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123 lines
3.7 KiB
Rust
123 lines
3.7 KiB
Rust
// Copyright 2024 The Jujutsu Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::fs::OpenOptions;
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use std::io::Write;
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use std::path::PathBuf;
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use std::process::ExitCode;
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use clap::arg;
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use clap::Parser;
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use itertools::Itertools;
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/// A fake code formatter, useful for testing
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///
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/// `fake-formatter` is similar to `cat`.
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/// `fake-formatter --reverse` is similar to `rev` (not `tac`).
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/// `fake-formatter --stdout foo` is similar to `echo foo`.
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/// `fake-formatter --stdout foo --stderr bar --fail` is similar to
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/// `echo foo; echo bar >&2; false`.
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/// `fake-formatter --tee foo` is similar to `tee foo`).
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///
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/// This program acts as a portable alternative to that class of shell commands.
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#[derive(Parser, Debug)]
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struct Args {
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/// Exit with non-successful status.
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#[arg(long, default_value_t = false)]
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fail: bool,
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/// Reverse the characters in each line when reading stdin.
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#[arg(long, default_value_t = false)]
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reverse: bool,
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/// Convert all characters to uppercase when reading stdin.
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#[arg(long, default_value_t = false)]
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uppercase: bool,
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/// Convert all characters to lowercase when reading stdin.
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#[arg(long, default_value_t = false)]
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lowercase: bool,
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/// Adds a line to the end of the file
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#[arg(long)]
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append: Option<String>,
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/// Write this string to stdout, and ignore stdin.
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#[arg(long)]
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stdout: Option<String>,
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/// Write this string to stderr.
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#[arg(long)]
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stderr: Option<String>,
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/// Duplicate stdout into this file.
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#[arg(long)]
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tee: Option<PathBuf>,
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}
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fn main() -> ExitCode {
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let args: Args = Args::parse();
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// Code formatters tend to print errors before printing the result.
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if let Some(data) = args.stderr {
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eprint!("{data}");
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}
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let stdout = if let Some(data) = args.stdout {
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// Other content-altering flags don't apply to --stdout.
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assert!(!args.reverse);
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assert!(!args.uppercase);
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assert!(!args.lowercase);
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assert!(args.append.is_none());
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data
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} else {
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let mut stdout = std::io::stdin()
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.lines()
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.map(|line| {
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format!("{}\n", {
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let line = if args.reverse {
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line.unwrap().chars().rev().collect()
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} else {
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line.unwrap()
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};
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if args.uppercase {
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assert!(!args.lowercase);
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line.to_uppercase()
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} else if args.lowercase {
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assert!(!args.uppercase);
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line.to_lowercase()
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} else {
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line
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}
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})
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})
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.join("");
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if let Some(line) = args.append {
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stdout.push_str(&line);
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}
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stdout
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};
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print!("{stdout}");
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if let Some(path) = args.tee {
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let mut file = OpenOptions::new()
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.create(true)
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.append(true)
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.open(path)
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.unwrap();
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write!(file, "{stdout}").unwrap();
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}
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if args.fail {
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ExitCode::FAILURE
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} else {
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ExitCode::SUCCESS
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}
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}
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