Add deploy utility

tools/deploy.js

@@ -0,0 +1,51 @@
+
+const fs = require('fs');
+const pathlib = require('path');
+
+const srcDir = process.argv[2];
+const dstDir = process.argv[3];
+if (srcDir === undefined || dstDir === undefined) {
+    throw new Error("Pass in directory to search for deploy scripts & directory to deploy to.");
+}
+
+process.chdir(srcDir);
+
+const stack = ["."];
+const deployMap = new Map;
+let dir;
+while (dir = stack.pop()) {
+    for (const name of fs.readdirSync(dir)) {
+        const path = pathlib.join(dir, name);
+        if (fs.statSync(path).isDirectory()) {
+            stack.push(path);
+        } else if (name === 'deploy.json' || name.endsWith('.deploy.json')) {
+            console.log(`Found ${path}`);
+            const pairs = JSON.parse(fs.readFileSync(path, 'utf8'));
+            for (let [src, dst] of pairs) {
+                src = pathlib.normalize(src);
+                dst = pathlib.normalize(dst);
+
+                if (pathlib.isAbsolute(src)) {
+                    throw new Error('Deploy files are always relative to deploy json');
+                }
+                src = pathlib.join(dir, src);
+
+                if (pathlib.isAbsolute(dst)) {
+                    throw new Error('Deploy files are always relative to destination directory');
+                }
+                dst = pathlib.join(dstDir, dst);
+
+                if (deployMap.has(dst)) {
+                    throw new Error(`Duplicate deploy for ${dst}`);
+                }
+
+                deployMap.set(dst, src);
+            }
+        }
+    }
+}
+
+for (const [dst, src] of deployMap) {
+    fs.mkdirSync(pathlib.dirname(dst), {recursive: true});
+    fs.linkSync(src, dst);
+}