templates

src/repo.rs

@@ -4,11 +4,12 @@ use crate::{
 };
 
 use std::{
-	io::{ErrorKind, Read},
+	io::{ErrorKind, Read, Write},
 	path::Path,
 };
 
 const REPO_METADATA_FILE_NAME: &str = "meta.bin";
+const VERSION: [u8; 1] = [0];
 
 #[derive(Debug)]
 pub struct RepoMetadata {
@@ -17,6 +18,22 @@ pub struct RepoMetadata {
 	content: Vec<u8>,
 }
 
+#[derive(Debug)]
+pub enum WriteRepoMetadataError {
+	AlreadyExists,
+	CannotOpenFile(std::io::Error),
+	CannotWriteFile(std::io::Error),
+}
+
+impl From<std::io::Error> for WriteRepoMetadataError {
+	fn from(value: std::io::Error) -> Self {
+		match value.kind() {
+			ErrorKind::AlreadyExists => Self::AlreadyExists,
+			_ => Self::CannotWriteFile(value),
+		}
+	}
+}
+
 #[derive(Debug)]
 pub enum ReadRepoMetadataError {
 	CannotOpenFile(std::io::Error),
@@ -41,10 +58,35 @@ impl From<std::string::FromUtf8Error> for ReadRepoMetadataError {
 }
 
 impl RepoMetadata {
-	pub fn new(config: &Config, repo_dir: &Path) -> Result<Self, ReadRepoMetadataError> {
+	pub fn write_to_file(
+		&self,
+		config: &Config,
+		repo_dir: &Path,
+	) -> Result<(), WriteRepoMetadataError> {
+		let mut file = std::fs::OpenOptions::new()
+			.write(true)
+			.create_new(true)
+			.open(repo_dir.join("index"))
+			.map_err(WriteRepoMetadataError::CannotOpenFile)?;
+
+		file.write_all(&VERSION)?;
+
+		let now = std::time::UNIX_EPOCH.elapsed().unwrap().as_secs();
+		file.write_all(&now.to_be_bytes())?;
+
+		file.write_all(&(self.commit_url.len() as u32).to_be_bytes())?;
+
+		file.write_all(self.commit_url.as_bytes())?;
+
+		file.write_all(&self.content)?;
+
+		Ok(())
+	}
+
+	pub fn read_from_file(config: &Config, repo_dir: &Path) -> Result<Self, ReadRepoMetadataError> {
 		let mut file = std::fs::OpenOptions::new()
 			.read(true)
-			.open(repo_dir.join(""))
+			.open(repo_dir.join("index"))
 			.map_err(ReadRepoMetadataError::CannotOpenFile)?;
 
 		let mut version = [0u8; 1];
@@ -92,8 +134,8 @@ pub struct RepoMetadataIter<'a> {
 }
 
 pub struct RepoMetadataEntry<'a> {
-	file_path: &'a str,
-	hash: &'a str,
+	pub file_path: &'a str,
+	pub hash: &'a str,
 }
 
 impl<'a> Iterator for RepoMetadataIter<'a> {