1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124

use indexmap::IndexMap;
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
#[serde(untagged)]
enum Itch {
    Obj(IndexMap<String, Itch>),
    Array(Vec<Itch>),
    Bool(bool),
    Int(i64),
    Float(f64),
    Text(String),
}

pub enum FromType {
    Json,
    Toml,
    Url,
    Yaml,
    Xml,
}

impl std::str::FromStr for FromType {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "json" => Ok(Self::Json),
            "qs" => Ok(Self::Url),
            "toml" => Ok(Self::Toml),
            "url" => Ok(Self::Url),
            "xml" => Ok(Self::Xml),
            "yaml" => Ok(Self::Yaml),
            _ => Err(format!("could not parse `{}` as an input type", s)),
        }
    }
}

pub enum ToType {
    Json,
    Toml,
    Url,
    Yaml,
    Xml,
}

impl std::str::FromStr for ToType {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "json" => Ok(Self::Json),
            "qs" => Ok(Self::Url),
            "toml" => Ok(Self::Toml),
            "url" => Ok(Self::Url),
            "xml" => Ok(Self::Xml),
            "yaml" => Ok(Self::Yaml),
            _ => Err(format!("could not parse `{}` as an output type", s)),
        }
    }
}

pub fn convert<From: std::io::Read, To: std::io::Write>(
    from_type: &FromType,
    to_type: &ToType,
    mut input: From,
    mut output: To,
) -> Result<(), String> {
    let itch: Itch =
        match from_type {
            FromType::Json => serde_json::from_reader(input)
                .map_err(|e| format!("error parsing json: `{}`", e))?,

            FromType::Xml => serde_xml_rs::from_reader(input)
                .map_err(|e| format!("error parsing xml: `{}`", e))?,

            FromType::Yaml => serde_yaml::from_reader(input)
                .map_err(|e| format!("error parsing yaml: `{}`", e))?,

            FromType::Toml => {
                let mut s = String::new();
                input
                    .read_to_string(&mut s)
                    .map_err(|e| format!("error parsing toml: `{}`", e))?;
                toml::from_str(&s).map_err(|e| format!("error parsing toml: `{}`", e))?
            }

            FromType::Url => {
                let mut s = String::new();
                input
                    .read_to_string(&mut s)
                    .map_err(|e| format!("error parsing url query string: `{}`", e))?;
                serde_qs::from_str(&s)
                    .map_err(|e| format!("error parsing url query string: `{}`", e))?
            }
        };

    match to_type {
        ToType::Json => serde_json::to_writer(output, &itch).map_err(|e| {
            dbg!(&e);
            format!("error outputting json: `{}`", e)
        })?,

        ToType::Url => serde_qs::to_writer(&itch, &mut output)
            .map_err(|e| format!("error outputting url query string: `{}`", e))?,

        ToType::Xml => serde_xml_rs::to_writer(output, &itch)
            .map_err(|e| format!("error outputting xml: `{}`", e))?,

        ToType::Yaml => serde_yaml::to_writer(output, &itch)
            .map_err(|e| format!("error outputting yaml: `{}`", e))?,

        ToType::Toml => {
            let s = toml::to_string_pretty(&itch)
                .map_err(|e| format!("error outputting toml: `{}`", e))?;
            output
                .write(s.as_bytes())
                .map(|_| ())
                .map_err(|e| format!("error outputting toml: `{}`", e))?
        }
    };

    Ok(())
}