#!/bin/bash
set -euo pipefail

TOOLS_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

TOOLS_SRC_DIR="$TOOLS_DIR/src"
TOOLS_MK="$TOOLS_DIR/Variables.mk"

echo "# Generated tool paths" > "$TOOLS_MK"

cat <<'EOL' >> "$TOOLS_MK"
tools_dir := $(shell cd $(dir $(lastword $(MAKEFILE_LIST))) && pwd)
src_dir := $(tools_dir)/src

# Due to a race condition, after initial call to `go tool` golang may report a wrong binary location pointing to the invalid `/tmp/go-buildXXX` directory
define compile_tool
$(shell \
  (cd $(src_dir)/$(1) \
  && GOWORK=off go tool -n $(2) > /dev/null \
  && GOWORK=off go tool -n $(2)) | sed 's/^[[:space:]]*//g'; \
)
endef

EOL

for tooldir in "$TOOLS_SRC_DIR"/*; do
  [ -d "$tooldir" ] || continue
  tool=$(basename "$tooldir")
  fqtn=$(awk '/^tool / { print $2 }' "$tooldir/go.mod")

  cat <<EOL >> "$TOOLS_MK"

# Tool: "$tool"
${tool} = "\$(call compile_tool,${tool},${fqtn})"
EOL
done