From d6466555df792cda43c4db55698cc201cafe211f Mon Sep 17 00:00:00 2001
From: Dustin Swan <dustin@dustinswan.com>
Date: Wed, 1 Apr 2026 21:55:30 -0600
Subject: [PATCH] Saving modules to files

---
 src/cg/06-textEditor.cg | 10 +++++++---
 src/runtime-js.ts       | 22 ++++++++++++++++++++++
 vite.config.ts          | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+), 3 deletions(-)
 create mode 100644 vite.config.ts

diff --git a/src/cg/06-textEditor.cg b/src/cg/06-textEditor.cg
index abcb686..554d72c 100644
--- a/src/cg/06-textEditor.cg
+++ b/src/cg/06-textEditor.cg
@@ -12,9 +12,13 @@ textEditor = name \
   buffersKey = "textEditorBuffers";
 
   # load from staging buffers if it exists there. if not, load from source
-  source = getAt [buffersKey, name]
-    | None \ getSource name
-    | Some v \ v;
+  # source = getAt [buffersKey, name]
+  #   | None \ getSource name
+  #   | Some v \ v;
+
+  source = getModuleSource name
+    | Some s \ s
+    | None \ getSource name;
 
   lines = split "\n" source;
 
diff --git a/src/runtime-js.ts b/src/runtime-js.ts
index bc4358d..c840bb3 100644
--- a/src/runtime-js.ts
+++ b/src/runtime-js.ts
@@ -122,6 +122,12 @@ export const _rt = {
         if (!def) return "";
         return prettyPrint(def);
     },
+    getModuleSource: (moduleName: string) => {
+        const moduleDefs = [...definitions.values()]
+            .filter(d => d.module === moduleName);
+        if (moduleDefs.length === 0) return { _tag: 'None' };
+        return { _tag: 'Some', _0: moduleDefs.map(d => prettyPrint(d)).join('\n\n') };
+    },
     "saveImage!": () => {
         const saved: Record<string, string> = {};
         for (const [name, ast] of definitions) {
@@ -138,6 +144,22 @@ export const _rt = {
        URL.revokeObjectURL(url);
        return { _tag: 'Ok' };
     },
+    "saveModule!": (moduleName: string) => {
+        const moduleDefs = [...definitions.values()]
+            .filter(d => d.module === moduleName);
+        if (moduleDefs.length === 0) return { _tag: 'Err', _0: 'No module: ' + moduleName };
+
+        const content = '@' + moduleName + '\n\n' +
+            moduleDefs.map(d => prettyPrint(d)).join('\n\n') + '\n\n@\n';
+
+        fetch('/api/save', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ filename: moduleName, content })
+        });
+
+       return { _tag: 'Defined', _0: moduleName };
+    },
     rebind: (name: string, pathOrValue: any, maybeValue?: any) => {
         if (maybeValue === undefined) {
             store[name] = pathOrValue;
diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..023e558
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,33 @@
+import { defineConfig } from 'vite'
+import fs from 'fs'
+import path from 'path'
+
+export default defineConfig({
+    plugins: [{
+        name: 'cg-save',
+        configureServer(server) {
+            server.middlewares.use('/api/save', (req, res) => {
+                if (req.method !== 'POST') {
+                    res.statusCode = 405;
+                    res.end();
+                    return;
+                }
+
+                let body = '';
+                req.on('data', chunk => body += chunk);
+                req.on('end', () => {
+                    try {
+                        const { filename, content } = JSON.parse(body);
+                        const filePath = path.join(__dirname, 'src/cg2', filename + '.cg');
+                        fs.writeFileSync(filePath, content);
+                        res.statusCode = 200;
+                        res.end(JSON.stringify({ ok: true }));
+                    } catch (e: any) {
+                        res.statusCode = 500;
+                        res.end(JSON.stringify({ error: e.message }));
+                    }
+                });
+            });
+        }
+    }]
+})