jj/cli/testing/fake-editor.rs

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// Copyright 2022 The Jujutsu Authors
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//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::path::PathBuf;
use std::process::exit;
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use std::{env, fs};
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use clap::Parser;
use itertools::Itertools;
/// A fake editor, useful for testing
// It's overkill to use clap for a single argument, but we already use it in many other places...
#[derive(Parser, Debug)]
#[clap()]
struct Args {
/// Path to the file to edit
file: PathBuf,
}
fn main() {
let args: Args = Args::parse();
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let edit_script_path = PathBuf::from(env::var_os("EDIT_SCRIPT").unwrap());
let edit_script = fs::read_to_string(&edit_script_path).unwrap();
let mut instructions = edit_script.split('\0').collect_vec();
if let Some(pos) = instructions.iter().position(|&i| i == "next invocation\n") {
// Overwrite the edit script. The next time `fake-editor` is called, it will
// only see the part after the `next invocation` command.
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fs::write(&edit_script_path, instructions[pos + 1..].join("\0")).unwrap();
instructions.truncate(pos);
}
for instruction in instructions {
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let (command, payload) = instruction.split_once('\n').unwrap_or((instruction, ""));
let parts = command.split(' ').collect_vec();
match parts.as_slice() {
[""] => {}
["fail"] => exit(1),
["dump", dest] => {
let dest_path = edit_script_path.parent().unwrap().join(dest);
fs::copy(&args.file, dest_path).unwrap();
}
["expect"] => {
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let actual = String::from_utf8(fs::read(&args.file).unwrap()).unwrap();
if actual != payload {
eprintln!("fake-editor: Unexpected content.\n");
eprintln!("EXPECTED: <{payload}>\nRECEIVED: <{actual}>");
exit(1)
}
}
["expectpath"] => {
let actual = args.file.to_str().unwrap();
if actual != payload {
eprintln!("fake-editor: Unexpected path.\n");
eprintln!("EXPECTED: <{payload}>\nRECEIVED: <{actual}>");
exit(1)
}
}
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["write"] => {
fs::write(&args.file, payload).unwrap_or_else(|_| {
panic!("Failed to write file {}", args.file.to_str().unwrap())
});
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}
_ => {
eprintln!("fake-editor: unexpected command: {command}");
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exit(1)
}
}
}
}