Add formatted error pages for console and browser

Errors now show app frames highlighted with relative paths and library
frames collapsed, both in ANSI on the console and as a styled HTML page
in the browser. Process-level uncaughtException/unhandledRejection
handlers also use the formatter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -49,6 +49,16 @@ enough libc to run golang binaries.
 
 To run a more complete system, you also need to have docker compose installed.
 
+### Database
+
+To connect to the database, you need psql (PostgreSQL client, for
+`./diachron/common.d/db`)
+
+- macOS: `brew install libpq` (and follow the caveat to add it to your PATH),
+  or `brew install postgresql`
+- Debian/Ubuntu: `apt install postgresql-client`
+- Fedora/RHEL: `dnf install postgresql`
+
 ### Development requirements
 
 To hack on diachron itself, you need the following:

backend/app.ts

@@ -1,171 +1,30 @@
-import express, {
+import{cli}from'./diachron/cli'
-    type Request as ExpressRequest,
+import { formatError } from './diachron/errors';
-    type Response as ExpressResponse,
+
-} from "express";
+process.on('uncaughtException', (err) => {
-import { match } from "path-to-regexp";
+    console.error(formatError(err));
-import { Session } from "./diachron/auth";
+    process.exit(1);
-import { cli } from "./diachron/cli";
+});
-import { contentTypes } from "./diachron/content-types";
+
-import { runWithContext } from "./diachron/context";
+process.on('unhandledRejection', (reason) => {
+    console.error(formatError(reason));
+});
+
 import { core } from "./diachron/core";
-import { httpCodes } from "./diachron/http-codes";
+
-import { request } from "./diachron/request";
-// import { URLPattern } from 'node:url';
-import {
-    AuthenticationRequired,
-    AuthorizationDenied,
-    type Call,
-    type InternalHandler,
-    isRedirect,
-    type Method,
-    massageMethod,
-    methodParser,
-    type ProcessedRoute,
-    type Result,
-    type Route,
-} from "./diachron/types";
 import { routes } from "./routes";
+import {makeApp}from'./diachron/app'
 
-const app = express();
 
-// Parse request bodies
+const app = makeApp({routes});
-app.use(express.json());
+
-app.use(express.urlencoded({ extended: true }));
 
 core.logging.log({ source: "logging", text: ["1"] });
-const processedRoutes: { [K in Method]: ProcessedRoute[] } = {
-    GET: [],
-    POST: [],
-    PUT: [],
-    PATCH: [],
-    DELETE: [],
-};
 
-function _isPromise<T>(value: T | Promise<T>): value is Promise<T> {
-    return typeof (value as any)?.then === "function";
-}
 
-routes.forEach((route: Route, _idx: number, _allRoutes: Route[]) => {
-    // const pattern /*: URLPattern */ = new URLPattern({ pathname: route.path });
-    const matcher = match<Record<string, string>>(route.path);
-    const methodList = route.methods;
 
-    const handler: InternalHandler = async (
-        expressRequest: ExpressRequest,
-    ): Promise<Result> => {
-        const method = massageMethod(expressRequest.method);
 
-        console.log("method", method);
 
-        if (!methodList.includes(method)) {
-            // XXX: Worth asserting this?
-        }
-
-        console.log("request.originalUrl", expressRequest.originalUrl);
-
-        // Authenticate the request
-        const auth = await request.auth.validateRequest(expressRequest);
-
-        const req: Call = {
-            pattern: route.path,
-            path: expressRequest.originalUrl,
-            method,
-            parameters: { one: 1, two: 2 },
-            request: expressRequest,
-            user: auth.user,
-            session: new Session(auth.session, auth.user),
-        };
-
-        try {
-            const retval = await runWithContext({ user: auth.user }, () =>
-                route.handler(req),
-            );
-            return retval;
-        } catch (error) {
-            // Handle authentication errors
-            if (error instanceof AuthenticationRequired) {
-                return {
-                    code: httpCodes.clientErrors.Unauthorized,
-                    contentType: contentTypes.application.json,
-                    result: JSON.stringify({
-                        error: "Authentication required",
-                    }),
-                };
-            }
-            if (error instanceof AuthorizationDenied) {
-                return {
-                    code: httpCodes.clientErrors.Forbidden,
-                    contentType: contentTypes.application.json,
-                    result: JSON.stringify({ error: "Access denied" }),
-                };
-            }
-            throw error;
-        }
-    };
-
-    for (const [_idx, method] of methodList.entries()) {
-        const pr: ProcessedRoute = { matcher, method, handler };
-
-        processedRoutes[method].push(pr);
-    }
-});
-
-async function handler(
-    req: ExpressRequest,
-    _res: ExpressResponse,
-): Promise<Result> {
-    const method = await methodParser.parseAsync(req.method);
-
-    const byMethod = processedRoutes[method];
-    console.log(
-        "DEBUG: req.path =",
-        JSON.stringify(req.path),
-        "method =",
-        method,
-    );
-    for (const [_idx, pr] of byMethod.entries()) {
-        const match = pr.matcher(req.path);
-        console.log("DEBUG: trying pattern, match result =", match);
-        if (match) {
-            console.log("match", match);
-            const resp = await pr.handler(req);
-
-            return resp;
-        }
-    }
-
-    const retval: Result = {
-        code: httpCodes.clientErrors.NotFound,
-        contentType: contentTypes.text.plain,
-        result: "not found!",
-    };
-
-    return retval;
-}
-
-app.use(async (req: ExpressRequest, res: ExpressResponse) => {
-    const result0 = await handler(req, res);
-
-    const code = result0.code.code;
-    const result = result0.result;
-
-    console.log(result);
-
-    // Set any cookies from the result
-    if (result0.cookies) {
-        for (const cookie of result0.cookies) {
-            res.cookie(cookie.name, cookie.value, cookie.options ?? {});
-        }
-    }
-
-    if (isRedirect(result0)) {
-        res.redirect(code, result0.redirect);
-    } else {
-        res.status(code).send(result);
-    }
-});
-
-process.title = `diachron:${cli.listen.port}`;
 
