From 87642c0afd113c7fbb66e3242ae0d889768e22f7 Mon Sep 17 00:00:00 2001 From: zztkm <zztkm@tsurutatakumi.info> Date: Sun, 2 Jun 2024 01:50:28 +0900 Subject: [PATCH] =?UTF-8?q?cat=20=E5=AE=9F=E8=A3=85?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- Cargo.lock | 237 ++++++++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 1 + Makefile | 11 +++ README.md | 34 ++++++++ src/main.rs | 49 ++++++++++- 5 files changed, 331 insertions(+), 1 deletion(-) create mode 100644 Cargo.lock create mode 100644 Makefile diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..93f3a11 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,237 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "anstream" +version = "0.6.14" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "418c75fa768af9c03be99d17643f93f79bbba589895012a80e3452a19ddda15b" 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cargo build + +.PHONY: fmt +fmt: + cargo fmt + +.PHONY: lint +lint: + cargo clippy diff --git a/README.md b/README.md index 183426d..b2b1fd6 100644 --- a/README.md +++ b/README.md @@ -2,3 +2,37 @@ zztkm tool box. +Rust の練習がてら Linux コマンドを再実装したり、自分がほしいコマンドを実装したりしています。 + +## Usage + +```bash +# 引数がない場合は標準入力から読み取ります +$ cat README.md | cargo run -- cat at 01:46:25 + Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.02s + Running `target/debug/ztb cat` +# ztb + +zztkm tool box. + +# 引数ありの場合 +$ cargo run -- cat README.md Makefile at 01:48:46 + Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.01s + Running `target/debug/ztb cat README.md Makefile` +# ztb + +zztkm tool box. + +.PHONY: all +all: + cargo build + +.PHONY: fmt +fmt: + cargo fmt + +.PHONY: lint +lint: + cargo clippy +``` + diff --git a/src/main.rs b/src/main.rs index e7a11a9..90e8c4e 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,3 +1,50 @@ +use clap::{Parser, Subcommand}; +use std::io::{Read, Write}; + +#[derive(Parser)] +struct Cli { + #[command(subcommand)] + command: Commands, +} + +#[derive(Subcommand)] +enum Commands { + Cat { files: Option<Vec<String>> }, +} + fn main() { - println!("Hello, world!"); + let cli = Cli::parse(); + + match &cli.command { + Commands::Cat { files } => { + if let Some(files) = files { + // stdout のロックを取得 + let stdout = std::io::stdout(); + let mut stdout = stdout.lock(); + + // files を入力順に stdout に出力する + // 最後のファイルは改行をしない + let mut iter = files.iter().peekable(); + while let Some(file) = iter.next() { + let content = std::fs::read_to_string(file).unwrap(); + if iter.peek().is_none() { + write!(&mut stdout, "{}", content).unwrap(); + } else { + writeln!(&mut stdout, "{}", content).unwrap(); + } + } + } else { + // files の指定がない場合は標準入力から読み取る + let mut buffer = String::new(); + let stdin = std::io::stdin(); + let mut stdin = stdin.lock(); + stdin.read_to_string(&mut buffer).unwrap(); + + // 標準出力に書き込む + let stdout = std::io::stdout(); + let mut stdout = stdout.lock(); + write!(&mut stdout, "{}", buffer).unwrap(); + } + } + } }