Working area

2 files changed, 206 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..7f6b86f
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,132 @@
+#![warn(clippy::pedantic)]
+#![warn(clippy::nursery)]
+
+use std::collections::HashMap;
+use std::fs::{File, Metadata};
+use std::path::{Path, PathBuf};
+use std::time::Instant;
+
+mod workarea;
+
+struct ContributorId(String);
+struct ChannelId(String);
+struct PatchId(String);
+struct FileId(String);
+struct SpanId(String);
+
+struct Remote {
+	url: String,
+	name: String,
+}
+
+struct Contributor {
+	id: ContributorId,
+	emails: Vec<String>,
+	nickname: String,
+	realname: Option<String>,
+	public_keys: Vec<String>,
+}
+
+struct Channel {
+	id: ChannelId,
+	name: String,
+	remotes: Vec<Remote>,
+	main_remote: Option<Remote>,
+	patches: Vec<PatchId>,
+}
+
+struct Patch {
+	id: PatchId,
+	authors: Vec<ContributorId>,
+	recorder: ContributorId,
+	metadata: HashMap<String, String>,
+	added_spans: Vec<SpanId>,
+	deleted_spans: Vec<SpanId>,
+	added_files: Vec<FileId>,
+	deleted_files: Vec<FileId>,
+}
+
+struct FileInfo {
+	id: FileId,
+	inode: Option<u64>,
+	spans: Vec<SpanId>,
+	added_by: Vec<PatchId>,
+	renamed_by: Vec<(PatchId, PathBuf)>,
+	deleted_by: Vec<PatchId>,
+}
+
+struct Span {
+	id: SpanId,
+	file: FileId,
+	after: Vec<SpanId>,
+	before: Vec<SpanId>,
+	contents: Vec<u8>,
+	added_by: Vec<PatchId>,
+	deleted_by: Vec<PatchId>,
+}
+
+type DiffAlgorithm = fn(File, File) -> Diff;
+
+struct Diff(Vec<DiffSpan>);
+
+struct DiffSpan {
+	left: Vec<u8>,
+	right: Vec<u8>,
+}
+
+struct Log {
+	entries: Vec<LogEntry>,
+}
+
+enum LogEntry {
+	CreatePatch(PatchId),
+}
+
+type RevertAlgorithm = fn(Patch) -> Patch;
+
+trait StagingArea {
+	fn list_files() -> std::io::Result<Metadata>;
+	fn open_file(path: &Path) -> std::io::Result<File>;
+	fn file_metadata(path: &Path) -> std::io::Result<Metadata>;
+	fn is_file_changed(path: &Path, since: Instant) -> std::io::Result<bool>;
+}
+
+trait Repository {
+	fn archive(&self) -> Vec<u8>;
+
+	fn remotes(&self) -> Vec<Remote>;
+	fn main_remote(&self) -> Option<Remote>;
+	fn set_main_remote(&mut self, remote: Option<Remote>);
+	fn add_remote(&mut self, remote: Remote);
+	fn delete_remote(&mut self, remote: Remote);
+	fn push(&self, remote: Remote);
+	fn pull(&mut self, remote: Remote);
+
+	fn all_contributors(&self) -> Vec<ContributorId>;
+	fn contributor(&self, id: ContributorId) -> Contributor;
+	fn credit(&self, filename: &Path, byte: usize) -> Option<ContributorId>;
+
+	fn all_channels(&self) -> Vec<ChannelId>;
+	fn active_channel(&self) -> ChannelId;
+	fn channel(&self, id: ChannelId) -> Channel;
+	fn create_channel(&mut self, channel: Channel);
+	fn change_channel(&mut self, id: ChannelId) -> Channel;
+	fn rename_channel(&mut self, id: ChannelId, name: &str) -> Channel;
+	fn delete_channel(&mut self, id: ChannelId);
+	fn add_patches_to_channel(&mut self, channel: ChannelId, patches: &[PatchId]) -> Channel;
+	fn add_channel_to_channel(&mut self, channel: ChannelId, plus: ChannelId) -> Channel;
+
+	fn all_patches(&self) -> Vec<PatchId>;
+	fn active_patches(&self) -> Vec<PatchId>;
+	fn patch(&self, id: PatchId) -> Option<Patch>;
+	fn create_patch(&mut self, patch: Patch);
+	fn delete_patch(&mut self, id: PatchId);
+	fn set_active_patches(&mut self, ids: &[PatchId]);
+	fn combine_patches(&mut self, patches: &[PatchId]) -> Patch;
+
+	fn active_files(&self) -> Vec<FileId>;
+	fn file(&self, id: FileId) -> Option<FileInfo>;
+	fn write_file_from_patch(&self, id: FileId, patch: PatchId) -> Vec<u8>;
+
+	fn span(&self, id: SpanId) -> Option<Span>;
+}
diff --git a/src/workarea.rs b/src/workarea.rs
new file mode 100644
index 0000000..d5d2e13
--- /dev/null
+++ b/src/workarea.rs
@@ -0,0 +1,74 @@
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::ops::Deref;
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+use std::time::{Instant, SystemTime};
+
+use walkdir::WalkDir;
+
+pub struct IgnoreFile {
+	globs: Arc<[Arc<str>]>,
+}
+
+pub struct WorkFileMetadata {
+	name: Arc<Path>,
+	last_modified: Instant,
+}
+
+fn equal_to_path(a: impl AsRef<Path>, b: impl AsRef<Path>) -> bool {
+	a.as_ref() == b.as_ref()
+}
+pub fn included_files(
+	root: impl AsRef<Path>,
+	ignored_files: Option<&IgnoreFile>,
+	since: Option<SystemTime>,
+) -> std::io::Result<Vec<PathBuf>> {
+	let mut files = Vec::new();
+
+	let walker = WalkDir::new(root).into_iter().filter_entry(|entry| {
+		!equal_to_path(entry.path(), ".pj")
+			&& !equal_to_path(entry.path(), ".ignore")
+			&& entry
+				.metadata()
+				.ok()
+				.is_some_and(|metadata| metadata.is_file())
+			&& ignored_files
+				.is_none_or(|file| !file.should_ignore(entry.path().to_string_lossy().deref()))
+			&& since
+				.zip(entry.metadata().ok())
+				.and_then(|(since, metadata)| {
+					metadata.modified().ok().map(|modified| (since, modified))
+				})
+				.is_none_or(|(since, modified)| since < modified)
+	});
+
+	for entry in walker {
+		files.push(entry?.into_path());
+	}
+
+	Ok(files)
+}
+
+impl IgnoreFile {
+	fn open(root: impl AsRef<Path>) -> std::io::Result<Self> {
+		let mut globs = Vec::new();
+		globs.push(String::from(".pj/"));
+
+		let ignore_file = Path::join(root.as_ref(), ".ignore");
+		let ignore_file = BufReader::new(File::open(ignore_file)?);
+		for line in ignore_file.lines() {
+			globs.push(line?);
+		}
+
+		Ok(Self {
+			globs: globs.iter().map(|s| s.deref().into()).collect(),
+		})
+	}
+
+	fn should_ignore(&self, path: &str) -> bool {
+		self.globs
+			.iter()
+			.any(|glob| fast_glob::glob_match(&**glob, path))
+	}
+}