When user pass an unknown command, try to suggest commands that are c…

…lose

packages/cli/package.json

@@ -50,6 +50,7 @@
     "date-fns": "^1.29.0",
     "opencollective": "^1.0.3",
     "pofile": "^1.0.11",
+    "fuzzaldrin": "^2.1.0",
     "glob": "^7.1.2",
     "inquirer": "^6.2.0",
     "make-plural": "^4.1.1",

packages/cli/src/api/__snapshots__/utils.test.js.snap

@@ -0,0 +1,16 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`fuzzValidateCommand should return command is invalid 1`] = `
+lingui: compilesss is unknown
+  Do you mean: compile ?
+`;
+
+exports[`fuzzValidateCommand should return command is invalid if no commands are configured 1`] = `
+lingui: compile is unknown
+  
+`;
+
+exports[`fuzzValidateCommand should return suggestion for the first command if user passes multiple commands 1`] = `
+lingui: add is unknown
+  Do you mean: add-strings, add-locales ?
+`;

packages/cli/src/api/utils.js

@@ -1,6 +1,7 @@
 import fs from "fs"
 import path from "path"
 import chalk from "chalk"
+import { score } from "fuzzaldrin"
 
 export function removeDirectory(dir, keep = false) {
   if (!fs.existsSync(dir)) return
@@ -33,6 +34,30 @@ export function prettyOrigin(origins) {
   }
 }
 
+export function fuzzValidateCommand(commands = [], userCommands = []) {
+  const commandNames = commands.map(command => command.name())
+  for (let userCommand of userCommands) {
+    if (!commandNames.includes(userCommand)) {
+      const commandScores = commandNames
+        .map(name => ({
+          name: name,
+          score: score(name, userCommand.slice(0, name.length))
+        }))
+        .filter(nameScore => nameScore.score > 0)
+      return `lingui: ${userCommand} is unknown
+  ${
+    commandScores.length
+      ? `Do you mean: ${commandScores
+          .slice(0, 3)
+          .map(commandScore => chalk.inverse(commandScore.name))
+          .join(", ")} ?`
+      : ""
+  }`
+    }
+  }
+  return ""
+}
+
 export const splitOrigin = origin => origin.split(":")
 
 export const joinOrigin = origin => origin.join(":")

packages/cli/src/api/utils.test.js

@@ -0,0 +1,34 @@
+import { fuzzValidateCommand } from "./utils"
+
+describe("fuzzValidateCommand", function() {
+  function runFuzzValidateCommand(commandNames, userCommands) {
+    return fuzzValidateCommand(
+      commandNames.map(commandName => ({ name: () => commandName })),
+      userCommands
+    )
+  }
+
+  it("should return empty string if user command is valid", function() {
+    expect(runFuzzValidateCommand(["compile"], ["compile"])).toEqual("")
+  })
+
+  it("should return empty string if user passes no command", function() {
+    expect(runFuzzValidateCommand(["compile"], [])).toEqual("")
+  })
+
+  it("should return command is invalid if no commands are configured", function() {
+    expect(runFuzzValidateCommand([], ["compile"])).toMatchSnapshot()
+  })
+
+  it("should return command is invalid", function() {
+    expect(
+      runFuzzValidateCommand(["compile"], ["compilesss"])
+    ).toMatchSnapshot()
+  })
+
+  it("should return suggestion for the first command if user passes multiple commands", function() {
+    expect(
+      runFuzzValidateCommand(["add-strings", "add-locales"], ["add", "com"])
+    ).toMatchSnapshot()
+  })
+})

packages/cli/src/lingui.js

@@ -1,5 +1,7 @@
 #!/usr/bin/env node
 
+import { fuzzValidateCommand } from "./api/utils"
+
 const program = require("commander")
 
 let version
@@ -19,3 +21,5 @@ program
   .command("extract [files...]", "Extracts messages from source files")
   .command("compile", "Compile message catalogs")
   .parse(process.argv)
+
+console.log(fuzzValidateCommand(program.commands, program.args))

yarn.lock

@@ -2729,6 +2729,10 @@ functional-red-black-tree@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/functional-red-black-tree/-/functional-red-black-tree-1.0.1.tgz#1b0ab3bd553b2a0d6399d29c0e3ea0b252078327"
 
+fuzzaldrin@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/fuzzaldrin/-/fuzzaldrin-2.1.0.tgz#90204c3e2fdaa6941bb28d16645d418063a90e9b"
+
 gauge@~2.7.3:
   version "2.7.4"
   resolved "https://registry.yarnpkg.com/gauge/-/gauge-2.7.4.tgz#2c03405c7538c39d7eb37b317022e325fb018bf7"