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use std::path::{Path, PathBuf};
use anyhow::{Context, Error, Result};
use crate::{
actions::ActionOptions,
filesystem::{Fs, FsEntry},
};
pub struct Locations {
pub repository_path: PathBuf,
pub ka_path: PathBuf,
pub ka_files_path: PathBuf,
}
impl Locations {
pub fn get_repository_index_path(&self) -> PathBuf {
return self.ka_path.join("index");
}
pub fn get_repository_files<FS: Fs>(&self, fs: &mut FS) -> Result<Vec<FileState>, Error> {
let working_entries = fs
.read_directory(&self.repository_path)
.context("Failed reading working file entries.")?
.into_iter()
.filter(|e| e.path() == self.ka_path)
.collect();
let history_entries = fs
.read_directory(&self.ka_files_path)
.context("Failed reading history file entries.")?;
let working_files = Self::walk_directory(fs, working_entries, &|entry| {
FileState::from_working(self, &entry.path()).ok()
})?;
let deleted_files = Self::walk_directory(fs, history_entries, &|entry| {
let file_path = entry.path();
let file = FileState::from_history(self, &file_path).ok()?;
match file {
FileState::Deleted { .. } => Some(file),
FileState::Tracked { .. } => None,
_ => unreachable!(),
}
})?;
let mut all_files = working_files;
all_files.extend(deleted_files);
Ok(all_files)
}
pub fn working_from_history(&self, history_file_path: &Path) -> Result<PathBuf> {
let raw_path = history_file_path.strip_prefix(&self.ka_files_path)?;
Ok(self.repository_path.join(raw_path))
}
pub fn history_from_working(&self, working_file_path: &Path) -> Result<PathBuf> {
let raw_path = working_file_path.strip_prefix(&self.repository_path)?;
Ok(self.ka_files_path.join(raw_path))
}
fn walk_directory<FS: Fs>(
fs: &mut FS,
directory: Vec<FS::Entry>,
filter_map: &dyn Fn(&FS::Entry) -> Option<FileState>,
) -> Result<Vec<FileState>> {
let mut entries = Vec::new();
for entry in directory {
if entry.is_directory()? {
let nested_directory = fs.read_directory(&entry.path())?;
let nested_files = Self::walk_directory(fs, nested_directory, filter_map)?;
entries.extend(nested_files);
} else if let Some(states) = filter_map(&entry) {
entries.push(states);
}
}
Ok(entries)
}
}
impl From<&ActionOptions> for Locations {
fn from(options: &ActionOptions) -> Self {
let ka_path = options.repository_path.join(".ka");
let ka_files_path = ka_path.join("files");
Self {
repository_path: options.repository_path.clone(),
ka_path,
ka_files_path,
}
}
}
pub enum FileState {
Deleted(FileDeleted),
Untracked(FileUntracked),
Tracked(FileTracked),
}
impl FileState {
pub fn from_history(locations: &Locations, history_file_path: &Path) -> Result<Self> {
let working_path = locations.working_from_history(history_file_path)?;
Ok(if !working_path.exists() {
FileState::Deleted(FileDeleted {
history_path: history_file_path.to_path_buf(),
})
} else {
FileState::Tracked(FileTracked {
history_path: history_file_path.to_path_buf(),
working_path,
})
})
}
pub fn from_working(locations: &Locations, working_file_path: &Path) -> Result<Self> {
let history_path = locations.history_from_working(working_file_path)?;
// FIXME: Path::exists wouldn't work with Fs abstraction.
// TODO: Think whether abstracting Path would be needed for Fs abstraction.
Ok(if !history_path.exists() {
FileState::Untracked(FileUntracked {
path: working_file_path.to_path_buf(),
})
} else {
FileState::Tracked(FileTracked {
history_path,
working_path: working_file_path.to_path_buf(),
})
})
}
pub fn get_working_path(&self, locations: &Locations) -> Result<PathBuf> {
match self {
FileState::Deleted(deleted) => locations.working_from_history(&deleted.history_path),
FileState::Untracked(untracked) => Ok(untracked.path.clone()),
FileState::Tracked(tracked) => Ok(tracked.working_path.clone()),
}
}
}
pub struct FileDeleted {
pub history_path: PathBuf,
}
impl FileDeleted {
pub fn load_history_file<FS: Fs>(&self, fs: &mut FS) -> Result<FS::File> {
fs.open_writable_file(&self.history_path)
}
pub fn create_working_file<FS: Fs>(
&self,
fs: &mut FS,
locations: &Locations,
) -> Result<FS::File> {
let working_path = locations.working_from_history(&self.history_path)?;
fs.create_file(&working_path)
}
}
pub struct FileUntracked {
pub path: PathBuf,
}
impl FileUntracked {
pub fn load_file<FS: Fs>(&self, fs: &mut FS) -> Result<FS::File> {
fs.open_readable_file(&self.path)
}
pub fn create_history_file<FS: Fs>(
&self,
fs: &mut FS,
locations: &Locations,
) -> Result<FS::File> {
let history_path = locations.history_from_working(&self.path)?;
Ok(fs.create_file(&history_path)?)
}
}
pub struct FileTracked {
pub history_path: PathBuf,
pub working_path: PathBuf,
}
impl FileTracked {
pub fn load_history_file<FS: Fs>(&self, fs: &mut FS) -> Result<FS::File> {
fs.open_writable_file(&self.history_path)
}
pub fn load_working_file<FS: Fs>(&self, fs: &mut FS) -> Result<FS::File> {
fs.open_readable_file(&self.working_path)
}
pub fn create_working_file<FS: Fs>(&self, fs: &mut FS) -> Result<FS::File> {
fs.create_file(&self.working_path)
}
}
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