#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Codex Session Start Hook - Inject Trellis context into Codex sessions.
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Output format follows Codex hook protocol:
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stdout JSON → { hookSpecificOutput: { hookEventName: "SessionStart", additionalContext: "..." } }
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"""
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from __future__ import annotations
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import json
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import os
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import subprocess
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import sys
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import warnings
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from io import StringIO
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from pathlib import Path
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warnings.filterwarnings("ignore")
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def should_skip_injection() -> bool:
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return os.environ.get("CODEX_NON_INTERACTIVE") == "1"
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def read_file(path: Path, fallback: str = "") -> str:
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try:
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return path.read_text(encoding="utf-8")
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except (FileNotFoundError, PermissionError):
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return fallback
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def run_script(script_path: Path) -> str:
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try:
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env = os.environ.copy()
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env["PYTHONIOENCODING"] = "utf-8"
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cmd = [sys.executable, "-W", "ignore", str(script_path)]
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result = subprocess.run(
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cmd,
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capture_output=True,
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text=True,
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encoding="utf-8",
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errors="replace",
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timeout=5,
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cwd=str(script_path.parent.parent.parent),
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env=env,
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)
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return result.stdout if result.returncode == 0 else "No context available"
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except (subprocess.TimeoutExpired, FileNotFoundError, PermissionError):
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return "No context available"
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def _normalize_task_ref(task_ref: str) -> str:
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normalized = task_ref.strip()
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if not normalized:
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return ""
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path_obj = Path(normalized)
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if path_obj.is_absolute():
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return str(path_obj)
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normalized = normalized.replace("\\", "/")
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while normalized.startswith("./"):
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normalized = normalized[2:]
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if normalized.startswith("tasks/"):
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return f".trellis/{normalized}"
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return normalized
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def _resolve_task_dir(trellis_dir: Path, task_ref: str) -> Path:
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normalized = _normalize_task_ref(task_ref)
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path_obj = Path(normalized)
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if path_obj.is_absolute():
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return path_obj
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if normalized.startswith(".trellis/"):
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return trellis_dir.parent / path_obj
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return trellis_dir / "tasks" / path_obj
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def _get_task_status(trellis_dir: Path) -> str:
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current_task_file = trellis_dir / ".current-task"
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if not current_task_file.is_file():
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return "Status: NO ACTIVE TASK\nNext: Describe what you want to work on"
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task_ref = _normalize_task_ref(current_task_file.read_text(encoding="utf-8").strip())
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if not task_ref:
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return "Status: NO ACTIVE TASK\nNext: Describe what you want to work on"
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task_dir = _resolve_task_dir(trellis_dir, task_ref)
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if not task_dir.is_dir():
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return f"Status: STALE POINTER\nTask: {task_ref}\nNext: Task directory not found. Run: python3 ./.trellis/scripts/task.py finish"
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task_json_path = task_dir / "task.json"
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task_data: dict = {}
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if task_json_path.is_file():
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try:
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task_data = json.loads(task_json_path.read_text(encoding="utf-8"))
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except (json.JSONDecodeError, PermissionError):
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pass
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task_title = task_data.get("title", task_ref)
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task_status = task_data.get("status", "unknown")
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if task_status == "completed":
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return f"Status: COMPLETED\nTask: {task_title}\nNext: Archive with `python3 ./.trellis/scripts/task.py archive {task_dir.name}` or start a new task"
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has_context = False
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for jsonl_name in ("implement.jsonl", "check.jsonl", "spec.jsonl"):
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jsonl_path = task_dir / jsonl_name
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if jsonl_path.is_file() and jsonl_path.stat().st_size > 0:
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has_context = True
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break
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has_prd = (task_dir / "prd.md").is_file()
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if not has_prd:
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return f"Status: NOT READY\nTask: {task_title}\nMissing: prd.md not created\nNext: Write PRD, then research → init-context → start"
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if not has_context:
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return f"Status: NOT READY\nTask: {task_title}\nMissing: Context not configured (no jsonl files)\nNext: Complete Phase 2 (research → init-context → start) before implementing"
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return f"Status: READY\nTask: {task_title}\nNext: Continue with implement or check"
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def _build_workflow_toc(workflow_path: Path) -> str:
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"""Build a compact section index for workflow.md (lazy-load the full file on demand).
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Replaces full-file injection to keep additionalContext payload small.
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The full file is accessible via: Read tool on .trellis/workflow.md
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"""
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content = read_file(workflow_path)
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if not content:
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return "No workflow.md found"
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toc_lines = [
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"# Development Workflow — Section Index",
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"Full guide: .trellis/workflow.md (read on demand)",
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"",
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]
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for line in content.splitlines():
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if line.startswith("## "):
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toc_lines.append(line)
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toc_lines += [
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"",
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"To read a section: use the Read tool on .trellis/workflow.md",
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]
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return "\n".join(toc_lines)
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def main() -> None:
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if should_skip_injection():
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sys.exit(0)
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# Read hook input from stdin
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try:
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hook_input = json.loads(sys.stdin.read())
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project_dir = Path(hook_input.get("cwd", ".")).resolve()
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except (json.JSONDecodeError, KeyError):
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project_dir = Path(".").resolve()
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trellis_dir = project_dir / ".trellis"
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output = StringIO()
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output.write("""<session-context>
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You are starting a new session in a Trellis-managed project.
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Read and follow all instructions below carefully.
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</session-context>
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""")
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output.write("<current-state>\n")
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context_script = trellis_dir / "scripts" / "get_context.py"
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output.write(run_script(context_script))
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output.write("\n</current-state>\n\n")
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output.write("<workflow>\n")
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output.write(_build_workflow_toc(trellis_dir / "workflow.md"))
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output.write("\n</workflow>\n\n")
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output.write("<guidelines>\n")
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output.write("**Note**: The guidelines below are index files — they list available guideline documents and their locations.\n")
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output.write("During actual development, you MUST read the specific guideline files listed in each index's Pre-Development Checklist.\n\n")
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spec_dir = trellis_dir / "spec"
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if spec_dir.is_dir():
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for sub in sorted(spec_dir.iterdir()):
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if not sub.is_dir() or sub.name.startswith("."):
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continue
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if sub.name == "guides":
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index_file = sub / "index.md"
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if index_file.is_file():
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output.write(f"## {sub.name}\n")
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output.write(read_file(index_file))
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output.write("\n\n")
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continue
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index_file = sub / "index.md"
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if index_file.is_file():
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output.write(f"## {sub.name}\n")
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output.write(read_file(index_file))
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output.write("\n\n")
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else:
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for nested in sorted(sub.iterdir()):
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if not nested.is_dir():
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continue
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nested_index = nested / "index.md"
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if nested_index.is_file():
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output.write(f"## {sub.name}/{nested.name}\n")
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output.write(read_file(nested_index))
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output.write("\n\n")
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output.write("</guidelines>\n\n")
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task_status = _get_task_status(trellis_dir)
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output.write(f"<task-status>\n{task_status}\n</task-status>\n\n")
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output.write("""<ready>
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Context loaded. Workflow index, project state, and guidelines are already injected above — do NOT re-read them.
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Wait for the user's first message, then handle it following the workflow guide.
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If there is an active task, ask whether to continue it.
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</ready>""")
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context = output.getvalue()
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result = {
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"suppressOutput": True,
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"systemMessage": f"Trellis context injected ({len(context)} chars)",
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"hookSpecificOutput": {
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"hookEventName": "SessionStart",
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"additionalContext": context,
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},
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}
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print(json.dumps(result, ensure_ascii=False), flush=True)
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if __name__ == "__main__":
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main()
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