 app.listen(cli.listen.port, cli.listen.host, () => {
     console.log(`Listening on ${cli.listen.host}:${cli.listen.port}`);

backend/build.sh

@@ -6,4 +6,4 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 cd "$DIR"
 
-../cmd pnpm ncc build ./app.ts -o dist
+../cmd pnpm ncc build ./app.ts -o dist --source-map

backend/check-deps.ts

@@ -0,0 +1,66 @@
+import { readFileSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+interface PackageJson {
+    dependencies?: Record<string, string>;
+    devDependencies?: Record<string, string>;
+}
+
+function readPackageJson(path: string): PackageJson {
+    const content = readFileSync(path, "utf-8");
+    return JSON.parse(content);
+}
+
+function getAllDependencyNames(pkg: PackageJson): Set<string> {
+    const names = new Set<string>();
+    for (const name of Object.keys(pkg.dependencies ?? {})) {
+        names.add(name);
+    }
+    for (const name of Object.keys(pkg.devDependencies ?? {})) {
+        names.add(name);
+    }
+    return names;
+}
+
+const diachronPkgPath = join(__dirname, "diachron", "package.json");
+const backendPkgPath = join(__dirname, "package.json");
+
+const diachronPkg = readPackageJson(diachronPkgPath);
+const backendPkg = readPackageJson(backendPkgPath);
+
+const diachronDeps = getAllDependencyNames(diachronPkg);
+const backendDeps = getAllDependencyNames(backendPkg);
+
+const duplicates: string[] = [];
+
+for (const dep of diachronDeps) {
+    if (backendDeps.has(dep)) {
+        duplicates.push(dep);
+    }
+}
+
+if (duplicates.length > 0) {
+    console.error("Error: Duplicate dependencies found.");
+    console.error("");
+    console.error(
+        "The following dependencies exist in both backend/package.json and backend/diachron/package.json:",
+    );
+    console.error("");
+    for (const dep of duplicates.sort()) {
+        console.error(`  - ${dep}`);
+    }
+    console.error("");
+    console.error(
+        "Dependencies in backend/diachron/package.json are provided by the framework",
+    );
+    console.error(
+        "and must not be duplicated in backend/package.json. Remove them from",
+    );
+    console.error("backend/package.json to fix this error.");
+    process.exit(1);
+}
+
+console.log("No duplicate dependencies found.");

backend/check.sh

@@ -11,4 +11,5 @@ out_dir="$check_dir/out"
 source "$check_dir"/../diachron/shims/common
 source "$check_dir"/../diachron/shims/node.common
 
