Move src/bin/* into src/bin/bat/

This will limit [[bin]] to *bat* only which will make:
- `cargo run` works without specifying --bin
- prevent `cargo build --bins` to produce multiple binaries (app,clap_app,...)

src/bin/bat/app.rs

@@ -0,0 +1,335 @@
+use std::collections::HashSet;
+use std::env;
+use std::str::FromStr;
+
+use atty::{self, Stream};
+
+use crate::clap_app;
+use clap::ArgMatches;
+use wild;
+
+use console::Term;
+
+#[cfg(windows)]
+use ansi_term;
+
+use crate::assets::BAT_THEME_DEFAULT;
+use crate::config::{get_args_from_config_file, get_args_from_env_var};
+use crate::errors::*;
+use crate::inputfile::InputFile;
+use crate::line_range::{LineRange, LineRanges};
+use crate::style::{OutputComponent, OutputComponents, OutputWrap};
+use crate::syntax_mapping::SyntaxMapping;
+use crate::util::transpose;
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum PagingMode {
+    Always,
+    QuitIfOneScreen,
+    Never,
+}
+
+#[derive(Clone)]
+pub struct Config<'a> {
+    /// List of files to print
+    pub files: Vec<InputFile<'a>>,
+
+    /// The explicitly configured language, if any
+    pub language: Option<&'a str>,
+
+    /// Whether or not to show/replace non-printable characters like space, tab and newline.
+    pub show_nonprintable: bool,
+
+    /// The character width of the terminal
+    pub term_width: usize,
+
+    /// The width of tab characters.
+    /// Currently, a value of 0 will cause tabs to be passed through without expanding them.
+    pub tab_width: usize,
+
+    /// Whether or not to simply loop through all input (`cat` mode)
+    pub loop_through: bool,
+
+    /// Whether or not the output should be colorized
+    pub colored_output: bool,
+
+    /// Whether or not the output terminal supports true color
+    pub true_color: bool,
+
+    /// Style elements (grid, line numbers, ...)
+    pub output_components: OutputComponents,
+
+    /// Text wrapping mode
+    pub output_wrap: OutputWrap,
+
+    /// Pager or STDOUT
+    pub paging_mode: PagingMode,
+
+    /// Specifies the lines that should be printed
+    pub line_ranges: LineRanges,
+
+    /// The syntax highlighting theme
+    pub theme: String,
+
+    /// File extension/name mappings
+    pub syntax_mapping: SyntaxMapping,
+
+    /// Command to start the pager
+    pub pager: Option<&'a str>,
+
+    /// Whether or not to use ANSI italics
+    pub use_italic_text: bool,
+
+    /// Lines to highlight
+    pub highlight_lines: Vec<usize>,
+}
+
+fn is_truecolor_terminal() -> bool {
+    env::var("COLORTERM")
+        .map(|colorterm| colorterm == "truecolor" || colorterm == "24bit")
+        .unwrap_or(false)
+}
+
+pub struct App {
+    pub matches: ArgMatches<'static>,
+    interactive_output: bool,
+}
+
+impl App {
+    pub fn new() -> Result<Self> {
+        #[cfg(windows)]
+        let _ = ansi_term::enable_ansi_support();
+
+        let interactive_output = atty::is(Stream::Stdout);
+
+        Ok(App {
+            matches: Self::matches(interactive_output)?,
+            interactive_output,
+        })
+    }
+
+    fn matches(interactive_output: bool) -> Result<ArgMatches<'static>> {
+        let args = if wild::args_os().nth(1) == Some("cache".into())
+            || wild::args_os().any(|arg| arg == "--no-config")
+        {
+            // Skip the arguments in bats config file
+
+            wild::args_os().collect::<Vec<_>>()
+        } else {
+            let mut cli_args = wild::args_os();
+
+            // Read arguments from bats config file
+            let mut args = get_args_from_env_var()
+                .unwrap_or_else(get_args_from_config_file)
+                .chain_err(|| "Could not parse configuration file")?;
+
+            // Put the zero-th CLI argument (program name) first
+            args.insert(0, cli_args.next().unwrap());
+
+            // .. and the rest at the end
+            cli_args.for_each(|a| args.push(a));
+
+            args
+        };
+
+        Ok(clap_app::build_app(interactive_output).get_matches_from(args))
+    }
+
+    pub fn config(&self) -> Result<Config> {
+        let files = self.files();
+        let output_components = self.output_components()?;
+
+        let paging_mode = match self.matches.value_of("paging") {
+            Some("always") => PagingMode::Always,
+            Some("never") => PagingMode::Never,
+            Some("auto") | _ => {
+                if self.matches.occurrences_of("plain") > 1 {
+                    // If we have -pp as an option when in auto mode, the pager should be disabled.
+                    PagingMode::Never
+                } else if files.contains(&InputFile::StdIn) {
+                    // If we are reading from stdin, only enable paging if we write to an
+                    // interactive terminal and if we do not *read* from an interactive
+                    // terminal.
+                    if self.interactive_output && !atty::is(Stream::Stdin) {
+                        PagingMode::QuitIfOneScreen
+                    } else {
+                        PagingMode::Never
+                    }
+                } else if self.interactive_output {
+                    PagingMode::QuitIfOneScreen
+                } else {
+                    PagingMode::Never
+                }
+            }
+        };
+
+        let mut syntax_mapping = SyntaxMapping::new();
+
+        if let Some(values) = self.matches.values_of("map-syntax") {
+            for from_to in values {
+                let parts: Vec<_> = from_to.split(':').collect();
+
+                if parts.len() != 2 {
+                    return Err("Invalid syntax mapping. The format of the -m/--map-syntax option is 'from:to'.".into());
+                }
+
+                syntax_mapping.insert(parts[0], parts[1]);
+            }
+        }
+
+        Ok(Config {
+            true_color: is_truecolor_terminal(),
+            language: self.matches.value_of("language").or_else(|| {
+                if self.matches.is_present("show-all") {
+                    Some("show-nonprintable")
+                } else {
+                    None
+                }
+            }),
+            show_nonprintable: self.matches.is_present("show-all"),
+            output_wrap: if !self.interactive_output {
+                // We don't have the tty width when piping to another program.
+                // There's no point in wrapping when this is the case.
+                OutputWrap::None
+            } else {
+                match self.matches.value_of("wrap") {
+                    Some("character") => OutputWrap::Character,
+                    Some("never") => OutputWrap::None,
+                    Some("auto") | _ => {
+                        if output_components.plain() {
+                            OutputWrap::None
+                        } else {
+                            OutputWrap::Character
+                        }
+                    }
+                }
+            },
+            colored_output: match self.matches.value_of("color") {
+                Some("always") => true,
+                Some("never") => false,
+                Some("auto") | _ => self.interactive_output,
+            },
+            paging_mode,
+            term_width: self
+                .matches
+                .value_of("terminal-width")
+                .and_then(|w| {
+                    if w.starts_with('+') || w.starts_with('-') {
+                        // Treat argument as a delta to the current terminal width
+                        w.parse().ok().map(|delta: i16| {
+                            let old_width: u16 = Term::stdout().size().1;
+                            let new_width: i32 = i32::from(old_width) + i32::from(delta);
+
+                            if new_width <= 0 {
+                                old_width as usize
+                            } else {
+                                new_width as usize
+                            }
+                        })
+                    } else {
+                        w.parse().ok()
+                    }
+                })
+                .unwrap_or(Term::stdout().size().1 as usize),
+            loop_through: !(self.interactive_output
+                || self.matches.value_of("color") == Some("always")
+                || self.matches.value_of("decorations") == Some("always")),
+            files,
+            tab_width: self
+                .matches
+                .value_of("tabs")
+                .map(String::from)
+                .or_else(|| env::var("BAT_TABS").ok())
+                .and_then(|t| t.parse().ok())
+                .unwrap_or(
+                    if output_components.plain() && paging_mode == PagingMode::Never {
+                        0
+                    } else {
+                        4
+                    },
+                ),
+            theme: self
+                .matches
+                .value_of("theme")
+                .map(String::from)
+                .or_else(|| env::var("BAT_THEME").ok())
+                .unwrap_or_else(|| String::from(BAT_THEME_DEFAULT)),
+            line_ranges: LineRanges::from(
+                transpose(
+                    self.matches
+                        .values_of("line-range")
+                        .map(|vs| vs.map(LineRange::from).collect()),
+                )?
+                .unwrap_or_else(|| vec![]),
+            ),
+            output_components,
+            syntax_mapping,
+            pager: self.matches.value_of("pager"),
+            use_italic_text: match self.matches.value_of("italic-text") {
+                Some("always") => true,
+                _ => false,
+            },
+            highlight_lines: self
+                .matches
+                .values_of("highlight-line")
+                .and_then(|ws| ws.map(|w| w.parse().ok()).collect())
+                .unwrap_or_default(),
+        })
+    }
+
+    fn files(&self) -> Vec<InputFile> {
+        self.matches
+            .values_of("FILE")
+            .map(|values| {
+                values
+                    .map(|filename| {
+                        if filename == "-" {
+                            InputFile::StdIn
+                        } else {
+                            InputFile::Ordinary(filename)
+                        }
+                    })
+                    .collect()
+            })
+            .unwrap_or_else(|| vec![InputFile::StdIn])
+    }
+
+    fn output_components(&self) -> Result<OutputComponents> {
+        let matches = &self.matches;
+        Ok(OutputComponents(
+            if matches.value_of("decorations") == Some("never") {
+                HashSet::new()
+            } else if matches.is_present("number") {
+                [OutputComponent::Numbers].iter().cloned().collect()
+            } else if matches.is_present("plain") {
+                [OutputComponent::Plain].iter().cloned().collect()
+            } else {
+                let env_style_components: Option<Vec<OutputComponent>> =
+                    transpose(env::var("BAT_STYLE").ok().map(|style_str| {
+                        style_str
+                            .split(',')
+                            .map(|x| OutputComponent::from_str(&x))
+                            .collect::<Result<Vec<OutputComponent>>>()
+                    }))?;
+
+                matches
+                    .value_of("style")
+                    .map(|styles| {
+                        styles
+                            .split(',')
+                            .map(|style| style.parse::<OutputComponent>())
+                            .filter_map(|style| style.ok())
+                            .collect::<Vec<_>>()
+                    })
+                    .or(env_style_components)
+                    .unwrap_or_else(|| vec![OutputComponent::Full])
+                    .into_iter()
+                    .map(|style| style.components(self.interactive_output))
+                    .fold(HashSet::new(), |mut acc, components| {
+                        acc.extend(components.iter().cloned());
+                        acc
+                    })
+            },
+        ))
+    }
+}

