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Introduce parse_slice that allows value borrowing. Technically this works, but I am happy with precisely NONE of it.

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a dinosaur
2025-11-18 15:59:05 +11:00
parent afffd1ef91
commit 40cdb24004
4 changed files with 163 additions and 36 deletions
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17
jaarg-nostd/examples/basic_nostd.rs
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@@ -6,8 +6,6 @@
#![no_std]
#![no_main]
extern crate alloc;
use jaarg::{
ErrorUsageWriter, ErrorUsageWriterContext, HelpWriter, HelpWriterContext, Opt, Opts,
ParseControl, ParseResult, StandardErrorUsageWriter, StandardFullHelpWriter
@@ -18,8 +16,8 @@ use jaarg_nostd::{print, println, harness::ExitCode, simplepathbuf::SimplePathBu
#[allow(improper_ctypes_definitions)]
extern "C" fn safe_main(args: &[&str]) -> ExitCode {
// Variables for arguments to fill
let mut file = SimplePathBuf::default();
let mut out: Option<SimplePathBuf> = None;
let mut file: Option<&str> = None;
let mut out: Option<&str> = None;
let mut number = 0;
// Set up arguments table
@@ -35,9 +33,9 @@ extern "C" fn safe_main(args: &[&str]) -> ExitCode {
]).with_description("My simple utility.");
// Parse command-line arguments from argv
match OPTIONS.parse(
match OPTIONS.parse_slice(
SimplePathBuf::from(*args.first().unwrap()).basename(),
args.iter().skip(1), |ctx| {
&args[1..], |ctx| {
match ctx.id {
Arg::Help => {
let ctx = HelpWriterContext { options: &OPTIONS, program_name: ctx.program_name };
@@ -45,8 +43,8 @@ extern "C" fn safe_main(args: &[&str]) -> ExitCode {
return Ok(ParseControl::Quit);
}
Arg::Number => { number = str::parse(ctx.arg.unwrap())?; }
Arg::File => { file = ctx.arg.unwrap().into(); }
Arg::Out => { out = Some(ctx.arg.unwrap().into()); }
Arg::File => { file = ctx.arg; }
Arg::Out => { out = ctx.arg; }
}
Ok(ParseControl::Continue)
}, |program_name, error| {
@@ -60,8 +58,9 @@ extern "C" fn safe_main(args: &[&str]) -> ExitCode {
}
// Print the result variables
let file = SimplePathBuf::from(file.unwrap());
println!("{file} -> {out} (number: {number})",
out = out.unwrap_or(file.with_extension("out")));
out = out.map_or(file.with_extension("out"), |out| SimplePathBuf::from(out)));
ExitCode::SUCCESS
}