#!/usr/bin/env sh

set -e

SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
cd "$SCRIPT_DIR/.."  # .custom-gcl.yaml is only discovered in the current directory

BIN="bin/golint"
STAMP="bin/.golint.stamp"

# Everything that changes the compiled binary: the linter sources, and the build
# config that pins the golangci-lint version the plugin links against. testdata
# is excluded -- fixtures are not compiled into the binary.
current_stamp() {
  {
    find pkg/ -type f ! -path '*/testdata/*' | sort | xargs sha256sum
    sha256sum .custom-gcl.yaml
    sha256sum root.go
  } | sha256sum | cut -d' ' -f1
}

if [ "$1" = "--if-needed" ] &&
   [ -x "$BIN" ] &&
   [ -f "$STAMP" ] &&
   [ "$(cat "$STAMP")" = "$(current_stamp)" ]; then
  exit 0
fi

if ! [ -x "$(command -v golangci-lint)" ]; then
  echo "golangci-lint is not installed. Please install it from https://golangci-lint.run/welcome/install/"
  exit 1
fi

echo "Building golint (golangci-lint + custom linters)..."
golangci-lint custom
current_stamp > "$STAMP"

echo "Done: $SCRIPT_DIR/$BIN"