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use clap::Parser;
use comfy_table::{ContentArrangement, Row, Table};
use std::fmt;
trait DisplayType<X> {
fn next_fmt(&self, x: &X) -> Option<String>;
fn fmt(&self, x: &X) -> String;
fn display(&self, x: &X) -> String {
self.next_fmt(x).unwrap_or_else(|| self.fmt(x))
}
}
trait ToTable {
fn to_table(&self) -> Table;
}
#[derive(Parser)]
struct NoDisplay {}
impl<X> DisplayType<X> for NoDisplay {
fn next_fmt(&self, _: &X) -> Option<String> {
None
}
fn fmt(&self, _: &X) -> String {
String::new()
}
}
#[derive(Parser)]
struct TextDisplay<T: clap::Args> {
/// Display as text
#[clap(long, group = "fmt_type")]
text: bool,
#[clap(flatten)]
next: T,
}
impl<X, T> DisplayType<X> for TextDisplay<T>
where
X: fmt::Display,
T: DisplayType<X> + clap::Args,
{
fn next_fmt(&self, x: &X) -> Option<String> {
self.text
.then(|| self.fmt(x))
.or_else(|| self.next.next_fmt(x))
}
fn fmt(&self, x: &X) -> String {
format!("{x}")
}
}
#[derive(Parser)]
struct DebugDisplay<T: clap::Args> {
/// Display as internal debug representation
#[clap(long, group = "fmt_type")]
debug: bool,
#[clap(flatten)]
next: T,
}
impl<X, T> DisplayType<X> for DebugDisplay<T>
where
X: fmt::Debug,
T: DisplayType<X> + clap::Args,
{
fn next_fmt(&self, x: &X) -> Option<String> {
self.debug
.then(|| self.fmt(x))
.or_else(|| self.next.next_fmt(x))
}
fn fmt(&self, x: &X) -> String {
format!("{x:?}")
}
}
#[derive(Parser)]
struct ApiDisplay<T: clap::Args> {
/// Display as unformatted JSON
#[clap(long, group = "fmt_type")]
api: bool,
#[clap(flatten)]
next: T,
}
impl<X, T> DisplayType<X> for ApiDisplay<T>
where
X: serde::Serialize,
T: DisplayType<X> + clap::Args,
{
fn next_fmt(&self, x: &X) -> Option<String> {
self.api
.then(|| self.fmt(x))
.or_else(|| self.next.next_fmt(x))
}
fn fmt(&self, x: &X) -> String {
serde_json::to_string(x).expect("Cannot serialize item to JSON")
}
}
#[derive(Parser)]
struct JsonDisplay<T: clap::Args> {
/// Display as pretty formatted JSON
#[clap(long, group = "fmt_type")]
json: bool,
#[clap(flatten)]
next: T,
}
impl<X, T> DisplayType<X> for JsonDisplay<T>
where
X: serde::Serialize,
T: DisplayType<X> + clap::Args,
{
fn next_fmt(&self, x: &X) -> Option<String> {
self.json
.then(|| self.fmt(x))
.or_else(|| self.next.next_fmt(x))
}
fn fmt(&self, x: &X) -> String {
serde_json::to_string_pretty(x).expect("Cannot serialize item to JSON")
}
}
#[derive(Parser)]
struct YamlDisplay<T: clap::Args> {
/// Display as YAML
#[clap(long, group = "fmt_type")]
yaml: bool,
#[clap(flatten)]
next: T,
}
impl<X, T> DisplayType<X> for YamlDisplay<T>
where
X: serde::Serialize,
T: DisplayType<X> + clap::Args,
{
fn next_fmt(&self, x: &X) -> Option<String> {
self.yaml
.then(|| self.fmt(x))
.or_else(|| self.next.next_fmt(x))
}
fn fmt(&self, x: &X) -> String {
serde_yaml::to_string(x).expect("Cannot serialize item to YAML")
}
}
#[derive(Parser)]
struct TableDisplay<T: clap::Args> {
/// Display as table
#[clap(long, group = "fmt_type", alias = "tabular")]
table: bool,
#[clap(flatten)]
next: T,
}
impl<X, T> DisplayType<X> for TableDisplay<T>
where
X: ToTable,
T: DisplayType<X> + clap::Args,
{
fn next_fmt(&self, x: &X) -> Option<String> {
self.table
.then(|| self.fmt(x))
.or_else(|| self.next.next_fmt(x))
}
fn fmt(&self, x: &X) -> String {
x.to_table().to_string()
}
}
#[derive(Parser)]
enum App {
/// Debug output by default
Debug {
#[clap(flatten)]
output: DebugDisplay<TextDisplay<ApiDisplay<NoDisplay>>>,
},
/// Text output by default
Text {
#[clap(flatten)]
output: TextDisplay<DebugDisplay<ApiDisplay<NoDisplay>>>,
},
/// Unformatted JSON output by default
Api {
#[clap(flatten)]
output: ApiDisplay<TextDisplay<DebugDisplay<NoDisplay>>>,
},
/// Pretty formatted JSON output by default
Json {
#[clap(flatten)]
output: JsonDisplay<ApiDisplay<TextDisplay<DebugDisplay<NoDisplay>>>>,
},
/// YAML output by default
Yaml {
#[clap(flatten)]
output: YamlDisplay<JsonDisplay<ApiDisplay<TextDisplay<DebugDisplay<NoDisplay>>>>>,
},
/// Table output by default
Table {
#[clap(flatten)]
output: TableDisplay<
YamlDisplay<JsonDisplay<ApiDisplay<TextDisplay<DebugDisplay<NoDisplay>>>>>,
>,
},
}
#[derive(Debug, serde::Serialize)]
struct Foo {
name: String,
value: String,
}
impl fmt::Display for Foo {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}={}", self.name, self.value)
}
}
impl ToTable for Foo {
fn to_table(&self) -> Table {
let mut table = Table::new();
table
.set_content_arrangement(ContentArrangement::Dynamic)
.set_header(Row::from(vec!["Name", "Value"]))
.add_row(Row::from(vec![&self.name, &self.value]));
table
}
}
fn main() {
let app = App::parse();
let foo = Foo {
name: "Hello".to_string(),
value: "world".to_string(),
};
match app {
App::Debug { output } => println!("{}", output.display(&foo)),
App::Text { output } => println!("{}", output.display(&foo)),
App::Api { output } => println!("{}", output.display(&foo)),
App::Json { output } => println!("{}", output.display(&foo)),
App::Yaml { output } => println!("{}", output.display(&foo)),
App::Table { output } => println!("{}", output.display(&foo)),
}
}
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