#!/usr/bin/env sh

set -e

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

# go-lint is public, but the public checksum database has not indexed it yet.
# Preserve existing exclusions while fetching the module through the normal
# proxy-then-direct resolution path.
export GONOSUMDB="${GONOSUMDB:+$GONOSUMDB,}git.offline-twitter.com"

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

# The pinned plugin version is recorded in .custom-gcl.yaml.
current_stamp() {
    sha256sum .custom-gcl.yaml | 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

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

echo "Done: $PROJECT_ROOT/$BIN"