serde_any 0.5.0

Dynamic serialization and deserialization with the format chosen at runtime
Documentation 
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extern crate serde;
extern crate serde_any;
extern crate serde_value;

#[macro_use]
extern crate structopt;

extern crate failure;

use structopt::StructOpt;

use std::path::PathBuf;

#[derive(StructOpt, Clone, Debug)]
struct Opt {
    #[structopt(short = "i", long = "input", parse(from_os_str))]
    input: PathBuf,
    #[structopt(short = "o", long = "output", parse(from_os_str))]
    output: PathBuf,
    #[structopt(short = "p", long = "pretty")]
    pretty: bool,
}

//
// A program that will "transcode" a House object between different
// serialization formats.
//
// The user can specify `input` and `output` paths with any supported file
// extension, and the program will use it to choose the deserialization and
// serialization format.
//
// For example, `transcode -i house.toml -o house.json` will convert it from
// TOML to JSON.
//

fn main() -> Result<(), failure::Error> {
    let opt = Opt::from_args();

    println!(
        "Transcoding from '{}' to '{}'",
        opt.input.display(),
        opt.output.display()
    );

    // Reads a Value from the given input file.
    // The format is chosen according to the file extension if possible,
    // otherwise all supported formats are attempted
    let value: serde_value::Value = serde_any::from_file(&opt.input)?;

    // Writes the Value to the given output file,
    // with the format chosen according to the file extension.
    if opt.pretty {
        serde_any::to_file_pretty(&opt.output, &value)?;
    } else {
        serde_any::to_file(&opt.output, &value)?;
    }

    Ok(())
}