diff --git a/packages/core/bin/syndicatec.js b/packages/core/bin/syndicatec.js
index c713452..afd1cb2 100755
--- a/packages/core/bin/syndicatec.js
+++ b/packages/core/bin/syndicatec.js
@@ -1,4 +1,79 @@
 #!/usr/bin/env node
 
-import { main } from '../lib/compiler/main.js';
-main(process.argv);
+const yargs = require('yargs/yargs');
+const { hideBin } = require('yargs/helpers');
+const argv =
+      yargs(hideBin(process.argv))
+      .completion()
+      .command('$0 [input]', 'Compile a single file', (yargs) => {
+        yargs
+          .positional('input', {
+            type: 'string',
+            description: 'Input filename',
+          })
+          .option('output', {
+            alias: 'o',
+            type: 'string',
+            description: 'Output filename (stdout if omitted)',
+            default: null,
+          })
+          .option('map', {
+            type: 'boolean',
+            description: 'Generate source maps',
+            default: true,
+          })
+          .option('map-extension', {
+            type: 'string',
+            description: 'Extension (e.g. ".map") to add to source map files; if omitted, source maps are generated inline',
+            default: null,
+          })
+          .option('runtime', {
+            type: 'string',
+            description: 'Path to require or import to get the Syndicate runtime',
+            default: '@syndicate/core',
+          })
+          .option('module', {
+            type: 'string',
+            description: 'es6 | require | global',
+          })
+      })
+      .argv;
+
+const fs = require('fs');
+const { compile } = require('../dist/syndicate.js').Compiler;
+
+// console.log(argv);
+
+const inputFilename = 'input' in argv ? argv.input : '/dev/stdin';
+const source = fs.readFileSync(inputFilename, 'utf-8');
+
+const { text, map } = compile({
+  source,
+  name: inputFilename,
+  runtime: argv.runtime,
+  module: argv.module,
+});
+map.sourcesContent = [source];
+
+function mapDataURL() {
+  const mapData = Buffer.from(JSON.stringify(map)).toString('base64')
+  return `data:application/json;base64,${mapData}`;
+}
+
+if (argv.output !== null) {
+  if (!argv.map) {
+    fs.writeFileSync(argv.output, text);
+  } else if (argv.mapExtension) {
+    const mapFilename = argv.output + argv.mapExtension;
+    fs.writeFileSync(argv.output, text + `\n//# sourceMappingURL=${mapFilename}`);
+    fs.writeFileSync(mapFilename, JSON.stringify(map));
+  } else {
+    fs.writeFileSync(argv.output, text + `\n//# sourceMappingURL=${mapDataURL()}`);
+  }
+} else {
+  if (!argv.map) {
+    console.log(text);
+  } else {
+    console.log(text + `\n//# sourceMappingURL=${mapDataURL()}`);
+  }
+}
diff --git a/packages/core/package.json b/packages/core/package.json
index 38c566b..ac09c6b 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -20,7 +20,8 @@
   "types": "lib/index.d.ts",
   "author": "Tony Garnock-Jones <tonyg@leastfixedpoint.com>",
   "dependencies": {
-    "preserves": "0.4.0"
+    "preserves": "0.4.0",
+    "yargs": "^16.2.0"
   },
   "bin": {
     "syndicatec": "./bin/syndicatec.js"
diff --git a/packages/core/src/compiler/main.ts b/packages/core/src/compiler/codegen.ts
similarity index 81%
rename from packages/core/src/compiler/main.ts
rename to packages/core/src/compiler/codegen.ts
index 94c9ecd..4586453 100644
--- a/packages/core/src/compiler/main.ts
+++ b/packages/core/src/compiler/codegen.ts
@@ -1,4 +1,3 @@
-import * as fs from 'fs';
 import * as S from '../syntax/index.js';
 import { Substitution } from '../syntax/index.js';
 import * as G from './grammar.js';
@@ -13,17 +12,41 @@ export function stripShebang(items: S.Items): S.Items {
     return items;
 }
 
-export function main(argv: string[]) {
-    let [ inputFilename ] = argv.slice(2);
-    inputFilename = inputFilename ?? '/dev/stdin';
-    const source = fs.readFileSync(inputFilename, 'utf-8');
+export interface CompileOptions {
+    source: string,
+    name?: string,
+    runtime?: string,
+    module?: 'es6' | 'require' | 'global',
+    global?: string,
+}
+
+export interface CompilerOutput {
+    text: string,
+    map: S.SourceMap,
+}
+
+export function compile(options: CompileOptions): CompilerOutput {
+    const inputFilename = options.name ?? '/dev/stdin';
+    const source = options.source;
+    const moduleType = options.module ?? 'es6';
 
     const scanner = new S.StringScanner(S.startPos(inputFilename), source);
     const reader = new S.LaxReader(scanner);
     let tree = stripShebang(reader.readToEnd());
     let macro = new S.Templates();
 
-    tree = macro.template()`import * as __SYNDICATE__ from '@syndicate/core';\n${tree}`;
+    const runtime = options.runtime ?? '@syndicate/core';
+    switch (moduleType) {
+        case 'es6':
+            tree = macro.template()`import * as __SYNDICATE__ from ${JSON.stringify(runtime)};\n${tree}`;
+            break;
+        case 'require':
+            tree = macro.template()`const __SYNDICATE__ = require(${JSON.stringify(runtime)});\n${tree}`;
+            break;
+        case 'global':
+            tree = macro.template()`const __SYNDICATE__ = ${runtime};\n${tree}`;
+            break;
+    }
 
     let passNumber = 0;
     let expansionNeeded = true;
@@ -167,19 +190,29 @@ export function main(argv: string[]) {
             s => macro.template()`addChildFacet(function (thisFacet) {${s.body}});`);
         expand(
             G.bootStatement,
-            s => macro.template()`export function ${BootProc}(thisFacet) {${s}}`);
+            s => {
+                switch (moduleType) {
+                    case 'es6':
+                        return macro.template()`export function ${BootProc}(thisFacet) {${s}}`;
+                    case 'global':
+                        return macro.template()`module.exports.${BootProc} = function (thisFacet) {${s}};`;
+                    case 'require':
+                        return macro.template()`function ${BootProc}(thisFacet) {${s}}`;
+                }
+            });
         expandFacetAction(
             G.stopStatement,
             s => macro.template()`_stop(function (thisFacet) {${s.body}});`);
     }
 
     // console.log(`\n\n\n======================================== FINAL OUTPUT\n`);
-    console.log(S.itemText(tree));
+    // console.log(S.itemText(tree));
 
     const cw = new S.CodeWriter(inputFilename);
     cw.emit(tree);
-    fs.writeFileSync('/tmp/adhoc.syndicate', cw.text);
-    const mm = cw.map;
-    mm.sourcesContent = [source];
-    fs.writeFileSync('/tmp/adhoc.syndicate.map', JSON.stringify(mm));
+
+    return {
+        text: cw.text,
+        map: cw.map,
+    };
 }
diff --git a/packages/core/src/compiler/index.ts b/packages/core/src/compiler/index.ts
index 05f3c9e..d9c7045 100644
--- a/packages/core/src/compiler/index.ts
+++ b/packages/core/src/compiler/index.ts
@@ -1 +1,4 @@
 export * as Grammar from './grammar.js';
+export * as Internals from './internals.js';
+export * as Codegen from './codegen.js';
+export { compile, CompileOptions } from './codegen.js';