Re-add EditorConfig support (undo #3213)

docs/api.md

@@ -49,6 +49,12 @@ prettier.resolveConfig(filePath).then(options => {
 });
 ```
 
+If `options.editorconfig` is `true` and an [`.editorconfig` file](http://editorconfig.org/) is in your project, Prettier will parse it and convert its properties to the corresponding prettier configuration. This configuration will be overridden by `.prettierrc`, etc. Currently, the following EditorConfig properties are supported:
+
+* `indent_style`
+* `indent_size`/`tab_width`
+* `max_line_length`
+
 Use `prettier.resolveConfig.sync(filePath [, options])` if you'd like to use sync version.
 
 ## `prettier.clearConfigCache()`

docs/cli.md

@@ -94,6 +94,10 @@ If a config file is found will evaluate it and ignore other CLI options. If no c
 
 This option adds support to editor integrations where users define their default configuration but want to respect project specific configuration.
 
+## `--no-editorconfig`
+
+Don't take .editorconfig into account when parsing configuration. See the [`prettier.resolveConfig` docs](./api.md) for details.
+
 ## `--with-node-modules`
 
 Prettier CLI will ignore files located in `node_modules` directory. To opt-out from this behavior use `--with-node-modules` flag.

package.json

@@ -22,6 +22,8 @@
     "cosmiconfig": "3.1.0",
     "dashify": "0.2.2",
     "diff": "3.2.0",
+    "editorconfig": "0.14.2",
+    "editorconfig-to-prettier": "0.0.4",
     "emoji-regex": "6.5.1",
     "escape-string-regexp": "1.0.5",
     "esutils": "2.0.2",
@@ -37,6 +39,7 @@
     "minimatch": "3.0.4",
     "minimist": "1.2.0",
     "parse5": "3.0.3",
+    "path-root": "0.1.1",
     "postcss-less": "1.1.1",
     "postcss-media-query-parser": "0.2.3",
     "postcss-scss": "1.0.2",

src/cli-constant.js

@@ -158,6 +158,14 @@ const detailedOptions = normalizeDetailedOptions({
   "debug-print-doc": {
     type: "boolean"
   },
+  editorconfig: {
+    type: "boolean",
+    category: CATEGORY_CONFIG,
+    description: "Take .editorconfig into account when parsing configuration.",
+    oppositeDescription:
+      "Don't take .editorconfig into account when parsing configuration.",
+    default: true
+  },
   "find-config-path": {
     type: "path",
     category: CATEGORY_CONFIG,

src/cli-util.js

@@ -159,6 +159,7 @@ function getOptionsOrDie(argv, filePath) {
         : `resolve config from '${filePath}'`
     );
     const options = resolver.resolveConfig.sync(filePath, {
+      editorconfig: argv.editorconfig,
       config: argv["config"]
     });
 

src/resolve-config-editorconfig.js

@@ -0,0 +1,47 @@
+"use strict";
+
+const editorconfig = require("editorconfig");
+const mem = require("mem");
+const pathRoot = require("path-root");
+const editorConfigToPrettier = require("editorconfig-to-prettier");
+
+const maybeParse = (filePath, config, parse) => {
+  const root = filePath && pathRoot(filePath);
+  return filePath && !config && parse(filePath, { root });
+};
+
+const editorconfigAsyncNoCache = (filePath, config) => {
+  return Promise.resolve(maybeParse(filePath, config, editorconfig.parse)).then(
+    editorConfigToPrettier
+  );
+};
+const editorconfigAsyncWithCache = mem(editorconfigAsyncNoCache);
+
+const editorconfigSyncNoCache = (filePath, config) => {
+  return editorConfigToPrettier(
+    maybeParse(filePath, config, editorconfig.parseSync)
+  );
+};
+const editorconfigSyncWithCache = mem(editorconfigSyncNoCache);
+
+function getLoadFunction(opts) {
+  if (!opts.editorconfig) {
+    return () => null;
+  }
+
+  if (opts.sync) {
+    return opts.cache ? editorconfigSyncWithCache : editorconfigSyncNoCache;
+  }
+
+  return opts.cache ? editorconfigAsyncWithCache : editorconfigAsyncNoCache;
+}
+
+function clearCache() {
+  mem.clear(editorconfigSyncWithCache);
+  mem.clear(editorconfigAsyncWithCache);
+}
+
+module.exports = {
