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use crate::*;
use std::time::SystemTime;
#[must_use]
pub fn copy(source_path: impl AsRef<Path>, destination_path: impl AsRef<Path>) -> WriteResult<()> {
let source = get_entry(&source_path)?;
let destination = get_optional_entry(&destination_path)?;
let destination_type = destination.and_then(|e| Some(e.entry_type));
match (source.entry_type, destination_type) {
(EntryType::File, Some(EntryType::File)) => {
copy_file(source_path, destination_path)?;
}
(EntryType::File, Some(EntryType::Directory)) => {
let destination_path = destination_path.as_ref().join(source.name);
copy_file(source_path, destination_path)?;
}
(EntryType::File, None) => {
make_parent_directory(&destination_path)?;
copy_file(&source_path, &destination_path)?;
}
(EntryType::Directory, Some(EntryType::File)) => {
// The file is replaced by a copy of the source directory
remove_file(&destination_path)?;
copy_directory(&source_path, &destination_path)?;
}
(EntryType::Directory, Some(EntryType::Directory)) => {
// The destination is filled with the contents of the source directory
for entry in list_directory(source_path)? {
let destination_path = destination_path.as_ref().join(&entry.name);
copy(entry.path, destination_path)?;
}
}
(EntryType::Directory, None) => {
// The destination is created as a copy of the source directory
copy_directory(&source_path, &destination_path)?;
}
}
Ok(())
}
#[must_use]
fn copy_file(source_path: impl AsRef<Path>, destination_path: impl AsRef<Path>) -> WriteResult<()> {
// Only copy file if size or last modified time is different to file at destination.
if let Comparison::Different(last_modified) = compare_files(&source_path, &destination_path) {
let copy_result = std::fs::copy(&source_path, &destination_path);
io_result_to_write_result(copy_result, &destination_path.as_ref())?;
if let Some(time) = last_modified {
if let Ok(dest) = std::fs::File::open(&destination_path) {
let _ = dest.set_modified(time);
}
}
}
Ok(())
}
#[must_use]
fn copy_directory(source_path: impl AsRef<Path>, destination_path: impl AsRef<Path>) -> WriteResult<()> {
for entry in list_directory(&source_path)? {
let destination_path = destination_path.as_ref().join(entry.name);
copy(entry.path, &destination_path)?;
}
Ok(())
}
enum Comparison {
Same,
Different(Option<SystemTime>),
}
fn compare_files(source_path: impl AsRef<Path>, destination_path: impl AsRef<Path>) -> Comparison {
let Ok(source) = std::fs::File::open(&source_path) else { return Comparison::Different(None) };
let Ok(source_metadata) = source.metadata() else { return Comparison::Different(None) };
let Ok(source_modified) = source_metadata.modified() else { return Comparison::Different(None) };
let Ok(dest) = std::fs::File::open(&destination_path) else { return Comparison::Different(Some(source_modified)) };
let Ok(dest_metadata) = dest.metadata() else { return Comparison::Different(Some(source_modified)) };
let Ok(dest_modified) = dest_metadata.modified() else { return Comparison::Different(Some(source_modified)) };
match source_modified == dest_modified && source_metadata.len() == dest_metadata.len() {
true => Comparison::Same,
false => Comparison::Different(Some(source_modified)),
}
}
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