Squashed 'backend/goldmark/' content from commit 379bf24

git-subtree-dir: backend/goldmark
git-subtree-split: 379bf24a47e6ef07f34d7536aead86d8792ac300

_tools/main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+
+	var args []string
+	cmd := "-h"
+	if len(os.Args) > 1 {
+		cmd = os.Args[1]
+	}
+	if len(os.Args) > 2 {
+		args = os.Args[2:]
+	}
+
+	switch cmd {
+	case "oss-fuzz-corpus":
+		ossFuzzCorpusSubCommand(args)
+	case "unicode-case-folding-map":
+		unicodeCaseFoldingMapSubCommand(args)
+	case "emb-structs":
+		embStructsSubCommand(args)
+	case "-h":
+		fallthrough
+	default:
+		fmt.Fprintf(os.Stderr, `Usage: _tools <subcommand> [options]
+subcommands:
+  oss-fuzz-corpus
+  unicode-case-folding-map
+  emb-structs
+`)
+		os.Exit(1)
+	}
+}
+
+func usage(u func(), err error) {
+	u()
+	if err != nil {
+		fmt.Fprint(os.Stderr, err)
+	}
+	os.Exit(1)
+}