feat: read git history with go-git, not the git binary (#15)

2026-08-13 18:07:56 +01:00
parent de632ba6cc
commit a8675ac33b
15 changed files with 755 additions and 278 deletions
@@ -41,7 +41,8 @@ bin/chats/    sync.go import.go facts.go apply.go; libs in internal/chats
 bin/mail/     sync.go import.go (index_mail → brain/index.go)
 bin/markdown/ import.go (mistune leafs)
 bin/postgres/ query.go (read-only YAML)
-internal/     shared Go (brain/rank is cgo-free; chats parsers too)
+bin/git/      import.go (go-git history; Python shim execs it)
+internal/     shared Go (brain/rank is cgo-free; chats parsers; gitlog)
 bin/watch/    corpus watcher (used by bin/brain/watch.go)
 bin/tools/    vendored python libs behind bin/* (kblib, yamlout, websearch)
 bin/docker-entrypoint  container entrypoint (brain index|search|serve|watch)
@@ -81,6 +82,7 @@ bin/kb/search "query" [--repo X]                  # deprecated wrapper → bin/b
 bin/brain/search.go "query" [--root facts|info]   # deduction search → YAML
 bin/brain/get.go <id> [--body]
 bin/markdown/import.go [dir]                      # mistune leaves → YAML
+bin/git/import.go [REPO] [--json] [--limit N]     # go-git history → commit leafs
 bin/postgres/query.go --profile onlyoffice -c 'SELECT 1'
 bin/md/tables                                     # what the graph holds → YAML
 bin/brain/deduce "question"                       # thinking wrapper
@@ -42,6 +42,7 @@ detective method: **a fact needs ≥2 independent sources or it is
 | D16 | contradictions | ≥2 yes vs ≥2 no → unrelated sources conflict → hypothesis → `(not confirmed)`. Resolution (authority, staleness adjudication) = **v2**, tracked as open question. |
 | D17 | assertion gate | Fact-check every *claim* (facts → info → live sources → web), not every edit. Missing graph ≠ “does not exist”. |
 | D18 | reasoner | Pluggable OpenAI-compatible URL. RAM: Qwen3.5-9B. Quality: Bonsai-27B or Qwen3.6-27B. No official Qwen3.6-9B. |
+| D19 | git history | [go-git](https://github.com/go-git/go-git) via `bin/git/import.go`. No subprocess of the git binary. Conversion prints commit leafs; brain write is `bin/brain/index.go`. |

 ## Architecture

@@ -61,6 +62,7 @@ detective method: **a fact needs ≥2 independent sources or it is
    mail/import.go          JSON → markdown (no brain write)
    markdown/import.go      mistune leaves
    postgres/query.go       read-only YAML (wraps bin/db/psql-yq)
+    git/import.go           go-git history (no git binary; conversion only)
    chats/sync.go import.go facts.go apply.go
                            (libs in internal/chats; no chats index)
    md/import               (deprecated; bin/markdown/import.go)
@@ -95,6 +95,15 @@ bin/brain/eval.go                                    # recall@5 gate

 `--hop` is not implemented (needs File/FROM_FILE edges); the flag errors instead of walking. `bin/kb/search` is a deprecated wrapper around `bin/brain/search.go`.

+Git history is read with [go-git](https://github.com/go-git/go-git) (no git binary):
+
+```bash
+bin/git/import.go --json --limit 100              # commit leafs for this repo
+bin/git/import.go --root "$PROJECTS_ROOT" --json  # one pass per .git under root
+```
+
+Conversion only. Graph write (`File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person`) stays with `bin/brain/index.go`.
+
 Mail is a first-class corpus (retrievable through the same search):

 ```bash
@@ -1,154 +1,26 @@
 #!/usr/bin/env python3
-"""git/import - import git history (commits, authors, files) into the brain.
+"""git/import — deprecated. Use bin/git/import.go (go-git, no git binary).

-  bin/git/import [REPO]                 import all commits -> leafs + graph
-  bin/git/import --json                 emit import leafs as JSON, no write
-  bin/git/import --limit 100            cap commits processed
-  bin/git/import --since 2026-01-01     only recent commits
-  bin/git/import --root DIR             run per repo dir under DIR
-  bin/git/import --no-env               never read .env anywhere (default: true)
-
-Reads `git log --no-merges --name-only` from the repo, maps commits to
-`info` leafs (root=info, type=commit) and writes the version graph
-`File -[:HAS_VERSION]-> Commit -[:AUTHORED]-> Person` into var/kb.lbug.
-Idempotent: leaf MERGE by (source,text via leaf_id), graph MERGE by sha.