src/bin/bat/clap_app.rs

@@ -0,0 +1,440 @@
+use clap::{App as ClapApp, AppSettings, Arg, ArgGroup, SubCommand};
+use std::path::Path;
+
+pub fn build_app(interactive_output: bool) -> ClapApp<'static, 'static> {
+    let clap_color_setting = if interactive_output {
+        AppSettings::ColoredHelp
+    } else {
+        AppSettings::ColorNever
+    };
+
+    let app = ClapApp::new(crate_name!())
+        .version(crate_version!())
+        .global_setting(clap_color_setting)
+        .global_setting(AppSettings::DeriveDisplayOrder)
+        .global_setting(AppSettings::UnifiedHelpMessage)
+        .global_setting(AppSettings::HidePossibleValuesInHelp)
+        .setting(AppSettings::ArgsNegateSubcommands)
+        .setting(AppSettings::AllowExternalSubcommands)
+        .setting(AppSettings::DisableHelpSubcommand)
+        .setting(AppSettings::VersionlessSubcommands)
+        .max_term_width(100)
+        .about(
+            "A cat(1) clone with wings.\n\n\
+             Use '--help' instead of '-h' to see a more detailed version of the help text.",
+        )
+        .long_about("A cat(1) clone with syntax highlighting and Git integration.")
+        .arg(
+            Arg::with_name("FILE")
+                .help("File(s) to print / concatenate. Use '-' for standard input.")
+                .long_help(
+                    "File(s) to print / concatenate. Use a dash ('-') or no argument at all \
+                     to read from standard input.",
+                )
+                .multiple(true)
+                .empty_values(false),
+        )
+        .arg(
+            Arg::with_name("language")
+                .short("l")
+                .long("language")
+                .overrides_with("language")
+                .help("Set the language for syntax highlighting.")
+                .long_help(
+                    "Explicitly set the language for syntax highlighting. The language can be \
+                     specified as a name (like 'C++' or 'LaTeX') or possible file extension \
+                     (like 'cpp', 'hpp' or 'md'). Use '--list-languages' to show all supported \
+                     language names and file extensions.",
+                )
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("list-languages")
+                .long("list-languages")
+                .short("L")
+                .conflicts_with("list-themes")
+                .help("Display all supported languages.")
+                .long_help("Display a list of supported languages for syntax highlighting."),
+        )
+        .arg(
+            Arg::with_name("map-syntax")
+                .short("m")
+                .long("map-syntax")
+                .multiple(true)
+                .takes_value(true)
+                .number_of_values(1)
+                .value_name("from:to")
+                .help("Map a file extension or name to an existing syntax.")
+                .long_help(
+                    "Map a file extension or file name to an existing syntax. For example, \
+                     to highlight *.conf files with the INI syntax, use '-m conf:ini'. \
+                     To highlight files named '.myignore' with the Git Ignore syntax, use \
+                     '-m .myignore:gitignore'.",
+                )
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("theme")
+                .long("theme")
+                .overrides_with("theme")
+                .takes_value(true)
+                .help("Set the color theme for syntax highlighting.")
+                .long_help(
+                    "Set the theme for syntax highlighting. Use '--list-themes' to \
+                     see all available themes. To set a default theme, add the \
+                     '--theme=\"...\"' option to the configuration file or export the \
+                     BAT_THEME environment variable (e.g.: export \
+                     BAT_THEME=\"...\").",
+                ),
+        )
+        .arg(
+            Arg::with_name("list-themes")
+                .long("list-themes")
+                .help("Display all supported highlighting themes.")
+                .long_help("Display a list of supported themes for syntax highlighting."),
+        )
+        .arg(
+            Arg::with_name("style")
+                .long("style")
+                .value_name("style-components")
+                // Need to turn this off for overrides_with to work as we want. See the bottom most
+                // example at https://docs.rs/clap/2.32.0/clap/struct.Arg.html#method.overrides_with
+                .use_delimiter(false)
+                .takes_value(true)
+                .overrides_with("style")
+                .overrides_with("plain")
+                .overrides_with("number")
+                // Cannot use clap's built in validation because we have to turn off clap's delimiters
+                .validator(|val| {
+                    let mut invalid_vals = val.split(',').filter(|style| {
+                        !&[
+                            "auto", "full", "plain", "changes", "header", "grid", "numbers", "snip"
+                        ]
+                        .contains(style)
+                    });
+
+                    if let Some(invalid) = invalid_vals.next() {
+                        Err(format!("Unknown style, '{}'", invalid))
+                    } else {
+                        Ok(())
+                    }
+                })
+                .help(
+                    "Comma-separated list of style elements to display \
+                     (*auto*, full, plain, changes, header, grid, numbers, snip).",
+                )
+                .long_help(
+                    "Configure which elements (line numbers, file headers, grid \
+                     borders, Git modifications, ..) to display in addition to the \
+                     file contents. The argument is a comma-separated list of \
+                     components to display (e.g. 'numbers,changes,grid') or a \
+                     pre-defined style ('full'). To set a default style, add the \
+                     '--style=\"..\"' option to the configuration file or export the \
+                     BAT_STYLE environment variable (e.g.: export BAT_STYLE=\"..\"). \
+                     Possible values: *auto*, full, plain, changes, header, grid, numbers, snip.",
+                ),
+        )
+        .arg(
+            Arg::with_name("plain")
+                .overrides_with("plain")
+                .overrides_with("number")
+                .short("p")
+                .long("plain")
+                .multiple(true)
+                .help("Show plain style (alias for '--style=plain').")
+                .long_help(
+                    "Only show plain style, no decorations. This is an alias for \
+                     '--style=plain'. When '-p' is used twice ('-pp'), it also disables \
+                     automatic paging (alias for '--style=plain --pager=never').",
+                ),
+        )
+        .arg(
+            Arg::with_name("number")
+                .long("number")
+                .overrides_with("number")
+                .short("n")
+                .help("Show line numbers (alias for '--style=numbers').")
+                .long_help(
+                    "Only show line numbers, no other decorations. This is an alias for \
+                     '--style=numbers'",
+                ),
+        )
+        .arg(
+            Arg::with_name("show-all")
+                .long("show-all")
+                .alias("show-nonprintable")
+                .short("A")
+                .conflicts_with("language")
+                .help("Show non-printable characters (space, tab, newline, ..).")
+                .long_help(
+                    "Show non-printable characters like space, tab or newline. \
+                     This option can also be used to print binary files. \
+                     Use '--tabs' to control the width of the tab-placeholders."
+                ),
+        )
+        .arg(
+            Arg::with_name("line-range")
+                .long("line-range")
+                .short("r")
+                .multiple(true)
+                .takes_value(true)
+                .number_of_values(1)
+                .value_name("N:M")
+                .help("Only print the lines from N to M.")
+                .long_help(
+                    "Only print the specified range of lines for each file. \
+                     For example:\n  \
+                     '--line-range 30:40' prints lines 30 to 40\n  \
+                     '--line-range :40' prints lines 1 to 40\n  \
+                     '--line-range 40:' prints lines 40 to the end of the file",
+                ),
+        )
+        .arg(
+            Arg::with_name("highlight-line")
+                .long("highlight-line")
+                .short("H")
+                .takes_value(true)
+                .number_of_values(1)
+                .multiple(true)
+                .value_name("N")
+                .help("Highlight the given line.")
+                .long_help(
+                    "Highlight the N-th line with a different background color",
+                ),
+        )
+        .arg(
+            Arg::with_name("color")
+                .long("color")
+                .overrides_with("color")
+                .takes_value(true)
+                .value_name("when")
+                .possible_values(&["auto", "never", "always"])
+                .hide_default_value(true)
+                .default_value("auto")
+                .help("When to use colors (*auto*, never, always).")
+                .long_help(
+                    "Specify when to use colored output. The automatic mode \
