use std::{
fmt,
num::ParseIntError,
str::{self, FromStr},
};
use thiserror::Error;
/// The data for indicating authorship of an action within
/// [`crate::commit::CommitData`].
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct Author {
/// Name corresponding to `user.name` in the git config.
///
/// Note: this must not contain `<` or `>`.
pub name: String,
/// Email corresponding to `user.email` in the git config.
///
/// Note: this must not contain `<` or `>`.
pub email: String,
/// The time of this author's action.
pub time: Time,
}
/// The time of a [`Author`]'s action.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct Time {
seconds: i64,
offset: i32,
}
impl Time {
pub fn new(seconds: i64, offset: i32) -> Self {
Self { seconds, offset }
}
/// Return the time, in seconds, since the epoch.
pub fn seconds(&self) -> i64 {
self.seconds
}
/// Return the timezone offset, in minutes.
pub fn offset(&self) -> i32 {
self.offset
}
fn from_components<'a>(cs: &mut impl Iterator<Item = &'a str>) -> Result<Self, ParseError> {
let offset = match cs.next() {
None => Err(ParseError::Missing("offset")),
Some(offset) => Self::parse_offset(offset).map_err(ParseError::Offset),
}?;
let time = match cs.next() {
None => return Err(ParseError::Missing("time")),
Some(time) => time.parse::<i64>().map_err(ParseError::Time)?,
};
Ok(Self::new(time, offset))
}
fn parse_offset(offset: &str) -> Result<i32, ParseIntError> {
// The offset is in the form of timezone offset,
// e.g. +0200, -0100. This needs to be converted into
// minutes. The first two digits in the offset are the
// number of hours in the offset, while the latter two
// digits are the number of minutes in the offset.
let tz_offset = offset.parse::<i32>()?;
let hours = tz_offset / 100;
let minutes = tz_offset % 100;
Ok(hours * 60 + minutes)
}
}
impl FromStr for Time {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Self::from_components(&mut s.split(' ').rev())
}
}
impl fmt::Display for Time {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let sign = if self.offset.is_negative() { '-' } else { '+' };
let hours = self.offset.abs() / 60;
let minutes = self.offset.abs() % 60;
write!(f, "{} {}{:0>2}{:0>2}", self.seconds, sign, hours, minutes)
}
}
impl fmt::Display for Author {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{} <{}> {}", self.name, self.email, self.time,)
}
}
#[derive(Debug, Error)]
pub enum ParseError {
#[error("missing '{0}' while parsing person signature")]
Missing(&'static str),
#[error("offset was incorrect format while parsing person signature")]
Offset(#[source] ParseIntError),
#[error("time was incorrect format while parsing person signature")]
Time(#[source] ParseIntError),
}
impl FromStr for Author {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
// Splitting the string in 4 subcomponents is expected to give back the
// following iterator entries: timezone offset, time, email, and name
let mut components = s.rsplitn(4, ' ');
let time = Time::from_components(&mut components)?;
let email = components
.next()
.ok_or(ParseError::Missing("email"))?
.trim_matches(|c| c == '<' || c == '>')
.to_owned();
let name = components.next().ok_or(ParseError::Missing("name"))?;
Ok(Self {
name: name.to_owned(),
email: email.to_owned(),
time,
})
}
}