feat: try add ffi api for nodejs

cmd/whatchanged-ffi/README.md

@@ -0,0 +1,5 @@
+### macOS
+
+```bash
+go build -buildmode=c-shared -o whatchanged.dylib github.com/release-lab/whatchanged/cmd/whatchanged-ffi
+```

cmd/whatchanged-ffi/main.go

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+// filename: whatchanged.so
+// filename: whatchanged.a
+// filename: whatchanged.dll
+// filename: whatchanged.dylib
+package main
+
+import "C"
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"regexp"
+
+	"github.com/release-lab/whatchanged"
+)
+
+//export Generate
+func Generate(repo *C.char, version *C.char) *C.char {
+	type Result struct {
+		Error  string `json:"error"`
+		Result string `json:"result"`
+	}
+
+	var result Result
+
+	output := bytes.NewBuffer([]byte{})
+
+	err := whatchanged.Generate(context.Background(), C.GoString(repo), output, &whatchanged.Options{
+		Version: regexp.MustCompile(`\s+`).Split(C.GoString(version), -1),
+		Branch:  "master",
+		Preset:  whatchanged.EnumPreset("full"),
+	})
+
+	if err != nil {
+		result.Error = fmt.Sprintf("%+v\n", err)
+	} else {
+		result.Result = output.String()
+	}
+
+	b, _ := json.Marshal(result)
+
+	return C.CString(string(b))
+}
+
+func main() {}

npm/index.js

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+const ffi = require("ffi-napi");
+const path = require("path");
+
+const lib = ffi.Library(path.join(__dirname, "lib", "whatchanged"), {
+  Generate: ["string", ["string", "string"]],
+});
+
+/**
+ * Generate changelog
+ * @param {string} repo
+ * @param {string} version
+ * @returns {Promise<string>}
+ */
+function generate(repo, version) {
+  return new Promise((resolve, reject) => {
+    lib.Generate.async(repo, version, function (err, res) {
+      if (err) {
+        return reject(err);
+      }
+
+      const { result: changelog, error } = JSON.parse(res);
+      if (error) {
+        return reject(new Error(error));
+      }
+
+      resolve(changelog)
+    });
+  });
+}
+
+module.exports.generate = generate;

npm/package.json

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+{
+  "name": "@axetroy/whatchanged",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "ffi-napi": "^4.0.3"
+  }
+}

npm/test.js

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+const { generate } = require("./index");
+
+generate(path.join(__dirname, ".."), "HEAD~")
+  .then((res) => {
+    console.log(res);
+  })
+  .catch((err) => {
+    console.error(err);
+  });