github-pr-stats

name	github-pr-stats
description	Compute PR statistics (total, merged, closed, avg merge time, top contributor) from GitHub API data using Python or jq.

GitHub PR Statistics

Overview

After fetching PR data from the GitHub API, use Python or jq to compute:

• Total PR count
• Merged vs closed counts
• Average time-to-merge (days)
• Top contributor by PR count

Fetching PRs for a Date Range

# Using gh search (handles pagination, date filtering)
gh pr list -R cli/cli \
  --search "created:2024-12-01..2024-12-31" \
  --state all \
  --limit 500 \
  --json number,author,createdAt,mergedAt,closedAt,state

Python: Compute Stats from JSON

import json
from datetime import datetime, timezone
from collections import Counter

# Load PR data (from gh pr list --json output)
with open('prs.json') as f:
    prs = json.load(f)

total = len(prs)

# Count merged vs closed-but-not-merged
merged = [pr for pr in prs if pr['mergedAt']]
closed = [pr for pr in prs if not pr['mergedAt'] and pr['state'] == 'CLOSED']

# Average time to merge (creation -> mergedAt), in days
def parse_dt(s):
    return datetime.fromisoformat(s.replace('Z', '+00:00'))

merge_days = []
for pr in merged:
    created = parse_dt(pr['createdAt'])
    merged_at = parse_dt(pr['mergedAt'])
    delta = (merged_at - created).total_seconds() / 86400
    merge_days.append(delta)

avg_merge_days = round(sum(merge_days) / len(merge_days), 1) if merge_days else 0.0

# Top contributor
authors = Counter(pr['author']['login'] for pr in prs)
top_contributor = authors.most_common(1)[0][0]

print(json.dumps({
    "total": total,
    "merged": len(merged),
    "closed": len(closed),
    "avg_merge_days": avg_merge_days,
    "top_contributor": top_contributor
}, indent=2))

Notes on State Values

• gh pr list --json returns state as "OPEN", "CLOSED", or "MERGED"
• mergedAt is non-null only for merged PRs
• A PR with state == "CLOSED" and mergedAt == null is truly closed (not merged)

Notes on the Search API

• created:2024-12-01..2024-12-31 is inclusive on both ends
• Dec 31 means up to 2024-12-31T23:59:59Z
• Use --limit 500 to avoid truncation for active repos