Add benchmark script

* Structure `cli` crate as both a library and an executable, so that
benchmarks can import code from the crate.
* Import macros in the Rust 2018 style.

script/benchmark

@@ -6,7 +6,7 @@ function usage {
   cat <<-EOF
 USAGE
 
-  $0  [-Ld] [-l language-name] [-f example-file-name]
+  $0  [-h] [-l language-name] [-e example-file-name]
 
 OPTIONS
 
@@ -14,63 +14,24 @@ OPTIONS
 
   -l  run only the benchmarks for the given language
 
-  -f  run only the benchmarks that parse the file with the given name
-
-  -d  run tests in a debugger (either lldb or gdb)
-
-  -L  run benchmarks with parse logging turned on
-
-  -b  run make under the scan-build static analyzer
+  -e  run only the benchmarks that parse the example file with the given name
 
 EOF
 }
 
-if [ "$(uname -s)" == "Darwin" ]; then
-  export LINK="clang++ -fsanitize=address"
-fi
-
-mode=normal
-export BUILDTYPE=Release
-cmd=out/$BUILDTYPE/benchmarks
-run_scan_build=
-
-while getopts "bdhf:l:SL" option; do
+while getopts "hl:e:" option; do
   case ${option} in
     h)
       usage
       exit
       ;;
-    d)
-      mode=debug
-      ;;
-    f)
-      export TREE_SITTER_BENCHMARK_FILE_NAME=${OPTARG}
+    e)
+      export TREE_SITTER_BENCHMARK_EXAMPLE_FILTER=${OPTARG}
       ;;
     l)
-      export TREE_SITTER_BENCHMARK_LANGUAGE=${OPTARG}
-      ;;
-    L)
-      export TREE_SITTER_BENCHMARK_LOG=1
-      ;;
-    b)
-      run_scan_build=true
+      export TREE_SITTER_BENCHMARK_LANGUAGE_FILTER=${OPTARG}
       ;;
   esac
 done
 
-if [[ -n "$run_scan_build" ]]; then
-  . script/util/scan-build.sh
-  scan_build make -j2 benchmarks
-else
-  make -j2 benchmarks
-fi
-
-case $mode in
-  debug)
-    lldb $cmd
-    ;;
-
-  normal)
-    exec $cmd
-    ;;
-esac
+cargo bench

script/benchmark.cmd

@@ -0,0 +1,3 @@
+@echo off
+
+cargo bench