claude/lib/memory-commit.sh
Bastien Chanot bbef41cebf feat(lib): emit memory-commit hash on stdout + T6/T7 (stdout contract, idempotence)
commit_memory now routes diagnostics to stderr and prints ONLY the memory-commit
short hash to stdout, so the capitalize-commit include can report it. Proven:
- T6: commit→hash (matches independent rev-parse), no-op→empty, unsafe→empty+exit3.
- T7: double run creates exactly one commit (real run, not by construction).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W9sqAwZxBMZSynZoVrEJhd
2026-06-26 12:45:06 +02:00

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#!/usr/bin/env bash
# memory-commit.sh — surgically commit ONLY .claude/memory + .claude/tasks.
#
# Used by the dev-flow capitalize step (and, later, the v2 Stop hook) to couple
# the memory commit to the flow. Safety lives in the PATHSPEC, never in a human
# diff review — automation removes that review, so the scope must be airtight:
# code that happens to be dirty or staged is NEVER embarked.
#
# Usage (CLI):
# memory-commit.sh pending # exit 0 if memory/tasks have changes, 1 if clean
# memory-commit.sh commit "<message>" # surgical commit; exit 0 ok/no-op, 3 unsafe state
#
# Output contract for `commit`: diagnostics go to stderr; on a real commit the
# short hash of the MEMORY commit is the ONLY thing on stdout (empty on no-op or
# unsafe), so callers can capture it: `mem_hash=$(memory-commit.sh commit "msg")`.
#
# Sourceable: `memory_pending` and `commit_memory` for the v2 hook.
set -uo pipefail
MC_PATHS=(".claude/memory" ".claude/tasks")
_in_git_repo() { git rev-parse --git-dir >/dev/null 2>&1; }
# True (0) when the repo is in a state where we must NOT auto-commit:
# detached HEAD, or a merge/rebase/cherry-pick in progress.
_unsafe_state() {
local gitdir
gitdir="$(git rev-parse --git-dir 2>/dev/null)" || return 0
if [ -e "$gitdir/MERGE_HEAD" ] || [ -e "$gitdir/rebase-merge" ] ||
[ -e "$gitdir/rebase-apply" ] || [ -e "$gitdir/CHERRY_PICK_HEAD" ]; then
return 0
fi
git symbolic-ref -q HEAD >/dev/null 2>&1 || return 0 # detached HEAD
return 1
}
# Scoped paths that have actual pending changes. A bare/empty path (e.g. an
# empty .claude/tasks dir) is excluded: `git commit -- <pathspec>` aborts the
# WHOLE commit on a pathspec that matches no known file, even though `git add`
# tolerates it. So scope = only paths git would accept.
_changed_paths() {
local p
for p in "${MC_PATHS[@]}"; do
[ -e "$p" ] || continue
[ -n "$(git status --porcelain -- "$p" 2>/dev/null)" ] && printf '%s\n' "$p"
done
}
# 0 if something is pending under the scoped paths, 1 if clean / absent.
memory_pending() {
_in_git_repo || return 1
local changed
mapfile -t changed < <(_changed_paths)
[ "${#changed[@]}" -gt 0 ]
}
# Surgical commit of the scoped paths only. Returns 0 (ok or no-op), 3 (unsafe).
# On a real commit, prints the memory-commit short hash to stdout (stderr = diag).
commit_memory() {
local msg="${1:?commit message required}"
_in_git_repo || {
echo "memory-commit: not a git repo — skip" >&2
return 3
}
if _unsafe_state; then
echo "memory-commit: detached HEAD or merge/rebase in progress — skip (no commit)" >&2
return 3
fi
local changed
mapfile -t changed < <(_changed_paths)
if [ "${#changed[@]}" -eq 0 ]; then
echo "memory-commit: nothing pending — no-op" >&2
return 0
fi
# Re-stage working-tree content of the scoped paths over any stale index entry,
# then commit ONLY those paths. The pathspec on `git commit` makes it a partial
# commit: other staged files (dangling code) are not recorded.
git add -- "${changed[@]}"
if git diff --cached --quiet -- "${changed[@]}"; then
echo "memory-commit: only ignored/no-op changes — no-op" >&2
return 0
fi
# Contract: diagnostics go to stderr; on success ONLY the memory-commit short
# hash goes to stdout, so a caller can do `mem_hash=$(... commit "msg")`.
git commit -q -m "$msg" -- "${changed[@]}"
git rev-parse --short HEAD
}
main() {
local cmd="${1:-}"
case "$cmd" in
pending) memory_pending ;;
commit)
shift
commit_memory "${1:-}"
;;
*)
echo "usage: memory-commit.sh {pending | commit <message>}" >&2
return 2
;;
esac
}
# Run main only when executed, not when sourced.
if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
main "$@"
fi