From 103278ecb9b08e65658a83faa3e82998b7750ba3 Mon Sep 17 00:00:00 2001
From: Patrik Oldsberg <poldsberg@gmail.com>
Date: Sun, 13 Feb 2022 21:27:28 +0100
Subject: [PATCH] cli: add --since flag for repo lint command

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
---
 packages/cli/src/commands/index.ts     | 4 ++++
 packages/cli/src/commands/repo/lint.ts | 7 ++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/packages/cli/src/commands/index.ts b/packages/cli/src/commands/index.ts
index b3c9bae6a4..6f534d3e62 100644
--- a/packages/cli/src/commands/index.ts
+++ b/packages/cli/src/commands/index.ts
@@ -51,6 +51,10 @@ export function registerRepoCommand(program: CommanderStatic) {
       'Lint report output format',
       'eslint-formatter-friendly',
     )
+    .option(
+      '--since <ref>',
+      'Only lint packages that changed since the specified ref',
+    )
     .option('--fix', 'Attempt to automatically fix violations')
     .action(lazy(() => import('./repo/lint').then(m => m.command)));
 }
diff --git a/packages/cli/src/commands/repo/lint.ts b/packages/cli/src/commands/repo/lint.ts
index 4c1b912d92..08d111712d 100644
--- a/packages/cli/src/commands/repo/lint.ts
+++ b/packages/cli/src/commands/repo/lint.ts
@@ -22,7 +22,12 @@ import { runWorkerQueueThreads } from '../../lib/parallel';
 import { paths } from '../../lib/paths';
 
 export async function command(cmd: Command): Promise<void> {
-  const packages = await PackageGraph.listTargetPackages();
+  let packages = await PackageGraph.listTargetPackages();
+
+  if (cmd.since) {
+    const graph = PackageGraph.fromPackages(packages);
+    packages = await graph.listChangedPackages({ ref: cmd.since });
+  }
 
   // This formatter uses the cwd to format file paths, so let's have that happen from the root instead
   if (cmd.format === 'eslint-formatter-friendly') {