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|
//! Example Error Handling
//!
//! > This example demonstrates how to handle errors in Mingling, including custom error types and error rendering.
//!
//! Run:
//! ```bash
//! cargo run --manifest-path examples/example-exitcode/Cargo.toml --quiet -- hello Alice
//! cargo run --manifest-path examples/example-exitcode/Cargo.toml --quiet -- hello
//! ```
//!
//! Output:
//! ```plaintext
//! Hello, Alice
//! No name provided (with exit code 1)
//! ```
use mingling::{
macros::help,
prelude::*,
res::ResExitCode,
setup::{BasicProgramSetup, ExitCodeSetup},
};
use std::io::Write;
fn main() {
let mut program = ThisProgram::new();
program.with_setup(BasicProgramSetup);
// --------- IMPORTANT ---------
// Register `ExitCodeSetup` for the program to enable exit codes
program.with_setup(ExitCodeSetup::default());
// --------- IMPORTANT ---------
program.with_dispatcher(CMDHello);
program.exec_and_exit();
}
dispatcher!("hello", CMDHello => EntryHello);
pack!(ErrorNoNameProvided = ());
pack!(ResultName = String);
#[chain]
fn handle_hello(args: EntryHello) -> Next {
let Some(name) = args.inner.first().cloned() else {
// If no name is provided, pass ErrorNoNameProvided
return ErrorNoNameProvided::default().to_render();
};
// If the name is valid, pass ResultName
ResultName::new(name).to_render()
}
/// Renders a successful greeting with the given name.
#[renderer]
fn render_result_name(name: ResultName) -> RenderResult {
let mut result = RenderResult::new();
writeln!(result, "Hello, {}", *name).ok();
result
}
#[help]
fn help_hello(_p: EntryHello, ec: &mut ResExitCode) -> RenderResult {
let mut result = RenderResult::new();
writeln!(result, "Usage: hello <NAME>").ok();
ec.exit_code = 2;
result
}
// Define renderer, render error message _______________ Inject exit code resource
// /
/// Renders the error when no name is provided |
#[renderer] // vvvvvvvvvvvvvvvv
fn render_error_no_name_provided(_: ErrorNoNameProvided, ec: &mut ResExitCode) -> RenderResult {
ec.exit_code = 1;
let mut result = RenderResult::new();
// Prompt when no name is provided
writeln!(result, "No name provided (with exit code 1)").ok();
result
}
gen_program!();
|
