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Code Issues Releases Wiki Activity

Also replace 'more' from PAGER with 'less'

Browse Source 
But first do some quite significant refactorings to keep the code clean
and easy to understand.
This commit is contained in:
Martin Nordholts
2020-12-30 13:25:23 +01:00
parent 22bdc7c20f
commit bfa5342331
3 changed files with 150 additions and 93 deletions
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2
CHANGELOG.md
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@@ -11,7 +11,7 @@
- Make ./tests/syntax-tests/regression_test.sh work on recent versions of macOS, see #1443 (@Enselic)
- VimL syntax highlighting fix, see #1450 (@esensar)
- Print an 'Invalid syntax theme settings' error message if a custom theme is broken, see #614 (@Enselic)
- If `PAGER=most` (but not `BAT_PAGER` or `--pager`), silently use `less` instead since `most` does not support colors, see #1063 (@Enselic)
- If `PAGER` (but not `BAT_PAGER` or `--pager`) is `more` or `most`, silently use `less` instead to ensure support for colors, see #1063 (@Enselic)
## Other

139
src/output.rs
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@@ -48,90 +48,71 @@ impl OutputType {
wrapping_mode: WrappingMode,
pager_from_config: Option<&str>,
) -> Result<Self> {
use std::ffi::OsString;
use std::path::PathBuf;
use crate::pager::{self, PagerKind, PagerSource};
use std::process::{Command, Stdio};
use crate::pager::*;
let Pager { pager, source } = get_pager(pager_from_config);
let pager_opt =
pager::get_pager(pager_from_config).chain_err(|| "Could not parse pager command.")?;
let pagerflags =
shell_words::split(&pager).chain_err(|| "Could not parse pager command.")?;
let pager = match pager_opt {
Some(pager) => pager,
None => return Ok(OutputType::stdout()),
};
match pagerflags.split_first() {
Some((pager_name, pager_args)) => {
let mut pager_path = PathBuf::from(pager_name);
let mut args = pager_args;
let empty_args = vec![];
if pager_path.file_stem() == Some(&OsString::from("bat")) {
return Err(ErrorKind::InvalidPagerValueBat.into());
}
if pager_path.file_stem() == Some(&OsString::from("most")) && source == PagerSource::PagerEnvVar {
pager_path = PathBuf::from("less");
args = &empty_args;
}
let is_less = pager_path.file_stem() == Some(&OsString::from("less"));
let mut process = if is_less {
// 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.
let replace_arguments_to_less = source == PagerSource::PagerEnvVar;
let mut p = Command::new(&pager_path);
if args.is_empty() || replace_arguments_to_less {
p.arg("--RAW-CONTROL-CHARS");
if single_screen_action == SingleScreenAction::Quit {
p.arg("--quit-if-one-screen");
}
if wrapping_mode == WrappingMode::NoWrapping {
p.arg("--chop-long-lines");
}
// Passing '--no-init' fixes a bug with '--quit-if-one-screen' in older
// versions of 'less'. Unfortunately, it also breaks mouse-wheel support.
//
// See: http://www.greenwoodsoftware.com/less/news.530.html
//
// For newer versions (530 or 558 on Windows), we omit '--no-init' as it
// is not needed anymore.
match retrieve_less_version() {
None => {
p.arg("--no-init");
}
Some(version)
if (version < 530 || (cfg!(windows) && version < 558)) =>
{
p.arg("--no-init");
}
_ => {}
}
} 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()),
if pager.kind == PagerKind::Bat {
return Err(ErrorKind::InvalidPagerValueBat.into());
}
let mut p = Command::new(pager.bin);
let args = pager.args;
if pager.kind == PagerKind::Less {
// 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.
let replace_arguments_to_less = pager.source == PagerSource::PagerEnvVar;
if args.is_empty() || replace_arguments_to_less {
p.arg("--RAW-CONTROL-CHARS");
if single_screen_action == SingleScreenAction::Quit {
p.arg("--quit-if-one-screen");
}
if wrapping_mode == WrappingMode::NoWrapping {
p.arg("--chop-long-lines");
}
// Passing '--no-init' fixes a bug with '--quit-if-one-screen' in older
// versions of 'less'. Unfortunately, it also breaks mouse-wheel support.
//
// See: http://www.greenwoodsoftware.com/less/news.530.html
//
// For newer versions (530 or 558 on Windows), we omit '--no-init' as it
// is not needed anymore.
match retrieve_less_version() {
None => {
p.arg("--no-init");
}
Some(version) if (version < 530 || (cfg!(windows) && version < 558)) => {
p.arg("--no-init");
}
_ => {}
}
} else {
p.args(args);
}
p.env("LESSCHARSET", "UTF-8");
} else {
p.args(args);
};
Ok(p.stdin(Stdio::piped())
.spawn()
.map(OutputType::Pager)
.unwrap_or_else(|_| OutputType::stdout()))
}
pub(crate) fn stdout() -> Self {

