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|
use std::{
fs::File,
io::{Read, Seek, Write},
path::PathBuf,
};
use serde::{Deserialize, Serialize};
use anyhow::{Context, Result};
use crate::diff::ContentChange;
#[derive(Serialize, Deserialize, Debug)]
pub struct RepositoryHistory {
pub cursor: usize,
changes: Vec<RepositoryChange>,
}
impl RepositoryHistory {
pub fn from_file(file: &mut File) -> Result<RepositoryHistory> {
let mut buffer = Vec::new();
file.read_to_end(&mut buffer)
.context("Failed reading repository history.")?;
let repository_history = serde_json::from_slice::<RepositoryHistory>(&buffer);
repository_history.context("Corrupted repository history.")
}
pub fn write_to_file(&self, file: &mut File) -> anyhow::Result<()> {
let encoded: Vec<u8> = serde_json::to_vec(self)?;
file.rewind()?;
file.set_len(0)?;
file.write_all(encoded.as_ref())?;
Ok(())
}
pub fn add_change(&mut self, change: RepositoryChange) {
self.changes.push(change);
}
}
impl Default for RepositoryHistory {
fn default() -> Self {
Self {
cursor: 0,
changes: Vec::new(),
}
}
}
#[derive(Serialize, Deserialize, Debug)]
pub struct RepositoryChange {
pub affected_files: Vec<PathBuf>,
pub timestamp: u64,
}
#[derive(Serialize, Deserialize, Debug)]
pub struct FileHistory {
changes: Vec<FileChange>,
}
impl FileHistory {
pub fn from_file(file: &mut File) -> Result<FileHistory> {
let mut buffer = Vec::new();
file.read_to_end(&mut buffer)
.context("Failed reading file history.")?;
let file_history = serde_json::from_slice::<FileHistory>(&buffer);
file_history.context("Corrupted file history.")
}
pub fn write_to_file(&self, file: &mut File) -> anyhow::Result<()> {
let encoded: Vec<u8> = serde_json::to_vec(self)?;
file.rewind()?;
file.set_len(0)?;
file.write_all(encoded.as_ref())?;
Ok(())
}
pub fn is_file_deleted(&self, at_cursor: usize) -> bool {
match self
.changes
.iter()
.take_while(|c| c.change_index <= at_cursor)
.last()
{
Some(change) => match change.variant {
FileChangeVariant::Deleted => true,
FileChangeVariant::Updated(_) => false,
},
None => false,
}
}
pub fn get_content(&self, at_cursor: usize) -> Vec<u8> {
let mut buffer = Vec::new();
for file_change in self
.changes
.iter()
.take_while(|change| change.change_index <= at_cursor)
{
if let FileChangeVariant::Updated(ref updated) = file_change.variant {
for change in updated.iter() {
change.apply(&mut buffer)
}
} else {
buffer.drain(0..);
}
}
buffer
}
pub fn add_change(&mut self, change: FileChange) {
self.changes.push(change);
}
}
impl Default for FileHistory {
fn default() -> Self {
Self {
changes: Vec::new(),
}
}
}
#[derive(Serialize, Deserialize, Debug)]
pub struct FileChange {
pub change_index: usize,
pub variant: FileChangeVariant,
}
#[derive(Serialize, Deserialize, Debug)]
pub enum FileChangeVariant {
Updated(Vec<ContentChange>),
Deleted,
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_get_content() {
let stages = &[
"",
"hiii!",
"yes hii? this is a test.",
"yes bye! this is not a test.",
];
let mut history = FileHistory::default();
history.add_change(FileChange {
change_index: 0,
variant: FileChangeVariant::Updated(Vec::new()),
});
for old_index in 0..stages.len() - 1 {
let old = stages[old_index].as_bytes();
let new = stages[old_index + 1].as_bytes();
let stage_difference = ContentChange::diff(old, new);
history.add_change(FileChange {
change_index: old_index + 1,
variant: FileChangeVariant::Updated(stage_difference),
});
}
for index in 0..stages.len() {
assert_eq!(stages[index].as_bytes(), history.get_content(index));
}
}
}
|
