commit ea59080a5dbfadcde0d929cfeb6e6acefa9c1e84
Author: kitsunecafe <rowan@kitsu.cafe>
Date:   Tue Nov 5 01:41:38 2024 -0600

    initial crime

diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..49a0a69
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,68 @@
+{
+  "name": "bevy-cli",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "bevy-cli",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "mini-hamt": "^1.0.3",
+        "minimist": "^1.2.8",
+        "rambda": "^9.3.0",
+        "smol-toml": "^1.3.0"
+      }
+    },
+    "node_modules/@f/hash-str": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@f/hash-str/-/hash-str-1.0.0.tgz",
+      "integrity": "sha512-qVQ416Lug2QuN3OW39+4CCDybWVABfAvyydlr9n1xwkE/U1XKB7BC2th1EH02f7P+zr5foycsNisppRKYf+L2Q==",
+      "license": "MIT"
+    },
+    "node_modules/@f/popcount": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@f/popcount/-/popcount-1.0.0.tgz",
+      "integrity": "sha512-o6ctcKVEfiVLF2cPSdhR815dpVW4d3KijBu20jcxTbF6NFTV2sO/2+ffFn6NMgiVv3gv/4mVtOF92MYGtrfmew==",
+      "license": "MIT"
+    },
+    "node_modules/mini-hamt": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/mini-hamt/-/mini-hamt-1.0.3.tgz",
+      "integrity": "sha512-kL1xAjkZl4tWZ2QYNBMbpvmt0QJRIOoMxmdnXtJyPn/6jrBr/TKRbyJRNTsrjcGxlaudR2+CmLPlko7B5IdZJA==",
+      "license": "MIT",
+      "dependencies": {
+        "@f/hash-str": "^1.0.0",
+        "@f/popcount": "^1.0.0"
+      }
+    },
+    "node_modules/minimist": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
+      "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/rambda": {
+      "version": "9.3.0",
+      "resolved": "https://registry.npmjs.org/rambda/-/rambda-9.3.0.tgz",
+      "integrity": "sha512-cl/7DCCKNxmsbc0dXZTJTY08rvDdzLhVfE6kPBson1fWzDapLzv0RKSzjpmAqP53fkQqAvq05gpUVHTrUNsuxg==",
+      "license": "MIT"
+    },
+    "node_modules/smol-toml": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/smol-toml/-/smol-toml-1.3.0.tgz",
+      "integrity": "sha512-tWpi2TsODPScmi48b/OQZGi2lgUmBCHy6SZrhi/FdnnHiU1GwebbCfuQuxsC3nHaLwtYeJGPrDZDIeodDOc4pA==",
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/cyyynthia"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..b1b9455
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "bevy-cli",
+  "version": "1.0.0",
+  "main": "src/index.js",
+  "type": "module",
+  "scripts": {
+    "start": "node src/index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "mini-hamt": "^1.0.3",
+    "minimist": "^1.2.8",
+    "rambda": "^9.3.0",
+    "smol-toml": "^1.3.0"
+  }
+}
diff --git a/src/cargo.js b/src/cargo.js
new file mode 100644
index 0000000..b3911f3
--- /dev/null
+++ b/src/cargo.js
@@ -0,0 +1,10 @@
+import { promisify } from 'node:util'
+import { exec as _exec } from 'node:child_process'
+
+const exec = promisify(_exec)
+
+export const Cargo = Object.freeze({
+    init: path => exec(`cargo new ${path}`),
+    add: lib => exec(`cargo add ${lib}`)
+})
+
diff --git a/src/config.js b/src/config.js
new file mode 100644
index 0000000..68112d1
--- /dev/null
+++ b/src/config.js
@@ -0,0 +1,149 @@
+import npath from 'node:path'
+import { assoc, concat, curry, curryN, lens, merge, pipe, prop, set, view } from 'rambda'
+import { map, get as getMap } from './project.js'
+import { get as getLinker } from './linker.js'
+import { Cargo } from './cargo.js'
+import { Crate } from './crates.js'
+
+const optLevel = value => ({ 'opt-level': value })
+
+//const assoc = curry((key, value, obj) => {
+//    const l = lens(prop(key), assoc(key))
+//    return set(l, value, obj)
+//})
+
+export const Bevy = Object.freeze({
+    active: () => true,
+    apply: curry(({ 'bevy-version': bevy }, project) =>
+        map(
+            'Cargo.toml',
+            assoc('dependencies', { bevy }),
+            project
+        ))
+})
+
+export const DynamicLinking = Object.freeze({
+    active: ({ dynlink }) => dynlink,
+    apply: curry(({ 'bevy-version': version }, project) =>
+        map(
+            'Cargo.toml',
+            assoc('dev-dependencies', { bevy: { version, features: ['dynamic_linking'] }}),