+                     only enables colors if an interactive terminal is detected. \
+                     Possible values: *auto*, never, always.",
+                ),
+        )
+        .arg(
+            Arg::with_name("italic-text")
+                .long("italic-text")
+                .takes_value(true)
+                .value_name("when")
+                .possible_values(&["always", "never"])
+                .default_value("never")
+                .hide_default_value(true)
+                .help("Use italics in output (always, *never*)")
+                .long_help("Specify when to use ANSI sequences for italic text in the output. Possible values: always, *never*."),
+        )
+        .arg(
+            Arg::with_name("decorations")
+                .long("decorations")
+                .overrides_with("decorations")
+                .takes_value(true)
+                .value_name("when")
+                .possible_values(&["auto", "never", "always"])
+                .default_value("auto")
+                .hide_default_value(true)
+                .help("When to show the decorations (*auto*, never, always).")
+                .long_help(
+                    "Specify when to use the decorations that have been specified \
+                     via '--style'. The automatic mode only enables decorations if \
+                     an interactive terminal is detected. Possible values: *auto*, never, always.",
+                ),
+        )
+        .arg(
+            Arg::with_name("paging")
+                .long("paging")
+                .overrides_with("paging")
+                .takes_value(true)
+                .value_name("when")
+                .possible_values(&["auto", "never", "always"])
+                .default_value("auto")
+                .hide_default_value(true)
+                .help("Specify when to use the pager (*auto*, never, always).")
+                .long_help(
+                    "Specify when to use the pager. To control which pager \
+                     is used, set the PAGER or BAT_PAGER environment \
+                     variables (the latter takes precedence) or use the '--pager' option. \
+                     To disable the pager permanently, set BAT_PAGER to an empty string \
+                     or set '--paging=never' in the configuration file. \
+                     Possible values: *auto*, never, always.",
+                ),
+        )
+        .arg(
+            Arg::with_name("pager")
+                .long("pager")
+                .overrides_with("pager")
+                .takes_value(true)
+                .value_name("command")
+                .hidden_short_help(true)
+                .help("Determine which pager to use.")
+                .long_help(
+                    "Determine which pager is used. This option will overwrite \
+                     the PAGER and BAT_PAGER environment variables. The default \
+                     pager is 'less'. To disable the pager completely, use the \
+                     '--paging' option. \
+                     Example: '--pager \"less -RF\"'.",
+                ),
+        )
+        .arg(
+            Arg::with_name("wrap")
+                .long("wrap")
+                .overrides_with("wrap")
+                .takes_value(true)
+                .value_name("mode")
+                .possible_values(&["auto", "never", "character"])
+                .default_value("auto")
+                .hide_default_value(true)
+                .help("Specify the text-wrapping mode (*auto*, never, character).")
+                .long_help("Specify the text-wrapping mode (*auto*, never, character). \
+                           The '--terminal-width' option can be used in addition to \
+                           control the output width."),
+        )
+        .arg(
+            Arg::with_name("tabs")
+                .long("tabs")
+                .overrides_with("tabs")
+                .takes_value(true)
+                .value_name("T")
+                .validator(
+                    |t| {
+                        t.parse::<u32>()
+                            .map_err(|_t| "must be a number")
+                            .map(|_t| ()) // Convert to Result<(), &str>
+                            .map_err(|e| e.to_string())
+                    }, // Convert to Result<(), String>
+                )
+                .help("Set the tab width to T spaces.")
+                .long_help(
+                    "Set the tab width to T spaces. Use a width of 0 to pass tabs through \
+                     directly",
+                ),
+        )
+        .arg(
+            Arg::with_name("unbuffered")
+                .short("u")
+                .long("unbuffered")
+                .hidden_short_help(true)
+                .long_help(
+                    "This option exists for POSIX-compliance reasons ('u' is for \
+                     'unbuffered'). The output is always unbuffered - this option \
+                     is simply ignored.",
+                ),
+        )
+        .arg(
+            Arg::with_name("terminal-width")
+                .long("terminal-width")
+                .takes_value(true)
+                .value_name("width")
+                .hidden_short_help(true)
+                .allow_hyphen_values(true)
+                .validator(
+                    |t| {
+                        let is_offset = t.starts_with('+') || t.starts_with('-');
+                        t.parse::<i32>()
+                            .map_err(|_e| "must be an offset or number")
+                            .and_then(|v| if v == 0 && !is_offset {
+                                Err("terminal width cannot be zero".into())
+                            } else {
+                                Ok(())
+                            })
+                            .map_err(|e| e.to_string())
+                    })
+                .help(
+                    "Explicitly set the width of the terminal instead of determining it \
+                     automatically. If prefixed with '+' or '-', the value will be treated \
+                     as an offset to the actual terminal width. See also: '--wrap'.",
+                ),
+        )
+        .arg(
+            Arg::with_name("no-config")
+                .long("no-config")
+                .hidden(true)
+                .help("Do not use the configuration file"),
+        )
+        .arg(
+            Arg::with_name("config-file")
+                .long("config-file")
+                .conflicts_with("list-languages")
+                .conflicts_with("list-themes")
+                .hidden(true)
+                .help("Show path to the configuration file."),
+        )
+        .arg(
+            Arg::with_name("config-dir")
+                .long("config-dir")
+                .hidden(true)
+                .help("Show bat's configuration directory."),
+        )
+        .arg(
+            Arg::with_name("cache-dir")
+                .long("cache-dir")
+                .hidden(true)
+                .help("Show bat's cache directory."),
+        )
+        .help_message("Print this help message.")
+        .version_message("Show version information.");
+
+    // Check if the current directory contains a file name cache. Otherwise,
+    // enable the 'bat cache' subcommand.
+    if Path::new("cache").exists() {
+        app
+    } else {
+        app.subcommand(
+            SubCommand::with_name("cache")
+                .about("Modify the syntax-definition and theme cache")
+                .arg(
+                    Arg::with_name("build")
+                        .long("build")
+                        .short("b")
+                        .help("Initialize (or update) the syntax/theme cache.")
+                        .long_help(
+                            "Initialize (or update) the syntax/theme cache by loading from \
+                             the source directory (default: the configuration directory).",
+                        ),
+                )
+                .arg(
+                    Arg::with_name("clear")
+                        .long("clear")
+                        .short("c")
+                        .help("Remove the cached syntax definitions and themes."),
+                )
+                .group(
+                    ArgGroup::with_name("cache-actions")
+                        .args(&["build", "clear"])
+                        .required(true),
+                )
+                .arg(
+                    Arg::with_name("source")
+                        .long("source")
+                        .requires("build")
+                        .takes_value(true)
+                        .value_name("dir")
+                        .help("Use a different directory to load syntaxes and themes from."),
+                )
+                .arg(
+                    Arg::with_name("target")
+                        .long("target")
+                        .requires("build")
+                        .takes_value(true)
+                        .value_name("dir")
+                        .help(
+                            "Use a different directory to store the cached syntax and theme set.",
+                        ),
+                )
+                .arg(
+                    Arg::with_name("blank")
+                        .long("blank")
+                        .requires("build")
+                        .help(
+                            "Create completely new syntax and theme sets \
+                             (instead of appending to the default sets).",
+                        ),
+                ),
+        )
+    }
+}

