cover.sh

#!/usr/bin/env bash
# shellcheck disable=SC2086

set -e

run(){ echo "$*" 1>&2; "$@"; }

cover() {
    local pkg="$1"
    run go test $GOTEST_ARGS -coverpkg "$pkg" -coverprofile="$prefix.profile" ./...
    prefix="$prefix" "$here/badges.sh"
}

canonicalize() {
    if readlink  -f "$@" 2> /dev/null ||
       greadlink -f "$@" 2> /dev/null
    then true
    else echo "please install coreutils"; exit 1
    fi
}

coverpkg="."  # subpackages to be covered
packages=""   # standalone packages to be covered separately
COVERSH=$(canonicalize "$0")
here="$(dirname "$COVERSH")"
prefix=.cache/cover
mkdir -p .cache

for p in "$@"; do
    if test -e "$p/go.mod" && test "$p" != .
    then packages="$packages $p"
    else coverpkg="$coverpkg,./$p/..."
    fi
done

for p in $packages; do
    echo "covering standalone package $p"
    if test -e Makefile && grep -q "^cover:" Makefile
    then make -C "$p" cover COVERSH="$COVERSH"
    else cd "$p" && cover ./...
    fi
done

if test -n "$coverpkg"; then
    echo "covering packages $coverpkg"
    test -z "$GOTEST_ARGS" || echo "using GOTEST_ARGS=$GOTEST_ARGS as additional cover arguments"
    cover $coverpkg
fi