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A git-based task manager
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use crate::errors::{Error, Result};use crate::object::{CONTENT_FILE, StableId, TITLE_FILE};use git2::{Oid, Repository, Signature, Time};use std::collections::BTreeMap;use std::fmt::Write as _;
const MBOX_DATE: &str = "Mon Sep 17 00:00:00 2001";const TREE_DELIM: &str = "---tsk-tree---";const END_DELIM: &str = "---end---";
/// Standard mbox `From `-mangling: any line matching `^>*From ` gets one/// extra `>` on export so a strict mbox reader can't mistake it for an/// entry separator. Inverse on import.fn mangle_from(s: &str) -> String { let mut out = String::with_capacity(s.len() + 8); for line in s.split_inclusive('\n') { let arrows = line.bytes().take_while(|b| *b == b'>').count(); if line.len() >= arrows + 5 && &line.as_bytes()[arrows..arrows + 5] == b"From " { out.push('>'); } out.push_str(line); } out}
fn unmangle_from(s: &str) -> String { let mut out = String::with_capacity(s.len()); for line in s.split_inclusive('\n') { let arrows = line.bytes().take_while(|b| *b == b'>').count(); if arrows >= 1 && line.len() >= arrows + 5 && &line.as_bytes()[arrows..arrows + 5] == b"From " { out.push_str(&line[1..]); } else { out.push_str(line); } } out}
pub struct ExportOpts { /// If set, embed `X-Tsk-Namespace: <ns>-<human>` on the root entry so /// the recipient can opt in to binding the task into their namespace. pub bind: Option<(String, u32)>,}
pub fn export_task(repo: &Repository, stable: &StableId, opts: &ExportOpts) -> Result<String> { let r = repo.find_reference(&stable.refname())?; let tip = r .target() .ok_or_else(|| Error::Parse("task ref empty".into()))?; // Collect root → tip. let mut chain: Vec<Oid> = Vec::new(); let mut cur = Some(repo.find_commit(tip)?); while let Some(c) = cur { chain.push(c.id()); cur = c.parent(0).ok(); } chain.reverse(); let mut out = String::new(); for (idx, oid) in chain.iter().enumerate() { let commit = repo.find_commit(*oid)?; let parent = commit.parent(0).ok().map(|p| p.id()); let bind = if idx == 0 { opts.bind.as_ref() } else { None }; write_entry(&mut out, repo, &commit, parent, stable, bind)?; } Ok(out)}
fn fmt_git_time(t: Time) -> String { let off = t.offset_minutes(); let sign = if off >= 0 { '+' } else { '-' }; let off = off.abs(); format!("{} {}{:02}{:02}", t.seconds(), sign, off / 60, off % 60)}
fn parse_git_time(s: &str) -> Result<Time> { let (secs, offset) = s .split_once(' ') .ok_or_else(|| Error::Parse(format!("bad date: {s}")))?; let secs: i64 = secs .parse() .map_err(|_| Error::Parse(format!("bad date secs: {secs}")))?; let (sign, rest) = offset .split_at_checked(1) .ok_or_else(|| Error::Parse(format!("bad offset: {offset}")))?; let off_min: i32 = if rest.len() == 4 { let h: i32 = rest[..2] .parse() .map_err(|_| Error::Parse(format!("bad offset: {offset}")))?; let m: i32 = rest[2..] .parse() .map_err(|_| Error::Parse(format!("bad offset: {offset}")))?; h * 60 + m } else { return Err(Error::Parse(format!("bad offset: {offset}"))); }; let off_min = if sign == "-" { -off_min } else { off_min }; Ok(Time::new(secs, off_min))}
fn write_entry( out: &mut String, repo: &Repository, commit: &git2::Commit, parent: Option<Oid>, stable: &StableId, bind: Option<&(String, u32)>,) -> Result<()> { let author = commit.author(); let summary = commit.summary().ok().flatten().unwrap_or(""); let message = commit.message().unwrap_or(""); writeln!(out, "From {} {MBOX_DATE}", commit.id()).unwrap(); writeln!( out, "From: {} <{}>", author.name().unwrap_or(""), author.email().unwrap_or("") ) .unwrap(); writeln!(out, "Date: {}", fmt_git_time(author.when())).unwrap(); writeln!(out, "Subject: [PATCH tsk] {summary}").unwrap(); writeln!