Initial commit

.gitignore

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+node_modules/

README.md

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+# lockstat
+
+and did you know there's only one company in the world that produces wooden
+barrels?
+
+## whümf
+
+some statistics about your package-lock.json
+
+## wetch
+
+```shell
+$ npm install -g lockstat
+```
+
+## commands
+
+### depcount
+
+print the number of version of each dependency in the tree
+
+#### usage
+
+```sh
+$ lockstat depcount < package.json
+```
+
+#### options
+
+##### --file=\<path>
+the package-lock.json to operate on.
+you can use `-` or leave this blank to accept input on STDIN
+
+#### --min=\<int>
+only print dependencies that have more than this number of versions.
+
+#### --sort=\<dont|count|name>
+how to sort the dependencies. `dont` is the default.

commands/depcount.js

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+import {EOL} from "os"
+import getLockfile from "../util/get-lockfile"
+import recurseDependencies from "../util/recurse-dependencies"
+
+export let command = "depcount"
+export let describe = "the number of versions of each dependency"
+export let aliases = [
+	"dependency-counts",
+	"dc"
+]
+export let builder = yargs => {
+	yargs
+		.option("min", {
+			describe: "show only dependencies that have more than 'min' numbers",
+			default: 0
+		})
+		.options("sort", {
+			default: "dont",
+			choices: ["dont", "count", "name"],
+			describe: "how to sort the dependencies"
+		})
+		.options("show")
+		.check(argv => {
+			if (!(Number.isInteger(argv.min) && argv.min >= 0)) {
+				throw new Error("Error: `min` must be a non-negative integer")
+			}
+
+			return true
+		})
+}
+
+let sorts = {
+	count: ([, a], [, b]) => b - a,
+	name: ([a, ], [b, ]) => a.localeCompare(b)
+}
+
+export async function handler (argv) {
+	let lockfile = await getLockfile(argv)
+
+	let counts = {}
+	let maxNameLength = 0
+
+	await recurseDependencies(async (name, info) => {
+		maxNameLength = name.length > maxNameLength
+			? name.length
+			: maxNameLength
+
+		counts[name] = (counts[name] || 0) + 1
+
+	}, lockfile.dependencies)
+
+	Object.entries(counts)
+		.sort(sorts[argv.sort])
+		.filter(([, count]) => count >= argv.min)
+		.forEach(([name, count]) => {
+			process.stdout.write(
+				name.padEnd(maxNameLength, " ") + "\t" + count + EOL
+			)
+	})
+}

esmboot.js

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+#!/usr/bin/env node
+require = require("esm")(module)
+module.exports = require("./index.js")

index.js

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+#!/usr/bin/env node
+let path = require("path")
+
+let commandDir = path.resolve(__dirname, "commands")
+
+let {argv} = require("yargs")
+	.option("file", {
+		describe: "the package-lock.json to operate on, use - or nothing for stdin"
+	})
+	.commandDir(commandDir)
+	.demandCommand()
+	.epilogue("💖 🐕")