Use perevir for testing

Makefile

@@ -1,27 +1,6 @@
-# Name of the filter file, *with* `.lua` file extension.
-FILTER_FILE := $(wildcard *.lua)
-# Name of the filter, *without* `.lua` file extension
-FILTER_NAME = $(patsubst %.lua,%,$(FILTER_FILE))
-
-# Allow to use a different pandoc binary, e.g. when testing.
-PANDOC ?= pandoc
-# Allow to adjust the diff command if necessary
-DIFF = diff
-
-# Test that running the filter on the sample input document yields
-# the expected output.
-#
-# The automatic variable `$<` refers to the first dependency
-# (i.e., the filter file).
-test: $(FILTER_FILE) test/input.md test/test.yaml
-	$(PANDOC) --defaults test/test.yaml | \
-		$(DIFF) test/expected.native -
+# Use perevir to run the test
+test: test/perevirka.md
+	perevir $<
 
 # Ensure that the `test` target is run each time it's called.
 .PHONY: test
-
-# Re-generate the expected output. This file **must not** be a
-# dependency of the `test` target, as that would cause it to be
-# regenerated on each run, making the test pointless.
-test/expected.native: $(FILTER_FILE) test/input.md test/test.yaml
-	$(PANDOC) --defaults test/test.yaml --output=$@

test/perevirka.md

@@ -0,0 +1,36 @@
+---
+perevir:
+  filters:
+  - parse-latex.lua
+---
+
+The below Markdown contains LaTeX snippets to set the color of
+some words, and to define a table.
+
+``` markdown {#input}
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec
+hendrerit \textcolor{red}{tempor tellus}. Donec pretium posuere
+tellus. Proin quam nisl, tincidunt et, mattis eget, convallis nec,
+purus.
+
+\begin{tabularx}{0.8\textwidth} { l | c | r }
+ lorem 1 & ipsum 1 & nullus \\
+ \hline
+ lorem 2 & ipsum 2 & nullus \\
+\end{tabularx}
+```
+
+Both uses of LaTeX are picked up and translated to Markdown.
+
+> <div id="output">
+>
+> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec
+> hendrerit [tempor tellus]{style="color: red"}. Donec pretium posuere
+> tellus. Proin quam nisl, tincidunt et, mattis eget, convallis nec,
+> purus.
+>
+> | lorem 1 | ipsum 1 | nullus |
+> |:--------|:-------:|-------:|
+> | lorem 2 | ipsum 2 | nullus |
+>
+> </div>