+  bin/git/import.go [REPO] [--json] [--limit N] [--since DATE]
 """
 from __future__ import annotations

-import json
-import subprocess
+import os
 import sys
 from pathlib import Path

 ROOT = Path(__file__).resolve().parents[2]
-sys.path.insert(0, str(ROOT / "bin" / "tools"))
-
-from kblib import (  # noqa: E402
-    connect, ensure_indexes, init_schema, upsert_leaf,
-)
-from gitimport import commits_to_leafs, ensure_git_schema, index_commits, parse_log  # noqa: E402
-
-LOG_FMT = "--format=%x1e%H%x1f%an%x1f%ae%x1f%aI%x1f%s"
-
-
-def git_log(repo: Path, limit: int = 0, since: str = "") -> str:
-    cmd = ["git", "-C", str(repo), "log", "--no-merges", "--name-only", LOG_FMT]
-    if since:
-        cmd += ["--since", since]
-    if limit:
-        cmd += ["-n", str(limit)]
-    try:
-        out = subprocess.run(cmd, capture_output=True, text=True, timeout=120)
-    except (FileNotFoundError, subprocess.TimeoutExpired):
-        return ""
-    if out.returncode != 0:
-        print(f"git/import: {repo}: {out.stderr.strip()}", file=sys.stderr)
-        return ""
-    return out.stdout
-
-
-def repo_name(repo: Path) -> str:
-    try:
-        out = subprocess.run(
-            ["git", "-C", str(repo), "remote", "get-url", "origin"],
-            capture_output=True, text=True, timeout=20)
-        url = out.stdout.strip()
-        return url.rstrip("/").split("/")[-1].removesuffix(".git") if url else repo.name
-    except (FileNotFoundError, subprocess.TimeoutExpired):
-        return repo.name
-
-
-def embedder():
-    from model2vec import StaticModel
-    model = StaticModel.from_pretrained("minishlab/potion-multilingual-128M")
-    return lambda text: model.encode([text])[0].astype(float).tolist()
-
-
-def import_repo(conn, repo: Path, embed, limit: int, since: str,
-                no_write: bool = False) -> tuple[int, int]:
-    raw = git_log(repo, limit, since)
-    commits = parse_log(raw)
-    leafs = commits_to_leafs(commits, repo_name(repo))
-    if no_write:
-        return len(commits), 0
-    written = 0
-    for lf in leafs:
-        query = f"{lf['heading']}\n\n{lf['text']}"
-        emb = embed(lf["text"]) if lf["text"] else None
-        upsert_leaf(conn, text=query, root="info", confidence="confirmed",
-                    source=lf["source"], source_rev="git", how="git/import",
-                    loc=lf["source"], type_=lf.get("type", "commit"),
-                    embedding=emb)
-        written += 1
-    index_commits(conn, commits, repo_name(repo))
-    return len(commits), written


 def main(argv: list[str]) -> int:
-    import argparse
-    p = argparse.ArgumentParser(description="import git history into the brain")
-    p.add_argument("repo", nargs="?", default=None)
-    p.add_argument("--root", default=None, help="directory of repos to import (each git dir separately)")
-    p.add_argument("--limit", type=int, default=0)
-    p.add_argument("--since", default="")
-    p.add_argument("--json", action="store_true")
-    p.add_argument("--dry-run", action="store_true", help="parse + report, no db write")
-    a = p.parse_args(argv)
-
-    repos: list[Path] = []
-    if a.repo:
-        repos = [Path(a.repo)]
-    elif a.root:
-        root = Path(a.root)
-        if root.is_file():
-            repos = [root]
-        else:
-            repos = [dp for dp in sorted(root.iterdir()) if (dp / ".git").exists() or dp.is_file()]
-    else:
-        repos = [ROOT]
-
-    total_commits = 0
-    results: list[dict] = []
-    if a.dry_run:
-        for repo in repos:
-            if not repo.exists():
-                continue
-            commits = parse_log(git_log(repo, a.limit, a.since))
-            name = repo_name(repo)
-            total_commits += len(commits)
-            results.append({"repo": name, "commits": len(commits),
-                            "leafs": len(commits_to_leafs(commits, name)), "path": str(repo)})
-        if a.json:
-            print(json.dumps(results, indent=2))
-        else:
-            for r in results:
-                print(f"{r['repo']:<24} {r['commits']:>5} commits -> {r['leafs']} leafs  {r['path']}")
-        return 0
-
-    # Never DROP FTS/VECTOR (ghost catalog). Upsert while indexes exist is OK;
-    # ensure_indexes only CREATEs when missing.
-    db, conn = connect(ROOT / "var" / "kb.lbug", read_only=False)
-    init_schema(conn)
-    embed = embedder()
-    rows: list[dict] = []
-    for repo in repos:
-        if not repo.exists():
-            continue
-        reached, written = import_repo(conn, repo, embed, a.limit, a.since)
-        total_commits += reached
-        rows.append({"repo": repo_name(repo), "commits": reached, "written": written})
-    ensure_indexes(conn)
-    conn.close()
-    db.close()
-
-    if a.json:
-        print(json.dumps(rows, indent=2))
-    else:
-        for r in rows:
-            print(f"imported {r['commits']:>5} commits -> {r['written']} leafs  {r['repo']}")
-        print(f"total: {total_commits} commits")
-    return 0
+    print(
+        "bin/git/import is deprecated; use bin/git/import.go (go-git)",
+        file=sys.stderr,
+    )
+    target = ROOT / "bin" / "git" / "import.go"
+    os.execvp("go", ["go", "run", str(target), *argv])
+    return 1


 if __name__ == "__main__":
-    sys.exit(main(sys.argv[1:]))
+    sys.exit(main(sys.argv[1:]))
@@ -0,0 +1,143 @@
+//usr/bin/env go run "$0" "$@"; exit
+//
+// bin/git/import.go - read git history with go-git (no git binary).
+//
+//	./bin/git/import.go [REPO]
+//	./bin/git/import.go --json
+//	./bin/git/import.go --limit 100 --since 2026-01-01
+//	./bin/git/import.go --root DIR
+//
+// Conversion only: prints commit leafs. Brain write is bin/brain/index.go.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"time"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/gitlog"
+)
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	var repo, root, since string
+	limit := 0
+	jsonOut := false
+	i := 0
+	for i < len(args) {
+		a := args[i]
+		switch {
+		case a == "--json":
+			jsonOut = true
+		case a == "--limit" && i+1 < len(args):
+			i++
+			n, err := strconv.Atoi(args[i])
+			if err != nil || n < 0 {
+				fmt.Fprintf(os.Stderr, "git/import: --limit must be a non-negative integer\n")
+				return 2
+			}
+			limit = n
+		case a == "--since" && i+1 < len(args):
+			i++
+			since = args[i]
+		case a == "--root" && i+1 < len(args):
+			i++
+			root = args[i]
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/git/import.go [REPO] [--json] [--limit N] [--since DATE] [--root DIR]`)
+			return 0
+		case len(a) > 0 && a[0] != '-':
+			repo = a
+		default:
+			fmt.Fprintf(os.Stderr, "git/import: unknown flag %s\n", a)
+			return 2
+		}
+		i++
+	}
+
+	var sinceT time.Time
+	if since != "" {
+		var err error
+		sinceT, err = parseSince(since)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %v\n", err)
+			return 2
+		}
+	}
+
+	repos := []string{}
+	if repo != "" {
+		repos = []string{repo}
+	} else if root != "" {
+		entries, err := os.ReadDir(root)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %v\n", err)
+			return 1
+		}
+		for _, e := range entries {
+			p := filepath.Join(root, e.Name())
+			if _, err := os.Stat(filepath.Join(p, ".git")); err == nil {
+				repos = append(repos, p)
+			}
+		}
+	} else {
+		repos = []string{cmdbin.Root()}
+	}
+
+	opt := gitlog.Options{Limit: limit, Since: sinceT}
+	type row struct {
+		Repo    string         `json:"repo"`
+		Path    string         `json:"path"`
+		Commits int            `json:"commits"`
+		Leafs   []gitlog.Leaf  `json:"leafs,omitempty"`
+	}
+	var rows []row
+	for _, p := range repos {
+		name, err := gitlog.RepoName(p)
+		if err != nil && name == "" {
+			fmt.Fprintf(os.Stderr, "git/import: %s: %v\n", p, err)
+			continue
+		}
+		cs, err := gitlog.Log(p, opt)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %s: %v\n", p, err)
+			return 1
+		}
+		leafs := make([]gitlog.Leaf, 0, len(cs))
+		for _, c := range cs {
+			leafs = append(leafs, gitlog.ToLeaf(c, name))
+		}
+		rows = append(rows, row{Repo: name, Path: p, Commits: len(cs), Leafs: leafs})
+	}
+
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		if err := enc.Encode(rows); err != nil {
+			return 1
+		}
+		return 0
+	}
+	for _, r := range rows {
+		fmt.Printf("%-24s %5d commits  %s\n", r.Repo, r.Commits, r.Path)
+	}
+	return 0
+}
+
+func parseSince(s string) (time.Time, error) {
+	for _, layout := range []string{time.RFC3339, "2006-01-02"} {
+		if t, err := time.Parse(layout, s); err == nil {
+			return t, nil
+		}
+	}
+	return time.Time{}, fmt.Errorf("cannot parse --since %q", s)
+}
@@ -1,21 +1,12 @@
-"""gitimport - parse `git log` output and turn commits into brain leafs.
