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-rwxr-xr-xTools/scripts/hackage-get-latest-version.sh49
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diff --git a/Tools/scripts/hackage-get-latest-version.sh b/Tools/scripts/hackage-get-latest-version.sh
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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'"