+$ROOT/cmd tsx "$check_dir/check-deps.ts"
 $ROOT/cmd pnpm tsc --outDir "$out_dir"

backend/diachron/app.ts

@@ -0,0 +1,190 @@
+// FIXME: rename this to make-app.ts and adjust imports accordingly
+
+import{contentTypes} from './content-types'
+import{httpCodes}from'./http-codes'
+import express, {
+    type NextFunction,
+    type Request as ExpressRequest,
+    type Response as ExpressResponse,
+} from "express";
+import { formatError, formatErrorHtml } from "./errors";
+import {isRedirect,     InternalHandler,    AuthenticationRequired,
+    AuthorizationDenied, Call,type Method, type ProcessedRoute,methodParser, type Result, type Route,massageMethod } from "./types";
+import { runWithContext } from "./context";
+import { Session } from "./auth";import { request } from "./request";
+import { match } from "path-to-regexp";
+
+import { cli } from "./cli";
+
+type ProcessedRoutes= {[K in Method]: ProcessedRoute[] }
+const processRoutes=(routes:Route[]) :ProcessedRoutes => {
+    const    retval:ProcessedRoutes= {
+        GET: [],
+        POST: [],
+        PUT: [],
+        PATCH: [],
+        DELETE: [],
+    };
+
+    routes.forEach((route: Route, _idx: number, _allRoutes: Route[]) => {
+        // const pattern /*: URLPattern */ = new URLPattern({ pathname: route.path });
+        const matcher = match<Record<string, string>>(route.path);
+        const methodList = route.methods;
+        
+        const handler: InternalHandler = async (
+            expressRequest: ExpressRequest,
+        ): Promise<Result> => {
+            const method = massageMethod(expressRequest.method);
+            
+            console.log("method", method);
+            
+            if (!methodList.includes(method)) {
+                // XXX: Worth asserting this?
+            }
+            
+            console.log("request.originalUrl", expressRequest.originalUrl);
+            
+            // Authenticate the request
+            const auth = await request.auth.validateRequest(expressRequest);
+            
+            const req: Call = {
+                pattern: route.path,
+                path: expressRequest.originalUrl,
+                method,
+                parameters: { one: 1, two: 2 },
+                request: expressRequest,
+                user: auth.user,
+                session: new Session(auth.session, auth.user),
+            };
+            
+            try {
+                const retval = await runWithContext({ user: auth.user }, () =>
+                    route.handler(req),
+                );
+                return retval;
+            } catch (error) {
+                // Handle authentication errors
+                if (error instanceof AuthenticationRequired) {
+                    return {
+                        code: httpCodes.clientErrors.Unauthorized,
+                        contentType: contentTypes.application.json,
+                        result: JSON.stringify({
+                            error: "Authentication required",
+                        }),
+                    };
+                }
+                if (error instanceof AuthorizationDenied) {
+                    return {
+                        code: httpCodes.clientErrors.Forbidden,
+                        contentType: contentTypes.application.json,
+                        result: JSON.stringify({ error: "Access denied" }),
+                    };
+                }
+                throw error;
+            }
+        };
+        
+        for (const [_idx, method] of methodList.entries()) {
+            const pr: ProcessedRoute = { matcher, method, handler };
+            
+          retval[method].push(pr);
+        }
+    });
+    
+    return retval;
+}
+
+type MakeAppArgs={routes:Route[],
+processTitle?: string,
+}
+ 
+const makeApp = ({routes, processTitle}: MakeAppArgs) => {
+    if (process.title) {
+        process.title = `diachron:${cli.listen.port}`;
+    }
+
+const processedRoutes = processRoutes(routes)
+
+async function handler(
+    req: ExpressRequest,
+    _res: ExpressResponse,
+): Promise<Result> {
+    const method = await methodParser.parseAsync(req.method);
+
+    const byMethod = processedRoutes[method];
+    console.log(
+        "DEBUG: req.path =",
+        JSON.stringify(req.path),
+        "method =",
+        method,
+    );
+    for (const [_idx, pr] of byMethod.entries()) {
+        const match = pr.matcher(req.path);
+        console.log("DEBUG: trying pattern, match result =", match);
+        if (match) {
+            console.log("match", match);
+            const resp = await pr.handler(req);
+
+            return resp;
+        }
+    }
+
+    const retval: Result = {
+        code: httpCodes.clientErrors.NotFound,
+        contentType: contentTypes.text.plain,
+        result: "not found!",
+    };
+
+    return retval;
+}
+
+
+    const app = express();
+
+    app.use(express.json())
+
+    app.use(express.urlencoded({ extended: true }));
+
+    app.use(async (req: ExpressRequest, res: ExpressResponse) => {
+        const result0 = await handler(req, res);
+        
+        const code = result0.code.code;
+    const result = result0.result;
+
+    console.log(result);
+
+    // Set any cookies from the result
+    if (result0.cookies) {
+        for (const cookie of result0.cookies) {
+            res.cookie(cookie.name, cookie.value, cookie.options ?? {});
+        }
+    }
+
+    if (isRedirect(result0)) {
+        res.redirect(code, result0.redirect);
+    } else {
+        res.status(code).send(result);
+    }
+    });
+
+    app.use(
+        (
+            err: Error,
+            _req: ExpressRequest,
+            res: ExpressResponse,
+            _next: NextFunction,
+        ) => {
+            console.error(formatError(err));
+            res.status(500).type("html").send(formatErrorHtml(err));
+        },
+    );
+
+return app;
+}
+
+export{makeApp};
+
+function _isPromise<T>(value: T | Promise<T>): value is Promise<T> {
+    return typeof (value as any)?.then === "function";
+}
+

backend/diachron/core/index.ts

@@ -1,5 +1,6 @@
 import nunjucks from "nunjucks";
 import { db, migrate, migrationStatus } from "../database";
+import { formatError, formatErrorHtml } from "../errors";
 import { getLogs, log } from "../logging";
 