src/bin/bat/controller.rs

@@ -0,0 +1,136 @@
+use std::io::{self, Write};
+use std::path::Path;
+
+use crate::app::{Config, PagingMode};
+use crate::assets::HighlightingAssets;
+use crate::errors::*;
+use crate::inputfile::{InputFile, InputFileReader};
+use crate::line_range::{LineRanges, RangeCheckResult};
+use crate::output::OutputType;
+use crate::printer::{InteractivePrinter, Printer, SimplePrinter};
+
+pub struct Controller<'a> {
+    config: &'a Config<'a>,
+    assets: &'a HighlightingAssets,
+}
+
+impl<'b> Controller<'b> {
+    pub fn new<'a>(config: &'a Config, assets: &'a HighlightingAssets) -> Controller<'a> {
+        Controller { config, assets }
+    }
+
+    pub fn run(&self) -> Result<bool> {
+        // Do not launch the pager if NONE of the input files exist
+        let mut paging_mode = self.config.paging_mode;
+        if self.config.paging_mode != PagingMode::Never {
+            let call_pager = self.config.files.iter().any(|file| {
+                if let InputFile::Ordinary(path) = file {
+                    return Path::new(path).exists();
+                } else {
+                    return true;
+                }
+            });
+            if !call_pager {
+                paging_mode = PagingMode::Never;
+            }
+        }
+
+        let mut output_type = OutputType::from_mode(paging_mode, self.config.pager)?;
+        let writer = output_type.handle()?;
+        let mut no_errors: bool = true;
+
+        let stdin = io::stdin();
+
+        for input_file in &self.config.files {
+            match input_file.get_reader(&stdin) {
+                Err(error) => {
+                    handle_error(&error);
+                    no_errors = false;
+                }
+                Ok(mut reader) => {
+                    let result = if self.config.loop_through {
+                        let mut printer = SimplePrinter::new();
+                        self.print_file(reader, &mut printer, writer, *input_file)
+                    } else {
+                        let mut printer = InteractivePrinter::new(
+                            &self.config,
+                            &self.assets,
+                            *input_file,
+                            &mut reader,
+                        );
+                        self.print_file(reader, &mut printer, writer, *input_file)
+                    };
+
+                    if let Err(error) = result {
+                        handle_error(&error);
+                        no_errors = false;
+                    }
+                }
+            }
+        }
+
+        Ok(no_errors)
+    }
+
+    fn print_file<'a, P: Printer>(
+        &self,
+        reader: InputFileReader,
+        printer: &mut P,
+        writer: &mut dyn Write,
+        input_file: InputFile<'a>,
+    ) -> Result<()> {
+        printer.print_header(writer, input_file)?;
+        if !reader.first_line.is_empty() {
+            self.print_file_ranges(printer, writer, reader, &self.config.line_ranges)?;
+        }
+        printer.print_footer(writer)?;
+
+        Ok(())
+    }
+
+    fn print_file_ranges<P: Printer>(
+        &self,
+        printer: &mut P,
+        writer: &mut dyn Write,
+        mut reader: InputFileReader,
+        line_ranges: &LineRanges,
+    ) -> Result<()> {
+        let mut line_buffer = Vec::new();
+        let mut line_number: usize = 1;
+
+        let mut first_range: bool = true;
+        let mut mid_range: bool = false;
+
+        while reader.read_line(&mut line_buffer)? {
+            match line_ranges.check(line_number) {
+                RangeCheckResult::OutsideRange => {
+                    // Call the printer in case we need to call the syntax highlighter
+                    // for this line. However, set `out_of_range` to `true`.
+                    printer.print_line(true, writer, line_number, &line_buffer)?;
+                    mid_range = false;
+                }
+
+                RangeCheckResult::InRange => {
+                    if self.config.output_components.snip() {
+                        if first_range {
+                            first_range = false;
+                            mid_range = true;
+                        } else if !mid_range {
+                            mid_range = true;
+                            printer.print_snip(writer)?;
+                        }
+                    }
+
+                    printer.print_line(false, writer, line_number, &line_buffer)?;
+                }
+                RangeCheckResult::AfterLastRange => {
+                    break;
+                }
+            }
+
+            line_number += 1;
+            line_buffer.clear();
+        }
+        Ok(())
+    }
+}

