use std::collections::{hash_map::Entry, HashMap}; use git::bstr::BStr;use git_repository as git;use itertools::Itertools; use crate::hours::{FileStats, LineStats, WorkByEmail, WorkByPerson}; const MINUTES_PER_HOUR: f32 = 60.0;pub const HOURS_PER_WORKDAY: f32 = 8.0; pub fn estimate_hours(    commits: &[(u32, git::actor::SignatureRef<'static>)],    stats: &[(u32, FileStats, LineStats)],) -> WorkByEmail {    assert!(!commits.is_empty());    const MAX_COMMIT_DIFFERENCE_IN_MINUTES: f32 = 2.0 * MINUTES_PER_HOUR;    const FIRST_COMMIT_ADDITION_IN_MINUTES: f32 = 2.0 * MINUTES_PER_HOUR;     let hours_for_commits = commits.iter().map(|t| &t.1).rev().tuple_windows().fold(        0_f32,        |hours, (cur, next): (&git::actor::SignatureRef<'_>, &git::actor::SignatureRef<'_>)| {            let change_in_minutes = (next                .time                .seconds_since_unix_epoch                .saturating_sub(cur.time.seconds_since_unix_epoch)) as f32                / MINUTES_PER_HOUR;            if change_in_minutes < MAX_COMMIT_DIFFERENCE_IN_MINUTES {                hours + change_in_minutes as f32 / MINUTES_PER_HOUR            } else {                hours + (FIRST_COMMIT_ADDITION_IN_MINUTES / MINUTES_PER_HOUR)            }        },    );     let author = &commits[0].1;    let (files, lines) = (!stats.is_empty())        .then(|| {            commits                .iter()                .map(|t| &t.0)                .fold((FileStats::default(), LineStats::default()), |mut acc, id| match stats                    .binary_search_by(|t| t.0.cmp(id))                {                    Ok(idx) => {                        let t = &stats[idx];                        acc.0.add(&t.1);                        acc.1.add(&t.2);                        acc                    }                    Err(_) => acc,                })        })        .unwrap_or_default();    WorkByEmail {        name: author.name,        email: author.email,        hours: FIRST_COMMIT_ADDITION_IN_MINUTES / 60.0 + hours_for_commits,        num_commits: commits.len() as u32,        files,        lines,    }} pub fn deduplicate_identities(persons: &[WorkByEmail]) -> Vec<WorkByPerson> {    let mut email_to_index = HashMap::<&'static BStr, usize>::with_capacity(persons.len());    let mut name_to_index = HashMap::<&'static BStr, usize>::with_capacity(persons.len());    let mut out = Vec::<WorkByPerson>::with_capacity(persons.len());    for person_by_email in persons {        match email_to_index.entry(person_by_email.email) {            Entry::Occupied(email_entry) => {                out[*email_entry.get()].merge(person_by_email);                name_to_index.insert(person_by_email.name, *email_entry.get());            }            Entry::Vacant(email_entry) => match name_to_index.entry(person_by_email.name) {                Entry::Occupied(name_entry) => {                    out[*name_entry.get()].merge(person_by_email);                    email_entry.insert(*name_entry.get());                }                Entry::Vacant(name_entry) => {                    let idx = out.len();                    name_entry.insert(idx);                    email_entry.insert(idx);                    out.push(person_by_email.into());                }            },        }    }    out}