 // FIXME: This doesn't belong here; move it somewhere else.
@@ -40,6 +41,7 @@ const misc = {
 const core = {
     conf,
     database,
+    errors: { formatError, formatErrorHtml },
     logging,
     misc,
     random,

backend/diachron/errors.ts

@@ -0,0 +1,229 @@
+// ANSI escape codes
+const bold = "\x1b[1m";
+const red = "\x1b[31m";
+const cyan = "\x1b[36m";
+const dim = "\x1b[2m";
+const reset = "\x1b[0m";
+
+interface ParsedFrame {
+    raw: string;
+    fn: string;
+    file: string;
+    line: string;
+    col: string;
+    isApp: boolean;
+}
+
+const frameRe = /^\s*at\s+(?:(.+?)\s+)?\(?((?:\/|[a-zA-Z]:\\).+?):(\d+):(\d+)\)?$/;
+
+function parseFrame(line: string): ParsedFrame | null {
+    const m = line.match(frameRe);
+    if (!m) return null;
+
+    const fn = m[1] ?? "<anonymous>";
+    const file = m[2];
+    const lineNum = m[3];
+    const col = m[4];
+
+    const isApp =
+        !file.includes("node_modules") && !file.startsWith("node:");
+
+    return { raw: line, fn, file, line: lineNum, col, isApp };
+}
+
+function relativePath(absPath: string): string {
+    const marker = "backend/";
+    const idx = absPath.lastIndexOf(marker);
+    if (idx !== -1) return absPath.slice(idx);
+    return absPath;
+}
+
+function libraryName(file: string): string {
+    const nmIdx = file.indexOf("node_modules/");
+    if (nmIdx === -1) return "node";
+    const after = file.slice(nmIdx + "node_modules/".length);
+    // Handle scoped packages like @scope/pkg
+    if (after.startsWith("@")) {
+        const parts = after.split("/");
+        return `${parts[0]}/${parts[1]}`;
+    }
+    return after.split("/")[0];
+}
+
+interface ParsedError {
+    message: string;
+    frames: ParsedFrame[];
+}
+
+function parseError(error: unknown): ParsedError {
+    if (!(error instanceof Error)) {
+        return { message: String(error), frames: [] };
+    }
+
+    const message = error.message ?? String(error);
+    const stack = error.stack ?? "";
+
+    const lines = stack.split("\n");
+    const frameLines: string[] = [];
+    for (const line of lines) {
+        if (line.trimStart().startsWith("at ")) {
+            frameLines.push(line);
+        }
+    }
+
+    const frames = frameLines
+        .map(parseFrame)
+        .filter((f): f is ParsedFrame => f !== null);
+
+    return { message, frames };
+}
+
+// Group consecutive library frames into collapsed runs
+type FrameGroup =
+    | { kind: "app"; frame: ParsedFrame }
+    | { kind: "lib"; count: number; names: string[] };
+
+function groupFrames(frames: ParsedFrame[]): FrameGroup[] {
+    const groups: FrameGroup[] = [];
+    let i = 0;
+    while (i < frames.length) {
+        if (frames[i].isApp) {
+            groups.push({ kind: "app", frame: frames[i] });
+            i++;
+        } else {
+            const libNames = new Set<string>();
+            let count = 0;
+            while (i < frames.length && !frames[i].isApp) {
+                libNames.add(libraryName(frames[i].file));
+                count++;
+                i++;
+            }
+            groups.push({ kind: "lib", count, names: [...libNames] });
+        }
+    }
+    return groups;
+}
+
+function libSummary(count: number, names: string[]): string {
+    const s = count === 1 ? "" : "s";
+    return `... ${count} internal frame${s} (${names.join(", ")})`;
+}
+
+// --- Console formatting (ANSI) ---
+
+function formatError(error: unknown): string {
+    const { message, frames } = parseError(error);
+    if (frames.length === 0) {
+        return `${bold}${red}ERROR${reset}  ${message}`;
+    }
+
+    const parts: string[] = [];
+    parts.push(`${bold}${red}ERROR${reset}  ${message}`);
+    parts.push("");
+
+    for (const group of groupFrames(frames)) {
+        if (group.kind === "app") {
+            const rel = relativePath(group.frame.file);
+            const loc = `${rel}:${group.frame.line}`;
+            parts.push(
+                `  ${bold}${cyan}${loc.padEnd(24)}${reset}at ${group.frame.fn}`,
+            );
+        } else {
+            parts.push(
+                `  ${dim}${libSummary(group.count, group.names)}${reset}`,
+            );
+        }
+    }
+
+    return parts.join("\n");
+}
+
+// --- HTML formatting (browser) ---
+
+function esc(s: string): string {
+    return s
+        .replace(/&/g, "&amp;")
+        .replace(/</g, "&lt;")
+        .replace(/>/g, "&gt;")
+        .replace(/"/g, "&quot;");
+}
+
+function formatErrorHtml(error: unknown): string {
+    const { message, frames } = parseError(error);
+    const groups = groupFrames(frames);
+
+    let frameRows = "";
+    for (const group of groups) {
+        if (group.kind === "app") {
+            const rel = relativePath(group.frame.file);
+            const loc = `${rel}:${group.frame.line}`;
+            frameRows += `<tr class="app">
+  <td class="loc">${esc(loc)}</td>
+  <td class="fn">at ${esc(group.frame.fn)}</td>
+</tr>\n`;
+        } else {
+            frameRows += `<tr class="lib">
+  <td colspan="2">${esc(libSummary(group.count, group.names))}</td>
+</tr>\n`;
+        }
+    }
+
+    return `<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Error</title>
+<style>
+  * { margin: 0; padding: 0; box-sizing: border-box; }
+  body {
+    font-family: "SF Mono", "Menlo", "Consolas", monospace;
+    font-size: 14px;
+    background: #1a1a2e;
+    color: #e0e0e0;
+    padding: 40px;
+  }
+  .error-label {
+    display: inline-block;
+    background: #e74c3c;
+    color: #fff;
+    font-weight: 700;
+    font-size: 12px;
+    padding: 2px 8px;
+    border-radius: 3px;
+    letter-spacing: 0.5px;
+  }
+  .message {
+    margin-top: 12px;
+    font-size: 18px;
+    font-weight: 600;
+    color: #f8f8f2;
+    line-height: 1.4;
+  }
+  table {
+    margin-top: 24px;
+    border-collapse: collapse;
+  }
+  tr.app td { padding: 4px 0; }
+  tr.app .loc {
+    color: #56d4dd;
+    font-weight: 600;
+    padding-right: 24px;
+    white-space: nowrap;
+  }
+  tr.app .fn { color: #ccc; }
+  tr.lib td {
+    color: #666;
+    padding: 4px 0;
+    font-style: italic;
+  }
+</style>
+</head>
+<body>
+  <span class="error-label">ERROR</span>
+  <div class="message">${esc(message)}</div>
+  <table>${frameRows}</table>
+</body>
+</html>`;
+}
+
+export { formatError, formatErrorHtml };

