generate shell script

packages/web/src/impexp/ScriptWriter.js

@@ -0,0 +1,26 @@
+export default class ScriptWriter {
+  constructor() {
+    this.s = '';
+    this.put('const dbgateApi = require("@dbgate/api");');
+    this.put('async function run() {');
+  }
+
+  put(s) {
+    this.s += s;
+    this.s += '\n';
+  }
+
+  finish() {
+    this.put('await dbgateApi.copyStream(queryReader, csvWriter);');
+    this.put('dbgateApi.runScript(run);');
+    this.put('}');
+  }
+
+  assign(variableName, functionName, props) {
+    this.put(`const ${variableName} = await dbgateApi.${functionName}(${JSON.stringify(props)});`);
+  }
+
+  copyStream(sourceVar, targetVar) {
+    this.put(`await dbgateApi.copyStream(${sourceVar}, ${targetVar});`);
+  }
+}