fix: Fix awk error on macOS runner (#71)

.github/workflows/cr.yml

@@ -8,7 +8,7 @@ on:
       - opened      # Triggers when a PR is opened
       - reopened    # Triggers when a PR is reopened
       - synchronize # Triggers when a commit is pushed to the PR
-      # - labeled     # Triggers when a label is added to the PR
+      # - labeled   # Triggers when a label is added to the PR
 
 # fix: GraphQL: Resource not accessible by integration (addComment) error
 permissions:
@@ -16,7 +16,7 @@ permissions:
 
 jobs:
   setup-deepseek-review:
-    runs-on: ubuntu-latest
+    runs-on: macos-latest
     name: Code Review
     # Make sure the code review happens only when the PR has the label 'ai review'
     # if: contains(github.event.pull_request.labels.*.name, 'ai review')

nu/review.nu

@@ -196,17 +196,31 @@ export def get-diff [
   if ($content | is-empty) {
     print $'(ansi g)Nothing to review.(ansi reset)'; exit $ECODE.SUCCESS
   }
+  let awk_bin = (prepare-awk)
   if ($include | is-not-empty) {
     let patterns = $include | split row ','
-    $content = $content | awk (generate-include-regex $patterns)
+    $content = $content | ^$awk_bin (generate-include-regex $patterns)
   }
   if ($exclude | is-not-empty) {
     let patterns = $exclude | split row ','
-    $content = $content | awk (generate-exclude-regex $patterns)
+    $content = $content | ^$awk_bin (generate-exclude-regex $patterns)
   }
   $content
 }
 
+# Prepare gawk for macOS
+export def prepare-awk [] {
+  if (is-installed awk) {
+    print $'Current awk version: (awk --version | lines | first)'
+  }
+  if ($env.GITHUB_ACTIONS? != 'true') { return 'awk' }
+  if (sys host | get name) == 'Darwin' {
+    brew install gawk
+    print $'Current gawk version: (gawk --version | lines | first)'
+  }
+  'gawk'
+}
+
 # Compact the record by removing empty columns
 export def compact-record []: record -> record {
   let record = $in