gemini-cli/.github/scripts/pr-triage.sh

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#!/usr/bin/env bash
# @license
# Copyright 2026 Google LLC
# SPDX-License-Identifier: Apache-2.0
set -euo pipefail
# Initialize a comma-separated string to hold PR numbers that need a comment
PRS_NEEDING_COMMENT=""
# Global cache for issue labels (compatible with Bash 3.2)
# Stores "|ISSUE_NUM:LABELS|" segments
ISSUE_LABELS_CACHE_FLAT="|"
# Function to get labels from an issue (with caching)
get_issue_labels() {
local ISSUE_NUM="${1}"
if [[ -z "${ISSUE_NUM}" || "${ISSUE_NUM}" == "null" || "${ISSUE_NUM}" == "" ]]; then
return
fi
# Check cache
case "${ISSUE_LABELS_CACHE_FLAT}" in
*"|${ISSUE_NUM}:"*)
local suffix="${ISSUE_LABELS_CACHE_FLAT#*|${ISSUE_NUM}:}"
echo "${suffix%%|*}"
return
;;
*)
# Cache miss, proceed to fetch
;;
esac
echo " 📥 Fetching labels from issue #${ISSUE_NUM}" >&2
local gh_output
if ! gh_output=$(gh issue view "${ISSUE_NUM}" --repo "${GITHUB_REPOSITORY}" --json labels -q '.labels[].name' 2>/dev/null); then
echo " ⚠️ Could not fetch issue #${ISSUE_NUM}" >&2
ISSUE_LABELS_CACHE_FLAT="${ISSUE_LABELS_CACHE_FLAT}${ISSUE_NUM}:|"
return
fi
local labels
labels=$(echo "${gh_output}" | grep -x -E '(area|priority)/.*|help wanted|🔒 maintainer only' | tr '\n' ',' | sed 's/,$//' || echo "")
# Save to flat cache
ISSUE_LABELS_CACHE_FLAT="${ISSUE_LABELS_CACHE_FLAT}${ISSUE_NUM}:${labels}|"
echo "${labels}"
}
# Function to process a single PR with pre-fetched data
process_pr_optimized() {
local PR_NUMBER="${1}"
local IS_DRAFT="${2}"
local ISSUE_NUMBER="${3}"
local CURRENT_LABELS="${4}" # Comma-separated labels
echo "🔄 Processing PR #${PR_NUMBER}"
local LABELS_TO_ADD=""
local LABELS_TO_REMOVE=""
if [[ -z "${ISSUE_NUMBER}" || "${ISSUE_NUMBER}" == "null" || "${ISSUE_NUMBER}" == "" ]]; then
if [[ "${IS_DRAFT}" == "true" ]]; then
echo " 📝 PR #${PR_NUMBER} is a draft and has no linked issue"
if [[ ",${CURRENT_LABELS}," == *",status/need-issue,"* ]]; then
echo " Removing status/need-issue label"
LABELS_TO_REMOVE="status/need-issue"
fi
else
echo " ⚠️ No linked issue found for PR #${PR_NUMBER}"
if [[ ",${CURRENT_LABELS}," != *",status/need-issue,"* ]]; then
echo " Adding status/need-issue label"
LABELS_TO_ADD="status/need-issue"
fi
if [[ -z "${PRS_NEEDING_COMMENT}" ]]; then
PRS_NEEDING_COMMENT="${PR_NUMBER}"
else
PRS_NEEDING_COMMENT="${PRS_NEEDING_COMMENT},${PR_NUMBER}"
fi
fi
else
echo " 🔗 Found linked issue #${ISSUE_NUMBER}"
if [[ ",${CURRENT_LABELS}," == *",status/need-issue,"* ]]; then
echo " Removing status/need-issue label"
LABELS_TO_REMOVE="status/need-issue"
fi
local ISSUE_LABELS
ISSUE_LABELS=$(get_issue_labels "${ISSUE_NUMBER}")
if [[ -n "${ISSUE_LABELS}" ]]; then
local IFS_OLD="${IFS}"
IFS=','
for label in ${ISSUE_LABELS}; do
if [[ -n "${label}" ]] && [[ ",${CURRENT_LABELS}," != *",${label},"* ]]; then