+  getLoadFunction,
+  clearCache
+};

src/resolve-config.js

@@ -5,6 +5,8 @@ const minimatch = require("minimatch");
 const path = require("path");
 const mem = require("mem");
 
+const resolveEditorConfig = require("./resolve-config-editorconfig");
+
 const getExplorerMemoized = mem(opts =>
   thirdParty.cosmiconfig("prettier", {
     sync: opts.sync,
@@ -26,23 +28,47 @@ function getLoadFunction(opts) {
   return getExplorerMemoized(opts).load;
 }
 
-function resolveConfig(filePath, opts) {
+function _resolveConfig(filePath, opts, sync) {
   opts = Object.assign({ useCache: true }, opts);
-  const load = getLoadFunction({ cache: !!opts.useCache, sync: false });
-  return load(filePath, opts.config).then(result => {
-    return !result ? null : mergeOverrides(result, filePath);
-  });
+  const loadOpts = {
+    cache: !!opts.useCache,
+    sync: !!sync,
+    editorconfig: !!opts.editorconfig
+  };
+  const load = getLoadFunction(loadOpts);
+  const loadEditorConfig = resolveEditorConfig.getLoadFunction(loadOpts);
+  const arr = [load, loadEditorConfig].map(l => l(filePath, opts.config));
+
+  const unwrapAndMerge = arr => {
+    const result = arr[0];
+    const editorConfigured = arr[1];
+    const merged = Object.assign(
+      {},
+      editorConfigured,
+      mergeOverrides(Object.assign({}, result), filePath)
+    );
+
+    if (!result && !editorConfigured) {
+      return null;
+    }
+
+    return merged;
+  };
+
+  if (loadOpts.sync) {
+    return unwrapAndMerge(arr);
+  }
+
+  return Promise.all(arr).then(unwrapAndMerge);
 }
 
-resolveConfig.sync = (filePath, opts) => {
-  opts = Object.assign({ useCache: true }, opts);
-  const load = getLoadFunction({ cache: !!opts.useCache, sync: true });
-  const result = load(filePath, opts.config);
-  return !result ? null : mergeOverrides(result, filePath);
-};
+const resolveConfig = (filePath, opts) => _resolveConfig(filePath, opts, false);
+
+resolveConfig.sync = (filePath, opts) => _resolveConfig(filePath, opts, true);
 
 function clearCache() {
   mem.clear(getExplorerMemoized);
+  resolveEditorConfig.clearCache();
 }
 
 function resolveConfigFile(filePath) {

tests_integration/__tests__/__snapshots__/config-resolution.js.snap

@@ -3,7 +3,22 @@
 exports[`CLI overrides take precedence (stderr) 1`] = `""`;
 
 exports[`CLI overrides take precedence (stdout) 1`] = `
-"console.log(
+"function f() {
+	console.log(
+		\\"should have tab width 8\\"
+	)
+}
+function f() {
+  console.log(
+    \\"should have space width 2\\"
+  )
+}
+function f() {
+        console.log(
+                \\"should have space width 8\\"
+        )
+}
+console.log(
   \\"jest/__best-tests__/file.js should have semi\\"
 );
 console.log(
@@ -84,7 +99,16 @@ exports[`resolves configuration file with --find-config-path file (write) 1`] =
 exports[`resolves configuration from external files (stderr) 1`] = `""`;
 
 exports[`resolves configuration from external files (stdout) 1`] = `
-"console.log(\\"jest/__best-tests__/file.js should have semi\\");
+"function f() {
+	console.log(\\"should have tab width 8\\")
+}
+function f() {
+  console.log(\\"should have space width 2\\")
+}
+function f() {
+        console.log(\\"should have space width 8\\")
+}
+console.log(\\"jest/__best-tests__/file.js should have semi\\");
 console.log(\\"jest/Component.js should not have semi\\")
 console.log(\\"jest/Component.test.js should have semi\\");
 function js() {

tests_integration/__tests__/__snapshots__/early-exit.js.snap

@@ -89,6 +89,19 @@ Default: -1
 
 exports[`show detailed usage with --help cursor-offset (write) 1`] = `Array []`;
 
+exports[`show detailed usage with --help editorconfig (stderr) 1`] = `""`;
+
+exports[`show detailed usage with --help editorconfig (stdout) 1`] = `
+"--editorconfig
+
+  Take .editorconfig into account when parsing configuration.
