#!/usr/bin/env sh
set -euo pipefail

ROOT="$(cd -- "$(dirname "$0")/.." && pwd)"
BIN_DIR="$ROOT/bin"
BIN="$BIN_DIR/img2pdf"
GOFLAGS_DEFAULT="-tags=wayland"
CGO_CFLAGS_DEFAULT="-D_GNU_SOURCE"

# Keep caches inside the repo to avoid $HOME permission issues.
export GOCACHE="${GOCACHE:-$ROOT/.cache/go-build}"
export GOMODCACHE="${GOMODCACHE:-$ROOT/.cache/go-mod}"
export GOFLAGS="${GOFLAGS:-$GOFLAGS_DEFAULT}"
export CGO_CFLAGS="${CGO_CFLAGS:-$CGO_CFLAGS_DEFAULT}"
export CGO_CXXFLAGS="${CGO_CXXFLAGS:-$CGO_CFLAGS}"
mkdir -p "$GOCACHE" "$GOMODCACHE" "$BIN_DIR"

patch_glfw_wayland() {
  # Drop the redundant _GNU_SOURCE define in GLFW's Wayland file to avoid macro redefinition warnings.
  local wl_file="$GOMODCACHE/github.com/go-gl/glfw/v3.3/glfw@v0.0.0-20221017161538-93cebf72946b/glfw/src/wl_window.c"
  if [ -f "$wl_file" ] && grep -q '^#define _GNU_SOURCE$' "$wl_file"; then
    chmod u+w "$wl_file"
    tmp="$(mktemp)"
    sed '/^#define _GNU_SOURCE$/d' "$wl_file" >"$tmp" && mv "$tmp" "$wl_file"
  fi
}

cd "$ROOT"
patch_glfw_wayland
go build -o "$BIN" ./cmd/img2pdf
echo "Built: $BIN"