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parent
98a3ef9a47
commit
5bc0c302f3
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use std::fmt::Display;
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Unit {
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Byte,
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Kilo,
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Kibi,
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Mega,
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Mibi,
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Giga,
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Gibi,
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Tera,
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Tibi,
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}
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impl Unit {
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pub fn parse(s: &str) -> Result<Self, String> {
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let s = s.to_lowercase();
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match s.as_str() {
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"b" => Ok(Self::Byte),
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"k" | "kb" => Ok(Self::Kilo),
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"ki" => Ok(Self::Kibi),
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"m" | "mb" => Ok(Self::Mega),
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"mi" => Ok(Self::Mibi),
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"g" | "gb" => Ok(Self::Giga),
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"gi" => Ok(Self::Gibi),
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"t" | "tb" => Ok(Self::Tera),
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"ti" => Ok(Self::Tibi),
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_ => Err(s),
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}
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}
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pub fn convert(self, n: u64) -> String {
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format!("{}{}", n/self.integer_value(), self.units_pretty())
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}
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const fn units_pretty(self) -> &'static str {
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match self {
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Self::Byte => "",
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Self::Kilo => " K",
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Self::Kibi => " Ki",
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Self::Mega => " M",
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Self::Mibi => " Mi",
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Self::Giga => " G",
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Self::Gibi => " Gi",
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Self::Tera => " T",
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Self::Tibi => " Ti",
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}
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}
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const fn integer_value(self) -> u64 {
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match self {
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Self::Byte => 1,
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Self::Kilo => 1_000,
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Self::Kibi => 1_024,
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Self::Mega => 1_000_000,
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Self::Mibi => 1_048_576,
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Self::Giga => 1_000_000_000,
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Self::Gibi => 1_073_741_824,
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Self::Tera => 1_000_000_000_000,
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Self::Tibi => 1_099_511_627_776,
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}
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}
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}
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impl Display for Unit {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let s = match self {
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Self::Byte => "b",
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Self::Kilo => "K",
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Self::Kibi => "Ki",
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Self::Mega => "M",
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Self::Mibi => "Mi",
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Self::Giga => "G",
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Self::Gibi => "Gi",
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Self::Tera => "T",
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Self::Tibi => "Ti",
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};
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f.write_str(s)
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}
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}
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