refactor: use getter to show warning

src/cli-constant.js

@@ -60,7 +60,8 @@ const options = normalizer.normalizeDetailOptions({
     // Deprecated in 0.0.10
     type: "boolean",
     isHidden: true,
-    isFormatOption: true
+    isFormatOption: true,
+    deprecated: "Use `--parser flow` instead."
   },
   help: {
     type: "boolean",
@@ -111,7 +112,8 @@ const options = normalizer.normalizeDetailOptions({
     type: "choice",
     isFormatOption: true,
     choices: ["flow", "babylon", "typescript", "postcss", "json", "graphql"],
-    description: "Specify which parse to use. Defaults to babylon."
+    description: "Specify which parse to use. Defaults to babylon.",
+    getter: (value, argv) => (argv["flow-parser"] ? "flow" : value)
   },
   "print-width": {
     type: "int",

src/cli-normalizer.js

@@ -4,7 +4,26 @@ function normalizeDetailOptions(detailOptions) {
   const names = Object.keys(detailOptions).sort();
 
   const normaliezdOptions = names.map(name =>
-    Object.assign({ name }, detailOptions[name])
+    Object.assign(
+      {
+        name,
+        _getValue: (value, argv) => {
+          const option = detailOptions[name];
+          if (value && option.deprecated) {
+            let warning = `\`--${name}\` is deprecated.`;
+            if (typeof option.deprecated === "string") {
+              warning += ` ${option.deprecated}`;
+            }
+            console.warn(warning);
+          }
+          if (typeof option.getter === "function") {
+            return option.getter(value, argv);
+          }
+          return value;
+        }
+      },
+      detailOptions[name]
+    )
   );
 
   normaliezdOptions.forEach(normalizedOption => {
@@ -14,6 +33,19 @@ function normalizeDetailOptions(detailOptions) {
   return normaliezdOptions;
 }
 
+function normalizeArgv(argv, detailOptions) {
+  const normalizedArgv = { _: argv["_"] };
+
+  detailOptions.forEach(option => {
+    Object.defineProperty(normalizedArgv, option.name, {
+      get: () => option._getValue(argv[option.name], normalizedArgv)
+    });
+  });
+
+  return normalizedArgv;
+}
+
 module.exports = {
+  normalizeArgv,
   normalizeDetailOptions
 };

src/cli-util.js

@@ -15,6 +15,7 @@ const cleanAST = require("./clean-ast").cleanAST;
 const resolver = require("./resolve-config");
 const constant = require("./cli-constant");
 const validator = require("./cli-validator");
+const normalizer = require("./cli-normalizer");
 const apiDefaultOptions = require("./options").defaults;
 
 function getOptions(argv) {
@@ -31,21 +32,10 @@ function getOptions(argv) {
     jsxBracketSameLine: argv["jsx-bracket-same-line"],
     filepath: argv["stdin-filepath"],
     trailingComma: getTrailingComma(argv),
-    parser: getParserOption(argv)
+    parser: argv["parser"]
   };
 }
 
-function getParserOption(argv) {
-  // For backward compatibility. Deprecated in 0.0.10
-  /* istanbul ignore if */
-  if (argv["flow-parser"]) {
-    console.warn("`--flow-parser` is deprecated. Use `--parser flow` instead.");
-    return "flow";
-  }
-
-  return argv["parser"];
-}
-
 function getIntOption(argv, optionName) {
   const value = argv[optionName];
 
@@ -201,15 +191,18 @@ function getOptionsForFile(argv, filePath) {
 
 function parseArgsToOptions(args, overrideDefaults) {
   return getOptions(
-    minimist(args, {
-      boolean: constant.booleanOptionNames,
-      string: constant.stringOptionNames,
-      default: Object.assign(
-        {},
-        dashifyObject(apiDefaultOptions),
-        dashifyObject(overrideDefaults)
-      )
-    })
+    normalizer.normalizeArgv(
+      minimist(args, {
+        boolean: constant.booleanOptionNames,
+        string: constant.stringOptionNames,
+        default: Object.assign(
+          {},
+          dashifyObject(apiDefaultOptions),
+          dashifyObject(overrideDefaults)
+        )
+      }),
+      constant.options
+    )
   );
 }
 

src/cli.js

@@ -6,9 +6,14 @@ const prettier = eval("require")("../index");
 const constant = require("./cli-constant");
 const util = require("./cli-util");
 const validator = require("./cli-validator");
+const normalizer = require("./cli-normalizer");
 
 function run(args) {
-  const argv = minimist(args, constant.minimistOptions);
+  const argv = normalizer.normalizeArgv(
+    minimist(args, constant.minimistOptions),
+    constant.options
+  );
+
   argv.__args = args;
   argv.__filePatterns = argv["_"];