102
src/pager.rs
View File

@@ -1,3 +1,6 @@
use shell_words::ParseError;
use std::env;
/// If we use a pager, this enum tells us from where we were told to use it.
#[derive(Debug, PartialEq)]
pub enum PagerSource {
@@ -14,31 +17,104 @@ pub enum PagerSource {
Default,
}
/// We know about some pagers, for example 'less'. This is a list of all pagers we know about
#[derive(Debug, PartialEq)]
pub enum PagerKind {
/// The pager is ourselves
Bat,
/// less
Less,
/// more
More,
/// most
Most,
/// A pager we don't know about
Unknown,
}
impl PagerKind {
fn from_bin(bin: &str) -> PagerKind {
use std::ffi::OsStr;
use std::path::Path;
let stem = Path::new(bin)
.file_stem()
.unwrap_or_else(|| OsStr::new("unknown"));
if stem == OsStr::new("bat") {
PagerKind::Bat
} else if stem == OsStr::new("less") {
PagerKind::Less
} else if stem == OsStr::new("more") {
PagerKind::More
} else if stem == OsStr::new("most") {
PagerKind::Most
} else {
PagerKind::Unknown
}
}
}
/// A pager such as 'less', and from where we got it.
#[derive(Debug)]
pub struct Pager {
pub pager: String,
// The pager binary
pub bin: String,
// The pager binary arguments (that we might tweak)
pub args: Vec<String>,
// What pager this is
pub kind: PagerKind,
// From where this pager comes
pub source: PagerSource,
}
impl Pager {
fn new(pager: &str, source: PagerSource) -> Pager {
fn new(bin: &str, args: &[String], kind: PagerKind, source: PagerSource) -> Pager {
Pager {
pager: String::from(pager),
bin: String::from(bin),
args: args.to_vec(),
kind,
source,
}
}
}
/// Returns what pager to use, after looking at both config and environment variables.
pub fn get_pager(pager_from_config: Option<&str>) -> Pager {
match (
pager_from_config,
std::env::var("BAT_PAGER"),
std::env::var("PAGER"),
) {
(Some(config), _, _) => Pager::new(config, PagerSource::Config),
(_, Ok(bat_pager), _) => Pager::new(&bat_pager, PagerSource::BatPagerEnvVar),
(_, _, Ok(pager)) => Pager::new(&pager, PagerSource::PagerEnvVar),
_ => Pager::new("less", PagerSource::Default),
pub fn get_pager(config_pager: Option<&str>) -> Result<Option<Pager>, ParseError> {
let bat_pager = env::var("BAT_PAGER");
let pager = env::var("PAGER");
let (cmd, source) = match (config_pager, &bat_pager, &pager) {
(Some(config_pager), _, _) => (config_pager, PagerSource::Config),
(_, Ok(bat_pager), _) => (bat_pager.as_str(), PagerSource::BatPagerEnvVar),
(_, _, Ok(pager)) => (pager.as_str(), PagerSource::PagerEnvVar),
_ => ("less", PagerSource::Default),
};
let parts = shell_words::split(cmd)?;
match parts.split_first() {
Some((bin, args)) => {
let kind = PagerKind::from_bin(bin);
// 'more' and 'most' does not supports colors; automatically use 'less' instead
// if the problematic pager came from the generic PAGER env var
let no_color_support = kind == PagerKind::More || kind == PagerKind::Most;
let use_less_instead = no_color_support && source == PagerSource::PagerEnvVar;
Ok(Some(if use_less_instead {
let no_args = vec![];
Pager::new("less", &no_args, PagerKind::Less, PagerSource::PagerEnvVar)
} else {
Pager::new(bin, args, kind, source)
}))
}
None => Ok(None),
}
}