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49 lines
1.1 KiB
49 lines
1.1 KiB
use crate::symbols::Symbol;
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use async_trait::async_trait;
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use std::error::Error;
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use std::fs::{metadata, File};
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use std::io::copy;
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use std::marker::PhantomData;
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use std::path::Path;
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#[derive(Debug)]
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pub struct Concat<S, D, I> {
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target: D,
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sources: S,
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source_item: PhantomData<I>,
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}
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impl<S, D, I> Concat<S, D, I> {
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pub fn new(sources: S, target: D) -> Self {
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Self {
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target,
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sources,
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source_item: PhantomData::default(),
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}
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}
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}
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#[async_trait(?Send)]
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impl<S: AsRef<[I]>, D: AsRef<Path>, I: AsRef<Path>> Symbol for Concat<S, D, I> {
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async fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
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let target = self.target.as_ref();
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if !target.exists() {
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return Ok(false);
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}
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let target_date = metadata(target)?.modified()?;
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for source in self.sources.as_ref() {
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if metadata(source)?.modified()? > target_date {
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return Ok(false);
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}
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}
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Ok(true)
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}
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async fn execute(&self) -> Result<(), Box<dyn Error>> {
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let mut file = File::create(self.target.as_ref())?;
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for source in self.sources.as_ref() {
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copy(&mut File::open(source)?, &mut file)?;
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}
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Ok(())
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}
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}
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