aopt 1.4.5

A flexible and typed getopt tools
Documentation 
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use std::ffi::OsString;

use crate::error;
use crate::map::Entry;
use crate::map::ErasedTy;
use crate::value::ErasedValue;
use crate::Error;

use super::Opt;

pub trait OptValueExt {
    fn val<T: ErasedTy>(&self) -> Result<&T, Error>;

    fn val_mut<T: ErasedTy>(&mut self) -> Result<&mut T, Error>;

    fn vals<T: ErasedTy>(&self) -> Result<&Vec<T>, Error>;

    fn vals_mut<T: ErasedTy>(&mut self) -> Result<&mut Vec<T>, Error>;

    fn take_val<T: ErasedTy>(&mut self) -> Result<T, Error>;

    fn take_vals<T: ErasedTy>(&mut self) -> Result<Vec<T>, Error>;

    fn entry<T: ErasedTy>(&mut self) -> Entry<'_, Vec<T>>;

    fn rawval(&self) -> Result<&OsString, Error>;

    fn rawval_mut(&mut self) -> Result<&mut OsString, Error>;

    fn rawvals(&self) -> Result<&Vec<OsString>, Error>;

    fn rawvals_mut(&mut self) -> Result<&mut Vec<OsString>, Error>;

    fn take_rawval<T: ErasedTy>(&mut self) -> Result<OsString, Error>;

    fn take_rawvals<T: ErasedTy>(&mut self) -> Result<Vec<OsString>, Error>;

    fn filter<T: ErasedTy>(&mut self, f: impl FnMut(&T) -> bool) -> Result<Vec<T>, Error>;
}

impl<O: Opt> OptValueExt for O {
    fn val<T: ErasedTy>(&self) -> Result<&T, Error> {
        let hint = self.hint();
        let act = self.action();
        let uid = self.uid();

        self.accessor().val().map_err(|e| {
            e.cause(error!("can not find value(ref) of `{hint}`({act})"))
                .with_uid(uid)
        })
    }

    fn val_mut<T: ErasedTy>(&mut self) -> Result<&mut T, Error> {
        let hint = self.hint();
        let act = self.action();
        let uid = self.uid();
        let err = error!("can not find value(mut) of `{}`({})", hint, act).with_uid(uid);

        self.accessor_mut().val_mut().map_err(|e| e.cause(err))
    }

    fn vals<T: ErasedTy>(&self) -> Result<&Vec<T>, Error> {
        let hint = self.hint();
        let act = self.action();
        let uid = self.uid();

        self.accessor().vals().map_err(|e| {
            e.cause(error!("can not find values(ref) of `{hint}`({act})"))
                .with_uid(uid)
        })
    }

    fn vals_mut<T: ErasedTy>(&mut self) -> Result<&mut Vec<T>, Error> {
        let hint = self.hint();
        let act = self.action();
        let uid = self.uid();
        let err = error!("can not find values(mut) of `{}`({})", hint, act).with_uid(uid);

        self.accessor_mut().vals_mut().map_err(|e| e.cause(err))
    }

    fn take_val<T: ErasedTy>(&mut self) -> Result<T, Error> {
        let hint = self.hint();
        let act = self.action();
        let uid = self.uid();
        let err = error!("can not take value of `{}`({})", hint, act).with_uid(uid);

        self.accessor_mut().take_val().map_err(|e| e.cause(err))
    }

    fn take_vals<T: ErasedTy>(&mut self) -> Result<Vec<T>, Error> {
        let hint = self.hint();
        let act = self.action();
        let uid = self.uid();
        let err = error!("can not take values of `{}`({})", hint, act).with_uid(uid);

        self.accessor_mut().take_vals().map_err(|e| e.cause(err))
    }

    fn entry<T: ErasedTy>(&mut self) -> Entry<'_, Vec<T>> {
        self.accessor_mut().entry::<T>()
    }

    fn rawval(&self) -> Result<&OsString, Error> {
        let hint = self.hint();
        let uid = self.uid();

        self.accessor().rawval().map_err(|e| {
            e.cause(error!("can not find raw value(ref) of `{hint}`",))
                .with_uid(uid)
        })
    }

    fn rawval_mut(&mut self) -> Result<&mut OsString, Error> {
        let hint = self.hint();
        let uid = self.uid();
        let err = error!("can not find raw value(mut) of `{}`", hint).with_uid(uid);

        self.accessor_mut().rawval_mut().map_err(|e| e.cause(err))
    }

    fn rawvals(&self) -> Result<&Vec<OsString>, Error> {
        let hint = self.hint();

        self.accessor()
            .rawvals()
            .map_err(|e| e.cause(error!("can not find raw values(ref) of `{hint}`",)))
    }

    fn rawvals_mut(&mut self) -> Result<&mut Vec<OsString>, Error> {
        let hint = self.hint();
        let uid = self.uid();
        let err = error!("can not find raw values(mut) of `{}`", hint).with_uid(uid);

        self.accessor_mut().rawvals_mut().map_err(|e| e.cause(err))
    }

    fn take_rawval<T: ErasedTy>(&mut self) -> Result<OsString, Error> {
        let hint = self.hint();
        let uid = self.uid();
        let err = error!("can not take raw value of `{}`", hint).with_uid(uid);

        self.accessor_mut().take_val().map_err(|e| e.cause(err))
    }

    fn take_rawvals<T: ErasedTy>(&mut self) -> Result<Vec<OsString>, Error> {
        let hint = self.hint();
        let uid = self.uid();
        let err = error!("can not take raw values of `{}`", hint).with_uid(uid);

        self.accessor_mut().take_vals().map_err(|e| e.cause(err))
    }

    /// Filter the value from option values if `f` return true.
    fn filter<T: ErasedTy>(&mut self, mut f: impl FnMut(&T) -> bool) -> Result<Vec<T>, Error> {
        let vals = self.vals_mut::<T>()?;
        let mut i = 0;
        let mut removed = vec![];

        while i < vals.len() {
            if (f)(&vals[i]) {
                removed.push(vals.remove(i));
            } else {
                i += 1;
            }
        }
        Ok(removed)
    }
}