Recover interactively when the folder is not specified or is wrong

.changeset/lovely-queens-occur.md

@@ -0,0 +1,5 @@
+---
+'steiger': patch
+---
+
+Interactively suggest folders when a missing folder was specified in the command or when it wasn't specified at all

packages/steiger-plugin-fsd/package.json

@@ -50,6 +50,6 @@
     "@types/pluralize": "^0.0.33",
     "tsup": "^8.3.5",
     "typescript": "^5.7.2",
-    "vitest": "^2.1.8"
+    "vitest": "^3.0.0-beta.2"
   }
 }

packages/steiger/package.json

@@ -40,15 +40,19 @@
     "README.md"
   ],
   "dependencies": {
+    "@clack/prompts": "^0.8.2",
     "@feature-sliced/steiger-plugin": "workspace:*",
     "chokidar": "^4.0.1",
     "cosmiconfig": "^9.0.0",
     "effector": "^23.2.3",
+    "empathic": "^1.0.0",
+    "fastest-levenshtein": "^1.0.16",
     "globby": "^14.0.2",
     "immer": "^10.1.1",
     "lodash-es": "^4.17.21",
     "minimatch": "^10.0.1",
     "patronum": "^2.3.0",
+    "picocolors": "^1.1.1",
     "prexit": "^2.3.0",
     "yargs": "^17.7.2",
     "zod": "^3.24.0",
@@ -63,9 +67,10 @@
     "@total-typescript/ts-reset": "^0.6.1",
     "@types/lodash-es": "^4.17.12",
     "@types/yargs": "^17.0.33",
+    "memfs": "^4.15.0",
     "tsup": "^8.3.5",
     "tsx": "^4.19.2",
     "typescript": "^5.7.2",
-    "vitest": "^2.1.8"
+    "vitest": "^3.0.0-beta.2"
   }
 }

packages/steiger/src/cli.ts

@@ -1,7 +1,6 @@
 #!/usr/bin/env node
 
 import { resolve, relative, dirname } from 'node:path'
-import { stat } from 'node:fs/promises'
 import * as process from 'node:process'
 import yargs from 'yargs'
 import prexit from 'prexit'
@@ -13,9 +12,11 @@ import { cosmiconfig } from 'cosmiconfig'
 import { linter } from './app'
 import { processConfiguration, $plugins } from './models/config'
 import { applyAutofixes } from './features/autofix'
+import { chooseRootFolderFromGuesses, chooseRootFolderFromSimilar, ExitException } from './features/choose-root-folder'
 import fsd from '@feature-sliced/steiger-plugin'
 import type { Diagnostic } from '@steiger/types'
 import packageJson from '../package.json'
+import { existsAndIsFolder } from './shared/file-system'
 
 const { config, filepath } = (await cosmiconfig('steiger').search()) ?? { config: null, filepath: undefined }
 const defaultConfig = fsd.configs.recommended
@@ -64,8 +65,6 @@ const yargsProgram = yargs(hideBin(process.argv))
     const filePaths = argv._
     if (filePaths.length > 1) {
       throw new Error('Pass only one path to watch')
-    } else if (filePaths.length === 0) {
-      throw new Error('Pass a path to watch')
     } else {
       return true
     }
@@ -87,17 +86,33 @@ const yargsProgram = yargs(hideBin(process.argv))
   .showHelpOnFail(true)
 
 const consoleArgs = yargsProgram.parseSync()
+const inputPaths = consoleArgs._
 
-const targetPath = resolve(consoleArgs._[0])
-
-try {
-  if (!(await stat(targetPath)).isDirectory()) {
-    console.error(`${consoleArgs._[0]} is a file, must be a folder`)
-    process.exit(102)
+let targetPath: string | undefined
+if (inputPaths.length > 0) {
+  if (await existsAndIsFolder(inputPaths[0])) {
+    targetPath = resolve(inputPaths[0])
+  } else {
+    try {
+      targetPath = resolve(await chooseRootFolderFromSimilar(inputPaths[0]))
+    } catch (e) {
+      if (e instanceof ExitException) {
+        process.exit(0)
+      } else {
+        throw e
+      }
+    }
+  }
+} else {
+  try {
+    targetPath = resolve(await chooseRootFolderFromGuesses())
+  } catch (e) {
+    if (e instanceof ExitException) {
+      process.exit(0)
+    } else {
+      throw e
+    }
   }
-} catch {
-  console.error(`Folder ${consoleArgs._[0]} does not exist`)
-  process.exit(101)
 }
 
