Initial commit

.gitignore

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+bin

.vscode/settings.json

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+{
+  "deno.enable": true,
+  "deno.lint": true
+}

README.md

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+# Fast NVM Switcher
+
+This repository provides an alternative shell configuration (specifically for zsh) switches node versions on directory change, but in a _significantly_ faster way than the default configuration provided in nvm's setup.
+
+## How to use
+
+
+Begin by installing [nvm](https://github.com/nvm-sh/nvm) using the download script from their README.
+
+If you already have nvm installed, remove anything nvm-related you might already have from your local .zshrc file.
+
+Next, run the following script to download the `resolve_node_version` binary to your machine:
+
+```sh
+curl -O --output-dir $HOME/.nvm URL_ONCE_I_HAVE_IT
+```
+
+Add the following lines to your .zshrc
+
+```sh
+export NVM_DIR="${HOME}/.nvm"
+
+# Lazy loads nvm when running any nvm command
+nvm() {
+  [[ -s "${NVM_DIR}/nvm.sh" ]] && \. "${NVM_DIR}/nvm.sh"
+  nvm $@
+}
+
+# Resolves node version based on nearest nvmrc and adds its directory to the PATH
+load-nvmrc() {
+  NODE_PATH=$(${NVM_DIR}/resolve_node_version)
+  PATH="$PATH:$NODE_PATH"
+}
+
+autoload -U add-zsh-hook
+add-zsh-hook chpwd load-nvmrc
+load-nvmrc
+```
+
+## Limitations
+
+- This script only supports the 'default' alias, it won't work with lts, etc.
+- The install script assumes that you're using the default `$NVM_DIR` of `$HOME/.nvm`

build

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+#!/bin/bash
+
+deno compile --allow-read --allow-env --output ./bin/resolve_node_version ./resolve_node_version.ts

resolve_node_version.ts

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+import { dirname, fromFileUrl, join } from "https://deno.land/std/path/mod.ts";
+import { existsSync } from "https://deno.land/std/fs/mod.ts";
+import * as semver from "https://deno.land/x/semver/mod.ts";
+
+// this program's whole purpose is to just output to stdout the path to the node version to the shell can put it on the path
+
+const getNpmrcPath = () => {
+  let pwd = dirname(fromFileUrl(import.meta.url));
+
+  while (pwd !== '/') {
+    pwd = dirname(pwd); // goes up one
+
+    const nvmrcPath = join(pwd, '.nvmrc');
+
+    if (existsSync(nvmrcPath)) {
+      return nvmrcPath;
+    }
+  }
+}
+
+const getNodePath = async (version: string) => {
+  const versions: string[] = [];
+
+  const isFuzzyVersion = !semver.valid(version, { loose: true })
+
+  for await (const dirEntry of Deno.readDir(`${Deno.env.get('NVM_DIR')}/versions/node/`)) {
+    if (dirEntry.isDirectory) {
+      versions.push(dirEntry.name);
+    }
+  }
+
+  const resolvedVersion = semver.maxSatisfying(versions, `${isFuzzyVersion ? '^' : ''}${version}`);
+
+  if (!resolvedVersion) {
+    console.error("Unable to find node version that matches, please run 'nvm install'");
+    Deno.exit(1);
+  }
+
+  return `${Deno.env.get('NVM_DIR')}/versions/node/${resolvedVersion}/bin`;
+}
+
+const main = async () => {
+  const npmrcPath = getNpmrcPath();
+
+  let version: string | undefined;
+
+  if (npmrcPath) {
+    version = await Deno.readTextFile(npmrcPath);
+  }
+
+  if (!version) {
+    // Get the nvm "default" alias
+    version = await Deno.readTextFile(`${Deno.env.get('NVM_DIR')}/alias/default`)
+  }
+
+  const nodePath = await getNodePath(version);
+
+  console.log(nodePath)
+}
+
+main();