add bench target and scripts to run simple benchmark

Cargo.toml

@@ -13,6 +13,7 @@ documentation = "https://docs.rs/jotdown"
 exclude = [
     ".gitmodules",
     "Makefile",
+    "benches",
     "modules",
     "tests",
 ]

Makefile

@@ -18,6 +18,13 @@ suite_bench:
 	(cd tests/bench && make)
 	cargo test --features suite_bench
 
+.PHONY: bench
+bench:
+	git submodule update --init modules/djot.js
+	for f in $$(find modules/djot.js/bench -name '*.dj' | xargs basename -a); do \
+		ln -fs ../modules/djot.js/bench/$$f benches/$$f; \
+	done
+
 clean:
 	cargo clean
 	git submodule deinit -f --all
@@ -25,3 +32,4 @@ clean:
 	(cd tests/suite && make clean)
 	rm -f tests/bench/*.dj
 	(cd tests/bench && make clean)
+	rm -f benches/*.dj

benches/bench.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+cmd=$*
+
+test_html=$(echo "abc" | $cmd | tr -d ' \n')
+[ "$test_html" != "<p>abc</p>" ] && echo "failed simple gen: '$test_html'" && exit 1
+
+for f in *.dj; do
+    tmp=$(mktemp)
+    for i in $(seq 500); do
+        cat "$f" >> $tmp
+    done
+    t=$(cat "$tmp" \
+        | (LANG=C time -p $cmd > /dev/null) 2>&1 \
+        | grep real \
+        | awk '{print $2}')
+    printf "$t\t$f\n"
+    rm -f "$tmp"
+done | sort -rn