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|
use ansi_term::Style;
use crate::fs::File;
use crate::options::{flags, Vars, Misfire};
use crate::options::parser::MatchedFlags;
use crate::output::file_name::{FileStyle, Classify};
use crate::style::Colours;
/// Under what circumstances we should display coloured, rather than plain,
/// output to the terminal.
///
/// By default, we want to display the colours when stdout can display them.
/// Turning them on when output is going to, say, a pipe, would make programs
/// such as `grep` or `more` not work properly. So the `Automatic` mode does
/// this check and only displays colours when they can be truly appreciated.
#[derive(PartialEq, Debug)]
enum TerminalColours {
/// Display them even when output isn’t going to a terminal.
Always,
/// Display them when output is going to a terminal, but not otherwise.
Automatic,
/// Never display them, even when output is going to a terminal.
Never,
}
impl Default for TerminalColours {
fn default() -> Self {
Self::Automatic
}
}
impl TerminalColours {
/// Determine which terminal colour conditions to use.
fn deduce(matches: &MatchedFlags) -> Result<Self, Misfire> {
let word = match matches.get_where(|f| f.matches(&flags::COLOR) || f.matches(&flags::COLOUR))? {
Some(w) => w,
None => return Ok(Self::default()),
};
if word == "always" {
Ok(Self::Always)
}
else if word == "auto" || word == "automatic" {
Ok(Self::Automatic)
}
else if word == "never" {
Ok(Self::Never)
}
else {
Err(Misfire::BadArgument(&flags::COLOR, word.into()))
}
}
}
/// **Styles**, which is already an overloaded term, is a pair of view option
/// sets that happen to both be affected by `LS_COLORS` and `EXA_COLORS`.
/// Because it’s better to only iterate through that once, the two are deduced
/// together.
pub struct Styles {
/// The colours to paint user interface elements, like the date column,
/// and file kinds, such as directories.
pub colours: Colours,
/// The colours to paint the names of files that match glob patterns
/// (and the classify option).
pub style: FileStyle,
}
impl Styles {
#[allow(trivial_casts)] // the "as Box<_>" stuff below warns about this for some reason
pub fn deduce<V, TW>(matches: &MatchedFlags, vars: &V, widther: TW) -> Result<Self, Misfire>
where TW: Fn() -> Option<usize>, V: Vars {
use self::TerminalColours::*;
use crate::info::filetype::FileExtensions;
use crate::output::file_name::NoFileColours;
let classify = Classify::deduce(matches)?;
// Before we do anything else, figure out if we need to consider
// custom colours at all
let tc = TerminalColours::deduce(matches)?;
if tc == Never || (tc == Automatic && widther().is_none()) {
return Ok(Self {
colours: Colours::plain(),
style: FileStyle { classify, exts: Box::new(NoFileColours) },
});
}
// Parse the environment variables into colours and extension mappings
let scale = matches.has_where(|f| f.matches(&flags::COLOR_SCALE) || f.matches(&flags::COLOUR_SCALE))?;
let mut colours = Colours::colourful(scale.is_some());
let (exts, use_default_filetypes) = parse_color_vars(vars, &mut colours);
// Use between 0 and 2 file name highlighters
let exts = match (exts.is_non_empty(), use_default_filetypes) {
(false, false) => Box::new(NoFileColours) as Box<_>,
(false, true) => Box::new(FileExtensions) as Box<_>,
( true, false) => Box::new(exts) as Box<_>,
( true, true) => Box::new((exts, FileExtensions)) as Box<_>,
};
let style = FileStyle { classify, exts };
Ok(Self { colours, style })
}
}
/// Parse the environment variables into LS_COLORS pairs, putting file glob
/// colours into the `ExtensionMappings` that gets returned, and using the
/// two-character UI codes to modify the mutable `Colours`.
///
/// Also returns if the EXA_COLORS variable should reset the existing file
/// type mappings or not. The `reset` code needs to be the first one.
fn parse_color_vars<V: Vars>(vars: &V, colours: &mut Colours) -> (ExtensionMappings, bool) {
use log::*;
use crate::options::vars;
use crate::style::LSColors;
let mut exts = ExtensionMappings::default();
if let Some(lsc) = vars.get(vars::LS_COLORS) {
let lsc = lsc.to_string_lossy();
LSColors(lsc.as_ref()).each_pair(|pair| {
if !colours.set_ls(&pair) {
match glob::Pattern::new(pair.key) {
Ok(pat) => exts.add(pat, pair.to_style()),
Err(e) => warn!("Couldn't parse glob pattern {:?}: {}", pair.key, e),
}
}
});
}
let mut use_default_filetypes = true;
if let Some(exa) = vars.get(vars::EXA_COLORS) {
let exa = exa.to_string_lossy();
// Is this hacky? Yes.
if exa == "reset" || exa.starts_with("reset:") {
use_default_filetypes = false;
}
LSColors(exa.as_ref()).each_pair(|pair| {
if !colours.set_ls(&pair) && !colours.set_exa(&pair) {
match glob::Pattern::new(pair.key) {
Ok(pat) => exts.add(pat, pair.to_style()),
Err(e) => warn!("Couldn't parse glob pattern {:?}: {}", pair.key, e),
}
};
});
}
(exts, use_default_filetypes)
}
#[derive(PartialEq, Debug, Default)]
struct ExtensionMappings {
mappings: Vec<(glob::Pattern, Style)>
}
// Loop through backwards so that colours specified later in the list override
// colours specified earlier, like we do with options and strict mode
use crate::output::file_name::FileColours;
impl FileColours for ExtensionMappings {
fn colour_file(&self, file: &File) -> Option<Style> {
self.mappings
.iter()
.rev()
.find(|t| t.0.matches(&file.name))
.map (|t| t.1)
}
}
impl ExtensionMappings {
fn is_non_empty(&self) -> bool {
!self.mappings.is_empty()
}
fn add(&mut self, pattern: glob::Pattern, style: Style) {
self.mappings.push((pattern, style))
}
}
impl Classify {
fn deduce(matches: &MatchedFlags) -> Result<Self, Misfire> {
let flagged = matches.has(&flags::CLASSIFY)?;
Ok(if flagged { Self::AddFileIndicators }
else { Self::JustFilenames })
}
}
#[cfg(test)]
mod terminal_test {
use super::*;
use std::ffi::OsString;
use crate::options::flags;
use crate::options::parser::{Flag, Arg};
use crate::options::test::parse_for_test;
use crate::options
|