Printing Press Amend

/printing-press-amend

Turn a dogfood session into a PR for a printed CLI in the public library.

/printing-press-amend                 # auto-detect target CLI from session
/printing-press-amend superhuman      # explicit short name
/printing-press-amend superhuman-pp-cli
/printing-press-amend "$PRESS_LIBRARY/superhuman"

This skill lives in this repo (the machine) and acts on a printed CLI in the public library. It is sibling to /printing-press-publish (adds a new CLI), /printing-press-polish (improves a CLI pre-publish), and /printing-press-retro (reflects on the machine itself). None of those cover post-publish CLI amendments driven by real-session friction.

The artifact this skill produces is semantically a "patch" (in the git/PR sense), tracked by the public library's .printing-press-patches/ directory (one file per patch). Inline // PATCH(...) source comments are optional navigation aids when they make a customized site easier to grep. The slash-skill name is amend to disambiguate from the existing cli-printing-press patch binary subcommand (which AST-injects pre-defined features — different mechanism, different intent).

Setup

Before doing anything else:

<!-- PRESS_SETUP_CONTRACT_START -->

# min-binary-version: 4.0.0

# Derive scope first — needed for local build detection
_scope_dir="$(git rev-parse --show-toplevel 2>/dev/null || echo "$PWD")"
_scope_dir="$(cd "$_scope_dir" && pwd -P)"

# Prefer local build when running from inside the printing-press repo.
_press_repo=false
if [ -x "$_scope_dir/cli-printing-press" ] && [ -d "$_scope_dir/cmd/cli-printing-press" ]; then
  _press_repo=true
  export PATH="$_scope_dir:$PATH"
  echo "Using local build: $_scope_dir/cli-printing-press"
elif ! command -v cli-printing-press >/dev/null 2>&1; then
  if [ -x "$HOME/go/bin/cli-printing-press" ]; then
    echo "cli-printing-press found at ~/go/bin/cli-printing-press but not on PATH."
    echo "Add GOPATH/bin to your PATH:  export PATH=\"\$HOME/go/bin:\$PATH\""
  else
    echo "cli-printing-press binary not found."
    echo "Install with:  go install github.com/mvanhorn/cli-printing-press/v4/cmd/cli-printing-press@latest"
  fi
  return 1 2>/dev/null || exit 1
fi

# Resolve and emit the absolute path the agent must use for every later
# `cli-printing-press` invocation. `export PATH` above only affects this one
# Bash tool call; subsequent calls open a fresh shell and resolve bare
# `cli-printing-press` against the user's default PATH, where a stale global
# can silently shadow the local build. The agent captures this marker and
# substitutes the absolute path into every later invocation.
if [ "$_press_repo" = "true" ]; then
  PRINTING_PRESS_BIN="$_scope_dir/cli-printing-press"
else
  PRINTING_PRESS_BIN="$(command -v cli-printing-press 2>/dev/null || true)"
fi
if ! command -v go >/dev/null 2>&1; then
  echo ""
  echo "[setup-error] Go toolchain not found."
  echo ""
  echo "This Printing Press flow runs Go-based build or validation commands."
  echo "Install Go 1.26.6 or newer from https://go.dev/dl/, then verify with:"
  echo "  go version"
  echo "Then re-run this skill."
  echo ""
  return 1 2>/dev/null || exit 1
fi
echo "PRINTING_PRESS_BIN=$PRINTING_PRESS_BIN"

_pp_semver_lt() {
  if [ -z "${PP_SEMVER_A:-}" ] || [ -z "${PP_SEMVER_B:-}" ]; then
    echo "[setup-error] semver comparison inputs are missing." >&2
    return 2
  fi
  awk -v a="${PP_SEMVER_A:-}" -v b="${PP_SEMVER_B:-}" 'BEGIN {
    split(a, x, "."); split(b, y, ".")
    for (i = 1; i <= 3; i++) {
      if ((x[i] + 0) < (y[i] + 0)) exit 0
      if ((x[i] + 0) > (y[i] + 0)) exit 1
    }
    exit 1
  }'
}

_pp_go_version_norm() {
  printf '%s\n' "${PP_GO_VERSION_INPUT:-}" | sed -nE 's/.*go([0-9]+)\.([0-9]+)(\.([0-9]+))?.*/\1.\2.\4/p' | sed -E 's/\.$/.0/'
}

