util: tune args parser to support input/output.

src/util/args.ts

@@ -1,19 +1,45 @@
+import path from 'path';
+import {parse} from 'ts-command-line-args';
+
 import {checkIfFileIsYaml} from './yaml';
 
-import {STRINGS} from '../config';
+import {CONFIG, STRINGS} from '../config';
+
+import {ImplProcessArgs} from '../types/process-args';
+
+const {VALIDATION} = CONFIG;
+const {IMPL_CLI} = VALIDATION;
 
 const {WRONG_CLI_ARGUMENT} = STRINGS;
 
+/**
+ * Validates process arguments
+ * @private
+ */
+const validateAndParseProcessArgs = () => parse<ImplProcessArgs>(IMPL_CLI);
+
+/**
+ * Prepends process path to fiven `filePath`.
+ * @private
+ */
+const prependFullFilePath = (filePath: string) => {
+  const processRunningPath = process.cwd();
+
+  return path.normalize(`${processRunningPath}/${filePath}`);
+};
+
 /**
  * Parses process argument, if it's `yaml` file, then returns it.
  * Otherwise throws error.
  */
 export const parseProcessArgument = () => {
-  const lastArgIndex = process.argv.length - 1;
-  const path = process.argv[lastArgIndex];
+  const {impl, ompl} = validateAndParseProcessArgs();
 
-  if (checkIfFileIsYaml(path)) {
-    return path;
+  if (checkIfFileIsYaml(impl)) {
+    return {
+      inputPath: prependFullFilePath(impl),
+      ...(ompl && {outputPath: prependFullFilePath(ompl)}),
+    };
   }
 
   throw Error(WRONG_CLI_ARGUMENT);