Building a Custom Status Line for Claude Code

#!/bin/bash
 
input=$(cat)
 
# Extract data
model_name=$(echo "$input" | jq -r '.model.display_name // .model.id')
cwd=$(echo "$input" | jq -r '.workspace.current_dir')
project_dir=$(echo "$input" | jq -r '.workspace.project_dir')
total_input=$(echo "$input" | jq -r '.context_window.total_input_tokens // 0')
context_size=$(echo "$input" | jq -r '.context_window.context_window_size // 0')
used_pct=$(echo "$input" | jq -r '.context_window.used_percentage // 0' | cut -d. -f1)
 
# Shorten model name
short_model="$model_name"
[[ "$model_name" =~ Opus ]] && short_model="Opus 4.5"
[[ "$model_name" =~ Sonnet ]] && short_model="Sonnet 4"
[[ "$model_name" =~ Haiku ]] && short_model="Haiku 3.5"
 
# Format tokens (42000 -> 42k)
format_tokens() {
    local n=$1
    [ "$n" -ge 1000 ] && echo "$((n / 1000))k" || echo "$n"
}
tokens_display=$(format_tokens "$total_input")
context_display=$(format_tokens "$context_size")
 
# Progress bar
bar_width=10
filled=$((used_pct * bar_width / 100))
empty=$((bar_width - filled))
progress_bar="["
for ((i=0; i<filled; i++)); do progress_bar+="="; done
for ((i=0; i<empty; i++)); do progress_bar+=" "; done
progress_bar+="]"
 
# Git info
project_name=$(basename "$project_dir")
git_branch=""
if git -C "$cwd" rev-parse --git-dir > /dev/null 2>&1; then
    git_branch=$(git -C "$cwd" symbolic-ref --short HEAD 2>/dev/null || \
                 git -C "$cwd" rev-parse --short HEAD 2>/dev/null)
fi
 
# Colors
CYAN=$'\033[36m' YELLOW=$'\033[33m' RED=$'\033[31m' BLUE=$'\033[34m' RESET=$'\033[0m'
 
# Build output
if [ -n "$git_branch" ]; then
    dirty=""
    git -C "$cwd" diff-index --quiet HEAD -- 2>/dev/null || dirty=" ${YELLOW}✗${RESET}"
    git_status="${CYAN}${project_name}${RESET}${BLUE}(${RED}${git_branch}${BLUE})${RESET}${dirty}"
else
    git_status="${CYAN}${project_name}${RESET}"
fi
 
echo "${CYAN}${short_model}${RESET} ${progress_bar} ${YELLOW}${used_pct}%${RESET} | ${tokens_display}/${context_display} | ${git_status}"