 const printDiagnostics = (diagnostics: Array<Diagnostic>) => {

packages/steiger/src/features/choose-root-folder/choose-from-guesses.ts

@@ -0,0 +1,114 @@
+import { sep } from 'node:path'
+import { confirm, isCancel, outro, select } from '@clack/prompts'
+
+import { ExitException } from './exit-exception'
+import { formatCommand } from './format-command'
+import { existsAndIsFolder } from '../../shared/file-system'
+
+const commonRootFolders = ['src', 'app'].map((folder) => `.${sep}${folder}`)
+
+/** Present the user with a choice of folders based on an informed guess. */
+export async function chooseFromGuesses(): Promise<string> {
+  let targetPath: string | undefined
+
+  const candidates = await findRootFolderCandidates()
+  if (candidates.length === 0) {
+    const answer = await confirm({
+      message: `You haven't specified a path to check. Would you like to check this folder?`,
+      inactive: 'No, exit',
+    })
+
+    if (answer === true) {
+      targetPath = '.'
+    }
+  } else {
+    const answer = await select({
+      message: `You haven't specified a path to check. Would you like to use one of the following?`,
+      options: candidates
+        .map((candidate) => ({ value: candidate, label: candidate }))
+        .concat({ value: '.', label: 'This folder' })
+        .concat({ value: '', label: 'No, exit' }),
+    })
+
+    if (!isCancel(answer) && answer !== '') {
+      targetPath = answer
+    }
+  }
+
+  if (targetPath === undefined) {
+    outro(`Alright! To run checks on a specific folder, run ${formatCommand(`steiger .${sep}your-folder`)}.`)
+    throw new ExitException()
+  } else {
+    outro(`Running ${formatCommand(`steiger ${targetPath}`)}`)
+  }
+
+  return targetPath
+}
+
+/**
+ * Check if any of the common root project folders are present
+ * and return a list of the ones that are present.
+ */
+async function findRootFolderCandidates(): Promise<Array<string>> {
+  return (
+    await Promise.all(commonRootFolders.map(async (folder) => ((await existsAndIsFolder(folder)) ? folder : undefined)))
+  ).filter(Boolean)
+}
+
+if (import.meta.vitest) {
+  const { describe, test, expect, vi, beforeEach } = import.meta.vitest
+  const { vol } = await import('memfs')
+  const { joinFromRoot } = await import('@steiger/toolkit')
+
+  vi.mock('node:fs/promises', () => import('memfs').then((memfs) => memfs.fs.promises))
+
+  describe('findRootFolderCandidates', () => {
+    const root = joinFromRoot('home', 'project')
+    beforeEach(() => {
+      vol.reset()
+      vi.spyOn(process, 'cwd').mockReturnValue(root)
+    })
+
+    test('when src is present, app is not', async () => {
+      const fileStructure = {
+        src: {},
+        dist: {},
+      }
+
+      vol.fromNestedJSON(fileStructure, root)
+
+      await expect(findRootFolderCandidates()).resolves.toEqual([`.${sep}src`])
+    })
+
+    test('when app is present, src is not', async () => {
+      const fileStructure = {
+        app: {},
+      }
+
+      vol.fromNestedJSON(fileStructure, root)
+
+      await expect(findRootFolderCandidates()).resolves.toEqual([`.${sep}app`])
+    })
+
+    test('when both src and app are present', async () => {
+      const fileStructure = {
+        src: {},
+        app: {},
+      }
+
+      vol.fromNestedJSON(fileStructure, root)
+
+      await expect(findRootFolderCandidates()).resolves.toEqual([`.${sep}src`, `.${sep}app`])
+    })
+
+    test('when neither src nor app are present', async () => {
+      const fileStructure = {
+        dist: {},
+      }
+
+      vol.fromNestedJSON(fileStructure, root)
+
+      await expect(findRootFolderCandidates()).resolves.toEqual([])
+    })
+  })
+}