src/bin/bat/decorations.rs

@@ -0,0 +1,154 @@
+use crate::diff::LineChange;
+use crate::printer::{Colors, InteractivePrinter};
+use ansi_term::Style;
+
+#[derive(Clone)]
+pub struct DecorationText {
+    pub width: usize,
+    pub text: String,
+}
+
+pub trait Decoration {
+    fn generate(
+        &self,
+        line_number: usize,
+        continuation: bool,
+        printer: &InteractivePrinter,
+    ) -> DecorationText;
+    fn width(&self) -> usize;
+}
+
+pub struct LineNumberDecoration {
+    color: Style,
+    cached_wrap: DecorationText,
+    cached_wrap_invalid_at: usize,
+}
+
+impl LineNumberDecoration {
+    pub fn new(colors: &Colors) -> Self {
+        LineNumberDecoration {
+            color: colors.line_number,
+            cached_wrap_invalid_at: 10000,
+            cached_wrap: DecorationText {
+                text: colors.line_number.paint(" ".repeat(4)).to_string(),
+                width: 4,
+            },
+        }
+    }
+}
+
+impl Decoration for LineNumberDecoration {
+    fn generate(
+        &self,
+        line_number: usize,
+        continuation: bool,
+        _printer: &InteractivePrinter,
+    ) -> DecorationText {
+        if continuation {
+            if line_number > self.cached_wrap_invalid_at {
+                let new_width = self.cached_wrap.width + 1;
+                return DecorationText {
+                    text: self.color.paint(" ".repeat(new_width)).to_string(),
+                    width: new_width,
+                };
+            }
+
+            self.cached_wrap.clone()
+        } else {
+            let plain: String = format!("{:4}", line_number);
+            DecorationText {
+                width: plain.len(),
+                text: self.color.paint(plain).to_string(),
+            }
+        }
+    }
+
+    fn width(&self) -> usize {
+        4
+    }
+}
+
+pub struct LineChangesDecoration {
+    cached_none: DecorationText,
+    cached_added: DecorationText,
+    cached_removed_above: DecorationText,
+    cached_removed_below: DecorationText,
+    cached_modified: DecorationText,
+}
+
+impl LineChangesDecoration {
+    #[inline]
+    fn generate_cached(style: Style, text: &str) -> DecorationText {
+        DecorationText {
+            text: style.paint(text).to_string(),
+            width: text.chars().count(),
+        }
+    }
+
+    pub fn new(colors: &Colors) -> Self {
+        LineChangesDecoration {
+            cached_none: Self::generate_cached(Style::default(), " "),
+            cached_added: Self::generate_cached(colors.git_added, "+"),
+            cached_removed_above: Self::generate_cached(colors.git_removed, "‾"),
+            cached_removed_below: Self::generate_cached(colors.git_removed, "_"),
+            cached_modified: Self::generate_cached(colors.git_modified, "~"),
+        }
+    }
+}
+
+impl Decoration for LineChangesDecoration {
+    fn generate(
+        &self,
+        line_number: usize,
+        continuation: bool,
+        printer: &InteractivePrinter,
+    ) -> DecorationText {
+        if !continuation {
+            if let Some(ref changes) = printer.line_changes {
+                return match changes.get(&(line_number as u32)) {
+                    Some(&LineChange::Added) => self.cached_added.clone(),
+                    Some(&LineChange::RemovedAbove) => self.cached_removed_above.clone(),
+                    Some(&LineChange::RemovedBelow) => self.cached_removed_below.clone(),
+                    Some(&LineChange::Modified) => self.cached_modified.clone(),
+                    _ => self.cached_none.clone(),
+                };
+            }
+        }
+
+        self.cached_none.clone()
+    }
+
+    fn width(&self) -> usize {
+        self.cached_none.width
+    }
+}
+
+pub struct GridBorderDecoration {
+    cached: DecorationText,
+}
+
+impl GridBorderDecoration {
+    pub fn new(colors: &Colors) -> Self {
+        GridBorderDecoration {
+            cached: DecorationText {
+                text: colors.grid.paint("│").to_string(),
+                width: 1,
+            },
+        }
+    }
+}
+
+impl Decoration for GridBorderDecoration {
+    fn generate(
+        &self,
+        _line_number: usize,
+        _continuation: bool,
+        _printer: &InteractivePrinter,
+    ) -> DecorationText {
+        self.cached.clone()
+    }
+
+    fn width(&self) -> usize {
+        self.cached.width
+    }
+}

