Filter coverage results from xcodebuild

coverage_reporter.sh

#!/bin/bash

# set -x

# The default code coverage output from `xcodebuild test -enableCodeCoverage YES` is misleading since it contains stats
# for the test files themselves. This script goes through the xcov archive and extracts those paths that have
# '/Features/Sources/' in them. It then generates a new report using just those files. Major PITA.

# There must be an an archive file to use
# shellcheck disable=SC2086
set -- ${PWD}/coverage_iOS/Test-SoundFontsPlus-*.xcresult
archive="${1}"
[[ -d "${archive}" ]] || exit 1

# Generate the list of source files to process. We only want non-test files.
files="${PWD}/coverage_iOS/files.txt"
if [[ ! -f "${files}" ]]; then
  xcrun xccov view --archive --file-list "${archive}" | grep '/Features/Sources/' > "${files}"
fi

# For each source file, get its coverage stats as a JSON object
stats="${PWD}/coverage_iOS/stats.txt"
if [[ ! -f "${stats}" ]]; then
  while read -r line; do
    xcrun xccov view --report --functions-for-file "${line}" --json "${archive}" >> "${stats}"
  done < "${files}"
fi

# The `$stats` file now has an entry for each file. Use `-s` to treat as one array instead of N arrays, then:
# - take first (only) element and get its `functions` attribute
# - for each function object, get the sum of the `coveredLines` and `executableLines` attributes as an array of two values
# - get sums of all of the file coverage sums as an array of two values
# - calculate the coverage percentage by operating on the two values
#
pct=$(jq -s 'map(first|.functions|[map(.coveredLines),map(.executableLines)|add])|[map(.[0]),map(.[1])|add]|.[0]/.[1]*100.0' < "${stats}")
printf "%.1f%%\n" "${pct}"