lines_per_usd.sh

#!/bin/bash

START_DATE="2025-07-01"
GIT_TMP=$(mktemp)
CCUSAGE_TMP=$(mktemp)

# 1. Git 每日 Python 行數（新增+刪除）
git log --since="$START_DATE" --pretty=format:'%ad' --date=short --numstat -- '*.py' |
awk '
  NF==1 { date=$1 }
  NF==3 { total[date]+=$1+$2 }
  END {
    for (d in total) print d "\t" total[d]
  }
' | sort > "$GIT_TMP"

# 2. 執行 ccusage JSON 並擷取日期與 totalCost
npx ccusage --json | jq -r '.daily[] | "\(.date)\t\(.totalCost)"' | sort > "$CCUSAGE_TMP"

# 3. 合併並輸出
echo ""
echo "📊 Claude 成本 vs Git Python 行數"
echo -e "Date\t\tTotalLines\tCostUSD\t\tLines/USD"

JOINED=$(join -t $'\t' "$GIT_TMP" "$CCUSAGE_TMP")
if [[ -z "$JOINED" ]]; then
  echo "⚠️ 無法對齊日期，可能是 git 或 ccusage 沒有交集"
else
  echo "$JOINED" | awk -F'\t' '
  {
    lines = $2
    cost = $3
    rate = (cost > 0) ? lines / cost : 0
    printf "%-10s\t%-10s\t%-8.2f\t%-10.2f\n", $1, lines, cost, rate
  }'
fi

# 清理
rm -f "$GIT_TMP" "$CCUSAGE_TMP"