skills/ce-resolve-pr-feedback/scripts/reply-to-pr-thread

#!/usr/bin/env bash

# Replies directly to a PR review thread's root comment. Body is read from
# stdin to preserve Markdown quotes and newlines. The REST reply endpoint is
# load-bearing: GraphQL addPullRequestReviewThreadReply can attach the reply to
# a pending review and return success before the reply is submitted or visible.

set -e

if [ $# -lt 2 ]; then
    echo "Usage: reply-to-pr-thread PR_NUMBER ROOT_COMMENT_ID [OWNER/REPO] < reply-body.md"
    echo "Example: reply-to-pr-thread 123 456789 EveryInc/cora < reply-body.md"
    exit 1
fi

PR_NUMBER=$1
ROOT_COMMENT_ID=$2
BODY=$(cat)

if [ -n "$3" ]; then
    OWNER=$(echo "$3" | cut -d/ -f1)
    REPO=$(echo "$3" | cut -d/ -f2)
else
    OWNER=$(gh repo view --json owner -q .owner.login 2>/dev/null || true)
    REPO=$(gh repo view --json name -q .name 2>/dev/null || true)
fi

if [ -z "$OWNER" ] || [ -z "$REPO" ]; then
    echo "Error: could not resolve owner/repo. Pass OWNER/REPO as the third argument." >&2
    exit 1
fi

case "$PR_NUMBER" in
    ''|*[!0-9]*) echo "Error: PR_NUMBER must be numeric." >&2; exit 1 ;;
esac

case "$ROOT_COMMENT_ID" in
    ''|*[!0-9]*) echo "Error: ROOT_COMMENT_ID must be numeric." >&2; exit 1 ;;
esac

if [ -z "$BODY" ]; then
    echo "Error: No body provided on stdin."
    exit 1
fi

gh api --method POST \
  "repos/$OWNER/$REPO/pulls/$PR_NUMBER/comments/$ROOT_COMMENT_ID/replies" \
  -f body="$BODY"

PENDING_REVIEW=$(gh api --paginate \
  "repos/$OWNER/$REPO/pulls/$PR_NUMBER/reviews" \
  --jq '.[] | select(.state == "PENDING") | .id')

if [ -n "$PENDING_REVIEW" ]; then
    echo "Error: a pending review appeared after posting. Stop without resolving the thread; do not submit or discard the review." >&2
    exit 2
fi