pip-ls-deps
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pip-ls-deps
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	#!/bin/bash

	LS_MODS="bin/ls-py-modules"
	if ! [ -x "$LS_MODS" ] ; then
	echo "pip-ls-deps should be run from the root of swh-environment. Bye."
	exit 2
	fi

	for pymod in $(${LS_MODS}) ; do
	reqs="${pymod}/requirements.txt"
	if [ -f "$reqs" ] ; then
	cat "$reqs"
	fi
	done \
	\| egrep -v '^#\|^[[:blank:]]*$' \
	\| tr '[:upper:]_' '[:lower:]-' \
	\| sort -ru \
	\| awk '!seen[$1]++' \
	\| tac

	# WARNING: CRUDE HACK in the pipeline above. 'pip3 install' will fail if the
	# same package name appears multiple times, e.g., as both "django" and "django
	# >= 1.10.7" rather than trying to determine (when possible) a comprehensive
	# constraint. So we deduplicate here, by first sorting alphabetically which
	# will (generally...) put higher dependency constraints last and then
	# deduplicate using the sole package name as key. In the example above this
	# should only keep "django >= 1.10.7" and get rid of "django".