if [[ -z "${LABELS_TO_ADD}" ]]; then
LABELS_TO_ADD="${label}"
else
LABELS_TO_ADD="${LABELS_TO_ADD},${label}"
fi
fi
done
IFS="${IFS_OLD}"
fi
if [[ -z "${LABELS_TO_ADD}" && -z "${LABELS_TO_REMOVE}" ]]; then
echo " ✅ Labels already synchronized"
fi
fi
if [[ -n "${LABELS_TO_ADD}" || -n "${LABELS_TO_REMOVE}" ]]; then
local EDIT_CMD=("gh" "pr" "edit" "${PR_NUMBER}" "--repo" "${GITHUB_REPOSITORY}")
if [[ -n "${LABELS_TO_ADD}" ]]; then
echo " Syncing labels to add: ${LABELS_TO_ADD}"
EDIT_CMD+=("--add-label" "${LABELS_TO_ADD}")
fi
if [[ -n "${LABELS_TO_REMOVE}" ]]; then
echo " Syncing labels to remove: ${LABELS_TO_REMOVE}"
EDIT_CMD+=("--remove-label" "${LABELS_TO_REMOVE}")
fi
("${EDIT_CMD[@]}" || true)
fi
}
if [[ -z "${GITHUB_REPOSITORY:-}" ]]; then
echo "‼️ Missing \$GITHUB_REPOSITORY - this must be run from GitHub Actions"
exit 1
fi
if [[ -z "${GITHUB_OUTPUT:-}" ]]; then
echo "‼️ Missing \$GITHUB_OUTPUT - this must be run from GitHub Actions"
exit 1
fi
JQ_EXTRACT_FIELDS='{
number: .number,
isDraft: .isDraft,
issue: (.closingIssuesReferences[0].number // (.body // "" | capture("(^|[^a-zA-Z0-9])#(?<num>[0-9]+)([^a-zA-Z0-9]|$)")? | .num) // "null"),
labels: [.labels[].name] | join(",")
}'
JQ_TSV_FORMAT='"\((.number | tostring))\t\(.isDraft)\t\((.issue // null) | tostring)\t\(.labels)"'
if [[ -n "${PR_NUMBER:-}" ]]; then
echo "🔄 Processing single PR #${PR_NUMBER}"
PR_DATA=$(gh pr view "${PR_NUMBER}" --repo "${GITHUB_REPOSITORY}" --json number,closingIssuesReferences,isDraft,body,labels 2>/dev/null) || {
echo "❌ Failed to fetch data for PR #${PR_NUMBER}"
exit 1
}
line=$(echo "${PR_DATA}" | jq -r "${JQ_EXTRACT_FIELDS} | ${JQ_TSV_FORMAT}")
IFS=$'\t' read -r pr_num is_draft issue_num current_labels <<< "${line}"
process_pr_optimized "${pr_num}" "${is_draft}" "${issue_num}" "${current_labels}"
else
echo "📥 Getting all open pull requests..."
PR_DATA_ALL=$(gh pr list --repo "${GITHUB_REPOSITORY}" --state open --limit 1000 --json number,closingIssuesReferences,isDraft,body,labels 2>/dev/null) || {
echo "❌ Failed to fetch PR list"
exit 1
}
PR_COUNT=$(echo "${PR_DATA_ALL}" | jq '. | length')
echo "📊 Found ${PR_COUNT} open PRs to process"
# Use a temporary file to avoid masking exit codes in process substitution
tmp_file=$(mktemp)
echo "${PR_DATA_ALL}" | jq -r ".[] | ${JQ_EXTRACT_FIELDS} | ${JQ_TSV_FORMAT}" > "${tmp_file}"
while read -r line; do
[[ -z "${line}" ]] && continue
IFS=$'\t' read -r pr_num is_draft issue_num current_labels <<< "${line}"
process_pr_optimized "${pr_num}" "${is_draft}" "${issue_num}" "${current_labels}"
done < "${tmp_file}"
rm -f "${tmp_file}"
fi
if [[ -z "${PRS_NEEDING_COMMENT}" ]]; then
echo "prs_needing_comment=[]" >> "${GITHUB_OUTPUT}"
else
echo "prs_needing_comment=[${PRS_NEEDING_COMMENT}]" >> "${GITHUB_OUTPUT}"
fi
echo "✅ PR triage completed"