(out, "X-Tsk-Stable-Id: {stable}").unwrap(); writeln!( out, "X-Tsk-Parent: {}", parent .map(|o| o.to_string()) .unwrap_or_else(|| "none".into()) ) .unwrap(); if let Some((ns, human)) = bind { writeln!(out, "X-Tsk-Namespace: {ns}-{human}").unwrap(); } writeln!(out).unwrap(); let mangled_msg = mangle_from(message); out.push_str(&mangled_msg); if !mangled_msg.ends_with('\n') { out.push('\n'); } writeln!(out).unwrap(); writeln!(out, "{TREE_DELIM}").unwrap(); let tree = commit.tree()?; // Iterate in tree order (already sorted by name). for entry in tree.iter() { let Ok(name) = entry.name() else { continue }; if name == TITLE_FILE { // title is a cache; reconstructible from content. Skip. continue; } let blob = entry.to_object(repo)?.peel_to_blob()?; let bytes = blob.content(); let as_str = std::str::from_utf8(bytes).map_err(|e| Error::Parse(e.to_string()))?; let mangled = mangle_from(as_str); writeln!(out, "file: {name}").unwrap(); writeln!(out, "size: {}", mangled.len()).unwrap(); // Mangled bytes; size counts post-mangling. Importer reads `size` // bytes verbatim then runs the inverse unmangle. out.push_str(&mangled); out.push('\n'); } writeln!(out, "{END_DELIM}").unwrap(); writeln!(out).unwrap(); Ok(())}
#[derive(Debug)]struct Entry { author_name: String, author_email: String, when: Time, message: String, stable: String, ns_bind: Option<(String, u32)>, files: BTreeMap<String, Vec<u8>>,}
#[derive(Debug)]pub struct ImportResult { pub stable: StableId, pub commits_imported: usize, /// Hint from the sender: namespace + human id under which they had this /// task bound. Currently unused by the workspace layer (recipient decides /// binding) but parsed and exposed so future commands can honor it. #[allow(dead_code)] pub ns_bind: Option<(String, u32)>,}
/// Convenience wrapper for the single-task path: parse the mbox, expect/// exactly one task's chain, import it.#[allow(dead_code)] // kept for tests and external callers that want strict single-task semanticspub fn import_task(repo: &Repository, mbox: &str) -> Result<ImportResult> { let mut all = import_mbox(repo, mbox)?; if all.len() > 1 { return Err(Error::Parse(format!( "expected one task; mbox contained {}", all.len() ))); } all.pop() .ok_or_else(|| Error::Parse("no patch entries found".into()))}
/// Import every task in an mbox stream. Entries are grouped by their/// `X-Tsk-Stable-Id` header (consecutive entries with the same stable id/// belong to the same task's chain) and each group is imported in order.pub fn import_mbox(repo: &Repository, mbox: &str) -> Result<Vec<ImportResult>> { let entries = parse_mbox(mbox)?; if entries.is_empty() { return Err(Error::Parse("no patch entries found".into())); } // Group consecutive entries by stable id. let mut groups: Vec<Vec<Entry>> = Vec::new(); for e in entries { match groups.last_mut() { Some(g) if g[0].stable == e.stable => g.push(e), _ => groups.push(vec![e]), } } let mut out = Vec::with_capacity(groups.len()); for group in groups { out.push(import_one_chain(repo, &group)?); } Ok(out)}
fn import_one_chain(repo: &Repository, entries: &[Entry]) -> Result<ImportResult> { let stable_hex = entries[0].stable.clone(); let ns_bind = entries[0].ns_bind.clone(); let mut prev: Option<Oid> = None; for (idx, e) in entries.iter().enumerate() { if e.stable != stable_hex { return Err(Error::Parse(format!( "stable id mismatch within chain: {} vs {}", stable_hex, e.stable ))); } // Build the tree from the file map. let mut tb = repo.treebuilder(None)?; let content = e .files .get(CONTENT_FILE) .ok_or_else(|| Error::Parse("entry missing 'content' file".into()))?; let content_oid = repo.blob(content)?; if idx == 0 { // Verify stable id == sha of root content blob. if content_oid.to_string() != stable_hex { return Err(Error::Parse(format!