+"""gitimport - Ladybug graph writes for Commit/File/Person (no git binary).

-Pure, testable functions. Field grammar (see bin/git/import):
-
-  git log --no-merges --name-only \
-      --format='%x1e%H%x1f%an%x1f%ae%x1f%aI%x1f%s'
-
-  0x1e = record separator, 0x1f = field separator.
-  Files: newline-separated lines following each record's subject.
+Commit records come from bin/git/import.go (go-git). This module only MERGEs
+the version graph File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person.
 """
-
 from __future__ import annotations

 from dataclasses import dataclass, field

-REC_SEP = "\x1e"
-FIELD_SEP = "\x1f"
-

@dataclass
 class Commit:
@@ -26,54 +17,6 @@ class Commit:
    subject: str
    files: list[str] = field(default_factory=list)

-    def leaf_text(self, repo: str) -> str:
-        head = f"commit {self.sha[:12]} in {repo} — {self.subject}"
-        body = [head, f"Author: {self.author} <{self.email}>", f"Date: {self.date}"]
-        if self.files:
-            body.append("Changing: " + ", ".join(self.files))
-        return "\n".join(body)
-
-
-def parse_log(text: str) -> list[Commit]:
-    """Parse `git log` output into Commit records.
-
-    Records are separated by 0x1e. A record is fields joined by 0x1f,
-    followed by optional newline-separated file paths inside the next
-    segment (git emits blank line + files after each record).
-    """
-    commits: list[Commit] = []
-    # field records and file lists alternate; simpler: split on REC_SEP,
-    # each chunk = header line, possibly followed by newline + files.
-    for chunk in text.split(REC_SEP):
-        chunk = chunk.strip("\n")
-        if not chunk:
-            continue
-        lines = chunk.split("\n", 1)
-        header = lines[0].split(FIELD_SEP)
-        if len(header) < 5:
-            continue
-        sha, author, email, date, subject = header[:5]
-        files = [ln.strip() for ln in lines[1].splitlines() if ln.strip()] if len(lines) > 1 else []
-        commits.append(Commit(sha=sha, author=author, email=email,
-                              date=date, subject=subject, files=files))
-    return commits
-
-
-def commits_to_leafs(commits: list[Commit], repo: str) -> list[dict]:
-    """Map commits to the leaf shape bin/kb/index expects (source/repo/...)."""
-    out: list[dict] = []
-    for c in commits:
-        out.append({
-            "source": f"{repo}@{c.sha}",
-            "repo": repo,
-            "heading": f"commit {c.sha[:12]} — {c.subject}",
-            "text": c.leaf_text(repo),
-            "type": "commit",
-            "status": "current",
-            "related": ",".join(c.files),
-        })
-    return out
-

 GIT_SCHEMA = (
    "CREATE NODE TABLE IF NOT EXISTS Commit (id STRING, repo STRING, subject STRING, "
@@ -114,4 +57,4 @@ def index_commits(conn, commits: list[Commit], repo: str) -> int:
            conn.execute("MATCH (f:File {id:$fid}), (c:Commit {id:$sha}) "
                         "MERGE (f)-[:HAS_VERSION]->(c)",
                         parameters={"fid": f"{repo}:{path}", "sha": c.sha})
-    return len(commits)
+    return len(commits)
@@ -91,3 +91,26 @@ class BinLayoutTest(unittest.TestCase):

    def test_postgres_query_is_shebang(self) -> None:
        self._assert_shebang("bin/postgres/query.go")
+
+    def test_git_import_is_gogit_shebang(self) -> None:
+        self._assert_shebang("bin/git/import.go")
+        py = (ROOT / "bin" / "git" / "import").read_text()
+        self.assertNotIn(
+            '["git"',
+            py,
+            "Python git/import must not subprocess the git binary",
+        )
+        self.assertIn("bin/git/import.go", py)
+
+    def test_gitimport_py_has_no_git_binary(self) -> None:
+        py = (ROOT / "bin" / "tools" / "gitimport.py").read_text()
+        self.assertNotIn("subprocess", py)
+        self.assertNotIn("git log", py)
+
+    def test_gogit_is_direct_go_mod_require(self) -> None:
+        text = (ROOT / "go.mod").read_text()
+        first = text.split("require (")[1].split(")")[0]
+        self.assertRegex(first, r"github.com/go-git/go-git/v5\s+v")
+        for line in first.splitlines():
+            if "go-git/go-git" in line:
+                self.assertNotIn("indirect", line)
@@ -9,12 +9,6 @@ sys.path.insert(0, str(Path(__file__).resolve().parent))
 import kblib  # noqa: E402
 import gitimport  # noqa: E402

-SAMPLE = (
-    "\x1e" + "a1b2c3d" + "\x1f" + "Ada Lovelace" + "\x1f" + "ada@example.com"
-    + "\x1f" + "2026-08-10T12:00:00+01:00" + "\x1f" + "feat: first commit"
-    + "\n\nREADME.md\nsrc/main.c\n"
-)
-
 COMMIT_PERSON_SCHEMA = (
    "CREATE NODE TABLE IF NOT EXISTS Commit (id STRING, repo STRING, subject STRING, "
    "author STRING, email STRING, date STRING, PRIMARY KEY(id))"
