README.ts

#!/usr/bin/env -S deno run --allow-read --allow-run=bash,git,cargo --allow-env --allow-sys

import * as zx from "npm:zx"
import { z, ZodSchema } from "https://deno.land/x/zod@v3.23.8/mod.ts"
import { assertEquals } from "https://jsr.io/@std/assert/1.0.0/equals.ts"
import { assert } from "https://jsr.io/@std/assert/1.0.0/assert.ts"

const CargoToml = z.object({
  package: z.object({
    name: z.string().min(1),
    description: z.string().min(1),
    repository: z.string().url().min(1),
    metadata: z.object({
      details: z.object({
        title: z.string().min(1),
        tagline: z.string(),
        summary: z.string(),
      }),
    }),
  }),
})

type CargoToml = z.infer<typeof CargoToml>

const CargoMetadataSchema = z.object({
  packages: z.array(z.object({
    name: z.string(),
    targets: z.array(z.object({
      name: z.string(),
    })),
  })),
})

type CargoMetadata = z.infer<typeof CargoMetadataSchema>

const Repo = z.object({
  url: z.string().url(),
})

type Repo = z.infer<typeof Repo>

const $ = zx.$({
  cwd: import.meta.dirname,
})

const parse = <T>(schema: ZodSchema<T>, input: zx.ProcessOutput) => schema.parse(JSON.parse(input.stdout))
const renderMarkdownList = (items: string[]) => items.map((bin) => `* ${bin}`).join("\n")

const theCargoToml: CargoToml = parse(CargoToml, await $`yj -t < Cargo.toml`)
const { package: { name, metadata: { details: { title } } } } = theCargoToml
const bin = name
const help = await $`cargo run --quiet --bin ${bin} -- --help`
const theCargoMetadata: CargoMetadata = parse(CargoMetadataSchema, await $`cargo metadata --format-version 1`)
const thePackageMetadata = theCargoMetadata.packages.find((p) => p.name == name)
assert(thePackageMetadata, "Could not find package metadata")
const target = thePackageMetadata.targets[0]
assert(target, "Could not find package first target")
const doc = await $`cargo doc2readme --template README.jl --target-name ${target.name} --out -`
const repo: Repo = parse(Repo, await $`gh repo view --json url`)
const extraBins = (await $`find src/bin/*.rs -type f -exec basename {} .rs \\;`).valueOf().split("\n")

assertEquals(repo.url, theCargoToml.package.repository)

const autogenerated = `
<!-- DO NOT EDIT -->
<!-- This file is automatically generated by README.ts. -->
<!-- Edit README.ts if you want to make changes. -->
`.trim()

console.info(`
${autogenerated}

# ${title}

[![Build](${repo.url}/actions/workflows/ci.yml/badge.svg)](${repo.url})
[![Documentation](https://docs.rs/${name}/badge.svg)](https://docs.rs/${name})

${doc.stdout.trim()}

## Installation

\`\`\`shell
cargo install --locked ${name}
\`\`\`

## Usage

\`\`\`
${help.stdout.trim()}
\`\`\`

## Additional binaries

${renderMarkdownList(extraBins.map((bin) => `\`${bin}\``))}

## Gratitude

Like the project? [⭐ Star this repo](${repo.url}) on GitHub!

## License

[Apache License 2.0](LICENSE-APACHE) or [MIT License](LICENSE-MIT) at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
`.trim())