( "stable id verification failed: expected {stable_hex}, content sha is {content_oid}" ))); } } tb.insert(CONTENT_FILE, content_oid, 0o100644)?; // Re-derive title cache from content. let title = std::str::from_utf8(content) .map_err(|e| Error::Parse(e.to_string()))? .lines() .next() .unwrap_or(""); let title_oid = repo.blob(title.as_bytes())?; tb.insert(TITLE_FILE, title_oid, 0o100644)?; for (name, bytes) in &e.files { if name == CONTENT_FILE || name == TITLE_FILE { continue; } let oid = repo.blob(bytes)?; tb.insert(name.as_str(), oid, 0o100644)?; } let tree_oid = tb.write()?; // Author = original sender (from the From: / Date: headers). // Committer = local user — same shape as `git rebase`, so the // history records who applied the import while preserving authorship. let author = Signature::new(&e.author_name, &e.author_email, &e.when)?; let committer = crate::object::signature(repo); let parents: Vec<git2::Commit> = prev .into_iter() .map(|o| repo.find_commit(o).unwrap()) .collect(); let parent_refs: Vec<&git2::Commit> = parents.iter().collect(); let commit_oid = repo.commit( None, &author, &committer, &e.message, &repo.find_tree(tree_oid)?, &parent_refs, )?; prev = Some(commit_oid); } let stable = StableId(stable_hex); repo.reference(&stable.refname(), prev.unwrap(), true, "import")?; Ok(ImportResult { stable, commits_imported: entries.len(), ns_bind, })}
fn parse_mbox(s: &str) -> Result<Vec<Entry>> { let mut entries = Vec::new(); // Split on lines starting with "From " (the mbox separator). The "From " // line is part of the entry it introduces. let mut starts: Vec<usize> = Vec::new(); let bytes = s.as_bytes(); if bytes.starts_with(b"From ") { starts.push(0); } let mut i = 0; while i + 5 < bytes.len() { if bytes[i] == b'\n' && &bytes[i + 1..i + 6] == b"From " { starts.push(i + 1); } i += 1; } starts.push(bytes.len()); for win in starts.windows(2) { let chunk = &s[win[0]..win[1]]; if chunk.trim().is_empty() { continue; } entries.push(parse_entry(chunk)?); } Ok(entries)}
/// Consume one `\n`-terminated line; trailing `\r` is stripped.fn pop_line<'a>(rest: &mut &'a [u8], eof_msg: &str) -> Result<&'a str> { let nl = rest .iter() .position(|b| *b == b'\n') .ok_or_else(|| Error::Parse(eof_msg.into()))?; let line = std::str::from_utf8(&rest[..nl]) .map_err(|e| Error::Parse(e.to_string()))? .trim_end_matches('\r'); *rest = &rest[nl + 1..]; Ok(line)}
fn parse_entry(chunk: &str) -> Result<Entry> { let mut lines = chunk.split_inclusive('\n'); // First line: "From <oid> Mon Sep 17 ..." let _ = lines.next(); let mut author_name = String::new(); let mut author_email = String::new(); let mut when: Option<Time> = None; let mut subject = String::new(); let mut stable = String::new(); let mut ns_bind: Option<(String, u32)> = None; // Headers until blank line. for line in lines.by_ref() { let trimmed = line.trim_end_matches(['\n', '\r']); if trimmed.is_empty() { break; } if let Some(v) = trimmed.strip_prefix("From: ") { // "Name <email>" if let Some((n, rest)) = v.split_once(" <") { author_name = n.to_string(); author_email = rest.trim_end_matches('>').to_string(); } else { author_name = v.to_string(); } } else if let Some(v) = trimmed.strip_prefix("Date: ") { when = Some(parse_git_time(v)?); } else if let Some(v) = trimmed.strip_prefix("Subject: ") { subject = v.strip_prefix("[PATCH tsk] ").unwrap_or(v).to_string(); } else if let Some(v) = trimmed.strip_prefix("X-Tsk-Stable-Id: ") { stable = v.to_string(); } else if let Some(_v) = trimmed.strip_prefix("X-Tsk-Parent: ") { // Informational only; we use the previous imported commit as parent. } else if let Some(v) = trimmed.strip_prefix("X-Tsk-Namespace: ") { if let Some((ns, h)) = v.rsplit_once('-') && let