#2397: limit maximum length of clang-format output

Author: cz4rs

.github/workflows/run-clang-format.yml

@@ -38,7 +38,13 @@ jobs:
 
             const fs = require("fs").promises
             var output = await fs.readFile("clang-format.diff")
-            const commentBody = '`clang-format` output for this changeset:\n```diff\n' + output + '\n```'
+            // make sure not to exceed maximum length of the comment
+            output = (output.length > 65000) ?
+              output.substring(0, 65000) + '\n(...)' : output
+            const commentBody =
+              '`clang-format` output for this changeset:\n```diff\n' +
+              output + '\n```'
+
             if (commentId === -1) {
               await github.rest.issues.createComment({
                 owner: context.repo.owner,