build(Makefile): warn user about Org version if ORG_PATH is unset

I've named it contrapunctus.mk to avoid getting clobbered by the
autogenerated Makefile. If we do away with the autotools stuff, we
could rename it Makefile.

contrapunctus.mk

@@ -0,0 +1,56 @@
+.phony: all setup tangle compile lint clean
+
+all: setup tangle compile lint
+
+setup:
+	emacs --batch --eval="(package-initialize)" \
+	--eval="(mapcar #'package-install '(indent-lint package-lint relint))"
+
+# No -q or -Q without ORG_PATH - if the user has a newer version of
+# Org, we want to use it.
+jabber.el:
+	if [ -z "${ORG_PATH}" ]; then \
+          echo ; \
+	  echo "[WARNING] ORG_PATH is unset. Org versions older than 9.3.8 have a bug" ; \
+	  echo "which result in them always using absolute paths in comment links in" ; \
+	  echo "tangled source files. If your Org version is older than 9.3.8, please" ; \
+	  echo "upgrade it before tangling." ; \
+          echo ; \
+          emacs --batch \
+          --eval="(require 'ob-tangle)" \
+          --eval='(org-babel-tangle-file "jabber.org")' ; \
+        else \
+          emacs -q -Q --batch \
+          --eval="(add-to-list 'load-path \"${ORG_PATH}\")" \
+          --eval="(require 'ob-tangle)" \
+          --eval='(org-babel-tangle-file "jabber.org")' ; \
+        fi
+
+tangle: jabber.el
+
+compile: tangle
+	emacs -q -Q --batch --eval='(byte-compile-file "jabber.el")' ; \
+
+lint-check-declare: tangle
+	emacs -q -Q --batch --eval='(check-declare-file "jabber.el")'
+
+lint-checkdoc: tangle
+	emacs -q -Q --batch --eval='(checkdoc-file "jabber.el")'
+
+lint-package-lint: setup tangle
+	emacs -Q --batch --eval='(package-initialize)' \
+        --eval="(require 'package-lint)" \
+        -f 'package-lint-batch-and-exit' jabber.el
+
+lint-relint: setup tangle
+	emacs -q -Q --batch --eval='(relint-file "jabber.el")'
+
+lint: lint-check-declare lint-checkdoc lint-package-lint lint-relint
+
+clean-tangle:
+	-rm jabber.el
+
+clean-elc:
+	-rm *.elc
+
+clean: clean-elc

jabber.org

@@ -1,6 +1,6 @@
 #+TITLE: jabber.el
 #+SUBTITLE: XMPP client for Emacs
-#+PROPERTY: header-args :tangle yes :load yes
+#+PROPERTY: header-args :tangle yes :load yes :comments link
 #+TODO: TODO WIP EXTEND CLEANUP FIXME REVIEW |
 
 * README
@@ -144,11 +144,15 @@ It is possible to make various web browsers pass links starting with "xmpp:" to
   - 2021 resurrection
 + contrapunctus
   - literate Org migration
+  - Makefile
++ tomasino on #team@irc.tilde.chat
+  - helping contrapunctus debug the Makefile
 
 * TODO maintenance [0%]
 1. [ ] Satisfy =M-x checkdoc=
 2. [ ] Use =rx= where regular expressions get hairy
 3. [ ] hexrgb.el is not available on MELPA
+4. [ ] Migrate tests to ERT/Buttercup/etc
 
 * About this file
 jabber.el is an Org literate program. Tangling is done automatically after each save.