Session Timer Statusline

#!/usr/bin/env bash

# Session Timer Statusline for Claude Code
# Tracks session duration and productivity metrics

# Read JSON from stdin
read -r input

# Extract session data
model=$(echo "$input" | jq -r '.model // "unknown"' | sed 's/claude-//')
tokens=$(echo "$input" | jq -r '.session.totalTokens // 0')
cost=$(echo "$input" | jq -r '.session.estimatedCost // 0' | awk '{printf "%.3f", $0}')
session_start=$(echo "$input" | jq -r '.session.startTime // ""')

# Calculate session duration
if [ -n "$session_start" ]; then
  start_epoch=$(date -j -f "%Y-%m-%dT%H:%M:%S" "${session_start%.*}" "+%s" 2>/dev/null || echo "0")
  current_epoch=$(date +%s)
  duration=$((current_epoch - start_epoch))
  
  # Format duration as HH:MM:SS
  hours=$((duration / 3600))
  minutes=$(((duration % 3600) / 60))
  seconds=$((duration % 60))
  formatted_time=$(printf "%02d:%02d:%02d" $hours $minutes $seconds)
  
  # Calculate tokens per minute
  if [ $duration -gt 0 ]; then
    tokens_per_min=$((tokens * 60 / duration))
    
    # Productivity rating
    if [ $tokens_per_min -gt 500 ]; then
      prod_color="\033[32m"  # Green - high productivity
      prod_indicator="🔥"
    elif [ $tokens_per_min -gt 200 ]; then
      prod_color="\033[33m"  # Yellow - medium productivity
      prod_indicator="⚡"
    else
      prod_color="\033[36m"  # Cyan - normal
      prod_indicator="💭"
    fi
  else
    tokens_per_min=0
    prod_color="\033[36m"
    prod_indicator="💭"
  fi
  
  # Calculate cost per hour
  if [ $duration -gt 0 ]; then
    cost_per_hour=$(echo "$cost * 3600 / $duration" | bc -l | awk '{printf "%.2f", $0}')
  else
    cost_per_hour="0.00"
  fi
else
  formatted_time="00:00:00"
  tokens_per_min=0
  cost_per_hour="0.00"
  prod_indicator="💭"
fi

# Build statusline
echo -e "\033[35m⏱  ${formatted_time}\033[0m │ \033[36m${model}\033[0m │ ${prod_color}${prod_indicator} ${tokens_per_min}/min\033[0m │ \033[33m\$${cost_per_hour}/hr\033[0m"

{
  "format": "bash",
  "position": "left",
  "colorScheme": "productivity-metrics",
  "refreshInterval": 1000
}