Basic comment updating with prefix

action.yml

@@ -1,15 +1,19 @@
-name: PR Comment from File
-author: Alexander Matheson <[email protected]>
-description: Leaves a comment on an open PR based on the contents of a file.
+name: PR Comment and Update from File
+author: Alexander Matheson <[email protected]> Ethan Graf <[email protected]>
+description: Leaves a comment on an open PR based on the contents of a file. If a comment with the right prefix exists, update instead.
 branding:
   icon: 'message-square'  
   color: 'black'
 inputs:
   path: 
     description: file path
     required: true
+  prefix:
+    description: comment prefix
+    required: true
 runs:
   using: 'docker'
   image: 'Dockerfile'
   args:
-    - ${{ inputs.path }}
+    - ${{ inputs.path }}
+    - ${{ inputs.prefix }}

entrypoint.sh

@@ -13,8 +13,8 @@ if !ENV["GITHUB_TOKEN"]
   exit(1)
 end
 
-if ARGV.empty?
-  puts "Missing file path argument."
+if ARGV.length < 2
+  puts "Missing arguments."
   exit(1)
 end
 
@@ -35,11 +35,17 @@ else
   pr_number = pr["number"]
 end
 file_path = ARGV[0]
+prefix = ARGV[1]
 
 puts Dir.entries(".")
 
 message = File.read(file_path)
 
 coms = github.issue_comments(repo, pr_number)
 
-github.add_comment(repo, pr_number, message)
+com = coms.find { |com| com["body"].start_with?(prefix) }
+if com == nil
+  github.add_comment(repo, pr_number, prefix + "\n\n" + message)
+else
+  com = github.update_comment(repo, com["id"], com["body"] + "\n\n" + message)
+end