src/bin/bat/main.rs

@@ -0,0 +1,265 @@
+// `error_chain!` can recurse deeply
+#![recursion_limit = "1024"]
+
+#[macro_use]
+extern crate error_chain;
+
+#[macro_use]
+extern crate clap;
+
+#[macro_use]
+extern crate lazy_static;
+
+extern crate ansi_term;
+extern crate atty;
+extern crate console;
+extern crate content_inspector;
+extern crate dirs as dirs_rs;
+extern crate encoding;
+extern crate git2;
+extern crate shell_words;
+extern crate syntect;
+extern crate wild;
+
+mod app;
+mod assets;
+mod clap_app;
+mod config;
+mod controller;
+mod decorations;
+mod diff;
+mod dirs;
+mod inputfile;
+mod line_range;
+mod output;
+mod preprocessor;
+mod printer;
+mod style;
+mod syntax_mapping;
+mod terminal;
+mod util;
+
+use std::collections::HashSet;
+use std::io;
+use std::io::Write;
+use std::path::Path;
+use std::process;
+
+use ansi_term::Colour::Green;
+use ansi_term::Style;
+
+use crate::app::{App, Config};
+use crate::assets::{cache_dir, clear_assets, config_dir, HighlightingAssets};
+use crate::config::config_file;
+use crate::controller::Controller;
+use crate::inputfile::InputFile;
+use crate::style::{OutputComponent, OutputComponents};
+
+mod errors {
+    error_chain! {
+        foreign_links {
+            Clap(::clap::Error);
+            Io(::std::io::Error);
+            SyntectError(::syntect::LoadingError);
+            ParseIntError(::std::num::ParseIntError);
+        }
+    }
+
+    pub fn handle_error(error: &Error) {
+        match error {
+            Error(ErrorKind::Io(ref io_error), _)
+                if io_error.kind() == super::io::ErrorKind::BrokenPipe =>
+            {
+                super::process::exit(0);
+            }
+            _ => {
+                use ansi_term::Colour::Red;
+                eprintln!("{}: {}", Red.paint("[bat error]"), error);
+            }
+        };
+    }
+}
+
+use crate::errors::*;
+
+fn run_cache_subcommand(matches: &clap::ArgMatches) -> Result<()> {
+    if matches.is_present("build") {
+        let source_dir = matches.value_of("source").map(Path::new);
+        let target_dir = matches.value_of("target").map(Path::new);
+
+        let blank = matches.is_present("blank");
+
+        let assets = HighlightingAssets::from_files(source_dir, blank)?;
+        assets.save(target_dir)?;
+    } else if matches.is_present("clear") {
+        clear_assets();
+    }
+
+    Ok(())
+}
+
+pub fn list_languages(config: &Config) -> Result<()> {
+    let assets = HighlightingAssets::new();
+    let mut languages = assets
+        .syntax_set
+        .syntaxes()
+        .iter()
+        .filter(|syntax| !syntax.hidden && !syntax.file_extensions.is_empty())
+        .collect::<Vec<_>>();
+    languages.sort_by_key(|lang| lang.name.to_uppercase());
+
+    let stdout = io::stdout();
+    let mut stdout = stdout.lock();
+
+    if config.loop_through {
+        for lang in languages {
+            write!(stdout, "{}:{}\n", lang.name, lang.file_extensions.join(","))?;
+        }
+    } 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!(stdout, "{:width$}{}", lang.name, separator, width = longest)?;
+
+            // Number of characters on this line so far, wrap before `desired_width`
+            let mut num_chars = 0;
+
+            let mut extension = lang.file_extensions.iter().peekable();
+            while let Some(word) = extension.next() {
+                // If we can't fit this word in, then create a line break and align it in.
+                let new_chars = word.len() + comma_separator.len();
+                if num_chars + new_chars >= desired_width {
+                    num_chars = 0;
+                    write!(stdout, "\n{:width$}{}", "", separator, width = longest)?;
+                }
+
+                num_chars += new_chars;
+                write!(stdout, "{}", style.paint(&word[..]))?;
+                if extension.peek().is_some() {
+                    write!(stdout, "{}", comma_separator)?;
+                }
+            }
+            writeln!(stdout)?;
+        }
+    }
+
+    Ok(())
+}
+
+pub fn list_themes(cfg: &Config) -> Result<()> {
+    let assets = HighlightingAssets::new();
+    let themes = &assets.theme_set.themes;
+    let mut config = cfg.clone();
+    let mut style = HashSet::new();
+    style.insert(OutputComponent::Plain);
+    config.files = vec![InputFile::ThemePreviewFile];
+    config.output_components = OutputComponents(style);
+
+    let stdout = io::stdout();
+    let mut stdout = stdout.lock();
+
+    if config.colored_output {
+        for (theme, _) in themes.iter() {
+            writeln!(
+                stdout,
+                "Theme: {}\n",
+                Style::new().bold().paint(theme.to_string())
+            )?;
+            config.theme = theme.to_string();
+            let _controller = Controller::new(&config, &assets).run();
+            writeln!(stdout)?;
+        }
+    } else {
+        for (theme, _) in themes.iter() {
+            writeln!(stdout, "{}", theme)?;
+        }
+    }
+
+    Ok(())
+}
+
+fn run_controller(config: &Config) -> Result<bool> {
+    let assets = HighlightingAssets::new();
+    let controller = Controller::new(&config, &assets);
+    controller.run()
+}
+
+/// Returns `Err(..)` upon fatal errors. Otherwise, returns `Ok(true)` on full success and
+/// `Ok(false)` if any intermediate errors occurred (were printed).
+fn run() -> Result<bool> {
+    let app = App::new()?;
+
+    match app.matches.subcommand() {
+        ("cache", Some(cache_matches)) => {
+            // If there is a file named 'cache' in the current working directory,
+            // arguments for subcommand 'cache' are not mandatory.
+            // If there are non-zero arguments, execute the subcommand cache, else, open the file cache.
+            if !cache_matches.args.is_empty() {
+                run_cache_subcommand(cache_matches)?;
+                Ok(true)
+            } else {
+                let mut config = app.config()?;
+                config.files = vec![InputFile::Ordinary(&"cache")];
+
+                run_controller(&config)
+            }
+        }
+        _ => {
+            let config = app.config()?;
+
+            if app.matches.is_present("list-languages") {
+                list_languages(&config)?;
+
+                Ok(true)
+            } else if app.matches.is_present("list-themes") {
+                list_themes(&config)?;
+
+                Ok(true)
+            } else if app.matches.is_present("config-file") {
+                println!("{}", config_file().to_string_lossy());
+
+                Ok(true)
+            } else if app.matches.is_present("config-dir") {
+                writeln!(io::stdout(), "{}", config_dir())?;
+                Ok(true)
+            } else if app.matches.is_present("cache-dir") {
+                writeln!(io::stdout(), "{}", cache_dir())?;
+                Ok(true)
+            } else {
+                run_controller(&config)
+            }
+        }
+    }
+}
+
+fn main() {
+    let result = run();
+
+    match result {
+        Err(error) => {
+            handle_error(&error);
+            process::exit(1);
+        }
+        Ok(false) => {
+            process::exit(1);
+        }
+        Ok(true) => {
+            process::exit(0);
+        }
+    }
+}

src/bin/bat/output.rs

@@ -0,0 +1,118 @@
+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;
+
+use crate::app::PagingMode;
+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 dyn 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();
+        }
+    }
+}

