Added support for reading from stdin, and for the "--stdin-filepath" …

…option

package.json

@@ -46,6 +46,7 @@
     "kasi": "^1.1.0",
     "lomemo": "^1.0.0",
     "pioppo": "^1.1.1",
+    "promise-resolve-timeout": "^2.0.0",
     "specialist": "^1.4.0",
     "tiny-editorconfig": "^1.0.0",
     "tiny-jsonc": "^1.0.1",

src/bin.ts

@@ -133,16 +133,13 @@ const makeBin = (): Bin => {
         "--require-pragma",
         'Require either "@prettier" or "@format" to be present in the file\'s first docblock comment in order for it to be formatted\nDefaults to "false"',
       )
-      // .option(
-      //   "--stdin-filepath <path>",
-      //   "Path to the file to pretend that stdin comes from",
-      // )
+      .option("--stdin-filepath <path>", "Path to the file to pretend that stdin comes from")
       // .option("--support-info", "Print support information as JSON")
       /* DEFAULT COMMAND */
       .argument("[file/dir/glob...]", "Files, directories or globs to format")
       .action(async (options, files) => {
         const { run } = await import("./index.js");
-        const baseOptions = normalizeOptions(options, files);
+        const baseOptions = await normalizeOptions(options, files);
         const pluginsOptions = {};
         return run(baseOptions, pluginsOptions);
       })
@@ -205,7 +202,7 @@ const makePluggableBin = async (): Promise<Bin> => {
 
   bin = bin.action(async (options, files) => {
     const { run } = await import("./index.js");
-    const baseOptions = normalizeOptions(options, files);
+    const baseOptions = await normalizeOptions(options, files);
     const pluginsDynamicOptions = normalizePluginOptions(options, optionsNames);
     const pluginsOptions = { ...pluginsStaticOptions, ...pluginsDynamicOptions };
     return run(baseOptions, pluginsOptions);

src/index.ts

@@ -11,11 +11,37 @@ import { PRETTIER_VERSION, CLI_VERSION } from "./constants.js";
 import Known from "./known.js";
 import Logger from "./logger.js";
 import { makePrettier } from "./prettier.js";
-import { castArray, getExpandedFoldersPaths, getFoldersChildrenPaths, getPluginsVersions, getProjectPath, getTargetsPaths } from "./utils.js";
+import { castArray, getExpandedFoldersPaths, getFoldersChildrenPaths, getPluginsVersions, getProjectPath, getStdin, getTargetsPaths } from "./utils.js";
 import { fastRelativePath, isString, isUndefined, negate, pluralize, uniq } from "./utils.js";
 import type { FormatOptions, Options, PluginsOptions } from "./types.js";
 
-async function run(options: Options, pluginsOptions: PluginsOptions): Promise<void> {
+async function run(options: Options, pluginsOptions): Promise<void> {
+  const stdin = await getStdin();
+  if (isString(stdin)) {
+    return runStdin(options, pluginsOptions);
+  } else {
+    return runGlobs(options, pluginsOptions);
+  }
+}
+
+async function runStdin(options: Options, pluginsOptions: PluginsOptions): Promise<void> {
+  const logger = new Logger(options.logLevel);
+  const prettier = await import("./prettier_serial.js");
+
+  const fileName = options.stdinFilepath || "stdin";
+  const fileContent = (await getStdin()) || "";
+
+  try {
+    const formatted = await prettier.format(fileName, fileContent, options.formatOptions, options.contextOptions, pluginsOptions);
+    logger.always(formatted);
+    process.exitCode = options.check && formatted !== fileContent ? 1 : 0;
+  } catch (error) {
+    logger.prefixed.error(String(error));
+    process.exitCode = 1;
+  }
+}
+
+async function runGlobs(options: Options, pluginsOptions: PluginsOptions): Promise<void> {
   const logger = new Logger(options.logLevel);
   const spinner = options.check ? logger.spinner.log() : undefined;
 
@@ -193,4 +219,4 @@ async function run(options: Options, pluginsOptions: PluginsOptions): Promise<vo
   process.exitCode = (!totalMatched && options.errorOnUnmatchedPattern) || totalErrored || (totalUnformatted && !options.write) ? 1 : 0;
 }
 
-export { run };
+export { run, runStdin, runGlobs };

src/types.ts

@@ -63,6 +63,7 @@ type Options = {
   logLevel: LogLevel;
   parallel: boolean;
   parallelWorkers: number;
+  stdinFilepath: string | undefined;
   /* CONTEXT OPTIONS */
   contextOptions: ContextOptions;
   /* FORMAT OPTIONS */

src/utils.ts

@@ -6,7 +6,9 @@ import crypto from "node:crypto";
 import fs from "node:fs";
 import path from "node:path";
 import process from "node:process";
+import { text as stream2text } from "node:stream/consumers";
 import url from "node:url";
+import resolveTimeout from "promise-resolve-timeout";
 import { exit } from "specialist";
 import readdir from "tiny-readdir-glob";
 import zeptomatchEscape from "zeptomatch-escape";
@@ -166,6 +168,15 @@ function getProjectPath(rootPath: string): string {
   }
 }
 
+const getStdin = once(async (): Promise<string | undefined> => {
+  // Without a TTY, the process is likely, but not certainly, being piped
+  if (!process.stdin.isTTY) {
+    const stdin = stream2text(process.stdin);
+    const fallback = resolveTimeout(1_000, undefined);
+    return Promise.race([stdin, fallback]);
+  }
+});
+
 async function getTargetsPaths(
   rootPath: string,
   globs: string[],
@@ -262,15 +273,16 @@ function noop(): undefined {
   return;
 }
 
-function normalizeOptions(options: unknown, targets: unknown[]): Options {
+async function normalizeOptions(options: unknown, targets: unknown[]): Promise<Options> {
   if (!isObject(options)) exit("Invalid options object");
 
   const targetsGlobs = targets.filter(isString);
-
   const targetsStatic = "--" in options && Array.isArray(options["--"]) ? options["--"].filter(isString).map(zeptomatchEscape) : [];
   const globs = [...targetsGlobs, ...targetsStatic];
 
-  if (!globs.length) exit("Expected at least one target file/dir/glob");
+  const stdin = await getStdin();
+
+  if (!isString(stdin) && !globs.length) exit("Expected at least one target file/dir/glob");
 
   const check = "check" in options && !!options.check;
   const list = "listDifferent" in options && !!options.listDifferent;
@@ -296,6 +308,7 @@ function normalizeOptions(options: unknown, targets: unknown[]): Options {
   const logLevel = "logLevel" in options ? ((options.logLevel || "log") as LogLevel) : "log";
   const parallel = "parallel" in options && !!options.parallel;
   const parallelWorkers = ("parallelWorkers" in options && Math.round(Number(options.parallelWorkers))) || 0;
+  const stdinFilepath = "stdinFilepath" in options && isString(options.stdinFilepath) ? options.stdinFilepath : undefined;
 
   const contextOptions = normalizeContextOptions(options);
   const formatOptions = normalizeFormatOptions(options);
@@ -317,6 +330,7 @@ function normalizeOptions(options: unknown, targets: unknown[]): Options {
     logLevel,
     parallel,
     parallelWorkers,
+    stdinFilepath,
     contextOptions,
     formatOptions,
   };
@@ -631,6 +645,7 @@ export {
   getPluginsPaths,
   getPluginsVersions,
   getProjectPath,
+  getStdin,
   getTargetsPaths,
   isArray,
   isBoolean,