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|
use atty::{self, Stream};
use clap::{App as ClapApp, AppSettings, Arg, ArgGroup, ArgMatches, SubCommand};
use console::Term;
use errors::*;
use std::collections::HashSet;
use std::env;
use style::{OutputComponent, OutputComponents};
pub struct App {
pub matches: ArgMatches<'static>,
interactive_output: bool,
}
impl App {
pub fn new() -> Self {
let interactive_output = atty::is(Stream::Stdout);
App {
matches: Self::matches(interactive_output),
interactive_output,
}
}
fn matches(interactive_output: bool) -> ArgMatches<'static> {
let clap_color_setting = if interactive_output {
AppSettings::ColoredHelp
} else {
AppSettings::ColorNever
};
ClapApp::new(crate_name!())
.version(crate_version!())
.global_setting(clap_color_setting)
.global_setting(AppSettings::DeriveDisplayOrder)
.global_setting(AppSettings::UnifiedHelpMessage)
.global_setting(AppSettings::NextLineHelp)
.setting(AppSettings::InferSubcommands)
.setting(AppSettings::ArgsNegateSubcommands)
.setting(AppSettings::DisableHelpSubcommand)
.setting(AppSettings::VersionlessSubcommands)
.max_term_width(90)
.about(crate_description!())
.arg(
Arg::with_name("language")
.short("l")
.long("language")
.help("Set the language for highlighting")
.takes_value(true),
)
.arg(
Arg::with_name("FILE")
.help("File(s) to print")
.multiple(true)
.empty_values(false),
)
.arg(
Arg::with_name("style")
.long("style")
.use_delimiter(true)
.takes_value(true)
.possible_values(&[
"auto", "full", "plain", "changes", "header", "grid", "numbers",
])
.default_value("auto")
.help("Additional info to display along with content"),
)
.arg(
Arg::with_name("color")
.long("color")
.takes_value(true)
.possible_values(&["auto", "never", "always"])
.default_value("auto")
.help("When to use colors"),
)
.arg(
Arg::with_name("paging")
.long("paging")
.takes_value(true)
.possible_values(&["auto", "never", "always"])
.default_value("auto")
.help("When to use the pager"),
)
.arg(
Arg::with_name("list-languages")
.long("list-languages")
.help("Displays supported languages"),
)
.subcommand(
SubCommand::with_name("cache")
.about("Modify the syntax-definition and theme cache")
.arg(
Arg::with_name("init")
.long("init")
.short("i")
.help("Initialize the cache by loading from the config dir"),
)
.arg(
Arg::with_name("clear")
.long("clear")
.short("c")
.help("Reset the cache"),
)
.arg(
Arg::with_name("config-dir")
.long("config-dir")
.short("d")
.help("Show the configuration directory"),
)
.group(
ArgGroup::with_name("cache-actions")
.args(&["init", "clear", "config-dir"])
.required(true),
),
)
.help_message("Print this help message.")
.version_message("Show version information.")
.get_matches()
}
pub fn config(&self) -> Result<Config> {
let files = self.files();
Ok(Config {
true_color: is_truecolor_terminal(),
output_components: self.output_components()?,
language: self.matches.value_of("language"),
colored_output: match self.matches.value_of("color") {
Some("always") => true,
Some("never") => false,
Some("auto") | _ => self.interactive_output,
},
paging: match self.matches.value_of("paging") {
Some("always") => true,
Some("never") => false,
Some("auto") | _ => if files.contains(&None) {
// 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.
self.interactive_output && !atty::is(Stream::Stdin)
} else {
self.interactive_output
},
},
term_width: Term::stdout().size().1 as usize,
files,
})
}
fn files(&self) -> Vec<Option<&str>> {
self.matches
.values_of("FILE")
.map(|values| {
values
.map(|filename| {
if filename == "-" {
None
} else {
Some(filename)
}
})
.collect()
})
.unwrap_or_else(|| vec![None]) // read from stdin (None) if no args are given
}
fn output_components(&self) -> Result<OutputComponents> {
let matches = &self.matches;
Ok(OutputComponents(
values_t!(matches.values_of("style"), OutputComponent)?
.into_iter()
.map(|style| style.components(self.interactive_output))
.fold(HashSet::new(), |mut acc, components| {
acc.extend(components.iter().cloned());
acc
}),
))
}
}
pub struct Config<'a> {
pub true_color: bool,
pub output_components: OutputComponents,
pub language: Option<&'a str>,
pub colored_output: bool,
pub paging: bool,
pub term_width: usize,
pub files: Vec<Option<&'a str>>,
}
fn is_truecolor_terminal() -> bool {
env::var("COLORTERM")
.map(|colorterm| colorterm == "truecolor" || colorterm == "24bit")
.unwrap_or(false)
}
|