Ok(human) = h.parse::<u32>() { ns_bind = Some((ns.to_string(), human)); } } } if stable.is_empty() { return Err(Error::Parse("missing X-Tsk-Stable-Id".into())); } let when = when.ok_or_else(|| Error::Parse("missing Date".into()))?; // Body up to TREE_DELIM line. let mut message = String::new(); let mut in_tree = false; for line in lines.by_ref() { let trimmed = line.trim_end_matches(['\n', '\r']); if trimmed == TREE_DELIM { in_tree = true; break; } message.push_str(line); } if !in_tree { return Err(Error::Parse("missing tree delimiter".into())); } // Restore commit message: drop the trailing blank line we emitted. while message.ends_with("\n\n") { message.pop(); } // If the message is just the subject line (no body), use subject. let message = if message.trim().is_empty() { subject } else { unmangle_from(message.trim_end_matches('\n')) }; // Parse file blocks until END_DELIM. We need byte-level reads for the // size-prefixed bodies, so switch from `lines` to slice indexing. let mut files: BTreeMap<String, Vec<u8>> = BTreeMap::new(); let remaining = lines.collect::<String>(); let mut rest = remaining.as_bytes(); loop { let line = pop_line(&mut rest, "unexpected eof in tree")?; if line == END_DELIM { break; } let name = line .strip_prefix("file: ") .ok_or_else(|| Error::Parse(format!("expected 'file:' got: {line:?}")))? .to_string(); let size_line = pop_line(&mut rest, "unexpected eof reading size")?; let size: usize = size_line .strip_prefix("size: ") .ok_or_else(|| Error::Parse(format!("expected 'size:' got: {size_line:?}")))? .parse() .map_err(|_| Error::Parse(format!("bad size: {size_line}")))?; if rest.len() < size + 1 { return Err(Error::Parse("truncated file body".into())); } let mangled = std::str::from_utf8(&rest[..size]).map_err(|e| Error::Parse(e.to_string()))?; if rest[size] != b'\n' { return Err(Error::Parse("missing newline after file body".into())); } rest = &rest[size + 1..]; files.insert(name, unmangle_from(mangled).into_bytes()); } Ok(Entry { author_name, author_email, when, message, stable, ns_bind, files, })}
#[cfg(test)]mod test { use super::*; use crate::object::{self, Task}; use std::path::Path;
fn init_repo(p: &Path) -> Repository { let r = Repository::init(p).unwrap(); let mut cfg = r.config().unwrap(); cfg.set_str("user.name", "Tester").unwrap(); cfg.set_str("user.email", "t@e").unwrap(); r }
#[test] fn round_trip_single_commit() { let dir = tempfile::tempdir().unwrap(); let src = init_repo(dir.path()); let mut t = Task::new("Hello\n\nbody text"); t.properties.insert("status".into(), vec!["open".into()]); let stable = object::create(&src, &t, "create").unwrap();
let mbox = export_task(&src, &stable, &ExportOpts { bind: None }).unwrap(); assert!(mbox.starts_with("From ")); assert!(mbox.contains("X-Tsk-Stable-Id:")); assert!(mbox.contains(TREE_DELIM));
let dst_dir = tempfile::tempdir().unwrap(); let dst = init_repo(dst_dir.path()); let res = import_task(&dst, &mbox).unwrap(); assert_eq!(res.stable, stable); let read_back = object::read(&dst, &res.stable).unwrap().unwrap(); assert_eq!(read_back.content, t.content); assert_eq!(read_back.properties, t.properties); }
#[test] fn round_trip_preserves_history() { let dir = tempfile::tempdir().unwrap(); let src = init_repo(dir.path()); let t = Task::new("v1"); let stable = object::create(&src, &t, "create").unwrap(); let mut t2 = t.clone(); t2.content = "v2".into(); object::update(&src, &stable, &t2, "edit-2").unwrap(); let mut t3 = t2.clone(); t3.content = "v3".into(); object::update(&src, &stable, &t3, "edit-3").unwrap();
let mbox = export_task(&src, &stable, &ExportOpts { bind: None }).unwrap();
let dst_dir = tempfile::tempdir().unwrap(); let dst = init_repo(dst_dir.path()); let res = import_task(&dst, &mbox).unwrap(); assert_eq!(res.commits_imported, 3);