@@ -26,6 +20,17 @@ HAS_VERSION_SCHEMA = "CREATE REL TABLE IF NOT EXISTS HAS_VERSION (FROM File TO C
 AUTHORED_SCHEMA = "CREATE REL TABLE IF NOT EXISTS AUTHORED (FROM Commit TO Person)"


+def sample_commit() -> gitimport.Commit:
+    return gitimport.Commit(
+        sha="a1b2c3d",
+        author="Ada Lovelace",
+        email="ada@example.com",
+        date="2026-08-10T12:00:00+01:00",
+        subject="feat: first commit",
+        files=["README.md", "src/main.c"],
+    )
+
+
 class GitGraphTest(unittest.TestCase):
    def setUp(self):
        self.dir = tempfile.mkdtemp()
@@ -42,14 +47,12 @@ class GitGraphTest(unittest.TestCase):
        self.db.close()

    def test_index_commits_creates_nodes_and_edges(self):
-        cs = gitimport.parse_log(SAMPLE)
-        gitimport.index_commits(self.conn, cs, "sample-repo")
+        gitimport.index_commits(self.conn, [sample_commit()], "sample-repo")
        rp = self.conn.execute("MATCH (p:Person) RETURN p.name, p.email").get_all()
        self.assertEqual([tuple(r) for r in rp], [("Ada Lovelace", "ada@example.com")])
        rc = self.conn.execute("MATCH (c:Commit) RETURN c.id, c.repo").get_all()
        self.assertEqual(len(rc), 1)
        self.assertEqual(rc[0][1], "sample-repo")
-        # File -[:HAS_VERSION]-> Commit -[:AUTHORED]-> Person
        rf = self.conn.execute(
            "MATCH (f:File)-[:HAS_VERSION]->(c:Commit)-[:AUTHORED]->(p:Person) "
            "RETURN f.path, c.id, p.email").get_all()
@@ -58,7 +61,7 @@ class GitGraphTest(unittest.TestCase):
        self.assertTrue(all(r[2] == "ada@example.com" for r in rf))

    def test_index_commits_idempotent(self):
-        cs = gitimport.parse_log(SAMPLE)
+        cs = [sample_commit()]
        gitimport.index_commits(self.conn, cs, "sample-repo")
        gitimport.index_commits(self.conn, cs, "sample-repo")
        n = self.conn.execute("MATCH (c:Commit) RETURN count(*)").get_all()[0][0]
@@ -68,4 +71,4 @@ class GitGraphTest(unittest.TestCase):


 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()
@@ -1,57 +0,0 @@
-import sys
-import unittest
-from pathlib import Path
-
-sys.path.insert(0, str(Path(__file__).resolve().parent))
-
-import gitimport  # noqa: E402
-
-SAMPLE = (
-    "\x1e" + "a1b2c3d" + "\x1f" + "Ada Lovelace" + "\x1f" + "ada@example.com"
-    + "\x1f" + "2026-08-10T12:00:00+01:00" + "\x1f" + "feat: first commit"
-    + "\n\nREADME.md\nsrc/main.c\n"
-    + "\x1e" + "e4f5a6b" + "\x1f" + "Bob Babbage" + "\x1f" + "bob@example.com"
-    + "\x1f" + "2026-08-11T09:30:00+01:00" + "\x1f" + "fix: typo"
-    + "\n\ndocs/notes.md"
-)
-
-
-class GitparseTest(unittest.TestCase):
-    def test_parses_records(self):
-        cs = gitimport.parse_log(SAMPLE)
-        self.assertEqual(len(cs), 2)
-
-    def test_parses_commit_fields(self):
-        cs = gitimport.parse_log(SAMPLE)
-        c = cs[0]
-        self.assertEqual(c.sha, "a1b2c3d")
-        self.assertEqual(c.author, "Ada Lovelace")
-        self.assertEqual(c.email, "ada@example.com")
-        self.assertEqual(c.date, "2026-08-10T12:00:00+01:00")
-        self.assertEqual(c.subject, "feat: first commit")
-
-    def test_parses_changed_files(self):
-        cs = gitimport.parse_log(SAMPLE)
-        self.assertEqual(cs[0].files, ["README.md", "src/main.c"])
-        self.assertEqual(cs[1].files, ["docs/notes.md"])
-
-    def test_ignores_empty(self):
-        self.assertEqual(gitimport.parse_log(""), [])
-
-    def test_skip_malformed_record(self):
-        self.assertEqual(gitimport.parse_log("\x1eweird\x1e"), [])
-
-    def test_commit_leaf_shape(self):
-        leafs = gitimport.commits_to_leafs(gitimport.parse_log(SAMPLE), "sample-repo")
-        self.assertEqual(len(leafs), 2)
-        lf = leafs[0]
-        self.assertEqual(lf["type"], "commit")
-        self.assertEqual(lf["repo"], "sample-repo")
-        self.assertEqual(lf["source"], "sample-repo@a1b2c3d")
-        self.assertIn("Ada Lovelace", lf["text"])
-        self.assertIn("README.md", lf["related"])
-        self.assertIn("feat: first commit", lf["heading"])
-
-
-if __name__ == "__main__":
-    unittest.main()
@@ -39,6 +39,12 @@ class PublishedDocsTest(unittest.TestCase):
            "mail index is a brain write; README must name bin/brain/index.go",
        )

+    def test_readme_git_import_is_gogit(self) -> None:
+        text = (ROOT / "README.md").read_text()
+        self.assertIn("bin/git/import.go", text)
+        self.assertIn("go-git", text)
+        self.assertIn("D19", (ROOT / "PLAN.md").read_text())
+
    def test_docs_do_not_claim_hop_walks(self) -> None:
        paths = [
            ROOT / "README.md",
@@ -46,7 +46,8 @@ Every assertion edge carries:
 Content leafs: `sha256`, `observed_at`, `source_rev`, `confidence`. Stale = a
 file changed on disk (git HEAD/mtime) after its last observed `source_rev`.
