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use std::{convert::TryFrom, slice::Iter};
use crate::{fragment::Fragment, trailer::Trailer};
/// A Collection of `Trailer`
#[derive(Debug, PartialEq, Eq, Clone, Default)]
pub struct Trailers<'a> {
trailers: Vec<Trailer<'a>>,
iterator_index: usize,
}
impl<'a> Trailers<'a> {
/// Iterate over the [`Trailers`]
///
/// # Examples
///
/// ```
/// use mit_commit::{Trailer, Trailers};
/// let trailers = Trailers::from(vec![
/// Trailer::new(
/// "Co-authored-by".into(),
/// "Billie Thompson <billie@example.com>".into(),
/// ),
/// Trailer::new(
/// "Co-authored-by".into(),
/// "Someone Else <someone@example.com>".into(),
/// ),
/// Trailer::new("Relates-to".into(), "#124".into()),
/// ]);
/// let mut iterator = trailers.iter();
///
/// assert_eq!(
/// iterator.next(),
/// Some(&Trailer::new(
/// "Co-authored-by".into(),
/// "Billie Thompson <billie@example.com>".into()
/// ))
/// );
/// assert_eq!(
/// iterator.next(),
/// Some(&Trailer::new(
/// "Co-authored-by".into(),
/// "Someone Else <someone@example.com>".into()
/// ))
/// );
/// assert_eq!(
/// iterator.next(),
/// Some(&Trailer::new("Relates-to".into(), "#124".into()))
/// );
/// assert_eq!(iterator.next(), None);
/// ```
pub fn iter(&self) -> Iter<'_, Trailer<'_>> {
self.trailers.iter()
}
/// How many [`Trailers`] are there
///
/// # Examples
///
/// ```
/// use mit_commit::{Trailer, Trailers};
/// let trailers = Trailers::from(vec![
/// Trailer::new(
/// "Co-authored-by".into(),
/// "Billie Thompson <billie@example.com>".into(),
/// ),
/// Trailer::new(
/// "Co-authored-by".into(),
/// "Someone Else <someone@example.com>".into(),
/// ),
/// ]);
///
/// assert_eq!(trailers.len(), 2)
/// ```
#[must_use]
pub fn len(&self) -> usize {
self.trailers.len()
}
/// Are there no [`Trailers`]
///
/// # Examples
///
/// ```
/// use mit_commit::{Trailer, Trailers};
/// assert_eq!(
/// Trailers::from(vec![
/// Trailer::new(
/// "Co-authored-by".into(),
/// "Billie Thompson <billie@example.com>".into()
/// ),
/// Trailer::new(
/// "Co-authored-by".into(),
/// "Someone Else <someone@example.com>".into()
/// ),
/// ])
/// .is_empty(),
/// false
/// );
///
/// let trailers: Vec<Trailer> = Vec::new();
/// assert_eq!(Trailers::from(trailers).is_empty(), true)
/// ```
#[must_use]
pub fn is_empty(&self) -> bool {
self.trailers.is_empty()
}
}
impl<'a> IntoIterator for Trailers<'a> {
type IntoIter = std::vec::IntoIter<Trailer<'a>>;
type Item = Trailer<'a>;
/// Iterate over the [`Trailers`]
///
/// # Examples
///
/// ```
/// use mit_commit::{Trailer, Trailers};
/// let trailers = Trailers::from(vec![
/// Trailer::new(
/// "Co-authored-by".into(),
/// "Billie Thompson <billie@example.com>".into(),
/// ),
/// Trailer::new(
/// "Co-authored-by".into(),
/// "Someone Else <someone@example.com>".into(),
/// ),
/// Trailer::new("Relates-to".into(), "#124".into()),
/// ]);
/// let mut iterator = trailers.into_iter();
///
/// assert_eq!(
/// iterator.next(),
/// Some(Trailer::new(
/// "Co-authored-by".into(),
/// "Billie Thompson <billie@example.com>".into()
/// ))
/// );
/// assert_eq!(
/// iterator.next(),
/// Some(Trailer::new(
/// "Co-authored-by".into(),
/// "Someone Else <someone@example.com>".into()
/// ))
/// );
/// assert_eq!(
/// iterator.next(),
/// Some(Trailer::new("Relates-to".into(), "#124".into()))
/// );
/// assert_eq!(iterator.next(), None);
/// ```
fn into_iter(self) -> Self::IntoIter {
self.trailers.into_iter()
}
}
impl<'a> From<Vec<Trailer<'a>>> for Trailers<'a> {
fn from(trailers: Vec<Trailer<'a>>) -> Self {
Self {
trailers,
iterator_index: 0,
}
}
}
impl<'a> From<Trailers<'a>> for String {
fn from(trailers: Trailers<'a>) -> Self {
trailers
.trailers
.into_iter()
.map(Self::from)
.collect::<Vec<_>>()
.join("\n")
}
}
impl<'a> From<Vec<Fragment<'a>>> for Trailers<'a> {
fn from(ast: Vec<Fragment<'a>>) -> Self {
ast.into_iter()
.filter_map(|values| {
if let Fragment::Body(body) = values {
Some(body)
} else {
None
}
})
.rev()
.filter_map(|body| {
if body.is_empty() {
None
} else {
Some(Trailer::try_from(body))
}
})
.take_while(std::result::Result::is_ok)
.flatten()
.collect::<Vec<Trailer<'_>>>()
.into_iter()
.rev()
.collect::<Vec<Trailer<'_>>>()
.into()
}
}