backend/diachron/package.json

@@ -0,0 +1,39 @@
+{
+    "name": "diachron",
+    "version": "1.0.0",
+    "description": "",
+    "main": "index.js",
+    "scripts": {
+        "test": "DB_PORT=5433 DB_USER=diachron_test DB_PASSWORD=diachron_test DB_NAME=diachron_test tsx --test '**/*.{test,spec}.ts'",
+        "test:watch": "DB_PORT=5433 DB_USER=diachron_test DB_PASSWORD=diachron_test DB_NAME=diachron_test tsx --test --watch '**/*.{test,spec}.ts'",
+        "nodemon": "nodemon dist/index.js",
+        "kysely-codegen": "kysely-codegen"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC",
+    "packageManager": "pnpm@10.12.4",
+    "dependencies": {
+        "@types/node": "^24.10.1",
+        "@types/nunjucks": "^3.2.6",
+        "@vercel/ncc": "^0.38.4",
+        "express": "^5.1.0",
+        "kysely": "^0.28.9",
+        "nodemon": "^3.1.11",
+        "nunjucks": "^3.2.4",
+        "path-to-regexp": "^8.3.0",
+        "pg": "^8.16.3",
+        "ts-luxon": "^6.2.0",
+        "ts-node": "^10.9.2",
+        "tsx": "^4.20.6",
+        "typeid-js": "^1.2.0",
+        "typescript": "^5.9.3",
+        "zod": "^4.1.12"
+    },
+    "devDependencies": {
+        "@biomejs/biome": "2.3.10",
+        "@types/express": "^5.0.5",
+        "@types/pg": "^8.16.0",
+        "kysely-codegen": "^0.19.0"
+    }
+}

