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✨ Add Main api #1102

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Merged
cowboyd merged 1 commit into from
Feb 5, 2026
+105 −89
Merged

✨ Add Main api #1102

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9 changes: 9 additions & 0 deletions lib/api.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -20,11 +20,20 @@ export const api = {
return delete (scope as ScopeInternal).contexts[context.name];
},
}),
Main: createApi("Main", {
main() {
throw new TypeError(`missing handler for "main()"`);
},
}),
} as {
Scope: Api<{
create(parent: Scope): [Scope, () => Operation<void>];
destroy(scope: Scope): Operation<void>;
set<T>(scope: Scope, context: Context<T>, value: T): T;
delete<T>(scope: Scope, context: Context<T>): boolean;
}>;

Main: Api<{
main: (body: (args: string[]) => Operation<void>) => Promise<void>;
}>;
};
185 changes: 96 additions & 89 deletions lib/main.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,9 @@ import { createContext } from "./context.ts";
import type { Operation } from "./types.ts";
import { callcc } from "./callcc.ts";
import { run } from "./run.ts";
import { useScope } from "./scope.ts";
import { global, useScope } from "./scope.ts";
import { call } from "./call.ts";
import { api } from "./api.ts";

/**
* Halt process execution immediately and initiate shutdown. If a message is
Expand Down Expand Up @@ -58,103 +59,109 @@ export function* exit(status: number, message?: string): Operation<void> {
* @returns a promise that resolves right after the program exits
*/

export async function main(
export function main(
body: (args: string[]) => Operation<void>,
): Promise<void> {
let hardexit = (_status: number) => {};

let result = await run(() =>
callcc<Exit>(function* (resolve) {
// action will return shutdown immediately upon resolve, so stash
// this function in the exit context so it can be called anywhere.
yield* ExitContext.set(resolve);

// this will hold the event loop and prevent runtimes such as
// Node and Deno from exiting prematurely.
let interval = setInterval(() => {}, Math.pow(2, 30));

let scope = yield* useScope();

try {
let interrupt = {
SIGINT: () =>
scope.run(() => resolve({ status: 130, signal: "SIGINT" })),
SIGTERM: () =>
scope.run(() => resolve({ status: 143, signal: "SIGTERM" })),
};

yield* withHost({
*deno() {
hardexit = (status) => Deno.exit(status);
try {
Deno.addSignalListener("SIGINT", interrupt.SIGINT);
/**
* Windows only supports ctrl-c (SIGINT), ctrl-break (SIGBREAK), and ctrl-close (SIGUP)
*/
if (Deno.build.os !== "windows") {
Deno.addSignalListener("SIGTERM", interrupt.SIGTERM);
}
yield* body(Deno.args.slice());
} finally {
Deno.removeSignalListener("SIGINT", interrupt.SIGINT);
if (Deno.build.os !== "windows") {
Deno.removeSignalListener("SIGTERM", interrupt.SIGTERM);
return api.Main.invoke(global, "main", [body]);
}

global.around(api.Main, {
async main([body]) {
let hardexit = (_status: number) => {};

let result = await run(() =>
callcc<Exit>(function* (resolve) {
// action will return shutdown immediately upon resolve, so stash
// this function in the exit context so it can be called anywhere.
yield* ExitContext.set(resolve);

// this will hold the event loop and prevent runtimes such as
// Node and Deno from exiting prematurely.
let interval = setInterval(() => {}, Math.pow(2, 30));

let scope = yield* useScope();

try {
let interrupt = {
SIGINT: () =>
scope.run(() => resolve({ status: 130, signal: "SIGINT" })),
SIGTERM: () =>
scope.run(() => resolve({ status: 143, signal: "SIGTERM" })),
};

yield* withHost({
*deno() {
hardexit = (status) => Deno.exit(status);
try {
Deno.addSignalListener("SIGINT", interrupt.SIGINT);
/**
* Windows only supports ctrl-c (SIGINT), ctrl-break (SIGBREAK), and ctrl-close (SIGUP)
*/
if (Deno.build.os !== "windows") {
Deno.addSignalListener("SIGTERM", interrupt.SIGTERM);
}
yield* body(Deno.args.slice());
} finally {
Deno.removeSignalListener("SIGINT", interrupt.SIGINT);
if (Deno.build.os !== "windows") {
Deno.removeSignalListener("SIGTERM", interrupt.SIGTERM);
}
}
}
},
*node() {
// Annotate dynamic import so that webpack ignores it.
// See https://webpack.js.org/api/module-methods/#webpackignore
let { default: process } = yield* call(() =>
import(/* webpackIgnore: true */ "node:process")
);
hardexit = (status) => process.exit(status);
try {
process.on("SIGINT", interrupt.SIGINT);
if (process.platform !== "win32") {
process.on("SIGTERM", interrupt.SIGTERM);
},
*node() {
// Annotate dynamic import so that webpack ignores it.
// See https://webpack.js.org/api/module-methods/#webpackignore
let { default: process } = yield* call(() =>
import(/* webpackIgnore: true */ "node:process")
);
hardexit = (status) => process.exit(status);
try {
process.on("SIGINT", interrupt.SIGINT);
if (process.platform !== "win32") {
process.on("SIGTERM", interrupt.SIGTERM);
}
yield* body(process.argv.slice(2));
} finally {
process.off("SIGINT", interrupt.SIGINT);
if (process.platform !== "win32") {
process.off("SIGTERM", interrupt.SIGINT);
}
}
yield* body(process.argv.slice(2));
} finally {
process.off("SIGINT", interrupt.SIGINT);
if (process.platform !== "win32") {
process.off("SIGTERM", interrupt.SIGINT);
},
*browser() {
try {
self.addEventListener("unload", interrupt.SIGINT);
yield* body([]);
} finally {
self.removeEventListener("unload", interrupt.SIGINT);
}
}
},
*browser() {
try {
self.addEventListener("unload", interrupt.SIGINT);
yield* body([]);
} finally {
self.removeEventListener("unload", interrupt.SIGINT);
}
},
});

yield* exit(0);
} catch (error) {
yield* resolve({ status: 1, error: error as Error });
} finally {
clearInterval(interval);
},
});

yield* exit(0);
} catch (error) {
yield* resolve({ status: 1, error: error as Error });
} finally {
clearInterval(interval);
}
})
);

if (result.message) {
if (result.status === 0) {
console.log(result.message);
} else {
console.error(result.message);
}
})
);

if (result.message) {
if (result.status === 0) {
console.log(result.message);
} else {
console.error(result.message);
}
}

if (result.error) {
console.error(result.error);
}
if (result.error) {
console.error(result.error);
}

hardexit(result.status);
}
hardexit(result.status);
},
});

const ExitContext = createContext<(exit: Exit) => Operation<void>>("exit");

Expand Down
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