From 0af746d048869e137dbe1d55198212fbe11f9114 Mon Sep 17 00:00:00 2001
From: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Date: Mon, 21 Mar 2022 15:41:31 -0700
Subject: [PATCH] mypy_primer: mention if output is truncated (#7525)

---
 .github/workflows/mypy_primer_comment.yml | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/mypy_primer_comment.yml b/.github/workflows/mypy_primer_comment.yml
index 150099130..f0ad1e9f9 100644
--- a/.github/workflows/mypy_primer_comment.yml
+++ b/.github/workflows/mypy_primer_comment.yml
@@ -38,9 +38,8 @@ jobs:
             fs.writeFileSync("diff.zip", Buffer.from(download.data));
 
       - run: unzip diff.zip
-      # 30000 bytes is about 300 lines, posting comment fails if too long
       - run: |
-          cat diff_*.txt | head -c 30000 | tee fulldiff.txt
+          cat diff_*.txt | tee fulldiff.txt
 
       - name: Post comment
         id: post-comment
@@ -49,7 +48,11 @@ jobs:
           github-token: ${{secrets.GITHUB_TOKEN}}
           script: |
             const fs = require('fs')
-            const data = fs.readFileSync('fulldiff.txt', { encoding: 'utf8' })
+            let data = fs.readFileSync('fulldiff.txt', { encoding: 'utf8' })
+            // posting comment fails if too long, so truncate
+            if (data.length > 30000) {
+              data = data.substring(0, 30000) + `\n\n... (truncated ${diff.length - 30000} chars) ...\n`
+            }
 
             let body
             if (data.trim()) {