let head = dst .find_reference(&res.stable.refname()) .unwrap() .target() .unwrap(); let tip = dst.find_commit(head).unwrap(); assert_eq!(tip.summary().unwrap(), Some("edit-3")); let mid = tip.parent(0).unwrap(); assert_eq!(mid.summary().unwrap(), Some("edit-2")); let root = mid.parent(0).unwrap(); assert_eq!(root.summary().unwrap(), Some("create")); }
#[test] fn tamper_detected_via_stable_id_check() { let dir = tempfile::tempdir().unwrap(); let src = init_repo(dir.path()); let stable = object::create(&src, &Task::new("original content"), "create").unwrap(); let mbox = export_task(&src, &stable, &ExportOpts { bind: None }).unwrap(); // Flip the content body without updating the stable id header. // Equal-length substitution so size-prefix parsing still aligns; only // the SHA check should reject it. let tampered = mbox.replace("original content", "OVERRIDDEN BYTES"); assert_eq!("original content".len(), "OVERRIDDEN BYTES".len()); let dst_dir = tempfile::tempdir().unwrap(); let dst = init_repo(dst_dir.path()); let err = import_task(&dst, &tampered).unwrap_err(); let msg = format!("{err}"); assert!( msg.contains("stable id verification failed"), "expected verification error, got: {msg}" ); }
#[test] fn from_mangling_round_trip() { // Content has both a bare `From ` line and an already-quoted one. let s = "preamble\nFrom the desk of...\n>From me\nbody\n"; let mangled = mangle_from(s); assert_eq!( mangled, "preamble\n>From the desk of...\n>>From me\nbody\n", "every ^>*From line gets one extra '>'", ); assert_eq!(unmangle_from(&mangled), s); }
#[test] fn export_survives_strict_mbox_split() { // A naive mbox parser splits entries on `\n` followed by `From `. // Confirm the export only contains exactly one such boundary per // commit, no matter what's in the body. let dir = tempfile::tempdir().unwrap(); let src = init_repo(dir.path()); let stable = object::create( &src, &Task::new("evil\n\nFrom the desk of darth vader\nFrom another rogue line"), "create", ) .unwrap(); let mbox = export_task(&src, &stable, &ExportOpts { bind: None }).unwrap();
// Count `\nFrom ` occurrences (real entry boundaries). For our // single-commit export there should be exactly zero (the `From ` // separator at the very start of the mbox isn't preceded by `\n`). let interior_boundaries = mbox.match_indices("\nFrom ").count(); assert_eq!( interior_boundaries, 0, "no spurious entry boundaries should appear in the body: {mbox}" );
// And the round-trip still reconstructs the original content. let dst_dir = tempfile::tempdir().unwrap(); let dst = init_repo(dst_dir.path()); let res = import_task(&dst, &mbox).unwrap(); let task = object::read(&dst, &res.stable).unwrap().unwrap(); assert!(task.content.contains("From the desk")); assert!(task.content.contains("From another rogue")); }
fn init_repo_as(p: &Path, name: &str, email: &str) -> Repository { let r = Repository::init(p).unwrap(); let mut cfg = r.config().unwrap(); cfg.set_str("user.name", name).unwrap(); cfg.set_str("user.email", email).unwrap(); r }
#[test] fn import_preserves_author_sets_local_committer() { // Alice creates → exports. Bob imports. let alice_dir = tempfile::tempdir().unwrap(); let alice_repo = init_repo_as(alice_dir.path(), "Alice", "a@x"); let stable = object::create(&alice_repo, &Task::new("from alice"), "create").unwrap(); let mbox = export_task(&alice_repo, &stable, &ExportOpts { bind: None }).unwrap();
let bob_dir = tempfile::tempdir().unwrap(); let bob_repo = init_repo_as(bob_dir.path(), "Bob", "b@x"); let res = import_task(&bob_repo, &mbox).unwrap(); let head = bob_repo .find_reference(&res.stable.refname()) .unwrap() .target() .unwrap(); let commit = bob_repo.find_commit(head).unwrap(); assert_eq!(commit.author().name().unwrap(), "Alice"); assert_eq!(commit.committer().name().unwrap(), "Bob"); }
