94 lines
2.5 KiB
Rust
94 lines
2.5 KiB
Rust
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/*
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* Copyright (C) 2025 Nicolás Ortega Froysa <nicolas@ortegas.org> All rights reserved.
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* Author: Nicolás Ortega Froysa <nicolas@ortegas.org>
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*/
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use std::env;
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use std::fs;
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use std::io;
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use std::io::Read;
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use std::io::Write;
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use std::process;
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// Read 1KiB of the file at a time.
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static BLOCK_SIZE:usize = 1024;
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fn main() -> io::Result<()> {
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let args:Vec<String> = env::args().collect();
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if args.len() != 3 {
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eprintln!("Usage: {} <in-file> <out-file>", args[0]);
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process::exit(1);
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}
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let in_file = fs::File::open(&args[1])?;
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let mut in_reader = io::BufReader::new(in_file);
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let out_file = fs::File::create(&args[2])?;
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let mut out_writer = io::BufWriter::new(out_file);
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let mut read_buf:[u8; BLOCK_SIZE] = [0; BLOCK_SIZE];
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let mut last_ch:char = '\0';
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let mut tab_num = 0;
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while in_reader.read(&mut read_buf)? > 0 {
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for i in read_buf {
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let ch = i as char;
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match ch {
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'[' | '{' => {
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tab_num += 1;
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out_writer.write(format!("{}\n", ch).as_bytes())?;
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for _ in 0..tab_num {
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out_writer.write(b" ")?;
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}
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last_ch = ' ';
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},
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']' | '}' => {
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tab_num -= 1;
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out_writer.write(b"\n")?;
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for _ in 0..tab_num {
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out_writer.write(b" ")?;
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}
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out_writer.write(format!("{}", ch).as_bytes())?;
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last_ch = ch;
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},
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',' => {
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out_writer.write(format!("{}\n", ch).as_bytes())?;
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for _ in 0..tab_num {
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out_writer.write(b" ")?;
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}
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last_ch = ' ';
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},
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_ => {
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let ch = ch;
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if ch != ' ' || last_ch != ' ' {
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out_writer.write(format!("{}", ch).as_bytes())?;
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last_ch = ch;
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}
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},
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}
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}
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}
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Ok(())
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}
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