feat: add limit check and print diff output for --creat-issue command

Author: bombillazo

src/createIssue.ts

@@ -99,8 +99,19 @@ export function openIssueCreationLink({
   if (patchFileContents.endsWith("\n")) {
     patchFileContents = patchFileContents.slice(0, -1)
   }
-
-  open(
+  
+  const bodyExceedsLimit = patchFileContents.length > 300;
+  let diffContents = patchFileContents;
+  if (bodyExceedsLimit) {
+    diffContents = '<!-- 🔺️🔺️🔺️ PLEASE REPLACE THIS BLOCK with the diff contents printed out by the `--create-issue` command. 🔺️🔺️🔺️ -->';
+    console.log(`📋 Copy the following diff contents and paste them into the issue diff section:
+    
+${patchFileContents}
+`);
+  }
+  
+  else {
+    open(
     `https://github.com/${vcs.org}/${vcs.repo}/issues/new?${stringify({
       title: "",
       body: `Hi! 👋 
@@ -114,11 +125,12 @@ Today I used [patch-package](https://github.com/ds300/patch-package) to patch \`
 Here is the diff that solved my problem:
 
 \`\`\`diff
-${patchFileContents}
+${diffContents}
 \`\`\`
 
 <em>This issue body was [partially generated by patch-package](https://github.com/ds300/patch-package/issues/296).</em>
 `,
     })}`,
   )
+  }
 }