68 lines
2.1 KiB
Rust
68 lines
2.1 KiB
Rust
use super::Cmd;
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use clap::Command;
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use shitbox::args;
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use std::{
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fs::File,
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io::{self, BufRead, BufReader, Write},
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};
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use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
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#[derive(Debug, Default)]
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pub struct Rev;
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impl Cmd for Rev {
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fn cli(&self) -> clap::Command {
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Command::new("rev")
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.about("reverse lines characterwise")
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.author("Nathan Fisher")
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.args([args::header(), args::color(), args::file()])
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}
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fn run(&self, matches: &clap::ArgMatches) -> Result<(), Box<dyn std::error::Error>> {
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let color = match matches.get_one::<String>("color").map(String::as_str) {
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Some("always") => ColorChoice::Always,
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Some("ansi") => ColorChoice::AlwaysAnsi,
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Some("auto") => {
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if atty::is(atty::Stream::Stdout) {
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ColorChoice::Auto
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} else {
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ColorChoice::Never
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}
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}
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_ => ColorChoice::Never,
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};
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if let Some(files) = matches.get_many::<String>("file") {
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for (index, file) in files.enumerate() {
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if matches.get_flag("HEADER") {
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let mut stdout = StandardStream::stdout(color);
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stdout.set_color(ColorSpec::new().set_fg(Some(Color::Green)))?;
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match index {
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0 => writeln!(stdout, "===> {file} <==="),
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_ => writeln!(stdout, "\n===> {file} <==="),
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}?;
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stdout.reset()?;
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}
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rev_file(file)?;
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}
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}
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Ok(())
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}
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fn path(&self) -> Option<shitbox::Path> {
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Some(shitbox::Path::UsrBin)
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}
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}
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fn rev_file(file: &str) -> Result<(), io::Error> {
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let reader: Box<dyn BufRead> = if file == "-" {
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Box::new(BufReader::new(io::stdin()))
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} else {
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let buf = File::open(file)?;
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Box::new(BufReader::new(buf))
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};
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for line in reader.lines() {
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println!("{}", line.unwrap().chars().rev().collect::<String>());
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}
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Ok(())
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}
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