statusline.fish

#!/usr/bin/env fish
# ==============================================================================
# Claude Code Status Line Configuration
# ==============================================================================
#
# This script customizes the Claude Code status bar to display contextual
# session information at the bottom of the interface.
#
# ## What This Shows
#
# [Model] [SessionID] 📁 directory | 💰 $cost | Context: X%
#
# Example output:
# [Opus] [a3f1b2c4] 📁 ghee-mail | 💰 $0.0123 | Context: 12%
#
# ## Components
#
# - **Model**: Display name (Opus, Sonnet, Haiku)
# - **SessionID**: First 8 characters of unique session identifier
# - **Directory**: Current working directory basename
# - **Cost**: Total session cost in USD
# - **Context**: Percentage of context window used
#
# ## Setup
#
# 1. Make this script executable:
#    chmod +x ~/.claude/statusline.sh
#
# 2. Add to ~/.claude/settings.json:
#    {
#      "statusLine": {
#        "type": "command",
#        "command": "~/.claude/statusline.sh",
#        "padding": 0
#      }
#    }
#
# 3. Restart Claude Code
#
# ## Available Data Fields
#
# Claude Code provides this JSON structure via stdin:
#
# {
#   "session_id": "abc123...",                    // Unique session identifier
#   "model": {
#     "id": "claude-opus-4-1",
#     "display_name": "Opus"                      // Short model name
#   },
#   "workspace": {
#     "current_dir": "/current/working/directory",
#     "project_dir": "/original/project/directory"
#   },
#   "version": "1.0.80",                          // Claude Code version
#   "cost": {
#     "total_cost_usd": 0.01234,
#     "total_duration_ms": 45000,
#     "total_api_duration_ms": 2300,
#     "total_lines_added": 156,
#     "total_lines_removed": 23
#   },
#   "context_window": {
#     "total_input_tokens": 15234,
#     "total_output_tokens": 4521,
#     "context_window_size": 200000
#   },
#   "output_style": {
#     "name": "default"
#   }
# }
#
# ## Customization Examples
#
# ### Add Git Branch
#
# set -l git_branch ""
# if git rev-parse --git-dir >/dev/null 2>&1
#     set git_branch " | 🌿 "(git branch --show-current 2>/dev/null)
# end
# printf "...$git_branch"
#
# ### Show Lines Modified
#
# set -l lines_added (echo $input | jq -r '.cost.total_lines_added')
# set -l lines_removed (echo $input | jq -r '.cost.total_lines_removed')
# printf "... | +$lines_added -$lines_removed"
#
# ### Show Version
#
# set -l version (echo $input | jq -r '.version')
# printf "... | v$version"
#
# ### Change Colors
#
# ANSI color codes:
# \033[0;31m = red
# \033[0;32m = green
# \033[0;33m = yellow
# \033[0;34m = blue
# \033[0;35m = magenta
# \033[0;36m = cyan
# \033[0m   = reset
#
# ## Testing
#
# Test this script manually:
#
# echo '{"session_id":"abc123def456","model":{"display_name":"Opus"},"workspace":{"current_dir":"/Users/gaston/project"},"cost":{"total_cost_usd":0.0123},"context_window":{"total_input_tokens":15000,"total_output_tokens":5000,"context_window_size":200000}}' | ~/.claude/statusline.sh
#
# Expected output:
# [Opus] [abc123de] 📁 project | 💰 $0.0123 | Context: 10%
#
# ## Troubleshooting
#
# - Status line doesn't appear
#   → Check script is executable: ls -l ~/.claude/statusline.sh
#
# - JSON parsing errors
#   → Ensure jq is installed: brew install jq
#
# - Colors not showing
#   → Test ANSI support: echo -e "\033[0;36mTest\033[0m"
#
# ==============================================================================

# Read JSON from stdin
set -l input (cat)

# Extract values using jq
set -l model (echo $input | jq -r '.model.display_name')
set -l session_id (echo $input | jq -r '.session_id' | string sub -l 8)
set -l current_dir (echo $input | jq -r '.workspace.current_dir' | path basename)
set -l cost (echo $input | jq -r '.cost.total_cost_usd')

# Context window usage
set -l input_tokens (echo $input | jq -r '.context_window.total_input_tokens')
set -l output_tokens (echo $input | jq -r '.context_window.total_output_tokens')
set -l context_size (echo $input | jq -r '.context_window.context_window_size')
set -l total_tokens (math $input_tokens + $output_tokens)
set -l percent_used (math "round($total_tokens * 100 / $context_size)")

# ANSI color codes
set -l cyan (printf '\033[0;36m')
set -l green (printf '\033[0;32m')
set -l yellow (printf '\033[0;33m')
set -l reset (printf '\033[0m')

# Build and output status line
printf "%s[%s]%s [%s%s%s] 📁 %s | 💰 \$%.4f | %sContext: %s%%%s" \
    $cyan $model $reset $yellow $session_id $reset $current_dir $cost $green $percent_used $reset