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use chrono::Duration; use std::fmt; pub trait ChronoHumanDuration { type Displayer: fmt::Display; fn format_human(&self) -> Self::Displayer; } impl ChronoHumanDuration for Duration { type Displayer = Displayer; fn format_human(&self) -> Self::Displayer { Displayer { d: *self } } } pub struct Displayer { d: Duration, } impl fmt::Display for Displayer { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { let mut wrote = false; let d = self.d; let months = d.num_weeks() / 4; if months > 0 { write!(f, "{} month{}", months, if months > 1 { "s" } else { "" })?; wrote = true; } else { let weeks = d.num_weeks(); if weeks > 0 { write!( f, "{}{} week{}", if wrote { ", " } else { "" }, weeks, if weeks > 1 { "s" } else { "" } )?; wrote = true; } else { let days = d.num_days(); if days > 0 { write!( f, "{}{} day{}", if wrote { ", " } else { "" }, days, if days > 1 { "s" } else { "" } )?; wrote = true; } else { let hours = d.num_hours(); if hours > 0 { write!( f, "{}{} hour{}", if wrote { ", " } else { "" }, hours, if hours > 1 { "s" } else { "" } )?; wrote = true; } else { let minutes = d.num_minutes(); if minutes > 0 { write!( f, "{}{} minute{}", if wrote { ", " } else { "" }, minutes, if minutes > 1 { "s" } else { "" } )?; wrote = true; } } } } } if wrote { write!(f, " ago") } else { write!(f, "just now") } } } #[cfg(test)] mod tests { use super::ChronoHumanDuration; use chrono::Duration; #[test] fn it_works() { let d = Duration::weeks(2) + Duration::days(3) + Duration::hours(2) + Duration::minutes(20); assert_eq!(d.format_human().to_string(), "2 weeks ago"); let d = Duration::weeks(1); assert_eq!(d.format_human().to_string(), "1 week ago"); let d = Duration::days(2) + Duration::hours(2); assert_eq!(d.format_human().to_string(), "2 days ago"); let d = Duration::days(1); assert_eq!(d.format_human().to_string(), "1 day ago"); let d = Duration::hours(2); assert_eq!(d.format_human().to_string(), "2 hours ago"); let d = Duration::hours(1); assert_eq!(d.format_human().to_string(), "1 hour ago"); let d = Duration::minutes(2); assert_eq!(d.format_human().to_string(), "2 minutes ago"); let d = Duration::minutes(1); assert_eq!(d.format_human().to_string(), "1 minute ago"); let d = Duration::seconds(60); assert_eq!(d.format_human().to_string(), "1 minute ago"); let d = Duration::seconds(59); assert_eq!(d.format_human().to_string(), "just now"); let d = Duration::seconds(1); assert_eq!(d.format_human().to_string(), "just now"); } }