Add missing maven download make fragment.

diff --git a/maven.make b/maven.make
new file mode 100644 (file)
index 0000000..c9e82e2
--- /dev/null
+++ b/maven.make
@@ -0,0 +1,74 @@
+#
+# Copyright (C) 2021 Michael Zucchi
+#
+# This is the copyright for maven.make
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# This lets one download maven packages using simple automake syntax.
+
+# maven_<name>_URL = baseurl
+
+# Define the base url.  maven_central_URL is already defined as
+# maven_central_URL:=https://repo1.maven.org/maven2
+
+# maven_<name>_JARS = group:artifact:version group:artifact:version ...
+
+# Define the artifacts required from the given maven repository.
+
+# That's it!
+
+# It defines several make targets.
+
+# make maven-init
+#  Will download the jar files.
+
+# make maven-verify
+#  Will download and check the signatures using gpg.  The public key
+#  required for verification must be imported to gpg separately.
+
+# make distclean
+#  Will delete .lib
+
+# define maven central
+maven_central_URL:=https://repo1.maven.org/maven2
+maven_repository_URL:=https://mvnrepository.com/artifact
+
+# find out what repositories the makefile defined
+maven_REPOS=$(patsubst maven_%_URL,%,$(filter maven_%_URL,$(.VARIABLES)))
+
+# (group artifact version baseurl)
+define maven_func=
+.lib/$2-$3.jar:
+       mkdir -p .lib
+       wget -O $$@ $(4)/$(subst .,/,$1)/$2/$3/$2-$3.jar || ( rm $$@ ; exit 1 )
+.lib/$2-$3.jar.asc: .lib/$2-$3.jar
+       wget -O $$@ $(4)/$(subst .,/,$1)/$2/$3/$2-$3.jar.asc
+       gpg --batch --verify $$@ $$< || ( rm $$@ ; echo "GPG verification failed, you may need to import the public key." ; exit 1 )
+maven-init: .lib/$2-$3.jar
+maven-verify: .lib/$2-$3.jar.asc
+endef
+
+maven-init:
+maven-verify:
+
+.PHONY: maven-init maven-verify
+
+$(foreach repo,$(maven_REPOS),\
+       $(foreach jar,$(maven_$(repo)_JARS), \
+               $(eval $(call maven_func,$(word 1,$(subst :, ,$(jar))),$(word 2,$(subst :, ,$(jar))),$(word 3,$(subst :, ,$(jar))),$(maven_$(repo)_URL)))))
+
+distclean:
+       rm -rf .lib