From 306c7c2cae3c9855aa68347bb3ae01e7eb535c25 Mon Sep 17 00:00:00 2001
From: Tony Garnock-Jones <tonyg@leastfixedpoint.com>
Date: Wed, 17 Mar 2021 16:14:45 +0100
Subject: [PATCH] Support writing to stdout

---
 .../schema/src/bin/preserves-schema-ts.ts     | 24 ++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/implementations/javascript/packages/schema/src/bin/preserves-schema-ts.ts b/implementations/javascript/packages/schema/src/bin/preserves-schema-ts.ts
index 88bf4ba..53b4c03 100644
--- a/implementations/javascript/packages/schema/src/bin/preserves-schema-ts.ts
+++ b/implementations/javascript/packages/schema/src/bin/preserves-schema-ts.ts
@@ -13,6 +13,7 @@ export type CommandLineArguments = {
     input: string;
     base: string | undefined;
     output: string | undefined;
+    stdout: boolean;
     core: string;
     watch: boolean;
     traceback: boolean;
@@ -167,15 +168,26 @@ export function runOnce(options: CommandLineArguments): CompilationResult {
             })),
         ];
         fs.mkdirSync(path.dirname(c.outputFilePath), { recursive: true });
+        let compiledModule;
         try {
-            fs.writeFileSync(c.outputFilePath, compile(env, c.schema, {
+            compiledModule = compile(env, c.schema, {
                 preservesModule: options.core,
                 warn: (message: string, pos: Position | null) =>
                     failures.push({ type: 'warn', file: c.inputFilePath, detail: { message, pos } }),
-            }), 'utf-8');
+            });
         } catch (e) {
             failures.push({ type: 'error', file: c.inputFilePath, detail: e });
         }
+        if (compiledModule !== void 0) {
+            if (options.stdout) {
+                console.log('////------------------------------------------------------------');
+                console.log('//// ' + c.outputFilePath);
+                console.log();
+                console.log(compiledModule);
+            } else {
+                fs.writeFileSync(c.outputFilePath, compiledModule, 'utf-8');
+            }
+        }
     });
 
     for (const d of failures) {
@@ -208,7 +220,13 @@ export function main(argv: Array<string>) {
                      })
                      .option('output', {
                          type: 'string',
-                         description: 'Output directory for sources (default: next to sources)',
+                         description: 'Output directory for modules (default: next to sources)',
+                     })
+                     .option('stdout', {
+                         type: 'boolean',
+                         description: 'Prints each module to stdout one after the other instead ' +
+                             'of writing them to files in the `--output` directory',
+                         default: false,
                      })
                      .option('base', {
                          type: 'string',