CC context statusline

statusline.sh

#!/bin/bash
# Claude Code status line - shows context window usage percentage
# Last update: Claude Code 2.1.34

input=$(cat)

MODEL=$(echo "$input" | jq -r '.model.display_name')
MODEL_ID=$(echo "$input" | jq -r '.model.id')
CONTEXT_SIZE=$(echo "$input" | jq -r '.context_window.context_window_size')
USAGE=$(echo "$input" | jq '.context_window.current_usage')

# Max output tokens for effective window calculation
# CC internally caps this to JE1=20000 when computing the autocompact threshold
# The actual model max doesn't matter here — only the capped value does
MAX_OUTPUT_CAP=20000
case "$MODEL_ID" in
    *opus-4-6*)    MODEL_MAX=128000 ;;
    *opus-4-5*|*sonnet-4*|*haiku-4*) MODEL_MAX=64000 ;;
    *opus-4*)      MODEL_MAX=32000 ;;
    *3-5*)         MODEL_MAX=8192 ;;
    *claude-3-opus*) MODEL_MAX=4096 ;;
    *claude-3-sonnet*) MODEL_MAX=8192 ;;
    *claude-3-haiku*) MODEL_MAX=4096 ;;
    *)             MODEL_MAX=32000 ;;
esac
# min(modelMax, cap)
[ "$MODEL_MAX" -lt "$MAX_OUTPUT_CAP" ] && MAX_OUTPUT=$MODEL_MAX || MAX_OUTPUT=$MAX_OUTPUT_CAP

# Calculate autocompact buffer
# EHA = contextSize - maxOutputTokens (available context)
EHA=$((CONTEXT_SIZE - MAX_OUTPUT))

if [ -n "$CLAUDE_AUTOCOMPACT_PCT_OVERRIDE" ]; then
    # threshold = min(EHA * pct/100, EHA - 13000)
    PCT_THRESHOLD=$((EHA * CLAUDE_AUTOCOMPACT_PCT_OVERRIDE / 100))
    DEFAULT_THRESHOLD=$((EHA - 13000))
    if [ "$PCT_THRESHOLD" -lt "$DEFAULT_THRESHOLD" ]; then
        THRESHOLD=$PCT_THRESHOLD
    else
        THRESHOLD=$DEFAULT_THRESHOLD
    fi
else
    THRESHOLD=$((EHA - 13000))
fi

# Buffer = contextSize - threshold (only if autocompact enabled)
# Check env vars and config file
AUTOCOMPACT_ENABLED=1
# Check DISABLE_COMPACT env var
if [ -n "$DISABLE_COMPACT" ] && [ "$DISABLE_COMPACT" != "0" ] && [ "$DISABLE_COMPACT" != "false" ]; then
    AUTOCOMPACT_ENABLED=0
fi
# Check DISABLE_AUTO_COMPACT env var
if [ -n "$DISABLE_AUTO_COMPACT" ] && [ "$DISABLE_AUTO_COMPACT" != "0" ] && [ "$DISABLE_AUTO_COMPACT" != "false" ]; then
    AUTOCOMPACT_ENABLED=0
fi
# Check config file (defaults to true if not set)
CONFIG_FILE="$HOME/.claude.json"
if [ -f "$CONFIG_FILE" ]; then
    CONFIG_VAL=$(jq -r 'if has("autoCompactEnabled") then .autoCompactEnabled else true end' "$CONFIG_FILE" 2>/dev/null)
    if [ "$CONFIG_VAL" = "false" ]; then
        AUTOCOMPACT_ENABLED=0
    fi
fi

# Calculate buffer based on compact settings
# - Full autocompact enabled: use full threshold buffer
# - Autocompact disabled but compact enabled: use 3k blocking buffer
# - All compact disabled: no buffer
COMPACT_DISABLED=0
if [ -n "$DISABLE_COMPACT" ] && [ "$DISABLE_COMPACT" != "0" ] && [ "$DISABLE_COMPACT" != "false" ]; then
    COMPACT_DISABLED=1
fi

if [ "$AUTOCOMPACT_ENABLED" = "1" ]; then
    BUFFER=$((CONTEXT_SIZE - THRESHOLD))
elif [ "$COMPACT_DISABLED" = "0" ]; then
    BUFFER=3000
else
    BUFFER=0
fi

if [ "$USAGE" != "null" ]; then
    # Calculate current context from current_usage fields
    CURRENT_TOKENS=$(echo "$USAGE" | jq '.input_tokens + .cache_creation_input_tokens + .cache_read_input_tokens')
    # Show usage as % of effective space
    # With autocompact: denominator = threshold (hits 100% when compact triggers)
    # Without autocompact: denominator = effective window (EHA)
    if [ "$AUTOCOMPACT_ENABLED" = "1" ]; then
        EFFECTIVE=$THRESHOLD
    else
        EFFECTIVE=$EHA
    fi
    PERCENT_USED=$((CURRENT_TOKENS * 100 / EFFECTIVE))
    [ "$PERCENT_USED" -gt 100 ] && PERCENT_USED=100

    echo "[$MODEL] Context: ${PERCENT_USED}%"
else
    echo "[$MODEL] Context: n/a"
fi