feat: add throw errors

dzx.ts

@@ -1,8 +1,8 @@
 /// <reference path="./types.d.ts" />
 
 import { join, readAll } from "./deps.ts";
-import { ProcessError } from "./src/process_error.ts";
 import { $, cd, quote } from "./mod.ts";
+import { error } from "./src/_utils.ts";
 
 window.$ = $;
 window.cd = cd;
@@ -19,9 +19,10 @@ try {
           `data:application/typescript,${encodeURIComponent(data)}`
         );
       } else {
-        console.error(`usage: dzx <script>`);
-        Deno.exit(2);
+        error(`usage: dzx <script>`, 2);
       }
+    } else {
+      error(`usage: dzx <script>`);
     }
   } else if (
     script.startsWith("http://") || script.startsWith("https://") ||
@@ -31,12 +32,8 @@ try {
   } else if (script) {
     await import("file://" + join($.cwd, script));
   } else {
-    console.error(`usage: dzx <script>`);
-    Deno.exit(1);
+    error(`usage: dzx <script>`);
   }
-} catch (error) {
-  if (error instanceof ProcessError) {
-    console.error(error);
-  }
-  throw error;
+} catch (err) {
+  error(err);
 }

mod.ts

@@ -8,18 +8,18 @@ export type $ = typeof exec & typeof colors & {
   cwd: string;
   shell: string;
   quote: typeof escapeStr;
+  throwErors: boolean;
 };
 
 export const $: $ = exec as $;
 
-export { quote };
-
 Object.setPrototypeOf($, Object.getPrototypeOf(colors));
 
 $._stack = [];
 $.shell = "/bin/sh";
 $.verbose = false;
 $.cwd = Deno.cwd();
 $.quote = escapeStr;
+$.throwErors = false;
 
-export { cd };
+export { cd, quote };

src/_utils.ts

@@ -0,0 +1,13 @@
+export function error(message: string | Error, exitCode = 1) {
+  if ($.throwErors) {
+    throw (message instanceof Error
+      ? message
+      : new Error(getErrorMessage(message)));
+  }
+  console.error(message instanceof Error ? message : getErrorMessage(message));
+  Deno.exit(exitCode);
+}
+
+function getErrorMessage(message: string) {
+  return $.red(`${$.bold("error:")} ${message}`);
+}

src/cd.ts

@@ -1,23 +1,21 @@
+import { error } from "./_utils.ts";
+
 export function cd(path: string) {
   if ($.verbose) {
     console.log($.brightBlue("$ %s"), `cd ${path}`);
   }
 
   try {
     Deno.lstatSync(path);
-  } catch (error) {
-    if (error instanceof Deno.errors.NotFound) {
+  } catch (err) {
+    if (err instanceof Deno.errors.NotFound) {
       const stack: string = (new Error().stack!.split("at ")[2]).trim();
-      console.error(`cd: ${path}: No such directory`);
-      console.error(`  at ${stack}`);
-      Deno.exit(1);
-    } else if (error instanceof Deno.errors.PermissionDenied) {
+      error(`cd: ${path}: No such directory\n  at ${stack}`);
+    } else if (err instanceof Deno.errors.PermissionDenied) {
       const stack: string = (new Error().stack!.split("at ")[2]).trim();
-      console.error(`cd: ${path}: Permission denied`);
-      console.error(`  at ${stack}`);
-      Deno.exit(1);
+      error(`cd: ${path}: Permission denied\n  at ${stack}`);
     }
-    throw error;
+    error(err);
   }
 
   $.cwd = path;