#!/usr/bin/env bash

set -x
set -e

PROFRAW_DIR=$1
OUTPUT_FILENAME=$2

# Reads the paths to prof data files from INPUT_FILENAME and then merges them
# into OUTPUT_FILENAME.
TARGETS=($(find ${PROFRAW_DIR} -name '*.profraw'))

if [[ ${#TARGETS[@]} -eq 0 ]]; then
    echo "Error! No *.profraw targets to merge!"
    exit 1
fi

FIRST_TARGET=${TARGETS[0]}
xcrun -sdk macosx llvm-profdata merge -output-file=${OUTPUT_FILENAME} ${FIRST_TARGET}

if [[ ${#TARGETS[@]} -eq 1 ]]; then
    exit 0
fi

# Reduce over the rest of the targets
for t in "${TARGETS[@]:1}"; do
    xcrun -sdk macosx llvm-profdata merge -o=${OUTPUT_FILENAME}.tmp ${t} ${OUTPUT_FILENAME}
    mv ${OUTPUT_FILENAME}.tmp ${OUTPUT_FILENAME}
done

set +e
set +x