hawk-cli 0.1.4

Dead simple cli to ease github workflows management in monorepos
Documentation 
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use serde::{de, Serialize};
use std::{fmt, fs, io, path::Path};

pub type Result<T> = std::result::Result<T, FileError>;

#[derive(Debug, Clone)]
struct PackageJsonError;

#[derive(Debug, Clone)]
pub enum FileKind {
    JSON,
    YAML,
}

impl FileKind {
    pub fn from_path(p: &Path) -> std::result::Result<FileKind, FileError> {
        if !p.is_file() || p.extension().is_none() {
            return Err(FileError::UnsupportedExtension);
        }

        match p.extension().unwrap().to_str().unwrap() {
            "json" => Ok(FileKind::JSON),
            "yml" | "yaml" => Ok(FileKind::YAML),
            _ => Err(FileError::UnsupportedExtension),
        }
    }
}

pub trait File<T>
where
    T: de::DeserializeOwned,
{
    /// Reads file from filesystem. It must be json or yaml.
    fn load(path: &Path) -> Result<T> {
        let r = fs::File::open(path)?;
        let kind = FileKind::from_path(path)?;

        match kind {
            FileKind::JSON => match serde_json::from_reader(r) {
                Ok(d) => Ok(d),
                Err(e) => Err(FileError::from(e)),
            },
            FileKind::YAML => match serde_yaml::from_reader(r) {
                Ok(d) => Ok(d),
                Err(e) => Err(FileError::from(e)),
            },
        }
    }

    fn write(&self, path: &Path) -> Result<()>
    where
        Self: Serialize,
    {
        let r = fs::File::create(path)?;
        let kind = FileKind::from_path(path)?;

        match kind {
            FileKind::JSON => serde_json::to_writer_pretty(r, self)?,
            FileKind::YAML => serde_yaml::to_writer(r, self)?,
        }

        Ok(())
    }
}

#[derive(Debug)]
pub enum FileError {
    NotFound,
    UnsupportedExtension,
    InvalidYAMLSyntax(serde_yaml::Error),
    InvalidJSONSyntax(serde_json::Error),
    IO(io::Error),
}

impl fmt::Display for FileError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let message: String = match self {
            FileError::NotFound => "No such file or directory".into(),
            FileError::UnsupportedExtension => {
                "unsupported file extension (allowed: yaml | yml | json)".into()
            }
            FileError::InvalidYAMLSyntax(err) => format!("Invalid YAML syntax: {:?}", err),
            FileError::InvalidJSONSyntax(err) => format!("Invalid JSON syntax: {:?}", err),
            FileError::IO(err) => format!("{}", err),
        };

        write!(f, "{}", message)
    }
}

impl From<serde_json::Error> for FileError {
    fn from(e: serde_json::Error) -> Self {
        FileError::InvalidJSONSyntax(e)
    }
}

impl From<serde_yaml::Error> for FileError {
    fn from(e: serde_yaml::Error) -> Self {
        FileError::InvalidYAMLSyntax(e)
    }
}

impl From<io::Error> for FileError {
    fn from(e: io::Error) -> Self {
        match e.kind() {
            io::ErrorKind::NotFound => FileError::NotFound,
            _ => FileError::IO(e),
        }
    }
}