src/bin/bat/printer.rs

@@ -0,0 +1,601 @@
+use std::io::Write;
+use std::vec::Vec;
+
+use ansi_term::Colour::{Fixed, Green, Red, Yellow};
+use ansi_term::Style;
+
+use console::AnsiCodeIterator;
+
+use syntect::easy::HighlightLines;
+use syntect::highlighting::Color;
+use syntect::highlighting::Theme;
+use syntect::parsing::SyntaxSet;
+
+use content_inspector::ContentType;
+
+use encoding::all::{UTF_16BE, UTF_16LE};
+use encoding::{DecoderTrap, Encoding};
+
+use crate::app::Config;
+use crate::assets::HighlightingAssets;
+use crate::decorations::{
+    Decoration, GridBorderDecoration, LineChangesDecoration, LineNumberDecoration,
+};
+use crate::diff::get_git_diff;
+use crate::diff::LineChanges;
+use crate::errors::*;
+use crate::inputfile::{InputFile, InputFileReader};
+use crate::preprocessor::{expand_tabs, replace_nonprintable};
+use crate::style::OutputWrap;
+use crate::terminal::{as_terminal_escaped, to_ansi_color};
+
+pub trait Printer {
+    fn print_header(&mut self, handle: &mut dyn Write, file: InputFile) -> Result<()>;
+    fn print_footer(&mut self, handle: &mut dyn Write) -> Result<()>;
+
+    fn print_snip(&mut self, handle: &mut dyn Write) -> Result<()>;
+
+    fn print_line(
+        &mut self,
+        out_of_range: bool,
+        handle: &mut dyn Write,
+        line_number: usize,
+        line_buffer: &[u8],
+    ) -> Result<()>;
+}
+
+pub struct SimplePrinter;
+
+impl SimplePrinter {
+    pub fn new() -> Self {
+        SimplePrinter {}
+    }
+}
+
+impl Printer for SimplePrinter {
+    fn print_header(&mut self, _handle: &mut dyn Write, _file: InputFile) -> Result<()> {
+        Ok(())
+    }
+
+    fn print_footer(&mut self, _handle: &mut dyn Write) -> Result<()> {
+        Ok(())
+    }
+
+    fn print_snip(&mut self, _handle: &mut dyn Write) -> Result<()> {
+        Ok(())
+    }
+
+    fn print_line(
+        &mut self,
+        out_of_range: bool,
+        handle: &mut dyn Write,
+        _line_number: usize,
+        line_buffer: &[u8],
+    ) -> Result<()> {
+        if !out_of_range {
+            handle.write_all(line_buffer)?;
+        }
+        Ok(())
+    }
+}
+
+pub struct InteractivePrinter<'a> {
+    colors: Colors,
+    config: &'a Config<'a>,
+    decorations: Vec<Box<dyn Decoration>>,
+    panel_width: usize,
+    ansi_prefix_sgr: String,
+    content_type: Option<ContentType>,
+    pub line_changes: Option<LineChanges>,
+    highlighter: Option<HighlightLines<'a>>,
+    syntax_set: &'a SyntaxSet,
+    background_color_highlight: Option<Color>,
+}
+
+impl<'a> InteractivePrinter<'a> {
+    pub fn new(
+        config: &'a Config,
+        assets: &'a HighlightingAssets,
+        file: InputFile,
+        reader: &mut InputFileReader,
+    ) -> Self {
+        let theme = assets.get_theme(&config.theme);
+
+        let background_color_highlight = theme.settings.line_highlight;
+
+        let colors = if config.colored_output {
+            Colors::colored(theme, config.true_color)
+        } else {
+            Colors::plain()
+        };
+
+        // Create decorations.
+        let mut decorations: Vec<Box<dyn Decoration>> = Vec::new();
+
+        if config.output_components.numbers() {
+            decorations.push(Box::new(LineNumberDecoration::new(&colors)));
+        }
+
+        if config.output_components.changes() {
+            decorations.push(Box::new(LineChangesDecoration::new(&colors)));
+        }
+
+        let mut panel_width: usize =
+            decorations.len() + decorations.iter().fold(0, |a, x| a + x.width());
+
+        // The grid border decoration isn't added until after the panel_width calculation, since the
+        // print_horizontal_line, print_header, and print_footer functions all assume the panel
+        // width is without the grid border.
+        if config.output_components.grid() && !decorations.is_empty() {
+            decorations.push(Box::new(GridBorderDecoration::new(&colors)));
+        }
+
+        // Disable the panel if the terminal is too small (i.e. can't fit 5 characters with the
+        // panel showing).
+        if config.term_width
+            < (decorations.len() + decorations.iter().fold(0, |a, x| a + x.width())) + 5
+        {
+            decorations.clear();
+            panel_width = 0;
+        }
+
+        let mut line_changes = None;
+
+        let highlighter = if reader
+            .content_type
+            .map_or(false, |c| c.is_binary() && !config.show_nonprintable)
+        {
+            None
+        } else {
+            // Get the Git modifications
+            line_changes = if config.output_components.changes() {
+                match file {
+                    InputFile::Ordinary(filename) => get_git_diff(filename),
+                    _ => None,
+                }
+            } else {
+                None
+            };
+
+            // Determine the type of syntax for highlighting
+            let syntax = assets.get_syntax(config.language, file, reader, &config.syntax_mapping);
+            Some(HighlightLines::new(syntax, theme))
+        };
+
+        InteractivePrinter {
+            panel_width,
+            colors,
+            config,
+            decorations,
+            content_type: reader.content_type,
+            ansi_prefix_sgr: String::new(),
+            line_changes,
+            highlighter,
+            syntax_set: &assets.syntax_set,
+            background_color_highlight,
+        }
+    }
+
+    fn print_horizontal_line(&mut self, handle: &mut dyn Write, grid_char: char) -> Result<()> {
+        if self.panel_width == 0 {
+            writeln!(
+                handle,
+                "{}",
+                self.colors.grid.paint("─".repeat(self.config.term_width))
+            )?;
+        } else {
+            let hline = "─".repeat(self.config.term_width - (self.panel_width + 1));
+            let hline = format!("{}{}{}", "─".repeat(self.panel_width), grid_char, hline);
+            writeln!(handle, "{}", self.colors.grid.paint(hline))?;
+        }
+
+        Ok(())
+    }
+
+    fn create_fake_panel(&self, text: &str) -> String {
+        if self.panel_width == 0 {
+            "".to_string()
+        } else {
+            let text_truncated: String = text.chars().take(self.panel_width - 1).collect();
+            let text_filled: String = format!(
+                "{}{}",
+                text_truncated,
+                " ".repeat(self.panel_width - 1 - text_truncated.len())
+            );
+            if self.config.output_components.grid() {
+                format!("{} │ ", text_filled)
+            } else {
+                format!("{}", text_filled)
+            }
+        }
+    }
+
+    fn preprocess(&self, text: &str, cursor: &mut usize) -> String {
+        if self.config.tab_width > 0 {
+            expand_tabs(text, self.config.tab_width, cursor)
+        } else {
+            text.to_string()
+        }
+    }
+}
+
+impl<'a> Printer for InteractivePrinter<'a> {
+    fn print_header(&mut self, handle: &mut dyn Write, file: InputFile) -> Result<()> {
+        if !self.config.output_components.header() {
+            if Some(ContentType::BINARY) == self.content_type && !self.config.show_nonprintable {
+                let input = match file {
+                    InputFile::Ordinary(filename) => format!("file '{}'", filename),
+                    _ => "STDIN".into(),
+                };
+
+                writeln!(
+                    handle,
+                    "{}: Binary content from {} will not be printed to the terminal \
+                     (but will be present if the output of 'bat' is piped). You can use 'bat -A' \
+                     to show the binary file contents.",
+                    Yellow.paint("[bat warning]"),
+                    input
+                )?;
+            } else {
+                if self.config.output_components.grid() {
+                    self.print_horizontal_line(handle, '┬')?;
+                }
+            }
+            return Ok(());
+        }
+
+        if self.config.output_components.grid() {
+            self.print_horizontal_line(handle, '┬')?;
+
+            write!(
+                handle,
+                "{}{}",
+                " ".repeat(self.panel_width),
+                self.colors
+                    .grid
+                    .paint(if self.panel_width > 0 { "│ " } else { "" }),
+            )?;
+        } else {
+            write!(handle, "{}", " ".repeat(self.panel_width))?;
+        }
+
+        let (prefix, name) = match file {
+            InputFile::Ordinary(filename) => ("File: ", filename),
+            _ => ("", "STDIN"),
+        };
+
+        let mode = match self.content_type {
+            Some(ContentType::BINARY) => "   <BINARY>",
+            Some(ContentType::UTF_16LE) => "   <UTF-16LE>",
+            Some(ContentType::UTF_16BE) => "   <UTF-16BE>",
+            None => "   <EMPTY>",
+            _ => "",
+        };
+
+        writeln!(
+            handle,
+            "{}{}{}",
+            prefix,
+            self.colors.filename.paint(name),
+            mode
+        )?;
+
+        if self.config.output_components.grid() {
+            if self.content_type.map_or(false, |c| c.is_text()) || self.config.show_nonprintable {
+                self.print_horizontal_line(handle, '┼')?;
+            } else {
+                self.print_horizontal_line(handle, '┴')?;
+            }
+        }
+
+        Ok(())
+    }
+
+    fn print_footer(&mut self, handle: &mut dyn Write) -> Result<()> {
+        if self.config.output_components.grid()
+            && (self.content_type.map_or(false, |c| c.is_text()) || self.config.show_nonprintable)
+        {
+            self.print_horizontal_line(handle, '┴')
+        } else {
+            Ok(())
+        }
+    }
+
+    fn print_snip(&mut self, handle: &mut dyn Write) -> Result<()> {
+        let panel = self.create_fake_panel(" ...");
+        let panel_count = panel.chars().count();
+
+        let title = "8<";
+        let title_count = title.chars().count();
+
+        let snip_left = "─ ".repeat((self.config.term_width - panel_count - (title_count / 2)) / 4);
+        let snip_left_count = snip_left.chars().count(); // Can't use .len() with Unicode.
+
+        let snip_right =
+            " ─".repeat((self.config.term_width - panel_count - snip_left_count - title_count) / 2);
+
+        write!(
+            handle,
+            "{}\n",
+            self.colors
+                .grid
+                .paint(format!("{}{}{}{}", panel, snip_left, title, snip_right))
+        )?;
+
+        Ok(())
+    }
+
+    fn print_line(
+        &mut self,
+        out_of_range: bool,
+        handle: &mut dyn Write,
+        line_number: usize,
+        line_buffer: &[u8],
+    ) -> Result<()> {
+        let line = if self.config.show_nonprintable {