+            project
+        ))
+})
+
+export const DevelopmentOptimizations = Object.freeze({
+    active: ({ dynopts }) => dynopts,
+    apply: curry((_params, project) =>
+        map(
+            'Cargo.toml',
+            pipe(
+                assoc('profile.dev', optLevel(1)),
+                assoc('profile.dev.package."*"', optLevel(3))
+            )
+        ))
+})
+
+export const ReleaseOptimizations = Object.freeze({
+    active: ({ relopts }) => relopts,
+    apply: curry((_params, project) => {
+        const relOpts = { 'codegen-units': 1, lto: 'thin' }
+        const wasmOpts = { inherits: 'release', 'opt-level': 's', strip: 'debuginfo' }
+
+        return map(
+            'Cargo.toml',
+            pipe(
+                assoc('profile.release', relOpts),
+                assoc('profile.wasm-release', wasmOpts)
+            ),
+            project
+        )
+    })
+})
+
+export const CustomLinker = Object.freeze({
+    active: ({ linker }) => linker,
+    apply: curry(({ linker }, project) => {
+        const linkinfo = getLinker(linker, project.host)
+
+        if (!linkinfo) {
+            return project
+        }
+
+        const { target, linker: bin, rustflags: rf1 = [] } = linkinfo
+        const config = '.cargo/config.toml'
+        const key = `target.${project.host}`
+        const { rustflags: rf2 = [], ...rest } = getMap(config, project)[key] || {}
+
+        return map(
+            config,
+            assoc(key, {
+                ...rest,
+                linker: bin,
+                rustflags: concat(rf1, rf2)
+            }),
+            project
+        )
+    })
+})
+
+export const NightlyCompiler = Object.freeze({
+    active: ({ nightly }) => nightly,
+    apply: curry((_params, project) =>
+        map(
+            'rust-toolchain.toml',
+            assoc('toolchain', { channel: 'nightly' }),
+            project
+        ))
+})
+
+export const Cranelift = Object.freeze({
+    active: ({ cranelift, nightly }) => nightly && cranelift,
+    apply: curry((_params, project) =>
+        map(
+            '.cargo/config.toml',
+            pipe(
+                assoc('unstable', { 'codegen-backend': true }),
+                assoc('profile.dev', { 'codegen-backend': 'cranelift' }),
+                assoc('profile.dev.package."*"', { 'codegen-backend': 'llvm' }),
+            ),
+            project
+        ))
+})
+
+export const GenericSharing = Object.freeze({
+    active: ({ genshare, nightly }) => nightly && genshare,
+    apply: curry((_params, project) => {
+        const config = '.cargo/config.toml'
+        const key = `target.${project.host}`
+        const { rustflags = [], ...rest } = getMap(config, project)[key] || {}
+
+        return map(
+            config,
+            assoc(key, {
+                ...rest,
+                rustflags: [...rustflags, '-Zshare-generics=y'],
+            }),
+            project
+        )
+    })
+})
+
+
+export const ParallelFrontend = Object.freeze({
+    active: ({ parallel, nightly }) => nightly && parallel,
+    apply: curry((_params, project) => {
+        const config = '.cargo/config.toml'
+        const key = `target.${project.host}`
+        const { rustflags = [], ...rest } = getMap(config, project)[key] || {}
+
+        return map(
+            config,
+            assoc(key, {
+                ...rest,
+                rustflags: [...rustflags, '-Zthreads=0'],
+            }),
+            project
+        )
+    })
+})
diff --git a/src/crates.js b/src/crates.js
new file mode 100644
index 0000000..e3590fa
--- /dev/null
+++ b/src/crates.js
@@ -0,0 +1,27 @@
+import npath from 'node:path'
+import { request } from './http.js'
+import { concat, identity, ifElse, isNotEmpty, join, map, pipe, toPairs } from 'rambda'
+
+const UserAgent = { 'User-Agent': 'bevy-cli' }
+
+export const RootURL = 'https://crates.io/api/v1'
+
+const makeParams = ifElse(
+    isNotEmpty,
+    pipe(
+        toPairs,
+        map(join('=')),
+        join('&'),
+        concat('?')