#[test] fn rebase_style_authorship_across_import_chain() { // Alice creates v1 → exports. Bob imports, edits, exports. // Alice imports Bob's mbox: root commit still authored by Alice, // second commit authored by Bob. let alice_dir = tempfile::tempdir().unwrap(); let alice_repo = init_repo_as(alice_dir.path(), "Alice", "a@x"); let stable = object::create(&alice_repo, &Task::new("from alice"), "create").unwrap(); let alice_mbox = export_task(&alice_repo, &stable, &ExportOpts { bind: None }).unwrap();
let bob_dir = tempfile::tempdir().unwrap(); let bob_repo = init_repo_as(bob_dir.path(), "Bob", "b@x"); import_task(&bob_repo, &alice_mbox).unwrap(); // Bob edits — append a property without changing content (so the // stable id stays the same). let mut bobs_task = object::read(&bob_repo, &stable).unwrap().unwrap(); bobs_task .properties .insert("priority".into(), vec!["high".into()]); object::update(&bob_repo, &stable, &bobs_task, "bob's edit").unwrap(); let bob_mbox = export_task(&bob_repo, &stable, &ExportOpts { bind: None }).unwrap();
// Alice imports Bob's mbox into a fresh clone. Force-overwrite is fine // because the import deliberately replaces the task ref. let alice2_dir = tempfile::tempdir().unwrap(); let alice2_repo = init_repo_as(alice2_dir.path(), "Alice", "a@x"); let res = import_task(&alice2_repo, &bob_mbox).unwrap(); let head = alice2_repo .find_reference(&res.stable.refname()) .unwrap() .target() .unwrap(); let tip = alice2_repo.find_commit(head).unwrap(); assert_eq!( tip.author().name().unwrap(), "Bob", "the edit commit's author must be Bob" ); assert_eq!( tip.committer().name().unwrap(), "Alice", "Alice imported, so the committer is Alice" ); let root = tip.parent(0).unwrap(); assert_eq!( root.author().name().unwrap(), "Alice", "the root commit's author must still be Alice across two hops" ); }
#[test] fn multi_task_mbox_imports_all_chains() { let dir = tempfile::tempdir().unwrap(); let src = init_repo(dir.path()); let s1 = object::create(&src, &Task::new("first task"), "create").unwrap(); let s2 = object::create(&src, &Task::new("second task"), "create").unwrap(); // Add an edit to s2 so it has a multi-commit chain — the grouping // logic must keep both of s2's entries together. let mut t2 = object::read(&src, &s2).unwrap().unwrap(); t2.properties.insert("priority".into(), vec!["low".into()]); object::update(&src, &s2, &t2, "edit-second").unwrap();
let mbox1 = export_task(&src, &s1, &ExportOpts { bind: None }).unwrap(); let mbox2 = export_task(&src, &s2, &ExportOpts { bind: None }).unwrap(); let combined = format!("{mbox1}{mbox2}");
let dst_dir = tempfile::tempdir().unwrap(); let dst = init_repo(dst_dir.path()); let outcomes = import_mbox(&dst, &combined).unwrap(); assert_eq!(outcomes.len(), 2, "two chains must yield two outcomes"); assert_eq!(outcomes[0].stable, s1); assert_eq!(outcomes[0].commits_imported, 1); assert_eq!(outcomes[1].stable, s2); assert_eq!(outcomes[1].commits_imported, 2); // Both task refs landed in the destination repo. assert!(dst.find_reference(&s1.refname()).is_ok()); assert!(dst.find_reference(&s2.refname()).is_ok()); }
#[test] fn ns_bind_header_round_trips() { let dir = tempfile::tempdir().unwrap(); let src = init_repo(dir.path()); let stable = object::create(&src, &Task::new("bind me"), "create").unwrap(); let mbox = export_task( &src, &stable, &ExportOpts { bind: Some(("alpha".into(), 7)), }, ) .unwrap(); assert!(mbox.contains("X-Tsk-Namespace: alpha-7")); let dst_dir = tempfile::tempdir().unwrap(); let dst = init_repo(dst_dir.path()); let res = import_task(&dst, &mbox).unwrap(); assert_eq!(res.ns_bind, Some(("alpha".to_string(), 7))); }}