 `File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person` records the history of every
-content leaf.
+content leaf. Commit records come from `bin/git/import.go` (go-git, no git
+binary); conversion prints leafs, brain write is `bin/brain/index.go`.

 `bin/facts/audit stale` flags leafs whose observed revision is behind the
 corpus HEAD.
@@ -7,19 +7,38 @@ require (
 	github.com/arran4/golang-ical v0.3.5
 	github.com/chewxy/math32 v1.11.2
 	github.com/daulet/tokenizers v1.27.0
+	github.com/go-git/go-git/v5 v5.19.2
 	golang.org/x/text v0.40.0
 )

 require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/ProtonMail/go-crypto v1.1.6 // indirect
 	github.com/apache/arrow-go/v18 v18.6.0 // indirect
+	github.com/cloudflare/circl v1.6.3 // indirect
+	github.com/cyphar/filepath-securejoin v0.6.1 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
+	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
+	github.com/go-git/go-billy/v5 v5.9.0 // indirect
 	github.com/goccy/go-json v0.10.6 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
 	github.com/google/flatbuffers v25.12.19+incompatible // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
 	github.com/klauspost/compress v1.18.5 // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
 	github.com/pierrec/lz4/v4 v4.1.26 // indirect
+	github.com/pjbgf/sha1cd v0.6.0 // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
+	github.com/skeema/knownhosts v1.3.1 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	github.com/zeebo/xxh3 v1.1.0 // indirect
-	golang.org/x/exp v0.0.0-20260112195511-716be5621a96 // indirect
-	golang.org/x/sys v0.43.0 // indirect
+	golang.org/x/crypto v0.53.0 // indirect
+	golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f // indirect
+	golang.org/x/net v0.56.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
 )
@@ -1,50 +1,138 @@
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
 github.com/LadybugDB/go-ladybug v0.17.0 h1:RXDbkBjrbRmLdEbhGl4CLOIEzSt09gbP0n9UbKDEfwI=
 github.com/LadybugDB/go-ladybug v0.17.0/go.mod h1:GeIXmE8XyF5TFS94NAuTag7vgCC+no/HTBMRA6Rd5Cs=
+github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/ProtonMail/go-crypto v1.1.6 h1:ZcV+Ropw6Qn0AX9brlQLAUXfqLBc7Bl+f/DmNxpLfdw=
+github.com/ProtonMail/go-crypto v1.1.6/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
 github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=
 github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
 github.com/apache/arrow-go/v18 v18.6.0 h1:GX/Jyd3R7mCLiECAwY9FWbbaYblie2WXBSz4Sw8fNpM=
 github.com/apache/arrow-go/v18 v18.6.0/go.mod h1:gm3MiPpY82fLYK5VKPB3WoJbsiLVDfT7flD5/vHReKw=
 github.com/apache/thrift v0.22.0 h1:r7mTJdj51TMDe6RtcmNdQxgn9XcyfGDOzegMDRg47uc=
 github.com/apache/thrift v0.22.0/go.mod h1:1e7J/O1Ae6ZQMTYdy9xa3w9k+XHWPfRvdPyJeynQ+/g=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/arran4/golang-ical v0.3.5 h1:bbz6ld4dC+MmCKiFfOd6SkmIGnhNMBACZ485ULh7p9A=
 github.com/arran4/golang-ical v0.3.5/go.mod h1:OnguFgjN0Hmx8jzpmWcC+AkHio94ujmLHKoaef7xQh8=
 github.com/chewxy/math32 v1.11.2 h1:IufN08Zwr1NKuWfY+4Tz55BcwKmyKKNdOP7KtumehnM=
 github.com/chewxy/math32 v1.11.2/go.mod h1:dOB2rcuFrCn6UHrze36WSLVPKtzPMRAQvBvUwkSsLqs=
+github.com/cloudflare/circl v1.6.3 h1:9GPOhQGF9MCYUeXyMYlqTR6a5gTrgR/fBLXvUgtVcg8=
+github.com/cloudflare/circl v1.6.3/go.mod h1:2eXP6Qfat4O/Yhh8BznvKnJ+uzEoTQ6jVKJRn81BiS4=
+github.com/cyphar/filepath-securejoin v0.6.1 h1:5CeZ1jPXEiYt3+Z6zqprSAgSWiggmpVyciv8syjIpVE=
+github.com/cyphar/filepath-securejoin v0.6.1/go.mod h1:A8hd4EnAeyujCJRrICiOWqjS1AX0a9kM5XL+NwKoYSc=
 github.com/daulet/tokenizers v1.27.0 h1:MmFYAEDFz69s/nNQfHg59DWqHz3v94m99kEZ/JbL+s4=
 github.com/daulet/tokenizers v1.27.0/go.mod h1:YjFY1o1HGMyWkQgbXJDghhvke/yFDp2vGdIO2hYs4MQ=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/elazarl/goproxy v1.7.2 h1:Y2o6urb7Eule09PjlhQRGNsqRfPmYI3KKQLFpCAV3+o=
+github.com/elazarl/goproxy v1.7.2/go.mod h1:82vkLNir0ALaW14Rc399OTTjyNREgmdL2cVoIbS6XaE=
+github.com/emirpasic/gods v1.18.1 h1:FXtiHYKDGKCW2KzwZKx0iC0PQmdlorYgdFG9jPXJ1Bc=
+github.com/emirpasic/gods v1.18.1/go.mod h1:8tpGGwCnJ5H4r6BWwaV6OrWmMoPhUl5jm/FMNAnJvWQ=
+github.com/gliderlabs/ssh v0.3.8 h1:a4YXD1V7xMF9g5nTkdfnja3Sxy1PVDCj1Zg4Wb8vY6c=
+github.com/gliderlabs/ssh v0.3.8/go.mod h1:xYoytBv1sV0aL3CavoDuJIQNURXkkfPA/wxQ1pL1fAU=
+github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 h1:+zs/tPmkDkHx3U66DAb0lQFJrpS6731Oaa12ikc+DiI=
+github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376/go.mod h1:an3vInlBmSxCcxctByoQdvwPiA7DTK7jaaFDBTtu0ic=
+github.com/go-git/go-billy/v5 v5.9.0 h1:jItGXszUDRtR/AlferWPTMN4j38BQ88XnXKbilmmBPA=
+github.com/go-git/go-billy/v5 v5.9.0/go.mod h1:jCnQMLj9eUgGU7+ludSTYoZL/GGmii14RxKFj7ROgHw=
+github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399 h1:eMje31YglSBqCdIqdhKBW8lokaMrL3uTkpGYlE2OOT4=
