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#!/usr/bin/env bash
# scripts/fetch_deps.sh
# Idempotent dependency fetcher for BoltDBG.
# - clones lightweight (shallow) tagged commits into external/
# - safe to run repeatedly
# - respects GIT_CLONE_DEPTH and DRY_RUN env vars
#
# Defaults can be overridden via environment variables:
# DRY_RUN=1 (don't actually clone)
# GIT_CLONE_DEPTH=1 (use 0 for full clone)
# IMGUITAG=... GLFWTAG=... SPDLOGTAG=... GLADTAG=...
#
# Examples:
# ./scripts/fetch_deps.sh
# DRY_RUN=1 ./scripts/fetch_deps.sh
# IMGUITAG=v1.89.8 ./scripts/fetch_deps.sh
set -euo pipefail
# Configurable env vars with sane defaults
: "${DRY_RUN:=0}"
: "${GIT_CLONE_DEPTH:=1}" # 1 = shallow, 0 = full clone
ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
EXTERNAL_DIR="${ROOT_DIR}/external"
# Repos & tags (pin here; override with env)
IMGUI_REPO="https://github.com/ocornut/imgui.git"
IMGUI_TAG="${IMGUITAG:-v1.89.8}"
GLFW_REPO="https://github.com/glfw/glfw.git"
GLFW_TAG="${GLFWTAG:-3.3.8}"
SPDLOG_REPO="https://github.com/gabime/spdlog.git"
SPDLOG_TAG="${SPDLOGTAG:-v1.11.0}"
GLAD_REPO="https://github.com/Dav1dde/glad.git"
GLAD_TAG="${GLADTAG:-v0.1.36}"
# Helper utils
echo_header() {
echo "================================================================="
echo "$*"
echo "-----------------------------------------------------------------"
}
require_cmd() {
if ! command -v "$1" >/dev/null 2>&1; then
echo "ERROR: required command '$1' not found in PATH. Install it and retry."
exit 2
fi
}
# Check prerequisites (git required to clone)
require_cmd git
# Prepare external dir
mkdir -p "${EXTERNAL_DIR}"
# normalize depth option for git clone
git_depth_arg=()
if [ "${GIT_CLONE_DEPTH}" != "0" ]; then
git_depth_arg=(--depth "${GIT_CLONE_DEPTH}")
fi
# Clone helper: idempotent and safe
clone_if_missing() {
local target_dir="$1"; shift
local repo="$1"; shift
local tag="$1"; shift
# If exists and is a git repo, skip
if [ -d "${target_dir}" ] && [ -d "${target_dir}/.git" ]; then
echo ">>> ${target_dir} already exists and is a git repo. Skipping."
return 0
fi
# If exists but not a git repo, avoid overwriting
if [ -d "${target_dir}" ] && [ ! -d "${target_dir}/.git" ]; then
echo ">>> ${target_dir} exists but is not a git repo. Skipping to avoid overwrite."
return 0
fi
# Dry-run mode: just print what would be done
if [ "${DRY_RUN}" = "1" ]; then
echo "[DRY RUN] git clone ${git_depth_arg[*]} --branch ${tag} ${repo} ${target_dir}"
return 0
fi
# Attempt clone; if tag isn't found, try fallback to branch/commit directly
echo "Cloning ${repo} (ref=${tag}) into ${target_dir} (depth=${GIT_CLONE_DEPTH:-full})..."
set +e
git clone "${git_depth_arg[@]}" --branch "${tag}" "${repo}" "${target_dir}"
rc=$?
set -e
if [ $rc -ne 0 ]; then
echo "Warning: clone with --branch ${tag} failed, attempting clone of default branch then checkout..."
git clone "${git_depth_arg[@]}" "${repo}" "${target_dir}"
(
cd "${target_dir}"
# try to checkout tag/commit; ignore failures but warn
if ! git checkout "${tag}"; then
echo "Warning: could not checkout '${tag}' in ${target_dir}; repository left on default branch."
fi
)
fi
echo "Cloned ${repo} -> ${target_dir}"
}
# Small network check (best-effort)
check_network() {
if command -v curl >/dev/null 2>&1; then
curl -fsS --max-time 5 https://github.com >/dev/null 2>&1 || {
echo "WARNING: network check to github.com failed. If you are offline, fetch will fail."
}
elif command -v ping >/dev/null 2>&1; then
ping -c1 github.com >/dev/null 2>&1 || {
echo "WARNING: unable to ping github.com. If you are offline, fetch will fail."
}
fi
}
# Begin
echo_header "BoltDBG: fetching external dependencies into ${EXTERNAL_DIR}"
echo "DRY_RUN=${DRY_RUN} GIT_CLONE_DEPTH=${GIT_CLONE_DEPTH}"
echo "Pins: IMGUITAG=${IMGUI_TAG} GLFWTAG=${GLFW_TAG} SPDLOGTAG=${SPDLOG_TAG} GLADTAG=${GLAD_TAG}"
echo
check_network
# --- Clone sequence (order chosen to satisfy typical needs) ---
# ImGui: we want core + backends (we will keep repo as-is)
IMGUI_DIR="${EXTERNAL_DIR}/imgui"
clone_if_missing "${IMGUI_DIR}" "${IMGUI_REPO}" "${IMGUI_TAG}"
# GLFW: vendor if missing (many systems provide system package)
GLFW_DIR="${EXTERNAL_DIR}/glfw"
clone_if_missing "${GLFW_DIR}" "${GLFW_REPO}" "${GLFW_TAG}"
# spdlog: logging library
SPDLOG_DIR="${EXTERNAL_DIR}/spdlog"
clone_if_missing "${SPDLOG_DIR}" "${SPDLOG_REPO}" "${SPDLOG_TAG}"
# glad: OpenGL loader (optional but recommended)
GLAD_DIR="${EXTERNAL_DIR}/glad"
clone_if_missing "${GLAD_DIR}" "${GLAD_REPO}" "${GLAD_TAG}"
# Optional: prune heavy demo directories for space (shallow clones make this minor)
# e.g. remove example heavy files from imgui if you want:
if [ "${DRY_RUN}" != "1" ]; then
# If a full clone was used, consider removing unnecessary files (uncomment if desired)
# find "${IMGUI_DIR}" -name 'examples' -type d -exec rm -rf {} +
:
fi
echo
echo_header "Done"
echo "Fetched dependencies are placed under ${EXTERNAL_DIR}."
echo "Note: external/ should be listed in .gitignore so these sources are not committed."
echo "If you prefer FetchContent at configure-time, CMake fallback will handle it automatically."
echo
echo "Tip: To force re-fetch (fresh clone), remove the target dir and run again:"
echo " rm -rf ${EXTERNAL_DIR}/imgui ${EXTERNAL_DIR}/glfw ${EXTERNAL_DIR}/spdlog ${EXTERNAL_DIR}/glad && ./scripts/fetch_deps.sh"
echo_header "Finished fetching deps"
exit 0
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