allow max files no limit option (coderabbitai#31)

<!-- This is an auto-generated comment: release notes by openai -->
### Summary by OpenAI

**Release Notes**

This pull request adds new features to the codebase that allow users to
exclude certain files from being reviewed and specify the maximum number
of files to be reviewed. The `max_files` option has been added to
`README.md` and the default value has been changed from 30 to 40 in
`src/options.ts`. A new `exclude_paths` option has been added to
`src/review.ts` to support excluding files from review.
<!-- end of auto-generated comment: release notes by openai -->

README.md

@@ -88,6 +88,8 @@ See also: [./action.yml](./action.yml)
 
 - `debug`: Enable debug mode, will show messages and responses between OpenAI
   server in CI logs.
+- `max_files`: Maximum number of files to be reviewed. Less than or equal to 0
+  means no limit.
 - `review_comment_lgtm`: Leave comments even the patch is LGTM
 - `path_filters`: Rules to filter files to be reviewed.
 - `temperature`: Temperature of the GPT-3 model.

action.yml

@@ -11,8 +11,8 @@ inputs:
     default: 'false'
   max_files:
     required: false
-    description: 'Max files to review'
-    default: '30'
+    description: 'Max files to review. Less than or equal to 0 means no limit.'
+    default: '40'
   temperature:
     required: false
     description: 'Temperature for GPT model'

src/options.ts

@@ -149,7 +149,7 @@ export class Options {
 
   constructor(
     debug: boolean,
-    max_files = '30',
+    max_files = '40',
     review_comment_lgtm = false,
     path_filters: string[] | null = null,
     system_message = '',

src/review.ts

@@ -66,8 +66,19 @@ export const codeReview = async (
     return
   }
 
-  // check if we are exceeding max_files
-  if (files.length > options.max_files) {
+  // skip files if they are filtered out
+  const filtered_files = []
+  for (const file of files) {
+    if (!options.check_path(file.filename)) {
+      core.info(`skip for excluded path: ${file.filename}`)
+      continue
+    } else {
+      filtered_files.push(file)
+    }
+  }
+
+  // check if we are exceeding max_files and if max_files is <= 0 (no limit)
+  if (filtered_files.length > options.max_files && options.max_files > 0) {
     core.warning("Skipped: too many files to review, can't handle it")
     await commenter.comment(
       `Skipped: too many files to review, can't handle it`,
@@ -79,11 +90,7 @@ export const codeReview = async (
 
   // find patches to review
   const files_to_review: [string, string, string, [number, string][]][] = []
-  for (const file of files) {
-    if (!options.check_path(file.filename)) {
-      core.info(`skip for excluded path: ${file.filename}`)
-      continue
-    }
+  for (const file of filtered_files) {
     // retrieve file contents
     let file_content = ''
     try {