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// https://github.com/sharkdp/bat a1b9334a44a2c652f52dddaa83dbacba57372468
// src/output.rs
// See src/bat/LICENSE
use std::env;
use std::ffi::OsString;
use std::io::{self, Write};
use std::path::PathBuf;
use std::process::{Child, Command, Stdio};
use shell_words;
#[derive(Debug, Clone, Copy, PartialEq)]
#[allow(dead_code)]
pub enum PagingMode {
Always,
QuitIfOneScreen,
Never,
}
use crate::errors::*;
pub enum OutputType {
Pager(Child),
Stdout(io::Stdout),
}
impl OutputType {
pub fn from_mode(mode: PagingMode, pager: Option<&str>) -> Result<Self> {
use self::PagingMode::*;
Ok(match mode {
Always => OutputType::try_pager(false, pager)?,
QuitIfOneScreen => OutputType::try_pager(true, pager)?,
_ => OutputType::stdout(),
})
}
/// Try to launch the pager. Fall back to stdout in case of errors.
fn try_pager(quit_if_one_screen: bool, pager_from_config: Option<&str>) -> Result<Self> {
let mut replace_arguments_to_less = false;
let pager_from_env = match (env::var("BAT_PAGER"), env::var("PAGER")) {
(Ok(bat_pager), _) => Some(bat_pager),
(_, Ok(pager)) => {
// less needs to be called with the '-R' option in order to properly interpret the
// ANSI color sequences printed by bat. If someone has set PAGER="less -F", we
// therefore need to overwrite the arguments and add '-R'.
//
// We only do this for PAGER (as it is not specific to 'bat'), not for BAT_PAGER
// or bats '--pager' command line option.
replace_arguments_to_less = true;
Some(pager)
}
_ => None,
};
let pager_from_config = pager_from_config.map(|p| p.to_string());
if pager_from_config.is_some() {
replace_arguments_to_less = false;
}
let pager = pager_from_config
.or(pager_from_env)
.unwrap_or_else(|| String::from("less"));
let pagerflags =
shell_words::split(&pager).chain_err(|| "Could not parse pager command.")?;
match pagerflags.split_first() {
Some((pager_name, args)) => {
let mut pager_path = PathBuf::from(pager_name);
if pager_path.file_stem() == Some(&OsString::from("bat")) {
pager_path = PathBuf::from("less");
}
let is_less = pager_path.file_stem() == Some(&OsString::from("less"));
let mut process = if is_less {
let mut p = Command::new(&pager_path);
if args.is_empty() || replace_arguments_to_less {
p.args(vec!["--RAW-CONTROL-CHARS", "--no-init"]);
if quit_if_one_screen {
p.arg("--quit-if-one-screen");
}
} else {
p.args(args);
}
p.env("LESSCHARSET", "UTF-8");
p
} else {
let mut p = Command::new(&pager_path);
p.args(args);
p
};
Ok(process
.stdin(Stdio::piped())
.spawn()
.map(OutputType::Pager)
.unwrap_or_else(|_| OutputType::stdout()))
}
None => Ok(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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