bvm 0.0.20

Proof of concept
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use dprint_cli_core::checksums::{parse_checksum_path_or_url, ChecksumPathOrUrl};
use dprint_cli_core::types::ErrBox;
use jsonc_parser::{parse_to_value, JsonValue};

pub struct ConfigFile {
    pub pre_install: Option<String>,
    pub post_install: Option<String>,
    pub binaries: Vec<ChecksumPathOrUrl>,
}

pub fn read_config_file(file_text: &str) -> Result<ConfigFile, ErrBox> {
    let value = parse_to_value(file_text)?;
    let mut root_object_node = match value {
        Some(JsonValue::Object(obj)) => obj,
        _ => return err!("Expected a root object in the json"),
    };

    let json_binaries = match root_object_node.take_array("binaries") {
        Some(json_binaries) => json_binaries,
        None => return err!("Expected to find a 'binaries' array."),
    };

    let mut binaries = Vec::new();
    for value in json_binaries.into_iter() {
        let url = match value {
            JsonValue::String(text) => parse_checksum_path_or_url(&text),
            _ => return err!("Expected a string for all items in 'binaries' array."),
        };
        binaries.push(url);
    }

    let pre_install = root_object_node.take_string("preInstall");
    let post_install = root_object_node.take_string("postInstall");

    for (key, _) in root_object_node.into_iter() {
        return err!("Unknown key in configuration file: {}", key);
    }

    Ok(ConfigFile {
        binaries,
        pre_install,
        post_install,
    })
}