diff --git a/bun.lockb b/bun.lockb
index e2b0ebf8..439585a9 100644
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/scripts/cfg-helper.ts b/scripts/cfg-helper.ts
new file mode 100644
index 00000000..7fc12f80
--- /dev/null
+++ b/scripts/cfg-helper.ts
@@ -0,0 +1,14 @@
+import type Parser from "web-tree-sitter";
+import { type CFG, mergeNodeAttrs } from "../src/control-flow/cfg-defs.ts";
+import { type Language, newCFGBuilder } from "../src/control-flow/cfg.ts";
+import { simplifyCFG, trimFor } from "../src/control-flow/graph-ops.ts";
+
+export function buildCFG(func: Parser.SyntaxNode, language: Language): CFG {
+  const builder = newCFGBuilder(language, { flatSwitch: true });
+
+  let cfg = builder.buildCFG(func);
+
+  cfg = trimFor(cfg);
+  cfg = simplifyCFG(cfg, mergeNodeAttrs);
+  return cfg;
+}
diff --git a/scripts/render-function.ts b/scripts/render-function.ts
index 15e5fd06..61d0fe29 100644
--- a/scripts/render-function.ts
+++ b/scripts/render-function.ts
@@ -2,15 +2,17 @@ import * as path from "node:path";
 import { parseArgs } from "node:util";
 import { Graphviz } from "@hpcc-js/wasm-graphviz";
 import type Parser from "web-tree-sitter";
-import { type CFG, mergeNodeAttrs } from "../src/control-flow/cfg-defs.ts";
+import type { SyntaxNode } from "web-tree-sitter";
+import { type Language, supportedLanguages } from "../src/control-flow/cfg.ts";
 import {
-  type Language,
-  newCFGBuilder,
-  supportedLanguages,
-} from "../src/control-flow/cfg.ts";
-import { simplifyCFG, trimFor } from "../src/control-flow/graph-ops.ts";
+  deserializeColorList,
+  getDarkColorList,
+  getLightColorList,
+  listToScheme,
+} from "../src/control-flow/colors.ts";
 import { graphToDot } from "../src/control-flow/render.ts";
 import { getLanguage, iterFunctions } from "../src/file-parsing/bun.ts";
+import { buildCFG } from "./cfg-helper.ts";
 
 function isLanguage(language: string): language is Language {
   return supportedLanguages.includes(language as Language);
@@ -24,20 +26,30 @@ function normalizeFuncdef(funcdef: string): string {
     .trim();
 }
 
-function buildCFG(func: Parser.SyntaxNode, language: Language): CFG {
-  const builder = newCFGBuilder(language, { flatSwitch: true });
-
-  let cfg = builder.buildCFG(func);
-
-  cfg = trimFor(cfg);
-  cfg = simplifyCFG(cfg, mergeNodeAttrs);
-  return cfg;
+export function getFuncDef(sourceCode: string, func: SyntaxNode): string {
+  const body = func.childForFieldName("body");
+  if (!body) {
+    throw new Error("No function body");
+  }
+  return normalizeFuncdef(sourceCode.slice(func.startIndex, body.startIndex));
 }
 
 function writeError(message: string): void {
   Bun.write(Bun.stderr, `${message}\n`);
 }
 
+export async function getColorScheme(colors?: string) {
+  if (!colors || colors === "dark") {
+    return listToScheme(getDarkColorList());
+  }
+  if (colors === "light") {
+    return listToScheme(getLightColorList());
+  }
+  return colors
+    ? listToScheme(deserializeColorList(await Bun.file(colors).text()))
+    : undefined;
+}
+
 async function main() {
   process.on("SIGINT", () => {
     // close watcher when Ctrl-C is pressed
@@ -58,6 +70,9 @@ async function main() {
       out: {
         type: "string",
       },
+      colors: {
+        type: "string",
+      },
     },
     strict: true,
     allowPositionals: true,
@@ -79,15 +94,26 @@ async function main() {
 
   const possibleMatches: { name: string; func: Parser.SyntaxNode }[] = [];
   const sourceCode = await Bun.file(filepath).text();
+  const startIndex = Number.parseInt(functionName);
+  let startPosition: { row: number; column: number } | undefined;
+  try {
+    startPosition = JSON.parse(functionName);
+  } catch {
+    startPosition = undefined;
+  }
   for (const func of iterFunctions(sourceCode, language)) {
-    const body = func.childForFieldName("body");
-    if (!body) {
+    let funcDef: string;
+    try {
+      funcDef = getFuncDef(sourceCode, func);
+    } catch {
       continue;
     }
-    const funcDef = normalizeFuncdef(
-      sourceCode.slice(func.startIndex, body.startIndex),
-    );
-    if (funcDef.includes(functionName)) {
+    if (
+      funcDef.includes(functionName) ||
+      startIndex === func.startIndex ||
+      (startPosition?.row === func.startPosition.row &&
+        startPosition.column === func.startPosition.column)
+    ) {
       possibleMatches.push({ name: funcDef, func: func });
     }
   }
@@ -108,7 +134,10 @@ async function main() {
   const func: Parser.SyntaxNode = possibleMatches[0].func;
   const graphviz = await Graphviz.load();
   const cfg = buildCFG(func, language);
-  const svg = graphviz.dot(graphToDot(cfg));
+
+  const colorScheme = await getColorScheme(values.colors);
+
+  const svg = graphviz.dot(graphToDot(cfg, false, undefined, colorScheme));
 
   if (values.out) {
     await Bun.write(values.out, svg);
@@ -117,4 +146,6 @@ async function main() {
   }
 }
 