_pp_check_go_currency() {
  _pp_go_installed="$(PP_GO_VERSION_INPUT="$(go env GOVERSION 2>/dev/null)" _pp_go_version_norm)"
  _pp_go_required="$(PP_GO_VERSION_INPUT="$(go version "$PRINTING_PRESS_BIN" 2>/dev/null)" _pp_go_version_norm)"
  PP_SEMVER_A="$_pp_go_installed"
  PP_SEMVER_B="$_pp_go_required"
  if [ -z "$_pp_go_installed" ] || [ -z "$_pp_go_required" ] || ! _pp_semver_lt; then
    return 0
  fi

  echo ""
  if [ "${GOTOOLCHAIN:-auto}" = "local" ]; then
    echo "[setup-error] Go $_pp_go_required or newer is required by this cli-printing-press binary (installed: $_pp_go_installed)."
    echo "GOTOOLCHAIN=local disables automatic toolchain downloads, so later Go quality gates would fail."
    echo "Install Go $_pp_go_required or newer from https://go.dev/dl/, or unset GOTOOLCHAIN."
    echo ""
    return 1
  fi

  echo "[go-toolchain-old] Go $_pp_go_required or newer is required by this cli-printing-press binary (installed: $_pp_go_installed)."
  echo "PRESS_GO_INSTALLED=$_pp_go_installed"
  echo "PRESS_GO_REQUIRED=$_pp_go_required"
  echo "Default GOTOOLCHAIN behavior may download the required toolchain during Go commands."
  echo ""
  return 0
}
_pp_check_go_currency || { return 1 2>/dev/null || exit 1; }

PRESS_BASE="$(basename "$_scope_dir" | tr '[:upper:]' '[:lower:]' | sed -E 's/[^a-z0-9_-]/-/g; s/^-+//; s/-+$//')"
if [ -z "$PRESS_BASE" ]; then
  PRESS_BASE="workspace"
fi

PRESS_SCOPE="$PRESS_BASE-$(printf '%s' "$_scope_dir" | shasum -a 256 | cut -c1-8)"
PRESS_HOME="${PRINTING_PRESS_HOME:-$HOME/printing-press}"
PRESS_RUNSTATE="$PRESS_HOME/.runstate/$PRESS_SCOPE"
PRESS_LIBRARY="$PRESS_HOME/library"
PRESS_MANUSCRIPTS="$PRESS_HOME/manuscripts"
PRESS_CURRENT="$PRESS_RUNSTATE/current"

_pp_check_disk_space() {
  _pp_disk_warn_kb="${PRINTING_PRESS_DISK_WARN_KB:-3145728}"
  _pp_disk_fail_kb="${PRINTING_PRESS_DISK_FAIL_KB:-524288}"
  case "$_pp_disk_warn_kb$_pp_disk_fail_kb" in
    ""|*[!0-9]*) return 0 ;;
  esac

  _pp_disk_path="$PRESS_HOME"
  while [ ! -e "$_pp_disk_path" ] && [ "$_pp_disk_path" != "/" ]; do
    _pp_disk_path="$(dirname "$_pp_disk_path")"
  done

  _pp_disk_avail_kb="$(df -Pk "$_pp_disk_path" 2>/dev/null | awk 'BEGIN {
    if ((getline header) <= 0 || (getline record) <= 0) exit
    field_count = split(record, fields)
    if (field_count >= 4) print fields[4]
  }')"
  case "$_pp_disk_avail_kb" in
    ""|*[!0-9]*) return 0 ;;
  esac

  if [ "$_pp_disk_avail_kb" -lt "$_pp_disk_fail_kb" ]; then
    echo ""
    echo "[setup-error] Critically low disk space on the Printing Press workspace volume."
    echo "PRESS_DISK_PATH=$_pp_disk_path"
    echo "PRESS_DISK_AVAIL_KB=$_pp_disk_avail_kb"
    echo "PRESS_DISK_FAIL_KB=$_pp_disk_fail_kb"
    echo "Free disk space or set PRINTING_PRESS_HOME to a volume with more room, then re-run this skill."
    echo ""
    return 1
  fi

  if [ "$_pp_disk_avail_kb" -lt "$_pp_disk_warn_kb" ]; then
    echo ""
    echo "[low-disk] Printing Press workspace volume is low on free space."
    echo "PRESS_DISK_PATH=$_pp_disk_path"
    echo "PRESS_DISK_AVAIL_KB=$_pp_disk_avail_kb"
    echo "PRESS_DISK_WARN_KB=$_pp_disk_warn_kb"
    echo "This flow may need several GiB for generated files, Go build cache, module downloads, or repository clones."
    echo ""
  fi
}
_pp_check_disk_space || { return 1 2>/dev/null || exit 1; }

mkdir -p "$PRESS_RUNSTATE" "$PRESS_LIBRARY" "$PRESS_MANUSCRIPTS" "$PRESS_CURRENT"

# --- Currency-floor check (standalone, fail-open) ---
# Hard-stop on binaries below the published supported floor so amend does not
# regenerate CLIs with since-fixed bugs. Repo checkouts build from source and
# are exempt. The floor is clamped to <= latest so a bad value cannot brick
# every install. Fetched fresh each run rather than reusing the printing-press
# preflight's TTL cache: amend is low-frequency, so the bounded curl + go-list
# cost is not worth its own cache here.
if [ "$_press_repo" != "true" ] && command -v curl >/dev/null 2>&1; then
  _semver_lt() {
    if [ -z "${PP_SEMVER_A:-}" ] || [ -z "${PP_SEMVER_B:-}" ]; then
      echo "[setup-error] semver comparison inputs are missing." >&2
      return 2
    fi