backend/package.json

@@ -1,6 +1,6 @@
 {
-    "name": "express",
+    "name": "my app",
-    "version": "1.0.0",
+    "version": "0.0.1",
     "description": "",
     "main": "index.js",
     "scripts": {
@@ -14,26 +14,8 @@
     "license": "ISC",
     "packageManager": "pnpm@10.12.4",
     "dependencies": {
-        "@types/node": "^24.10.1",
+        "diachron": "workspace:*"
-        "@types/nunjucks": "^3.2.6",
-        "@vercel/ncc": "^0.38.4",
-        "express": "^5.1.0",
-        "kysely": "^0.28.9",
-        "nodemon": "^3.1.11",
-        "nunjucks": "^3.2.4",
-        "path-to-regexp": "^8.3.0",
-        "pg": "^8.16.3",
-        "ts-luxon": "^6.2.0",
-        "ts-node": "^10.9.2",
-        "tsx": "^4.20.6",
-        "typeid-js": "^1.2.0",
-        "typescript": "^5.9.3",
-        "zod": "^4.1.12"
     },
     "devDependencies": {
-        "@biomejs/biome": "2.3.10",
-        "@types/express": "^5.0.5",
-        "@types/pg": "^8.16.0",
-        "kysely-codegen": "^0.19.0"
     }
 }

backend/pnpm-workspace.yaml

@@ -0,0 +1,2 @@
+packages:
+  - 'diachron'

backend/run.sh

@@ -6,4 +6,4 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 cd "$DIR"
 
-exec ../cmd node dist/index.js "$@"
+exec ../cmd node --enable-source-maps dist/index.js "$@"

backend/tsconfig.json

@@ -10,5 +10,5 @@
         "types": ["node"],
         "outDir": "out"
     },
-    "exclude": ["**/*.spec.ts", "**/*.test.ts"]
+    "exclude": ["**/*.spec.ts", "**/*.test.ts", "check-deps.ts"]
 }

bootstrap.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+# shellcheck disable=SC2002
+
+set -eu
+set -o pipefail
+IFS=$'\n\t'
+
+# print useful message on failure
+trap 's=$?; echo >&2 "$0: Error on line "$LINENO": $BASH_COMMAND"; exit $s' ERR
+
+# shellcheck disable=SC2034
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# cd "$DIR"
+here="$PWD"
+
+"$DIR/update-cached-repository.sh"
+
+# repository="${2:-https://gitea.philologue.net/philologue/diachron}"
+repository="${2:-$HOME/.cache/diachron/v1/repositories/diachron.git}"
+ref="${1:-hydrators-kysely}"
+
+echo will bootstrap ref "$ref" of repo "$repository"
+
+into=$(mktemp -d)
+cd "$into"
+echo I am in $(pwd)
+echo I will clone repository "$repository", ref "$ref"
+git clone "$repository"
+
+r=$(ls -1)
+
+cd "$r"
+
+echo I am in $(pwd)
+
+git checkout "$ref"
+
+ls
+echo working dir: $PWD
+# ls backend
+
+# exit 0
+
+tar cvf - $(cat "$PWD/file-list" | grep -v '^#') | (cd "$here" && tar xf -)
+
+echo "$ref" > .diachron-version
+
+echo "Now, run the command ./sync.sh"

diachron/common.d/check-deps

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -eu
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+ROOT="$DIR/../.."
+
+cd "$ROOT/backend/diachron"
+
+"$ROOT/cmd" tsx check-deps.ts "$@"

diachron/common.d/migrate

@@ -5,5 +5,5 @@ set -eu
 DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 ROOT="$DIR/../.."
 
-cd "$ROOT/backend"
+cd "$ROOT/backend/diachron"
 "$DIR"/tsx migrate.ts "$@"

diachron/develop.d/check-deps

@@ -0,0 +1 @@
+../common.d/check-deps

diachron/develop.d/tsx

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+"$DIR"/../shims/pnpm tsx "$@"

diachron/mgmt.d/check-deps

@@ -0,0 +1 @@
+../common.d/check-deps

diachron/mgmt.d/tsx

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+"$DIR"/../shims/pnpm tsx "$@"

file-list

@@ -0,0 +1,16 @@
+# please keep this file sorted alphabetically
+
+backend/diachron
+backend/package.json
+backend/pnpm-workspace.yaml
+# express/framework
+cmd
+file-list
+develop
+diachron
+logger
+master
+mgmt
+sync.sh
+templates
+upgrade.sh

sync.sh

@@ -1,7 +1,5 @@
 #!/bin/bash
 
-# Note: This is kind of AI slop and needs to be more carefully reviewed.
-
 set -eu
 
 DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
@@ -25,50 +23,66 @@ pnpm_checksum_var="pnpm_checksum_${platform}"
 pnpm_binary_url="${!pnpm_binary_var}"
 pnpm_checksum="${!pnpm_checksum_var}"
 
-# Set up paths for shims to use
+cache_dir="$HOME/.cache/diachron/v1/binaries"
-nodejs_dist_dir="diachron/binaries/$nodejs_dirname"
+local_dir="$DIR/diachron/binaries"
-nodejs_bin_dir="$nodejs_dist_dir/bin"
+mkdir -p "$cache_dir" "$local_dir"
 
-# Ensure correct node version is installed
+# read_checksum_file <path>
-node_installed_checksum_file="$DIR/diachron/binaries/.node.checksum"
+# Prints the contents of a checksum file, or empty string
-node_installed_checksum=""
+# if the file does not exist.
-if [ -f "$node_installed_checksum_file" ]; then
+read_checksum_file() {
-    node_installed_checksum=$(cat "$node_installed_checksum_file")
+    if [ -f "$1" ]; then
+        cat "$1"
     fi
+}
 
-if [ "$node_installed_checksum" != "$nodejs_checksum" ]; then
+# Ensure Node.js is in the cache
+cached_node_checksum=$(read_checksum_file "$cache_dir/.node.checksum")
+if [ "$cached_node_checksum" != "$nodejs_checksum" ]; then
     echo "Downloading Node.js for $platform..."
-    node_archive="$DIR/diachron/downloads/node.tar.xz"
+    node_archive="$cache_dir/node.tar.xz"
     curl -fsSL "$nodejs_binary" -o "$node_archive"
 
     echo "Verifying checksum..."
     echo "$nodejs_checksum  $node_archive" | sha256_check
 
     echo "Extracting Node.js..."
-    tar -xf "$node_archive" -C "$DIR/diachron/binaries"
+    rm -rf "${cache_dir:?}/$nodejs_dirname"
+    tar -xf "$node_archive" -C "$cache_dir"
     rm "$node_archive"
 
-    echo "$nodejs_checksum" >"$node_installed_checksum_file"
+    echo "$nodejs_checksum" >"$cache_dir/.node.checksum"
 fi
 
-# Ensure correct pnpm version is installed
+# Copy Node.js into the working directory if needed
-pnpm_binary="$DIR/diachron/binaries/pnpm"
+local_node_checksum=$(read_checksum_file "$local_dir/.node.checksum")
-pnpm_installed_checksum_file="$DIR/diachron/binaries/.pnpm.checksum"
+if [ "$local_node_checksum" != "$nodejs_checksum" ]; then
-pnpm_installed_checksum=""
+    echo "Installing Node.js into project..."
-if [ -f "$pnpm_installed_checksum_file" ]; then
+    rm -rf "${local_dir:?}/$nodejs_dirname"
-    pnpm_installed_checksum=$(cat "$pnpm_installed_checksum_file")
+    cp -R "$cache_dir/$nodejs_dirname" "$local_dir/$nodejs_dirname"
+    echo "$nodejs_checksum" >"$local_dir/.node.checksum"
 fi
 
-if [ "$pnpm_installed_checksum" != "$pnpm_checksum" ]; then
+# Ensure pnpm is in the cache
+cached_pnpm_checksum=$(read_checksum_file "$cache_dir/.pnpm.checksum")
+if [ "$cached_pnpm_checksum" != "$pnpm_checksum" ]; then
     echo "Downloading pnpm for $platform..."
-    curl -fsSL "$pnpm_binary_url" -o "$pnpm_binary"
+    curl -fsSL "$pnpm_binary_url" -o "$cache_dir/pnpm"
 
     echo "Verifying checksum..."
-    echo "$pnpm_checksum  $pnpm_binary" | sha256_check
+    echo "$pnpm_checksum  $cache_dir/pnpm" | sha256_check
 
-    chmod +x "$pnpm_binary"
+    chmod +x "$cache_dir/pnpm"
 
-    echo "$pnpm_checksum" >"$pnpm_installed_checksum_file"
+    echo "$pnpm_checksum" >"$cache_dir/.pnpm.checksum"
+fi
+
+# Copy pnpm into the working directory if needed
+local_pnpm_checksum=$(read_checksum_file "$local_dir/.pnpm.checksum")
+if [ "$local_pnpm_checksum" != "$pnpm_checksum" ]; then
+    echo "Installing pnpm into project..."
+    cp "$cache_dir/pnpm" "$local_dir/pnpm"
+    echo "$pnpm_checksum" >"$local_dir/.pnpm.checksum"
 fi
 
