refactor(installer): split install scripts into build sources

build.js

@@ -0,0 +1,104 @@
+#!/usr/bin/env node
+/**
+ * ClawGod build script.
+ *
+ * Reads src/ files and install script templates, then produces final
+ * install.sh and install.ps1 with heredoc content embedded.
+ *
+ * src/ layout:
+ *   generic/  - shared by both platforms
+ *   unix/     - install.sh only
+ *   windows/  - install.ps1 only
+ *   template/ - install.sh and install.ps1 templates
+ *
+ * Platform dirs override generic/ for same-named files.
+ */
+
+const { readFileSync, writeFileSync, existsSync } = require('fs');
+const { join } = require('path');
+
+const root = __dirname;
+const src = join(root, 'src');
+
+// ─── Placeholder → source file mapping ───────────────────────────────
+
+const PLACEHOLDER_MAP = {
+  'extract-natives.mjs': 'extractor.js',
+  'post-process.mjs': 'post-processor.js',
+  'repatch.mjs': 'repatcher.js',
+  'cli.cjs': 'wrapper.js',
+  'patch.mjs': 'patcher.js',
+  'features.json': 'features.json',
+  'npm-fetch.mjs': 'npm-fetch.js',
+};
+
+// Build a content map for a specific platform.
+// Lookup order: {platform}/ → generic/
+function buildContentMap(platform) {
+  const map = {};
+  for (const [placeholder, filename] of Object.entries(PLACEHOLDER_MAP)) {
+    let found = null;
+    for (const dir of [platform, 'generic']) {
+      const p = join(src, dir, filename);
+      if (existsSync(p)) { found = p; break; }
+    }
+    if (!found) {
+      // Some files only exist in one platform's template (e.g. npm-fetch.mjs
+      // is PS1-only). Skip silently — if the template doesn't use the
+      // placeholder, no harm done.
+      continue;
+    }
+    map[placeholder] = readFileSync(found, 'utf8');
+  }
+  return map;
+}
+
+// ─── Template rendering ──────────────────────────────────────────────
+
+function renderTemplate(templatePath, contentMap) {
+  let template = readFileSync(templatePath, 'utf8');
+
+  for (const [name, content] of Object.entries(contentMap)) {
+    const placeholder = `{{CONTENT:${name}}}`;
+    const replacement = content.endsWith('\n') ? content.slice(0, -1) : content;
+    // Function-form replace: avoids $$/$&/$1 special pattern interpretation.
+    template = template.replaceAll(placeholder, () => replacement);
+  }
+
+  const unresolved = template.match(/{{CONTENT:[^}]+}}/g);
+  if (unresolved) {
+    throw new Error(`Unresolved placeholders in ${templatePath}: ${[...new Set(unresolved)].join(', ')}`);
+  }
+
+  return template;
+}
+
+// ─── Build ───────────────────────────────────────────────────────────
+
+function build() {
+  const shTemplate = join(src, 'template', 'install.sh');
+  const ps1Template = join(src, 'template', 'install.ps1');
+
+  if (!existsSync(shTemplate)) {
+    console.error('Template not found:', shTemplate);
+    process.exit(1);
+  }
+  if (!existsSync(ps1Template)) {
+    console.error('Template not found:', ps1Template);
+    process.exit(1);
+  }
+
+  const shMap = buildContentMap('unix');
+  const ps1Map = buildContentMap('windows');
+
+  const shContent = renderTemplate(shTemplate, shMap);
+  const ps1Content = renderTemplate(ps1Template, ps1Map);
+
+  writeFileSync(join(root, 'install.sh'), shContent, 'utf8');
+  writeFileSync(join(root, 'install.ps1'), ps1Content, 'utf8');
+
+  console.log(`Built: install.sh (${(shContent.length / 1024).toFixed(0)} KB)`);
+  console.log(`Built: install.ps1 (${(ps1Content.length / 1024).toFixed(0)} KB)`);
+}
+
+build();