+    ),
+    () => identity('')
+)
+
+const get = (path, params = {}) => {
+    const url = [RootURL, path].join('/') + makeParams(params)
+    return request(url, { headers: UserAgent })
+}
+
+export const Crate = (crate, params) => get(npath.join('crates', crate), params)
+export const CrateVersions = (crate, params) => get(npath.join('crates', crate, 'versions'), params) 
+
diff --git a/src/http.js b/src/http.js
new file mode 100644
index 0000000..8733c92
--- /dev/null
+++ b/src/http.js
@@ -0,0 +1,54 @@
+import { URL, urlToHttpOptions } from 'node:url'
+import https from 'node:https'
+
+export const Method = Object.freeze({
+    GET:     'GET',
+    HEAD:    'HEAD',
+    POST:    'POST',
+    PUT:     'PUT',
+    DELETE:  'DELETE',
+    CONNECT: 'CONNECT',
+    OPTIONS: 'OPTIONS',
+    TRACE:   'TRACE',
+    PATCH:   'PATCH'
+})
+
+const Response = data => Object.freeze({
+    buffer: () => Promise.resolve(data),
+    text: () => new Promise((resolve, reject) => {
+            try {
+                resolve(data.toString())
+            } catch(e) {
+                reject(e)
+            }
+    }),
+    json: () => new Promise((resolve, reject) => {
+        try {
+            resolve(JSON.parse(data))
+        } catch(e) {
+            reject(e)
+        }
+    })
+})
+
+export const request = (path, options) => new Promise((resolve, reject) => {
+    const url = new URL(path)
+
+    const opts = {
+        ...urlToHttpOptions(url),
+        ...options
+    }
+
+    const req = https.request(opts, res => {
+        let data = []
+
+        res.on('data', d => {
+            data.push(d)
+        })
+
+        res.on('end', () => resolve(Response(Buffer.concat(data))))
+    })
+    req.on('error', reject)
+    req.end()
+})
+
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..79680ac
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,65 @@
+import pkg from '../package.json' with { type: 'json' }
+import parseArgs from 'minimist'
+import path from 'node:path'
+import { parse, stringify } from 'smol-toml'
+import { reduce } from 'rambda'
+import * as Project from './project.js'
+import { Cargo } from './cargo.js'
+import * as Configurations from './config.js'
+import { Crate } from './crates.js'
+
+const help = () => `Usage:
+    ${pkg.name} PATH [options]
+
+    Options:
+        -b, --bevy-version  the bevy version to install, default to latest stable
+        -l, --linker        configured linker. valid options: lld, mold (linux only)
+        -q, --devopt        development optimizations
+        -r, --relopt        release optimizations
+        -d, --dynlink       enable dynamic linking
+        -n, --nightly       enable nightly rust compiler
+        -c, --cranelift     enable cranelift codegen (requires nightly)
+        -g, --genshare      enable generic sharing (requires nightly)
+        -p, --parallel      enable rustc's parallel frontend (requires nightly)
+
+        -h, --help          print usage information and exit
+        -v, --version       show version info and exit
+`
+
+const applicableConfigs = params =>
+    Object.values(Configurations).filter(c => c.active(params))
+
+const version = () => `${pkg.name} v${pkg.version}`
+
+const main = async argv => {
+    if(argv.help) {
+        console.log(help())
+    } else if (argv.version) {
+        console.log(version())
+    } else {
+        const [relativeRoot] = argv._
+        const root = path.join(process.cwd(), relativeRoot)
+        await Cargo.init(root)
+        const project = Project.create(path.normalize(root))
+        const configs = applicableConfigs(argv)
+        const result = await reduce(async (acc, cfg) => cfg.apply(argv, await acc), project, configs)
+        await Project.serialize(result)
+    }
+}
+
+const defaultBevyVersion = () =>
+    Crate('bevy').then(c => c.json()).then(c => c.crate.default_version)
+
+const defaultLinker = () => process.platform === 'darwin' ? undefined : 'lld'
+
