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use app::PagingMode;
use errors::*;
use std::io::{self, Write};
use std::process::{Child, Command, Stdio};
pub enum OutputType {
Pager(Child),
Stdout(io::Stdout),
}
impl OutputType {
pub fn from_mode(mode: PagingMode) -> Self {
use self::PagingMode::*;
match mode {
Always => OutputType::try_pager(false),
QuitIfOneScreen => OutputType::try_pager(true),
_ => OutputType::stdout(),
}
}
/// Try to launch the pager. Fall back to stdout in case of errors.
fn try_pager(quit_if_one_screen: bool) -> Self {
let mut args = vec!["--RAW-CONTROL-CHARS", "--no-init"];
if quit_if_one_screen {
args.push("--quit-if-one-screen");
}
Command::new("less")
.args(&args)
.env("LESSCHARSET", "UTF-8")
.stdin(Stdio::piped())
.spawn()
.map(OutputType::Pager)
.unwrap_or_else(|_| OutputType::stdout())
}
fn stdout() -> Self {
OutputType::Stdout(io::stdout())
}
pub fn handle(&mut self) -> Result<&mut Write> {
Ok(match *self {
OutputType::Pager(ref mut command) => command
.stdin
.as_mut()
.chain_err(|| "Could not open stdin for pager")?,
OutputType::Stdout(ref mut handle) => handle,
})
}
}
impl Drop for OutputType {
fn drop(&mut self) {
if let OutputType::Pager(ref mut command) = *self {
let _ = command.wait();
}
}
}
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