from-json.rs

use std::fs::File;

use nu_errors::ShellError;
use nu_plugin::{serve_plugin, Plugin};
use nu_protocol::{CallInfo, ReturnValue, Signature, SyntaxShape};

struct FromJson;

impl Plugin for FromJson {
    fn config(&mut self) -> Result<Signature, ShellError> {
        Ok(Signature::build("bad-from-json")
            .required("path", SyntaxShape::String, "json file path")
            .filter())
    }

    fn begin_filter(&mut self, info: CallInfo) -> Result<Vec<ReturnValue>, ShellError> {
        let arg = info.args.expect_nth(0)?.expect_string();
        let mut f = File::open(arg).unwrap();
        let value: serde_json::Value = serde_json::from_reader(&mut f).unwrap();
        let values = serde_nu::to_success_return_values(vec![value]).unwrap();
        Ok(values)
    }
}

fn main() {
    serve_plugin(&mut FromJson);
}