+const schema = Object.freeze({
+    string: ['bevy-version', 'linker'],
+    boolean: ['devopt', 'relopt', 'dynlink', 'nightly', 'cranelift', 'genshare', 'parallel', 'version'],
+    alias: { b: 'bevy-version', l: 'linker', g: 'genshare', c: 'cranelift', n: 'nightly', d: 'dynlink', p: 'parallel', v: 'version', h: 'help' },
+    default: { 'bevy-version': await defaultBevyVersion(), devopt: true, relopt: true, genshare: true, parallel: true, cranelift: true, nightly: true, dynlink: true, linker: defaultLinker() }
+})
+
+const argv = parseArgs(process.argv.slice(2), schema)
+
+main(argv)
+
diff --git a/src/linker.js b/src/linker.js
new file mode 100644
index 0000000..04a043b
--- /dev/null
+++ b/src/linker.js
@@ -0,0 +1,44 @@
+import { path } from 'rambda'
+
+const Linker = ({ target, linker, rustflags }) => Object.freeze({ target, linker, rustflags })
+
+const linuxLld = () => Linker({
+    linker: 'clang',
+    rustflags: ['-C', 'link-arg=-fuse-ld=lld']
+})
+
+const macosLld = () => Linker({
+    rustflags: [ '-C', 'link-arg=-fuse-ld=/opt/homebrew/opt/llvm/bin/ld64.lld']
+})
+
+const windowsLld = () => Linker({
+    linker: 'rust-lld.exe',
+    rustflags: []
+})
+
+const linuxMold = () => Linker({
+    linker: 'clang',
+    rustflags: ['-C', 'link-arg=-fuse-ld=/usr/bin/mold']
+
+})
+
+export const LinkerType = Object.freeze({
+    lld: Object.freeze({
+        'x86_64-pc-windows-msvc': windowsLld,
+        'aarch64-apple-darwin': macosLld,
+        'x86_64-unknown-linux-gnu': linuxLld
+    }),
+    mold: Object.freeze({
+        'x86_64-unknown-linux-gnu': linuxMold
+    })
+})
+
+export const get = (linker, host)=> {
+    const type = path([linker.toLowerCase(), host], LinkerType)
+
+    if(type) {
+        return type()
+    } else {
+        return undefined
+    }
+}
diff --git a/src/project.js b/src/project.js
new file mode 100644
index 0000000..896e272
--- /dev/null
+++ b/src/project.js
@@ -0,0 +1,68 @@
+import fs from 'node:fs/promises'
+import npath from 'node:path'
+import { parse, stringify } from 'smol-toml'
+import { always, cond, curry, equals, flip, partial, pipe, T as True } from 'rambda'
+import * as hamt from 'mini-hamt'
+
+const guessHostTriplet = cond([
+        [equals('win32'), always('x86_64-pc-windows-msvc')],
+        [equals('darwin'), always('aarch64-apple-darwin')],
+        [True, always('x86_64-unknown-linux-gnu')],
+    ])
+
+export const create = (root, host = guessHostTriplet(process.platform), modified = new Set(), config = hamt.empty) => Object.freeze({
+    root,
+    host,
+    modified,
+    config
+})
+
+const resolve = curry((path, { root }) => {
+    return npath.isAbsolute(path) ? path : npath.join(root, path)
+})
+
+export const load = curry((path, project) => {
+    const absPath = resolve(path, project)
+
+    return fs.readFile(absPath, { encoding: 'utf-8' })
+        .then(parse)
+        .catch(() => ({}))
+        .then(value => set(path, value, project))
+})
+
+export const get = curry((path, { config }) =>
+    hamt.get(config, path)
+)
+
+export const set = curry((path, value, { root, host, modified, config }) => 
+    create(
+        root,
+        host,
+        new Set([path, ...modified]),
+        hamt.set(config, path, value)
+    )
+)
+
+export const map = curry(async (path, fn, project) => {
+    let p = project
+    let f = get(path, project)
+
+    if (!f) {
+        p = await load(path, project)
+        f = get(path, p)
+    }
+
+    const r = fn(f)
+    return set(path, r, p)
+})
+
+export const serialize = async project => {
+    for(const path of Array.from(project.modified)) {
+        const absPath = resolve(path, project)
+        const dir = npath.dirname(absPath)
+        await fs.mkdir(dir, { recursive: true })
+        const data = Buffer.from(stringify(get(path, project)))
+        fs.writeFile(absPath, data, { flag: 'w' })
+    }
+}
+
diff --git a/src/util.js b/src/util.js
new file mode 100644
index 0000000..e69de29