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#!/bin/sh
#
# MAINTAINER: yuri@FreeBSD.org
set -e
set -o pipefail
export LC_ALL=C
##
## hackage-get-latest-version.sh: retrieves the latest version of a given Haskell package as registered on https://hackage.haskell.org
##
# args
PACKAGE_NAME="$1"
if [ -z "$PACKAGE_NAME" ]; then
echo "Usage: $0 <package-name>"
echo "Example: $0 cryptol"
echo "Example: $0 ShellCheck"
exit 1
fi
# check that packaged dependencies are installed
for dep in curl jq version_sort; do
if ! which -s $dep; then
echo "error: the '$dep' dependency is missing"
if [ $dep = "curl" ]; then
echo "... please install the 'curl' package"
elif [ $dep = "jq" ]; then
echo "... please install the 'jq' package"
elif [ $dep = "version_sort" ]; then
echo "... please install the 'libversion' package"
fi
exit 1
fi
done
# MAIN
curl -H "Accept: application/json" https://hackage.haskell.org/package/$PACKAGE_NAME 2>/dev/null |
grep -v "Package not found: No such package in package index" |
jq -r 'keys[]' |
version_sort |
tail -1 ||
! echo "failed to find the Haskell package '$PACKAGE_NAME'"
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