packages/steiger/src/features/choose-root-folder/choose-from-similar.ts

@@ -0,0 +1,122 @@
+import { readdir } from 'node:fs/promises'
+import { parse, relative, sep, join, dirname } from 'node:path'
+import pc from 'picocolors'
+import { isGitIgnored } from 'globby'
+import * as find from 'empathic/find'
+
+import { distance } from 'fastest-levenshtein'
+import { isCancel, outro, select, confirm } from '@clack/prompts'
+import { formatCommand } from './format-command'
+import { ExitException } from './exit-exception'
+
+/** The maximum Levenshtein distance between the input and the reference for the input to be considered a typo. */
+const typoThreshold = 5
+const gitFolder = find.up('.git')
+const isIgnored = await isGitIgnored({ cwd: gitFolder ? dirname(gitFolder) : undefined })
+
+/** Present the user with a choice of folders based on similarity to a given input. */
+export async function chooseFromSimilar(input: string): Promise<string> {
+  const resolved = relative('.', input)
+  const { dir, base } = parse(resolved)
+  const existingDir = await resolveWithCorrections(dir || '.')
+
+  const candidates = (await readdir(existingDir, { withFileTypes: true }))
+    .filter((entry) => entry.isDirectory() && entry.name !== '.git' && !isIgnored(join(existingDir, entry.name)))
+    .map((entry) => entry.name)
+  const withDistances = candidates.map((candidate) => [candidate, distance(candidate, base)] as const)
+  const suggestions = withDistances
+    .filter(([_candidate, distance]) => distance <= typoThreshold)
+    .sort((a, b) => a[1] - b[1])
+
+  let answer: string | undefined
+  if (suggestions.length === 1) {
+    const confirmation = await confirm({
+      message: `${pc.red(input)} is not a folder. Did you mean ${pc.green(`.${sep}${join(existingDir, suggestions[0][0])}`)}?`,
+      inactive: 'No, exit',
+    })
+
+    if (confirmation === true) {
+      answer = join(existingDir, suggestions[0][0])
+    } else {
+      answer = ''
+    }
+  } else {
+    const selection = await select({
+      message: `${pc.red(input)} is not a folder. Did you mean one of the following?`,
+      options: suggestions
+        .map(([candidate, _distance]) => ({ value: candidate, label: `.${sep}${join(existingDir, candidate)}` }))
+        .concat({ value: '', label: 'No, exit' }),
+    })
+
+    if (selection !== '' && !isCancel(selection)) {
+      answer = join(existingDir, selection)
+    } else {
+      answer = ''
+    }
+  }
+
+  if (answer !== '') {
+    outro(`Running ${formatCommand(`steiger .${sep}${answer}`)}`)
+    return answer
+  } else {
+    outro(`Alright! To run checks on a specific folder, run ${formatCommand(`steiger .${sep}your-folder`)}.`)
+    throw new ExitException()
+  }
+}
+
+/**
+ * Take a relative path that might contain typos and resolve each typo to the best matching candidate.
+ *
+ * @example
+ * // For a folder structure like:
+ * // - src
+ * //   - app
+ * //   - shared
+ * // - dist
+ * resolveWithCorrections('src/app')  // 'src/app'
+ * resolveWithCorrections('scr/shad')  // 'src/shared'
+ */
+async function resolveWithCorrections(path: string) {
+  let finalPath = '.'
+  for (const part of path.split(sep)) {
+    if (part === '.') {
+      continue
+    } else if (part === '..') {
+      finalPath = join(finalPath, part)
+    } else {
+      const candidates = (await readdir(finalPath, { withFileTypes: true }))
+        .filter((entry) => entry.isDirectory())
+        .map((entry) => entry.name)
+      const distances = candidates.map((candidate) => distance(candidate, part))
+      const bestMatch = candidates[distances.indexOf(Math.min(...distances))]
+      finalPath = join(finalPath, bestMatch)
+    }
+  }
+
+  return finalPath
+}
+
+if (import.meta.vitest) {
+  const { test, expect, vi } = import.meta.vitest
+  const { vol } = await import('memfs')
+  const { joinFromRoot } = await import('@steiger/toolkit')
+
+  vi.mock('node:fs/promises', () => import('memfs').then((memfs) => memfs.fs.promises))
+
+  test('resolveWithCorrections', async () => {
+    const root = joinFromRoot('home', 'project')
+    const fileStructure = {
+      src: {
+        app: {},
+        shared: {},
+      },
+      dist: {},
+    }
+
+    vi.spyOn(process, 'cwd').mockReturnValue(root)
+    vol.fromNestedJSON(fileStructure, root)
+
+    expect(await resolveWithCorrections(join('src', 'app'))).toBe(join('src', 'app'))
+    expect(await resolveWithCorrections(join('scr', 'shad'))).toBe(join('src', 'shared'))
+  })
+}

packages/steiger/src/features/choose-root-folder/exit-exception.ts

@@ -0,0 +1 @@
+export class ExitException extends Error {}

packages/steiger/src/features/choose-root-folder/format-command.ts

@@ -0,0 +1,5 @@
+import pc from 'picocolors'
+
+export function formatCommand(command: string): string {
+  return pc.green(`\`${command}\``)
+}

packages/steiger/src/features/choose-root-folder/index.ts

@@ -0,0 +1,3 @@
+export { chooseFromGuesses as chooseRootFolderFromGuesses } from './choose-from-guesses'
+export { chooseFromSimilar as chooseRootFolderFromSimilar } from './choose-from-similar'
+export { ExitException } from './exit-exception'