gh

#!/bin/bash
# Copyright 2026 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

# Wrapper script to run gh-ish with prebuilt caching by Git commit hash.
#
# If the current Git commit hash matches the saved hash of the prebuilt binary,
# it executes the prebuilt directly with zero Bazel startup overhead. If the hash
# changed or the prebuilt does not exist, it builds //pw_ghish:gh-ish via
# bazelisk and caches the resulting binary.

set -e

if test -n "$BASH"; then
  declare -r _PW_SCRIPT_DIR=$(readlink -f "$(dirname "${BASH_SOURCE[0]}")")
elif test -n "$ZSH_NAME"; then
  declare -r _PW_SCRIPT_DIR="${0:h:A}"
else
  declare -r _PW_SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
fi

export BAZELISK_SKIP_WRAPPER=1

if [ -d "${_PW_SCRIPT_DIR}/environment/cipd/packages/bazelisk" ]; then
  export PATH="${_PW_SCRIPT_DIR}/environment/cipd/packages/bazelisk:${PATH}"
elif [ -d "$HOME/bin" ]; then
  export PATH="$HOME/bin:${PATH}"
fi

# Prebuilt cache directory (defaults to out/gh, which is .gitignored in Pigweed).
declare -r _GH_DIR="${_PW_GH_OUT_DIR:-${_PW_SCRIPT_DIR}/out/gh}"
declare -r _GH_BIN="${_GH_DIR}/gh-ish"
declare -r _GH_HASH_FILE="${_GH_DIR}/git_hash"

_CURRENT_HASH=$(git -C "$_PW_SCRIPT_DIR" rev-parse HEAD 2>/dev/null || true)
if [ -z "$_CURRENT_HASH" ] && [ -n "${PW_GH_DEBUG:-}" ]; then
  echo "Warning: git rev-parse HEAD failed in $_PW_SCRIPT_DIR; caching disabled." >&2
fi

_STALE=1
_DIRTY=$(git -C "$_PW_SCRIPT_DIR" status --porcelain -- pw_ghish 2>/dev/null || true)
if [ -z "${PW_GH_FORCE_BUILD:-}" ] && [ -z "$_DIRTY" ] && [ -f "$_GH_BIN" ] && [ -f "$_GH_HASH_FILE" ] && [ -n "$_CURRENT_HASH" ]; then
  _SAVED_HASH=$(cat "$_GH_HASH_FILE" 2>/dev/null || true)
  if [ "$_CURRENT_HASH" = "$_SAVED_HASH" ]; then
    _STALE=0
  fi
fi

if [ $_STALE -eq 1 ]; then
  if [ -t 1 ]; then
    if [ -n "$_DIRTY" ]; then
      printf " ⏱  Building gh-ish (local uncommitted changes in pw_ghish)...\n"
    else
      printf " ⏱  Building gh-ish (commit %.8s)...\n" "${_CURRENT_HASH:-unknown}"
    fi
  fi

  (
    cd "$_PW_SCRIPT_DIR"
    bazelisk build \
      --noshow_progress \
      --noshow_loading_progress \
      //pw_ghish:gh-ish
  )

  _BUILT_BIN="${_PW_SCRIPT_DIR}/bazel-bin/pw_ghish/gh-ish_/gh-ish"
  if [ ! -f "$_BUILT_BIN" ]; then
    _BUILT_BIN="${_PW_SCRIPT_DIR}/bazel-bin/pw_ghish/gh-ish"
  fi
  if [ ! -f "$_BUILT_BIN" ]; then
    echo "Error: built binary not found at $_BUILT_BIN" >&2
    exit 1
  fi

  mkdir -p "$_GH_DIR"
  cp -f "$_BUILT_BIN" "$_GH_BIN"
  chmod +x "$_GH_BIN"
  if [ -n "$_CURRENT_HASH" ] && [ -z "$_DIRTY" ]; then
    echo "$_CURRENT_HASH" > "$_GH_HASH_FILE"
  else
    rm -f "$_GH_HASH_FILE"
  fi
fi

export BUILD_WORKSPACE_DIRECTORY="${_PW_SCRIPT_DIR}"
export BUILD_WORKING_DIRECTORY="${PWD}"
exec "$_GH_BIN" "$@"