From 5568b4dc95f9610da3cd4263108f04de94841d6e Mon Sep 17 00:00:00 2001
From: Eric Traut <erictr@microsoft.com>
Date: Mon, 19 Jun 2023 18:00:31 -0700
Subject: [PATCH] Enhanced command-line version of pyright to allow file or
 directory names to be passed via stdin if `-` option is used in the command
 line. This addresses https://github.com/microsoft/pyright/issues/5342.

---
 docs/command-line.md                     |  1 +
 packages/pyright-internal/src/pyright.ts | 23 +++++++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/docs/command-line.md b/docs/command-line.md
index 086844156012..0777f3ef9dfb 100644
--- a/docs/command-line.md
+++ b/docs/command-line.md
@@ -25,6 +25,7 @@ Pyright can be run as either a VS Code extension or as a node-based command-line
 | --version                               | Print pyright version and exit                       |
 | --warnings                              | Use exit code of 1 if warnings are reported          |
 | -w, --watch                             | Continue to run and watch for changes (5)            |
+| -                                       | Read file or directory list from stdin               |
 
 (1) If specific files are specified on the command line, it overrides the files or directories specified in the pyrightconfig.json or pyproject.toml file.
 
diff --git a/packages/pyright-internal/src/pyright.ts b/packages/pyright-internal/src/pyright.ts
index 09fc452a45bf..b524e1a705ed 100644
--- a/packages/pyright-internal/src/pyright.ts
+++ b/packages/pyright-internal/src/pyright.ts
@@ -15,6 +15,7 @@ import { timingStats } from './common/timing';
 
 import chalk from 'chalk';
 import commandLineArgs, { CommandLineOptions, OptionDefinition } from 'command-line-args';
+import * as fs from 'fs';
 
 import { PackageTypeReport, TypeKnownStatus } from './analyzer/packageTypeReport';
 import { PackageTypeVerifier } from './analyzer/packageTypeVerifier';
@@ -218,7 +219,24 @@ async function processArgs(): Promise<ExitStatus> {
 
     // Assume any relative paths are relative to the working directory.
     if (args.files && Array.isArray(args.files)) {
-        options.fileSpecs = args.files;
+        let fileSpecList = args.files;
+
+        // Has the caller indicated that the file list will be supplied by stdin?
+        if (args.files.length === 1 && args.files[0] === '-') {
+            try {
+                const stdText = fs.readFileSync(process.stdin.fd, 'utf-8');
+                fileSpecList = stdText
+                    .trim()
+                    .split(' ')
+                    .map((s) => s.trim())
+                    .filter((s) => !s);
+            } catch (e) {
+                console.error('Invalid file list specified by stdin input.');
+                return ExitStatus.ParameterError;
+            }
+        }
+
+        options.fileSpecs = fileSpecList;
         options.fileSpecs = options.fileSpecs.map((f) => combinePaths(process.cwd(), f));
     } else {
         options.fileSpecs = [];
@@ -729,7 +747,8 @@ function printUsage() {
             '  --verifytypes <PACKAGE>            Verify type completeness of a py.typed package\n' +
             '  --version                          Print Pyright version and exit\n' +
             '  --warnings                         Use exit code of 1 if warnings are reported\n' +
-            '  -w,--watch                         Continue to run and watch for changes\n'
+            '  -w,--watch                         Continue to run and watch for changes\n' +
+            '  -                                  Read files from stdin\n'
     );
 }