fetcher 0.15.3

Data automation and pipelining framework
Documentation 
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/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

//! This module contains the transform [`Use`] that allows using the content of a [`Field`] as the new value of a different [`Field`]

use super::Transform;
use crate::{
	actions::transforms::{
		error::TransformErrorKind,
		field::Field,
		result::{OptionUnwrapTransformResultExt, TransformedEntry},
	},
	entry::{Entry, EntryId},
};

/// Use the value of a field as the value of a different field
#[derive(Debug)]
pub struct Use {
	/// use the value from this field
	pub field: Field,
	/// put the value into this field
	pub as_field: Field,
}

impl Transform for Use {
	type Err = TransformErrorKind;

	async fn transform_entry(&mut self, ent: Entry) -> Result<Vec<TransformedEntry>, Self::Err> {
		let val = match self.field {
			Field::Title => ent.msg.title,
			Field::Body => ent.msg.body,
			Field::Link => ent.msg.link,
			Field::Id => ent.id.map(|id| id.0.into_string()),
			Field::ReplyTo => ent.reply_to.map(|id| id.0.into_string()),
			Field::RawContents => ent.raw_contents,
		};

		let mut ent = TransformedEntry::default();
		match self.as_field {
			Field::Title => ent.msg.title = val.unwrap_or_empty(),
			Field::Body => ent.msg.body = val.unwrap_or_empty(),
			Field::Link => ent.msg.link = val.unwrap_or_empty(),
			Field::Id => ent.id = val.and_then(EntryId::new).unwrap_or_empty(),
			Field::ReplyTo => ent.reply_to = val.and_then(EntryId::new).unwrap_or_empty(),
			Field::RawContents => ent.raw_contents = val.unwrap_or_empty(),
		}

		Ok(vec![ent])
	}
}