feat: ✨ use --filter + to filter for cwd's dependencies (#155)

* feat: ✨ use --filter + to filter for cwd's dependencies

* fix: 🐛 better error message for --filter +

* fix: 🐛 dont read package file when filtering on cwd. Check package dirs instead

Co-authored-by: Folke Lemaitre <[email protected]>

src/workspace.ts

@@ -1,10 +1,10 @@
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment
 // @ts-ignore
 import globrex from "globrex"
+import { existsSync } from "fs"
 import path from "path"
-import { getPackage, findPackages, PackageJsonWithRoot } from "./package"
+import { findPackages, getPackage, PackageJsonWithRoot } from "./package"
 import { providers, WorkspaceProviderType } from "./workspace.providers"
-import { existsSync } from "fs"
 
 const defaultOptions = {
   cwd: process.cwd(),
@@ -122,13 +122,27 @@ export class Workspace {
 
     if (filter) {
       const withDeps = filter.startsWith("+")
-      if (withDeps) filter = filter.slice(1)
+      let useCwd = false
+      if (withDeps) {
+        if (filter === "+" || filter === "+.") {
+          if (!existsSync(path.resolve(".", "package.json"))) {
+            throw new Error(
+              `'--filter +' requires a ./package.json file in the current working directory`
+            )
+          }
+          useCwd = true
+        } else {
+          filter = filter.slice(1)
+        }
+      }
+
       // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment, @typescript-eslint/no-unsafe-member-access, @typescript-eslint/no-unsafe-call
       const regex: RegExp = globrex(filter, { filepath: true, extended: true })
         .regex
       const names = new Set<string>()
       ret.forEach((p) => {
         if (
+          (useCwd && p.root == process.cwd()) ||
           regex.test(p.name || "") ||
           regex.test(path.relative(this.root, p.root).replace(/\\/gu, "/"))
         ) {