+github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399/go.mod h1:1OCfN199q1Jm3HZlxleg+Dw/mwps2Wbk9frAWm+4FII=
+github.com/go-git/go-git/v5 v5.19.2 h1:wkfn7vOlUBu8ivAWKBWisTiwJK4jYHzTF8Ndv1LyGqY=
+github.com/go-git/go-git/v5 v5.19.2/go.mod h1:QqCBE1EFN5ddFmrliLQ3/ntRCUjZU3EJuwuB/jWEHjk=
 github.com/goccy/go-json v0.10.6 h1:p8HrPJzOakx/mn/bQtjgNjdTcN+/S6FcG2CTtQOrHVU=
 github.com/goccy/go-json v0.10.6/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
+github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 h1:f+oWsMOmNPc8JmEHVZIycC7hBoQxHH9pNKQORJNozsQ=
+github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8/go.mod h1:wcDNUvekVysuuOpQKo3191zZyTpiI6se1N1ULghS0sw=
 github.com/google/flatbuffers v25.12.19+incompatible h1:haMV2JRRJCe1998HeW/p0X9UaMTK6SDo0ffLn2+DbLs=
 github.com/google/flatbuffers v25.12.19+incompatible/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 h1:BQSFePA1RWJOlocH6Fxy8MmwDt+yVQYULKfN0RoTN8A=
+github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99/go.mod h1:1lJo3i6rXxKeerYnT8Nvf0QmHCRC1n8sfWVwXF2Frvo=
+github.com/kevinburke/ssh_config v1.2.0 h1:x584FjTGwHzMwvHx18PXxbBVzfnxogHaAReU4gf13a4=
+github.com/kevinburke/ssh_config v1.2.0/go.mod h1:CT57kijsi8u/K/BOFA39wgDQJ9CxiF4nAY/ojJ6r6mM=
 github.com/klauspost/compress v1.18.5 h1:/h1gH5Ce+VWNLSWqPzOVn6XBO+vJbCNGvjoaGBFW2IE=
 github.com/klauspost/compress v1.18.5/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
 github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzhA9Y=
 github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/onsi/gomega v1.34.1 h1:EUMJIKUjM8sKjYbtxQI9A4z2o+rruxnzNvpknOXie6k=
+github.com/onsi/gomega v1.34.1/go.mod h1:kU1QgUvBDLXBJq618Xvm2LUX6rSAfRaFRTcdOeDLwwY=
 github.com/pierrec/lz4/v4 v4.1.26 h1:GrpZw1gZttORinvzBdXPUXATeqlJjqUG/D87TKMnhjY=
 github.com/pierrec/lz4/v4 v4.1.26/go.mod h1:EoQMVJgeeEOMsCqCzqFm2O0cJvljX2nGZjcRIPL34O4=
+github.com/pjbgf/sha1cd v0.6.0 h1:3WJ8Wz8gvDz29quX1OcEmkAlUg9diU4GxJHqs0/XiwU=
+github.com/pjbgf/sha1cd v0.6.0/go.mod h1:lhpGlyHLpQZoxMv8HcgXvZEhcGs0PG/vsZnEJ7H0iCM=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
+github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
+github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 h1:n661drycOFuPLCN3Uc8sB6B/s6Z4t2xvBgU1htSHuq8=
+github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3/go.mod h1:A0bzQcvG0E7Rwjx0REVgAGH58e96+X0MeOfepqsbeW4=
 github.com/shopspring/decimal v1.4.0 h1:bxl37RwXBklmTi0C79JfXCEBD1cqqHt0bbgBAGFp81k=
 github.com/shopspring/decimal v1.4.0/go.mod h1:gawqmDU56v4yIKSwfBSFip1HdCCXN8/+DMd9qYNcwME=
+github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
+github.com/skeema/knownhosts v1.3.1 h1:X2osQ+RAjK76shCbvhHHHVl3ZlgDm8apHEHFqRjnBY8=
+github.com/skeema/knownhosts v1.3.1/go.mod h1:r7KTdC8l4uxWRyK2TpQZ/1o5HaSzh06ePQNxPwTcfiY=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/xanzy/ssh-agent v0.3.3 h1:+/15pJfg/RsTxqYcX6fHqOXZwwMP+2VyYWJeWM2qQFM=
+github.com/xanzy/ssh-agent v0.3.3/go.mod h1:6dzNDKs0J9rVPHPhaGCukekBHKqfl+L3KghI1Bc68Uw=
 github.com/zeebo/assert v1.3.0 h1:g7C04CbJuIDKNPFHmsk4hwZDO5O+kntRxzaUoNXj+IQ=
 github.com/zeebo/assert v1.3.0/go.mod h1:Pq9JiuJQpG8JLJdtkwrJESF0Foym2/D9XMU5ciN/wJ0=
 github.com/zeebo/xxh3 v1.1.0 h1:s7DLGDK45Dyfg7++yxI0khrfwq9661w9EN78eP/UZVs=
 github.com/zeebo/xxh3 v1.1.0/go.mod h1:IisAie1LELR4xhVinxWS5+zf1lA4p0MW4T+w+W07F5s=
-golang.org/x/exp v0.0.0-20260112195511-716be5621a96 h1:Z/6YuSHTLOHfNFdb8zVZomZr7cqNgTJvA8+Qz75D8gU=
-golang.org/x/exp v0.0.0-20260112195511-716be5621a96/go.mod h1:nzimsREAkjBCIEFtHiYkrJyT+2uy9YZJB7H1k68CXZU=
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-golang.org/x/sys v0.43.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
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+golang.org/x/crypto v0.53.0/go.mod h1:DNLU434OwVakk9PzuwV8w62mAJpRJL3vsgcfp4Qnsio=
+golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f h1:W3F4c+6OLc6H2lb//N1q4WpJkhzJCK5J6kUi1NTVXfM=
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+golang.org/x/net v0.56.0 h1:Rw8j/hFzGvJUZwNBXnAtf5sVDVt+65SK2C7IxCxZt5o=
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 golang.org/x/text v0.40.0 h1:Ub2Z6/xjgF1WrYQz2nuITOEegKFtiIy+rieRJ5lHZKs=
 golang.org/x/text v0.40.0/go.mod h1:hpnzDAfGV753zIKo+wk3u1bVKCGPbrnF7+7LBF/UHVY=
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 gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
 gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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+gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=
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 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
@@ -0,0 +1,180 @@
+// Package gitlog reads commit history with go-git (no git binary).
