Use separate expected output for old pandoc versions

Author: tarleb

.github/workflows/ci.yaml

@@ -42,4 +42,4 @@ jobs:
         run: apk add make
 
       - name: Test
-        run: make test
+        run: make test PANDOC_VERSION=${{ matrix.pandoc }}

Makefile

@@ -1,8 +1,14 @@
 DIFF ?= diff
 PANDOC ?= pandoc
 
+# Use special expected output file if it exists.
+expected_output = test/expected.$(PANDOC_VERSION).txt
+ifeq ($(wildcard $(expected_output)),)
+expected_output = test/expected.txt
+endif
+
 test: test/input.md multiple-bibliographies.lua
 	@$(PANDOC) -d test/test.yaml \
-	    | $(DIFF) - test/expected.txt
+	    | $(DIFF) $(expected_output) -
 
 .PHONY: test

test/expected.2.17.txt

@@ -0,0 +1,16 @@
+Multiple Bibliographies Demo
+
+Nietzsche (1872), Bellori (1672)
+
+References
+
+Bellori. 1672. Le Vite de’ Pittori, Scultori e Architetti Moderni.
+
+Nietzsche, Friedrich. 1872. Die Geburt Der Tragödie Aus Dem Geiste Der
+Musik.
+
+Recommended Reading
+
+Bätschmann, Oskar. 1985. Pygmalion Als Betrachter.
+
+Knuth, Donald E. 1986. The TeXbook.