-await main();
+if (require.main === module) {
+  await main();
+}
diff --git a/scripts/render-graph.ts b/scripts/render-graph.ts
index 622b9948..acf90d7b 100644
--- a/scripts/render-graph.ts
+++ b/scripts/render-graph.ts
@@ -7,14 +7,21 @@ import type {
   GraphNode,
 } from "../src/control-flow/cfg-defs.ts";
 import { graphToDot } from "../src/control-flow/render.ts";
+import { getColorScheme } from "./render-function.ts";
 
 async function main() {
   const {
+    values,
     positionals: [_runtime, _this, gist_url],
   } = parseArgs({
     args: Bun.argv,
     strict: true,
     allowPositionals: true,
+    options: {
+      colors: {
+        type: "string",
+      },
+    },
   });
 
   if (!gist_url) {
@@ -39,11 +46,11 @@ async function main() {
     throw new Error("No entry found");
   }
   const cfg: CFG = { graph, entry, offsetToNode: [] };
-  const dot = graphToDot(cfg);
+  const colorScheme = await getColorScheme(values.colors);
+
   const graphviz = await Graphviz.load();
-  const svg = graphviz.dot(dot);
+  const svg = graphviz.dot(graphToDot(cfg, false, undefined, colorScheme));
   console.log(svg);
-  // console.log(dot);
 }
 
 if (require.main === module) {
diff --git a/scripts/scan-codebase.ts b/scripts/scan-codebase.ts
index d6b452f9..e202e3b8 100644
--- a/scripts/scan-codebase.ts
+++ b/scripts/scan-codebase.ts
@@ -8,44 +8,121 @@ import * as path from "node:path";
  */
 import { parseArgs } from "node:util";
 import { Glob } from "bun";
-import { newCFGBuilder } from "../src/control-flow/cfg";
 import {
   fileTypes,
   getLanguage,
   iterFunctions,
 } from "../src/file-parsing/bun.ts";
+import { buildCFG } from "./cfg-helper.ts";
+import { getFuncDef } from "./render-function.ts";
 
-function iterSourceFiles(root: string): IterableIterator<string> {
+export function iterSourceFiles(root: string): IterableIterator<string> {
   const sourceGlob = new Glob(
     `**/*.{${fileTypes.map(({ ext }) => ext).join(",")}}`,
   );
   return sourceGlob.scanSync(root);
 }
+function* iterFilenames(
+  root: string,
+  dirsToInclude: string[],
+): IterableIterator<string> {
+  if (dirsToInclude.length === 1 && dirsToInclude[0] === "*") {
+    yield* iterSourceFiles(root);
+  } else {
+    for (const dir of dirsToInclude) {
+      for (const filename of iterSourceFiles(path.join(root, dir))) {
+        // We want the path relative to the root
+        yield path.join(dir, filename);
+      }
+    }
+  }
+}
+
+async function* iterFunctionInfo(
+  root: string,
+  filenames: IterableIterator<string>,
+): AsyncIterableIterator<{
+  node_count: number;
+  start_position: { row: number; column: number };
+  funcdef: string;
+  filename: string;
+}> {
+  for (const filename of filenames) {
+    const code = await Bun.file(path.join(root, filename)).text();
+    const language = getLanguage(filename);
+    for (const func of iterFunctions(code, language)) {
+      const cfg = buildCFG(func, language);
+      yield {
+        node_count: cfg.graph.order,
+        start_position: func.startPosition,
+        funcdef: getFuncDef(code, func),
+        filename: filename.replaceAll("\\", "/"),
+      };
+    }
+  }
+}
+
+async function generateIndex(
+  /** Project name on GitHub */
+  project: string,
+  /** Git ref */
+  ref: string,
+  /** Root on local filesystem */
+  root: string,
+  /** Directories to index, relative to the root */
+  dirsToInclude: string[],
+) {
+  const filenames = iterFilenames(root, dirsToInclude);
+  const functions = await Array.fromAsync(iterFunctionInfo(root, filenames));
+  return {
+    version: 1,
+    content: {
+      index_type: "github",
+      project,
+      ref,
+      functions,
+    },
+  };
+}
 
 async function main() {
-  const { values } = parseArgs({
+  const {
+    values,
+    positionals: [_runtime, _this, ...dirsToInclude],
+  } = parseArgs({
     args: Bun.argv,
     options: {
+      project: {
+        type: "string",
+      },
+      ref: {
+        type: "string",
+      },
       root: {
         type: "string",
       },
+      out: {
+        type: "string",
+      },
     },
     strict: true,
     allowPositionals: true,
   });
 
-  const root = values.root ?? ".";
+  if (!values.project || !values.ref || !values.root) {
+    throw new Error("Missing arguments");
+  }
 
-  for (const filename of iterSourceFiles(root)) {
-    const filepath = path.join(root, filename);
-    const code = await Bun.file(filepath).text();
-    const language = getLanguage(filename);
-    for (const func of iterFunctions(code, language)) {
-      const builder = newCFGBuilder(language, {});
-      const cfg = builder.buildCFG(func);
-      console.log(filepath, func.startPosition, cfg.graph.order);
-    }
+  const output = JSON.stringify(
+    await generateIndex(values.project, values.ref, values.root, dirsToInclude),
+  );
+  if (values.out) {
+    await Bun.write(values.out, output);
+  } else {
+    await Bun.write(Bun.stdout, output);
   }
 }
 
-await main();
+if (require.main === module) {
+  await main();
+}