use std::{borrow::Cow, convert::TryFrom, fmt::Display, str::FromStr}; use bstr::{BStr, BString}; use crate::{Error, Integer}; impl Integer {    /// Canonicalize values as simple decimal numbers.    /// An optional suffix of k, m, or g (case-insensitive), will cause the    /// value to be multiplied by 1024 (k), 1048576 (m), or 1073741824 (g) respectively.    ///    /// Returns the result if there is no multiplication overflow.    pub fn to_decimal(&self) -> Option<i64> {        match self.suffix {            None => Some(self.value),            Some(suffix) => match suffix {                Suffix::Kibi => self.value.checked_mul(1024),                Suffix::Mebi => self.value.checked_mul(1024 * 1024),                Suffix::Gibi => self.value.checked_mul(1024 * 1024 * 1024),            },        }    }} impl Display for Integer {    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {        write!(f, "{}", self.value)?;        if let Some(suffix) = self.suffix {            write!(f, "{suffix}")        } else {            Ok(())        }    }} #[cfg(feature = "serde")]impl serde::Serialize for Integer {    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>    where        S: serde::Serializer,    {        if let Some(suffix) = self.suffix {            serializer.serialize_i64(self.value << suffix.bitwise_offset())        } else {            serializer.serialize_i64(self.value)        }    }} fn int_err(input: impl Into<BString>) -> Error {    Error::new(        "Integers needs to be positive or negative numbers which may have a suffix like 1k, 42, or 50G",        input,    )} impl TryFrom<&BStr> for Integer {    type Error = Error;     fn try_from(s: &BStr) -> Result<Self, Self::Error> {        let s = std::str::from_utf8(s).map_err(|err| int_err(s).with_err(err))?;        if let Ok(value) = s.parse() {            return Ok(Self { value, suffix: None });        }         if s.len() <= 1 {            return Err(int_err(s));        }         let (number, suffix) = s.split_at(s.len() - 1);        if let (Ok(value), Ok(suffix)) = (number.parse(), suffix.parse()) {            Ok(Self {                value,                suffix: Some(suffix),            })        } else {            Err(int_err(s))        }    }} impl TryFrom<Cow<'_, BStr>> for Integer {    type Error = Error;     fn try_from(c: Cow<'_, BStr>) -> Result<Self, Self::Error> {        Self::try_from(c.as_ref())    }} /// Integer suffixes that are supported by `git-config`.////// These values are base-2 unit of measurements, not the base-10 variants.#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]#[allow(missing_docs)]pub enum Suffix {    Kibi,    Mebi,    Gibi,} impl Suffix {    /// Returns the number of bits that the suffix shifts left by.    #[must_use]    pub const fn bitwise_offset(self) -> usize {        match self {            Self::Kibi => 10,            Self::Mebi => 20,            Self::Gibi => 30,        }    }} impl Display for Suffix {    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {        match self {            Self::Kibi => write!(f, "k"),            Self::Mebi => write!(f, "m"),            Self::Gibi => write!(f, "g"),        }    }} #[cfg(feature = "serde")]impl serde::Serialize for Suffix {    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>    where        S: serde::Serializer,    {        serializer.serialize_str(match self {            Self::Kibi => "k",            Self::Mebi => "m",            Self::Gibi => "g",        })    }} impl FromStr for Suffix {    type Err = ();     fn from_str(s: &str) -> Result<Self, Self::Err> {        match s {            "k" | "K" => Ok(Self::Kibi),            "m" | "M" => Ok(Self::Mebi),            "g" | "G" => Ok(Self::Gibi),            _ => Err(()),        }    }} impl TryFrom<&BStr> for Suffix {    type Error = ();     fn try_from(s: &BStr) -> Result<Self, Self::Error> {        Self::from_str(std::str::from_utf8(s).map_err(|_| ())?)    }}