path: root/src/bin/bat/main.rs

#![deny(unsafe_code)]

mod app;
mod assets;
mod clap_app;
mod config;
mod directories;
mod input;

use std::collections::{HashMap, HashSet};
use std::fmt::Write as _;
use std::io;
use std::io::{BufReader, Write};
use std::path::Path;
use std::process;

use nu_ansi_term::Color::Green;
use nu_ansi_term::Style;

use crate::{
    app::App,
    config::{config_file, generate_config_file},
};

#[cfg(feature = "bugreport")]
use crate::config::system_config_file;

use assets::{assets_from_cache_or_binary, clear_assets};
use directories::PROJECT_DIRS;
use globset::GlobMatcher;

use bat::{
    assets::HighlightingAssets,
    config::Config,
    controller::Controller,
    error::*,
    input::Input,
    style::{StyleComponent, StyleComponents},
    MappingTarget, PagingMode,
};

const THEME_PREVIEW_DATA: &[u8] = include_bytes!("../../../assets/theme_preview.rs");

#[cfg(feature = "build-assets")]
fn build_assets(matches: &clap::ArgMatches, config_dir: &Path, cache_dir: &Path) -> Result<()> {
    let source_dir = matches
        .get_one::<String>("source")
        .map(Path::new)
        .unwrap_or_else(|| config_dir);

    bat::assets::build(
        source_dir,
        !matches.get_flag("blank"),
        matches.get_flag("acknowledgements"),
        cache_dir,
        clap::crate_version!(),
    )
}

fn run_cache_subcommand(
    matches: &clap::ArgMatches,
    #[cfg(feature = "build-assets")] config_dir: &Path,
    default_cache_dir: &Path,
) -> Result<()> {
    let cache_dir = matches
        .get_one::<String>("target")
        .map(Path::new)
        .unwrap_or_else(|| default_cache_dir);

    if matches.get_flag("build") {
        #[cfg(feature = "build-assets")]
        build_assets(matches, config_dir, cache_dir)?;
        #[cfg(not(feature = "build-assets"))]
        println!("bat has been built without the 'build-assets' feature. The 'cache --build' option is not available.");
    } else if matches.get_flag("clear") {
        clear_assets(cache_dir);
    }

    Ok(())
}

fn get_syntax_mapping_to_paths<'r, 't, I>(mappings: I) -> HashMap<&'t str, Vec<String>>
where
    I: IntoIterator<Item = (&'r GlobMatcher, &'r MappingTarget<'t>)>,
    't: 'r, // target text outlives rule
{
    let mut map = HashMap::new();
    for mapping in mappings {
        if let (matcher, MappingTarget::MapTo(s)) = mapping {
            let globs = map.entry(*s).or_insert_with(Vec::new);
            globs.push(matcher.glob().glob().into());
        }
    }
    map
}

pub fn get_languages(config: &Config, cache_dir: &Path) -> Result<String> {
    let mut result: String = String::new();

    let assets = assets_from_cache_or_binary(config.use_custom_assets, cache_dir)?;
    let mut languages = assets
        .get_syntaxes()?
        .iter()
        .filter(|syntax| !syntax.hidden && !syntax.file_extensions.is_empty())
        .cloned()
        .collect::<Vec<_>>();

    // Handling of file-extension conflicts, see issue #1076
    for lang in &mut languages {
        let lang_name = lang.name.clone();
        lang.file_extensions.retain(|extension| {
            // The 'extension' variable is not certainly a real extension.
            //
            // Skip if 'extension' starts with '.', likely a hidden file like '.vimrc'
            // Also skip if the 'extension' contains another real extension, likely
            // that is a full match file name like 'CMakeLists.txt' and 'Cargo.lock'
            if extension.starts_with('.') || Path::new(extension).extension().is_some() {
                return true;
            }

            let test_file = Path::new("test").with_extension(extension);
            let syntax_in_set = assets.get_syntax_for_path(test_file, &config.syntax_mapping);
            matches!(syntax_in_set, Ok(syntax_in_set) if syntax_in_set.syntax.name == lang_name)
        });
    }

    languages.sort_by_key(|lang| lang.name.to_uppercase());

    let configured_languages = get_syntax_mapping_to_paths(config.syntax_mapping.all_mappings());

    for lang in &mut languages {
        if let Some(additional_paths) = configured_languages.get(lang.name.as_str()) {
            lang.file_extensions
                .extend(additional_paths.iter().cloned());
        }
    }

    if config.loop_through {
        for lang in languages {
            writeln!(result, "{}:{}", lang.name, lang.file_extensions.join(",")).ok();
        }
    } else {
        let longest = languages
            .iter()
            .map(|syntax| syntax.name.len())
            .max()
            .unwrap_or(32); // Fallback width if they have no language definitions.

        let comma_separator = ", ";
        let separator = " ";
        // Line-wrapping for the possible file extension overflow.
        let desired_width = config.term_width - longest - separator.len();

        let style = if config.colored_output {
            Green.normal()
        } else {
            Style::default()
        };

        for lang in languages {
            write!(result, "{:width$}{}", lang.name, separator, width = longest).ok();

            // Number of characters on this line so far, wrap before `desired_width`
            let mut num_chars = 0;

            let mut extension = lang.file_extensions.iter().peekable();
            while let Some(word) = extension.next() {
                // If we can't fit this word in, then create a line break and align it in.
                let new_chars = word.len() + comma_separator.len();
                if num_chars + new_chars >= desired_width {
                    num_chars = 0;
                    write!(result, "\n{:width$}{}", "", separator, width = longest).ok();
                }

                num_chars += new_chars;
                write!(result, "{}", style.paint(&word[..])).ok();
                if extension.peek().is_some() {
                    result += comma_separator;
                }
            }
            result += "\n";
        }
    }

    Ok(result)
}

fn theme_preview_file<'a>() -> Input<'a> {
    Input::from_reader(Box::new(BufReader::new(THEME_PREVIEW_DATA)))
}

pub fn list_themes(cfg: &Config, config_dir: &Path, cache_dir: &Path) -> Result<()> {
    let assets = assets_from_cache_or_binary(cfg.use_custom_assets, cache_dir)?;
    let mut config = cfg.clone();
    let mut style = HashSet::new();
    style.insert(StyleComponent::Plain);
    config.language = Some("Rust");
    config.style_components = StyleComponents(style);

    let stdout = io::stdout();
    let mut stdout = stdout.lock();

    if config.colored_output {
        let default_theme = HighlightingAssets::default_theme();
        for theme in assets.themes() {
            let default_theme_info = if default_theme == theme {
                " (default)"
            } else {
                ""
            };
            writeln!(
                stdout,
                "Theme: {}{}\n",
                Style::new().bold().paint(theme.to_string()),
                default_theme_info
            )?;
            config.theme = theme.to_string();
            Controller::new(&config, &assets)
                .