+
+Default: true
+"
+`;
+
+exports[`show detailed usage with --help editorconfig (write) 1`] = `Array []`;
+
 exports[`show detailed usage with --help find-config-path (stderr) 1`] = `""`;
 
 exports[`show detailed usage with --help find-config-path (stdout) 1`] = `
@@ -226,6 +239,17 @@ exports[`show detailed usage with --help no-config (stdout) 1`] = `
 
 exports[`show detailed usage with --help no-config (write) 1`] = `Array []`;
 
+exports[`show detailed usage with --help no-editorconfig (stderr) 1`] = `""`;
+
+exports[`show detailed usage with --help no-editorconfig (stdout) 1`] = `
+"--no-editorconfig
+
+  Don't take .editorconfig into account when parsing configuration.
+"
+`;
+
+exports[`show detailed usage with --help no-editorconfig (write) 1`] = `Array []`;
+
 exports[`show detailed usage with --help no-semi (stderr) 1`] = `""`;
 
 exports[`show detailed usage with --help no-semi (stdout) 1`] = `
@@ -522,6 +546,7 @@ Config options:
   --config-precedence <cli-override|file-override|prefer-file>
                            Define in which order config files and CLI options should be evaluated.
                            Defaults to cli-override.
+  --no-editorconfig        Don't take .editorconfig into account when parsing configuration.
   --find-config-path <path>
                            Find and print the path to a configuration file for the given input file.
   --ignore-path <path>     Path to a file with patterns describing files to ignore.
@@ -660,6 +685,7 @@ Config options:
   --config-precedence <cli-override|file-override|prefer-file>
                            Define in which order config files and CLI options should be evaluated.
                            Defaults to cli-override.
+  --no-editorconfig        Don't take .editorconfig into account when parsing configuration.
   --find-config-path <path>
                            Find and print the path to a configuration file for the given input file.
   --ignore-path <path>     Path to a file with patterns describing files to ignore.

tests_integration/__tests__/__snapshots__/with-config-precedence.js.snap

@@ -80,7 +80,22 @@ exports[`CLI overrides take lower precedence with --config-precedence file-overr
 exports[`CLI overrides take precedence with --config-precedence cli-override (stderr) 1`] = `""`;
 
 exports[`CLI overrides take precedence with --config-precedence cli-override (stdout) 1`] = `
-"console.log(
+"function f() {
+	console.log(
+		\\"should have tab width 8\\"
+	)
+}
+function f() {
+  console.log(
+    \\"should have space width 2\\"
+  )
+}
+function f() {
+        console.log(
+                \\"should have space width 8\\"
+        )
+}
+console.log(
   \\"jest/__best-tests__/file.js should have semi\\"
 );
 console.log(
@@ -137,7 +152,22 @@ exports[`CLI overrides take precedence with --config-precedence cli-override (wr
 exports[`CLI overrides take precedence without --config-precedence (stderr) 1`] = `""`;
 
 exports[`CLI overrides take precedence without --config-precedence (stdout) 1`] = `
-"console.log(
+"function f() {
+	console.log(
+		\\"should have tab width 8\\"
+	)
+}
+function f() {
+  console.log(
+    \\"should have space width 2\\"
+  )
+}
+function f() {
+        console.log(
+                \\"should have space width 8\\"
+        )
+}
+console.log(
   \\"jest/__best-tests__/file.js should have semi\\"
 );
 console.log(