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//! Example Argument Parse
//!
//! > This example demonstrates how to use the `parser` feature to parse user input
//!
//! Run:
//! ```bash
//! cargo run --manifest-path examples/example-argument-parse/Cargo.toml --quiet -- transfer README.md --size 32kib
//! cargo run --manifest-path examples/example-argument-parse/Cargo.toml --quiet -- transfer src/ --dir
//! cargo run --manifest-path examples/example-argument-parse/Cargo.toml --quiet -- strict-transfer README.md
//! cargo run --manifest-path examples/example-argument-parse/Cargo.toml --quiet -- strict-transfer --dir
//! ```
//!
//! Output:
//! ```plaintext
//! file: README.md (32768)
//! dir: src/ (1048576)
//! file: README.md (1048576)
//! Error: name is not provided
//! ```
use mingling::{macros::route, prelude::*};
dispatcher!("transfer", CMDTransfer => EntryTransfer);
dispatcher!("strict-transfer", CMDStrictTransfer => EntryStrictTransfer);
pack!(ResultFile = (bool, usize, String)); // (IsDir, Size, Name)
#[chain]
fn handle_transfer_parse(args: EntryTransfer) -> Next {
// --------- IMPORTANT ---------
// First parse flag arguments (like --dir/-D), then positional arguments
let result: ResultFile = args
// Name --dir --size 20mib
// ^^^^^^^^^^^^_ first
.pick::<bool>(["--dir", "-D"])
// Name --dir
// ^^^^^_ second (or `-D`)
.pick_or::<usize>("--size", 1024 * 1024_usize)
// Name
// ^^^^_ finally, pick positional arg
.pick::<String>(())
.after(|str| str.trim().replace(' ', ""))
// Unpack to tuple (is_dir, size, name)
.unpack()
// Convert into ResultFile
.into();
// --------- IMPORTANT ---------
result
}
pack!(ErrorNoNameProvided = ());
#[chain]
fn handle_strict_transfer_parse(args: EntryStrictTransfer) -> Next {
// --------- IMPORTANT ---------
// Strict parsing: error immediately if the name is not provided
let result: ResultFile = route! { // Use `route!` to wrap a Picker that contains `or_route`
args
.pick::<bool>(["--dir", "-D"])
.pick_or::<usize>("--size", 1024 * 1024_usize)
// Finally parse the positional argument; if not found, route to `ErrorNoNameProvided`
.pick_or_route::<String, _>((), ErrorNoNameProvided::default().to_chain())
.after(|str| str.trim().replace(' ', ""))
.unpack()
}
// Convert into ResultFile
.into();
// --------- IMPORTANT ---------
result.to_chain()
}
/// Renders the parsed transfer result (file/dir, size, name).
#[renderer]
fn render_result_file(result: ResultFile) {
let (is_dir, size, name) = result.into();
r_println!(
"{}: {} ({})",
if is_dir { "dir" } else { "file" },
name,
size
)
}
/// Renders the error when no name is provided.
#[renderer]
fn render_error_no_name_provided(_: ErrorNoNameProvided) {
r_println!("Error: name is not provided")
}
gen_program!();
fn main() {
let mut program = ThisProgram::new();
program.with_dispatcher(CMDTransfer);
program.with_dispatcher(CMDStrictTransfer);
program.exec_and_exit();
}
|