+package gitlog
+
+import (
+	"errors"
+	"fmt"
+	"path"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+type Options struct {
+	Limit int
+	Since time.Time
+}
+
+type Commit struct {
+	SHA     string   `json:"sha"`
+	Author  string   `json:"author"`
+	Email   string   `json:"email"`
+	Date    string   `json:"date"`
+	Subject string   `json:"subject"`
+	Files   []string `json:"files"`
+}
+
+type Leaf struct {
+	Source  string `json:"source"`
+	Repo    string `json:"repo"`
+	Heading string `json:"heading"`
+	Text    string `json:"text"`
+	Type    string `json:"type"`
+	Status  string `json:"status"`
+	Related string `json:"related"`
+}
+
+// Log walks commits from HEAD, newest first, skipping merges.
+func Log(repo string, opt Options) ([]Commit, error) {
+	r, err := git.PlainOpen(repo)
+	if err != nil {
+		return nil, err
+	}
+	logOpt := &git.LogOptions{Order: git.LogOrderCommitterTime}
+	if !opt.Since.IsZero() {
+		t := opt.Since
+		logOpt.Since = &t
+	}
+	iter, err := r.Log(logOpt)
+	if err != nil {
+		return nil, err
+	}
+	defer iter.Close()
+
+	var out []Commit
+	err = iter.ForEach(func(c *object.Commit) error {
+		if c.NumParents() > 1 {
+			return nil
+		}
+		if opt.Limit > 0 && len(out) >= opt.Limit {
+			return Stop
+		}
+		files, ferr := changedFiles(c)
+		if ferr != nil {
+			return ferr
+		}
+		out = append(out, Commit{
+			SHA:     c.Hash.String(),
+			Author:  c.Author.Name,
+			Email:   c.Author.Email,
+			Date:    c.Author.When.Format(time.RFC3339),
+			Subject: firstLine(c.Message),
+			Files:   files,
+		})
+		return nil
+	})
+	if errors.Is(err, Stop) {
+		err = nil
+	}
+	return out, err
+}
+
+// Stop ends a log walk early (limit reached).
+var Stop = fmt.Errorf("gitlog: stop")
+
+func changedFiles(c *object.Commit) ([]string, error) {
+	var names []string
+	if c.NumParents() == 0 {
+		t, err := c.Tree()
+		if err != nil {
+			return nil, err
+		}
+		err = t.Files().ForEach(func(f *object.File) error {
+			names = append(names, f.Name)
+			return nil
+		})
+		sort.Strings(names)
+		return names, err
+	}
+	parent, err := c.Parent(0)
+	if err != nil {
+		return nil, err
+	}
+	from, err := parent.Tree()
+	if err != nil {
+		return nil, err
+	}
+	to, err := c.Tree()
+	if err != nil {
+		return nil, err
+	}
+	changes, err := object.DiffTree(from, to)
+	if err != nil {
+		return nil, err
+	}
+	for _, ch := range changes {
+		name := ch.To.Name
+		if name == "" {
+			name = ch.From.Name
+		}
+		if name != "" {
+			names = append(names, name)
+		}
+	}
+	sort.Strings(names)
+	return names, nil
+}
+
+func firstLine(msg string) string {
+	msg = strings.ReplaceAll(msg, "\r\n", "\n")
+	if i := strings.IndexByte(msg, '\n'); i >= 0 {
+		return strings.TrimSpace(msg[:i])
+	}
+	return strings.TrimSpace(msg)
+}
+
+func ToLeaf(c Commit, repo string) Leaf {
+	short := c.SHA
+	if len(short) > 12 {
+		short = short[:12]
+	}
+	head := fmt.Sprintf("commit %s — %s", short, c.Subject)
+	body := []string{
+		fmt.Sprintf("commit %s in %s — %s", short, repo, c.Subject),
+		fmt.Sprintf("Author: %s <%s>", c.Author, c.Email),
+		fmt.Sprintf("Date: %s", c.Date),
+	}
+	if len(c.Files) > 0 {
+		body = append(body, "Changing: "+strings.Join(c.Files, ", "))
+	}
+	return Leaf{
+		Source:  repo + "@" + c.SHA,
+		Repo:    repo,
+		Heading: head,
+		Text:    strings.Join(body, "\n"),
+		Type:    "commit",
+		Status:  "current",
+		Related: strings.Join(c.Files, ","),
+	}
+}
+
+func RepoName(repo string) (string, error) {
+	r, err := git.PlainOpen(repo)
+	if err != nil {
+		return filepath.Base(repo), err
+	}
+	rem, err := r.Remote("origin")
+	if err != nil {
+		return filepath.Base(repo), nil
+	}
+	urls := rem.Config().URLs
+	if len(urls) == 0 {
+		return filepath.Base(repo), nil
+	}
+	u := strings.TrimSuffix(strings.TrimSuffix(urls[0], "/"), ".git")
+	return path.Base(strings.ReplaceAll(u, "\\", "/")), nil
+}
@@ -0,0 +1,243 @@
+package gitlog
+
+import (
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/config"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+func TestLogReadsCommitsWithoutGitBinary(t *testing.T) {
+	dir := initRepo(t, []commitSpec{
+		{
+			when:    time.Date(2026, 8, 10, 12, 0, 0, 0, time.FixedZone("CEST", 3600)),
+			name:    "Ada Lovelace",
+			email:   "ada@example.com",
+			subject: "feat: first commit",
+			files:   map[string]string{"README.md": "hi\n", "src/main.c": "int main(){}\n"},
+		},
+		{
+			when:    time.Date(2026, 8, 11, 9, 30, 0, 0, time.FixedZone("CEST", 3600)),
+			name:    "Bob Babbage",
+			email:   "bob@example.com",
+			subject: "fix: typo",
+			files:   map[string]string{"docs/notes.md": "note\n"},
+		},
+	})
+
+	cs, err := Log(dir, Options{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 2 {
+		t.Fatalf("commits = %d, want 2", len(cs))
+	}
+	if cs[0].Subject != "fix: typo" {
+		t.Fatalf("head subject = %q, want fix: typo", cs[0].Subject)
+	}
+	if cs[1].Author != "Ada Lovelace" || cs[1].Email != "ada@example.com" {
+		t.Fatalf("author = %s <%s>", cs[1].Author, cs[1].Email)
+	}
+	sort.Strings(cs[1].Files)
+	if got := cs[1].Files; len(got) != 2 || got[0] != "README.md" || got[1] != "src/main.c" {
+		t.Fatalf("first commit files = %v", got)
+	}
+	if cs[0].Files[0] != "docs/notes.md" {
+		t.Fatalf("second commit files = %v", cs[0].Files)
+	}
+}
+
+func TestLogSkipsMerges(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "base", files: map[string]string{"a.txt": "a\n"},
+	}})
+	r, err := git.PlainOpen(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	head, err := r.Head()
+	if err != nil {
+		t.Fatal(err)
+	}
+	c, err := r.CommitObject(head.Hash())
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Second parent: duplicate the same tree so we do not need a real branch.
