optionable_codegen 0.2.0

proc_macro2 functions for the derive macro and codegen implementations in the `optionable_derive` crate to derive nested structs/enums with all subfields being optional (e.g. for patches or Kubernetes server side apply).
Documentation 
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use assert_cmd::assert::OutputAssertExt;
use assert_cmd::Command;
use std::path::{Path, PathBuf};
use std::{fs, io};
use tempfile::TempDir;

#[test]
fn simple() {
    test("example/input/src/lib.rs", "example/simple", &vec![]);
}

#[test]
fn no_convert() {
    test(
        "example/input/src/lib.rs",
        "example/no_convert",
        &vec!["--no-convert"],
    );
}

#[test]
fn extra_derives() {
    test(
        "example/input/src/lib.rs",
        "example/extra_derives",
        &vec!["-d", "serde::Serialize", "-d", "serde::Deserialize"],
    );
}

/// Implementation of the core integration test for the codegen.
/// Checks that the codegen returns without errors and verifies that the
/// expected output in the output directory is generated (into a temp directory).
fn test(input_file: &str, expected_output_path: &str, extra_args: &Vec<&str>) {
    let temp_dir = TempDir::new().unwrap();
    let mut args = vec![
        input_file.to_owned(),
        temp_dir.path().to_str().unwrap().to_owned(),
    ];
    let mut extra_args = extra_args
        .iter()
        .map(ToString::to_string)
        .collect::<Vec<_>>();
    args.append(&mut extra_args);
    let cmd = Command::cargo_bin("codegen").unwrap().args(args).unwrap();
    cmd.assert().success();
    assert!(dirs_contained(&expected_output_path.into(), temp_dir.path()).unwrap());
}

/// Checks whether the file content of all files in the input directory are contained in the others directory.
fn dirs_contained(input: &PathBuf, other: &Path) -> Result<bool, io::Error> {
    let files_input = fs::read_dir(input)?
        .map(|file| {
            let file = file?;
            let file_type = file.file_type()?;
            Ok::<_, io::Error>((file, file_type))
        })
        .collect::<Result<Vec<_>, _>>()?;
    if !files_input
        .iter()
        .filter(|&(_, file_type)| file_type.is_dir())
        .map(|(f, _)| dirs_contained(&input.join(f.file_name()), &other.join(f.file_name())))
        .collect::<Result<Vec<_>, _>>()?
        .into_iter()
        .all(|el| el)
    {
        return Ok(false);
    }
    let files_input = files_input
        .into_iter()
        .filter(|&(_, file_type)| file_type.is_file());
    for (file_input, _) in files_input {
        let data_input = fs::read(file_input.path())?;
        let data_other = fs::read(other.join(file_input.file_name()))?;
        if data_input != data_other {
            return Ok(false);
        }
    }
    Ok(true)
}