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extern crate libc;
use std::ffi::OsString;
mod helper;
use helper::{fork, close, dup2, execvp, pipe, find_pager};
const DEFAULT_PAGER_ENV: &'static str = "PAGER";
#[derive(Debug, Default)]
pub struct Pager {
pager: Option<OsString>,
env: String,
ok: bool,
}
impl Pager {
pub fn new() -> Self {
let pager = find_pager(DEFAULT_PAGER_ENV);
Pager {
pager: pager,
env: DEFAULT_PAGER_ENV.into(),
ok: true,
}
}
pub fn env(env: &str) -> Self {
let pager = find_pager(env);
Pager {
pager: pager,
env: env.into(),
ok: true,
}
}
pub fn ok(&self) -> bool {
self.ok
}
pub fn setup(&mut self) {
if let Some(ref pager) = self.pager {
let (pager_stdin, main_stdout) = pipe();
let pid = fork();
match pid {
-1 => {
close(pager_stdin);
close(main_stdout);
self.ok = false
}
0 => {
dup2(main_stdout, libc::STDOUT_FILENO);
close(pager_stdin);
}
_ => {
dup2(pager_stdin, libc::STDIN_FILENO);
close(main_stdout);
execvp(vec![pager]);
}
}
}
}
}