+	merge := &object.Commit{
+		Author:       object.Signature{Name: "Ada Lovelace", Email: "ada@example.com", When: time.Now()},
+		Committer:    object.Signature{Name: "Ada Lovelace", Email: "ada@example.com", When: time.Now()},
+		Message:      "merge",
+		TreeHash:     c.TreeHash,
+		ParentHashes: []plumbing.Hash{c.Hash, c.Hash},
+	}
+	obj := r.Storer.NewEncodedObject()
+	if err := merge.Encode(obj); err != nil {
+		t.Fatal(err)
+	}
+	h, err := r.Storer.SetEncodedObject(obj)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := r.Storer.SetReference(plumbing.NewHashReference(head.Name(), h)); err != nil {
+		t.Fatal(err)
+	}
+
+	cs, err := Log(dir, Options{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, x := range cs {
+		if x.Subject == "merge" {
+			t.Fatal("merge commit was not skipped")
+		}
+	}
+	if len(cs) != 1 || cs[0].Subject != "base" {
+		t.Fatalf("after skip merges: %+v", subjects(cs))
+	}
+}
+
+func TestLogSinceAndLimit(t *testing.T) {
+	old := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
+	neu := time.Date(2026, 6, 1, 0, 0, 0, 0, time.UTC)
+	dir := initRepo(t, []commitSpec{
+		{when: old, name: "Ada Lovelace", email: "ada@example.com", subject: "old", files: map[string]string{"old.md": "x"}},
+		{when: neu, name: "Ada Lovelace", email: "ada@example.com", subject: "new", files: map[string]string{"new.md": "y"}},
+	})
+	cs, err := Log(dir, Options{Since: neu.Add(-time.Hour)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 1 || cs[0].Subject != "new" {
+		t.Fatalf("since filter: %v", subjects(cs))
+	}
+	cs, err = Log(dir, Options{Limit: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 1 {
+		t.Fatalf("limit=1 got %d", len(cs))
+	}
+}
+
+func TestLeafShape(t *testing.T) {
+	c := Commit{
+		SHA:     "a1b2c3d4e5f6aaaa",
+		Author:  "Ada Lovelace",
+		Email:   "ada@example.com",
+		Date:    "2026-08-10T12:00:00+01:00",
+		Subject: "feat: first commit",
+		Files:   []string{"README.md", "src/main.c"},
+	}
+	lf := ToLeaf(c, "sample-repo")
+	if lf.Type != "commit" || lf.Repo != "sample-repo" {
+		t.Fatalf("leaf meta = %+v", lf)
+	}
+	if lf.Source != "sample-repo@a1b2c3d4e5f6aaaa" {
+		t.Fatalf("source = %s", lf.Source)
+	}
+	if lf.Related != "README.md,src/main.c" {
+		t.Fatalf("related = %s", lf.Related)
+	}
+	if lf.Heading != "commit a1b2c3d4e5f6 — feat: first commit" {
+		t.Fatalf("heading = %q", lf.Heading)
+	}
+	if !strings.Contains(lf.Text, "Ada Lovelace") || !strings.Contains(lf.Text, "README.md") {
+		t.Fatalf("text = %s", lf.Text)
+	}
+}
+
+func TestRepoNameFromOrigin(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "init", files: map[string]string{"README.md": "x"},
+	}})
+	r, err := git.PlainOpen(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := r.CreateRemote(&config.RemoteConfig{
+		Name: "origin",
+		URLs: []string{"https://git.example.com/eSlider/sample-repo.git"},
+	}); err != nil {
+		t.Fatal(err)
+	}
+	name, err := RepoName(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if name != "sample-repo" {
+		t.Fatalf("RepoName = %q, want sample-repo", name)
+	}
+}
+
+func TestRepoNameFallsBackToDir(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "init", files: map[string]string{"README.md": "x"},
+	}})
+	name, err := RepoName(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if name != filepath.Base(dir) {
+		t.Fatalf("RepoName = %q, want %s", name, filepath.Base(dir))
+	}
+}
+
+type commitSpec struct {
+	when    time.Time
+	name    string
+	email   string
+	subject string
+	files   map[string]string
+}
+
+func initRepo(t *testing.T, specs []commitSpec) string {
+	t.Helper()
+	dir := t.TempDir()
+	r, err := git.PlainInit(dir, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	w, err := r.Worktree()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, s := range specs {
+		for path, body := range s.files {
+			full := filepath.Join(dir, path)
+			if err := os.MkdirAll(filepath.Dir(full), 0o755); err != nil && !os.IsExist(err) {
+				t.Fatal(err)
+			}
+			if err := os.WriteFile(full, []byte(body), 0o644); err != nil {
+				t.Fatal(err)
+			}
+			if _, err := w.Add(path); err != nil {
+				t.Fatal(err)
+			}
+		}
+		if _, err := w.Commit(s.subject, &git.CommitOptions{
+			Author: &object.Signature{Name: s.name, Email: s.email, When: s.when},
+		}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	return dir
+}
+
+func subjects(cs []Commit) []string {
+	out := make([]string, len(cs))
+	for i, c := range cs {
+		out[i] = c.Subject
+	}
+	return out
+}