+            replace_nonprintable(&line_buffer, self.config.tab_width)
+        } else {
+            match self.content_type {
+                Some(ContentType::BINARY) | None => {
+                    return Ok(());
+                }
+                Some(ContentType::UTF_16LE) => UTF_16LE
+                    .decode(&line_buffer, DecoderTrap::Replace)
+                    .map_err(|_| "Invalid UTF-16LE")?,
+                Some(ContentType::UTF_16BE) => UTF_16BE
+                    .decode(&line_buffer, DecoderTrap::Replace)
+                    .map_err(|_| "Invalid UTF-16BE")?,
+                _ => String::from_utf8_lossy(&line_buffer).to_string(),
+            }
+        };
+
+        let regions = {
+            let highlighter = match self.highlighter {
+                Some(ref mut highlighter) => highlighter,
+                _ => {
+                    return Ok(());
+                }
+            };
+            highlighter.highlight(line.as_ref(), self.syntax_set)
+        };
+
+        if out_of_range {
+            return Ok(());
+        }
+
+        let mut cursor: usize = 0;
+        let mut cursor_max: usize = self.config.term_width;
+        let mut cursor_total: usize = 0;
+        let mut panel_wrap: Option<String> = None;
+
+        // Line highlighting
+        let highlight_this_line = self
+            .config
+            .highlight_lines
+            .iter()
+            .any(|&l| l == line_number);
+
+        let background_color = self
+            .background_color_highlight
+            .filter(|_| highlight_this_line);
+
+        // Line decorations.
+        if self.panel_width > 0 {
+            let decorations = self
+                .decorations
+                .iter()
+                .map(|ref d| d.generate(line_number, false, self))
+                .collect::<Vec<_>>();
+
+            for deco in decorations {
+                write!(handle, "{} ", deco.text)?;
+                cursor_max -= deco.width + 1;
+            }
+        }
+
+        // Line contents.
+        if self.config.output_wrap == OutputWrap::None {
+            let true_color = self.config.true_color;
+            let colored_output = self.config.colored_output;
+            let italics = self.config.use_italic_text;
+
+            for &(style, region) in regions.iter() {
+                let text = &*self.preprocess(region, &mut cursor_total);
+                let text_trimmed = text.trim_end_matches(|c| c == '\r' || c == '\n');
+                write!(
+                    handle,
+                    "{}",
+                    as_terminal_escaped(
+                        style,
+                        text_trimmed,
+                        true_color,
+                        colored_output,
+                        italics,
+                        background_color
+                    )
+                )?;
+
+                if text.len() != text_trimmed.len() {
+                    if let Some(background_color) = background_color {
+                        let mut ansi_style = Style::default();
+                        ansi_style.background = Some(to_ansi_color(background_color, true_color));
+                        let width = if cursor_total <= cursor_max {
+                            cursor_max - cursor_total + 1
+                        } else {
+                            0
+                        };
+                        write!(handle, "{}", ansi_style.paint(" ".repeat(width)))?;
+                    }
+                    write!(handle, "{}", &text[text_trimmed.len()..])?;
+                }
+            }
+
+            if line.bytes().next_back() != Some(b'\n') {
+                writeln!(handle)?;
+            }
+        } else {
+            for &(style, region) in regions.iter() {
+                let ansi_iterator = AnsiCodeIterator::new(region);
+                let mut ansi_prefix: String = String::new();
+                for chunk in ansi_iterator {
+                    match chunk {
+                        // ANSI escape passthrough.
+                        (text, true) => {
+                            let is_ansi_csi = text.starts_with("\x1B[");
+
+                            if is_ansi_csi && text.ends_with('m') {
+                                // It's an ANSI SGR sequence.
+                                // We should be mostly safe to just append these together.
+                                ansi_prefix.push_str(text);
+                                if text == "\x1B[0m" {
+                                    self.ansi_prefix_sgr = "\x1B[0m".to_owned();
+                                } else {
+                                    self.ansi_prefix_sgr.push_str(text);
+                                }
+                            } else if is_ansi_csi {
+                                // It's a regular CSI sequence.
+                                // We should be mostly safe to just append these together.
+                                ansi_prefix.push_str(text);
+                            } else {
+                                // It's probably a VT100 code.
+                                // Passing it through is the safest bet.
+                                write!(handle, "{}", text)?;
+                            }
+                        }
+
+                        // Regular text.
+                        (text, false) => {
+                            let text = self.preprocess(
+                                text.trim_end_matches(|c| c == '\r' || c == '\n'),
+                                &mut cursor_total,
+                            );
+
+                            let mut chars = text.chars();
+                            let mut remaining = text.chars().count();
+
+                            while remaining > 0 {
+                                let available = cursor_max - cursor;
+
+                                // It fits.
+                                if remaining <= available {
+                                    let text = chars.by_ref().take(remaining).collect::<String>();
+                                    cursor += remaining;
+
+                                    write!(
+                                        handle,
+                                        "{}",
+                                        as_terminal_escaped(
+                                            style,
+                                            &*format!(
+                                                "{}{}{}",
+                                                self.ansi_prefix_sgr, ansi_prefix, text
+                                            ),
+                                            self.config.true_color,
+                                            self.config.colored_output,
+                                            self.config.use_italic_text,
+                                            background_color
+                                        )
+                                    )?;
+                                    break;
+                                }
+
+                                // Generate wrap padding if not already generated.
+                                if panel_wrap.is_none() {
+                                    panel_wrap = if self.panel_width > 0 {
+                                        Some(format!(
+                                            "{} ",
+                                            self.decorations
+                                                .iter()
+                                                .map(|ref d| d
+                                                    .generate(line_number, true, self)
+                                                    .text)
+                                                .collect::<Vec<String>>()
+                                                .join(" ")
+                                        ))
+                                    } else {
+                                        Some("".to_string())
+                                    }
+                                }
+
+                                // It wraps.
+                                let text = chars.by_ref().take(available).collect::<String>();
+                                cursor = 0;
+                                remaining -= available;
+
+                                write!(
+                                    handle,
+                                    "{}\n{}",
+                                    as_terminal_escaped(
+                                        style,
+                                        &*format!(
+                                            "{}{}{}",
+                                            self.ansi_prefix_sgr, ansi_prefix, text
+                                        ),
+                                        self.config.true_color,
+                                        self.config.colored_output,
+                                        self.config.use_italic_text,
+                                        background_color
+                                    ),
+                                    panel_wrap.clone().unwrap()
+                                )?;
+                            }
+
+                            // Clear the ANSI prefix buffer.
+                            ansi_prefix.clear();
+                        }
+                    }
+                }
+            }
+
+            if let Some(background_color) = background_color {
+                let mut ansi_style = Style::default();
+                ansi_style.background =
+                    Some(to_ansi_color(background_color, self.config.true_color));
+
+                write!(
+                    handle,
+                    "{}",
+                    ansi_style.paint(" ".repeat(cursor_max - cursor))
+                )?;
+            }
+            writeln!(handle)?;
+        }
+
+        Ok(())
+    }
+}
+
+const DEFAULT_GUTTER_COLOR: u8 = 238;
+
+#[derive(Default)]
+pub struct Colors {
+    pub grid: Style,
+    pub filename: Style,
+    pub git_added: Style,
+    pub git_removed: Style,
+    pub git_modified: Style,
+    pub line_number: Style,
+}
+
+impl Colors {
+    fn plain() -> Self {
+        Colors::default()
+    }
+
+    fn colored(theme: &Theme, true_color: bool) -> Self {
+        let gutter_color = theme
+            .settings
+            .gutter_foreground
+            .map(|c| to_ansi_color(c, true_color))
+            .unwrap_or(Fixed(DEFAULT_GUTTER_COLOR));
+
+        Colors {
+            grid: gutter_color.normal(),
+            filename: Style::new().bold(),
+            git_added: Green.normal(),
+            git_removed: Red.normal(),
+            git_modified: Yellow.normal(),
+            line_number: gutter_color.normal(),
+        }
+    }
+}