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|
use std::{
collections::HashSet,
fs::{self, OpenOptions},
io::{Seek, Write},
};
use anyhow::Result;
use crate::{
files::{FileState, Locations},
history::{FileHistory, RepositoryHistory},
};
use super::ActionOptions;
pub fn shift(command_options: ActionOptions, new_cursor: usize) -> Result<()> {
let locations = Locations::from(&command_options);
let repository_index_path = locations.get_repository_index();
let mut repository_index_file = OpenOptions::new().write(true).open(repository_index_path)?;
let mut repository_history = RepositoryHistory::from_file(&mut repository_index_file)?;
let old_cursor = repository_history.cursor;
repository_history.cursor = new_cursor;
repository_history.write_to_file(&mut repository_index_file)?;
let changes_between_cursors = if old_cursor < new_cursor {
old_cursor..new_cursor
} else {
new_cursor..old_cursor
};
let affected_files_by_shift: Result<Vec<FileState>> = repository_history.get_changes()
[changes_between_cursors]
.iter()
.fold(HashSet::new(), |mut acc, change| {
for path in change.affected_files.iter() {
acc.insert(path);
}
acc
})
.iter()
.map(|path| FileState::from_working(&locations, path))
.collect();
for state in affected_files_by_shift? {
match state {
FileState::Tracked(tracked) => {
let mut history_file = tracked.load_history_file()?;
let file_history = FileHistory::from_file(&mut history_file)?;
if file_history.is_file_deleted(new_cursor) {
fs::remove_file(tracked.working_path)?;
} else {
let new_content = file_history.get_content(new_cursor);
let mut working_file = tracked.create_working_file()?;
working_file.rewind()?;
working_file.set_len(0)?;
working_file.write_all(&new_content)?;
}
}
FileState::Deleted(deleted) => {
let mut history_file = deleted.load_history_file()?;
let file_history = FileHistory::from_file(&mut history_file)?;
if !file_history.is_file_deleted(new_cursor) {
let mut new_working_file = deleted.create_working_file(&locations)?;
let new_content = file_history.get_content(new_cursor);
new_working_file.write_all(&new_content)?;
}
}
// TODO: What do we do with untracked files on a shift? Delete them?
_ => (),
}
}
Ok(())
}
|