 # Get golang binaries in place

update-cached-repository.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -eu
+set -o pipefail
+IFS=$'\n\t'
+
+trap 's=$?; echo >&2 "$0: Error on line "$LINENO": $BASH_COMMAND"; exit $s' ERR
+
+upstream=https://gitea.philologue.net/philologue/diachron
+cache_dir="$HOME/.cache/diachron/v1/repositories"
+cached_repo="$cache_dir/diachron.git"
+
+mkdir -p "$cache_dir"
+
+if [ -d "$cached_repo" ]; then
+    echo "Updating cached repository..."
+    git -C "$cached_repo" fetch --prune origin
+else
+    echo "Creating cached repository..."
+    git clone --mirror "$upstream" "$cached_repo"
+fi
+

upgrade.sh

@@ -0,0 +1,109 @@
+#!/bin/bash
+
+set -eu
+set -o pipefail
+IFS=$'\n\t'
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+new_ref="${1:?Usage: upgrade.sh <new-ref>}"
+
+cached_repo="$HOME/.cache/diachron/v1/repositories/diachron.git"
+tmpdir=""
+
+cleanup() {
+    if [ -n "$tmpdir" ]; then
+        rm -rf "$tmpdir"
+    fi
+}
+trap cleanup EXIT
+
+echo "=== Diachron Framework Upgrade ==="
+echo ""
+echo "This will replace all framework files in your project."
+echo "Make sure you have committed or backed up any local changes."
+echo ""
+read -r -p "Continue? [y/N] " answer
+if [[ ! "$answer" =~ ^[Yy]$ ]]; then
+    echo "Aborted."
+    exit 0
+fi
+
+# Update cached repository
+"$DIR/update-cached-repository.sh"
+
+# Read current version
+if [ ! -f "$DIR/.diachron-version" ]; then
+    echo "Error: .diachron-version not found." >&2
+    echo "Is this a diachron project?" >&2
+    exit 1
+fi
+old_ref=$(cat "$DIR/.diachron-version")
+
+# Verify both refs exist in cached repo
+if ! git -C "$cached_repo" rev-parse --verify "$old_ref^{commit}" >/dev/null 2>&1; then
+    echo "Error: current version '$old_ref' not found in cached repository." >&2
+    exit 1
+fi
+if ! git -C "$cached_repo" rev-parse --verify "$new_ref^{commit}" >/dev/null 2>&1; then
+    echo "Error: target version '$new_ref' not found in cached repository." >&2
+    exit 1
+fi
+
+# Require a clean working tree
+if [ -n "$(git -C "$DIR" status --porcelain)" ]; then
+    echo "Error: working tree is not clean." >&2
+    echo "Commit or stash all changes (including untracked files) before upgrading." >&2
+    exit 1
+fi
+
+echo ""
+echo "Upgrading: $old_ref -> $new_ref"
+echo ""
+
+# Read current file-list (files to remove)
+old_files=()
+while IFS= read -r line; do
+    [[ "$line" =~ ^[[:space:]]*# ]] && continue
+    [[ -z "$line" ]] && continue
+    old_files+=("$line")
+done < "$DIR/file-list"
+
+# Clone and checkout new version into a temp directory
+tmpdir=$(mktemp -d)
+git clone --quiet "$cached_repo" "$tmpdir/diachron"
+git -C "$tmpdir/diachron" checkout --quiet "$new_ref"
+
+# Read new file-list (files to add)
+new_files=()
+while IFS= read -r line; do
+    [[ "$line" =~ ^[[:space:]]*# ]] && continue
+    [[ -z "$line" ]] && continue
+    new_files+=("$line")
+done < "$tmpdir/diachron/file-list"
+
+# Remove old framework files
+for f in "${old_files[@]}"; do
+    git -C "$DIR" rm -rf --quiet --ignore-unmatch "$f"
+done
+
+# Copy in new framework files
+(cd "$tmpdir/diachron" && tar cvf - "${new_files[@]}") | (cd "$DIR" && tar xf -)
+
+# Stage them
+for f in "${new_files[@]}"; do
+    git -C "$DIR" add "$f"
+done
+
+# Update version marker
+echo "$new_ref" > "$DIR/.diachron-version"
+git -C "$DIR" add "$DIR/.diachron-version"
+
+echo "=== Upgrade staged: $old_ref -> $new_ref ==="
+echo ""
+echo "Framework files have been removed, replaced, and staged."
+echo ""
+echo "Next steps:"
+echo "  1. Review:   git diff --cached"
+echo "  2. Commit:   git commit -m 'Upgrade diachron to $new_ref'"
+echo "  3. Install:  ./sync.sh"