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use arg_picker::{IntoPicker, Pickable, PickerArg, value::Flag};
use mingling_core::{Program, ProgramCollect};
use crate::consts::REMAINS;
/// Picks a global flag from the program's arguments.
///
/// This function takes ownership of the program's current arguments, picks the specified `flag`
/// from them, and then returns the remaining arguments back to the program. It returns the
/// boolean value of the flag.
pub fn pick_global_flag<C>(program: &mut Program<C>, flag: &PickerArg<Flag>) -> bool
where
C: ProgramCollect<Enum = C>,
{
let args = program.take_args();
let (flag, args) = args.pick(flag).pick(&REMAINS).unwrap();
program.replace_args(args.into());
*flag
}
/// Picks a global argument from the program's arguments.
///
/// This function takes ownership of the program's current arguments, picks the specified `arg`
/// from them, and then returns the remaining arguments back to the program. It returns the
/// picked argument value, or `None` if the argument was not present.
pub fn pick_global_argument<C, A>(program: &mut Program<C>, arg: &PickerArg<A>) -> Option<A>
where
A: for<'a> Pickable<'a> + Default,
C: ProgramCollect<Enum = C>,
{
let args = program.take_args();
let (arg, remains) = args.pick(arg).pick(&REMAINS).unpack();
program.replace_args(remains.unwrap().into());
arg
}
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