr::Instr::DeleteCharRightOfCursorOrEOF => {
if !buffer.delete_byte_right_of_cursor() {
return Err(Error::EndOfFile);
}
},
instr::Instr::MoveCursorLeft => buffer.move_left(),
instr::Instr::MoveCursorRight => buffer.move_right(),
instr::Instr::MoveCursorStart => buffer.move_start(),
instr::Instr::MoveCursorEnd => buffer.move_end(),
instr::Instr::HistoryPrev => {
if history_cursor.incr() {
buffer.swap()
}
history_cursor.get().map(|s| buffer.replace(s.as_bytes()));
},
instr::Instr::HistoryNext => {
if history_cursor.decr() {
buffer.swap()
}
history_cursor.get().map(|s| buffer.replace(s.as_bytes()));
},
instr::Instr::Noop => (),
instr::Instr::Cancel => return Err(Error::EndOfFile),
instr::Instr::Clear => try!(raw.clear()),
instr::Instr::InsertAtCursor => buffer.insert_bytes_at_cursor(&seq)
};
seq.clear();
}
};
}
}
pub struct Copperline {
term: Term,
history: History
}
impl Copperline {
pub fn new() -> Copperline {
Copperline::new_from_raw_fds(libc::STDIN_FILENO, libc::STDOUT_FILENO)
}
pub fn new_from_io<I: AsRawFd, O: AsRawFd>(i: &I, o: &O) -> Copperline {
Copperline::new_from_raw_fds(i.as_raw_fd(), o.as_raw_fd())
}
pub fn new_from_raw_fds(ifd: RawFd, ofd: RawFd) -> Copperline {
Copperline {
term: Term::new(ifd, ofd),
history: History::new()
}
}
pub fn read_line(&mut self, prompt: &str) -> Result<String, Error> {
if Term::is_unsupported_term() || !self.term.is_a_tty() {
return Err(Error::UnsupportedTerm);
}
let result = self.term.acquire_raw_mode().and_then(|mut raw| {
readline_edit(&mut self.term, &mut raw, &self.history, prompt)
});
println!("");
result
}
pub fn get_current_history_length(&self) -> usize {
self.history.len()
}
pub fn add_history(&mut self, line: String) {
self.history.push(line)
}
pub fn get_history_item(&self, idx: usize) -> Option<&String> {
self.history.get(idx)
}
pub fn remove_history_item(&mut self, idx: usize) -> Option<String> {
self.history.remove(idx)
}
pub fn clear_history(&mut self) {
self.history.clear()
}
pub fn clear_screen(&mut self) -> Result<(), Error> {
let mut raw = try!(self.term.acquire_raw_mode());
raw.clear().map_err(Error::ErrNo)
}
}