1#!/bin/sh
2# planning-with-files: resolve active plan directory.
3#
4# Resolution order:
5#   1. $PLAN_ID env var → ./.planning/$PLAN_ID/ if exists
6#   2. ./.planning/.active_plan content → matching dir if exists
7#   3. Newest ./.planning/<dir>/ by mtime
8#   4. Otherwise empty stdout (caller falls back to legacy ./task_plan.md)
9#
10# Always exits 0. Never errors out the agent loop.
11#
12# Usage:
13#   PLAN_DIR="$(sh scripts/resolve-plan-dir.sh)"
14#   PLAN_FILE="${PLAN_DIR:+$PLAN_DIR/}task_plan.md"
15 
16set -u
17 
18PLAN_ROOT="${1:-${PWD}/.planning}"
19ACTIVE_FILE="${PLAN_ROOT}/.active_plan"
20 
21resolve_from_env() {
22    plan_id="${PLAN_ID:-}"
23    [ -z "${plan_id}" ] && return 1
24    candidate="${PLAN_ROOT}/${plan_id}"
25    if [ -d "${candidate}" ]; then
26        printf "%s\n" "${candidate}"
27        return 0
28    fi
29    return 1
30}
31 
32resolve_from_active_file() {
33    [ -f "${ACTIVE_FILE}" ] || return 1
34    plan_id="$(tr -d '\r\n' < "${ACTIVE_FILE}")"
35    [ -z "${plan_id}" ] && return 1
36    candidate="${PLAN_ROOT}/${plan_id}"
37    if [ -d "${candidate}" ]; then
38        printf "%s\n" "${candidate}"
39        return 0
40    fi
41    return 1
42}
43 
44resolve_latest_dir() {
45    [ -d "${PLAN_ROOT}" ] || return 1
46    # Portable newest-mtime selector. Avoid `ls -t` BSD/GNU drift.
47    # Only consider dirs that contain task_plan.md — skips system dirs like sessions/.
48    latest=""
49    latest_mtime=0
50    for entry in "${PLAN_ROOT}"/*/; do
51        [ -d "${entry}" ] || continue
52        # Strip trailing slash
53        clean="${entry%/}"
54        # Skip hidden dirs
55        case "$(basename "${clean}")" in
56            .*) continue ;;
57        esac
58        # Skip dirs that are not plan dirs
59        [ -f "${clean}/task_plan.md" ] || continue
60        mtime="$(date -r "${clean}" +%s 2>/dev/null || stat -c '%Y' "${clean}" 2>/dev/null || echo 0)"
61        if [ "${mtime}" -gt "${latest_mtime}" ] 2>/dev/null; then
62            latest_mtime="${mtime}"
63            latest="${clean}"
64        fi
65    done
66    if [ -n "${latest}" ]; then
67        printf "%s\n" "${latest}"
68        return 0
69    fi
70    return 1
71}
72 
73if resolve_from_env; then exit 0; fi
74if resolve_from_active_file; then exit 0; fi
75if resolve_latest_dir; then exit 0; fi
76exit 0
77