Shows model (when non-default), repo:branch/path, context window %,
session cost, and output style. Useful for monitoring long sessions.

Assisted-by: Claude Opus 4.5 via Claude Code

diff --git a/ai/claude/statusline.sh b/ai/claude/statusline.sh
new file mode 100755
index 00000000..7ac9bab9
--- /dev/null
+++ b/ai/claude/statusline.sh
@@ -0,0 +1,115 @@
+#!/bin/bash
+
+# Read JSON input from stdin
+input=$(cat)
+
+# Extract and format model name (e.g., "claude-sonnet-4-5-..." -> "sonnet-4.5")
+model_id=$(echo "$input" | jq -r '.model.id')
+model=$(echo "$model_id" | sed -E 's/.*claude-([^-]+)-([0-9]+)-?([0-9]+)?-.*/\1-\2.\3/' | sed 's/-\.$//')
+
+# Get the default model from settings and format it the same way
+default_model=$(jq -r '.model // "sonnet"' ~/.claude/settings.json)
+
+# Only show model if it's not the default
+if [[ "$model" =~ ^${default_model} ]]; then
+    model=''
+fi
+
+# Get current working directory
+cwd=$(echo "$input" | jq -r '.workspace.current_dir')
+
+# Get output style
+style=$(echo "$input" | jq -r '.output_style.name')
+
+# Get git repository name and root (or fall back to current directory)
+repo=''
+git_root=''
+if git -C "$cwd" rev-parse --git-dir > /dev/null 2>&1; then
+    git_root=$(git -C "$cwd" rev-parse --show-toplevel 2>/dev/null)
+    repo=$(basename "$git_root" 2>/dev/null)
+fi
+if [ -z "$repo" ]; then
+    repo=$(basename "$cwd")
+fi
+
+# Calculate relative path if cwd differs from git root
+rel_path=''
+if [ -n "$git_root" ] && [ "$cwd" != "$git_root" ]; then
+    rel_path="${cwd#$git_root/}"
+fi
+
+# Get git branch
+branch=$(git -C "$cwd" branch --show-current 2>/dev/null || echo '')
+
+# Calculate context window usage percentage
+ctx=''
+usage=$(echo "$input" | jq '.context_window.current_usage')
+if [ "$usage" != 'null' ]; then
+    cur=$(($(echo "$usage" | jq '.input_tokens + .cache_creation_input_tokens + .cache_read_input_tokens')))
+    sz=$(echo "$input" | jq '.context_window.context_window_size')
+    pct=$((cur * 100 / sz))
+    ctx=$(printf " \033[2m•\033[0m \033[33m%s%%\033[0m" "$pct")
+fi
+
+# Format output style
+sty=''
+if [ "$style" != 'null' ] && [ "$style" != 'default' ]; then
+    sty=$(printf " \033[2m•\033[0m \033[35m%s\033[0m" "$style")
+fi
+
+# Calculate session cost
+cost=''
+total_input=$(echo "$input" | jq '.context_window.total_input_tokens // 0')
+total_output=$(echo "$input" | jq '.context_window.total_output_tokens // 0')
+if [ "$total_input" != "0" ] || [ "$total_output" != "0" ]; then
+    # Pricing per million tokens (as of Jan 2025)
+    # Opus 4.5: $15 input, $75 output
+    # Sonnet 4.5: $3 input, $15 output
+    # Haiku 4.5: $0.80 input, $4 output
+    if [[ "$model_id" =~ opus ]]; then
+        input_cost=$(echo "scale=4; $total_input * 15 / 1000000" | bc)
+        output_cost=$(echo "scale=4; $total_output * 75 / 1000000" | bc)
+    elif [[ "$model_id" =~ haiku ]]; then
+        input_cost=$(echo "scale=4; $total_input * 0.80 / 1000000" | bc)
+        output_cost=$(echo "scale=4; $total_output * 4 / 1000000" | bc)
+    else
+        # Default to Sonnet pricing
+        input_cost=$(echo "scale=4; $total_input * 3 / 1000000" | bc)
+        output_cost=$(echo "scale=4; $total_output * 15 / 1000000" | bc)
+    fi
+    total_cost=$(echo "scale=2; $input_cost + $output_cost" | bc)
+    # Only show if non-zero
+    if (( $(echo "$total_cost > 0" | bc -l) )); then
+        cost=$(printf " \033[2m•\033[0m \033[36m\$%s\033[0m" "$total_cost")
+    fi
+fi
+
+# Build location string (repo:branch/path or just repo)
+loc=$(printf "\033[34m%s\033[0m" "$repo")
+if [ -n "$branch" ]; then
+    loc=$(printf "%s\033[2m:\033[0m\033[36m%s\033[0m" "$loc" "$branch")
+fi
+if [ -n "$rel_path" ]; then
+    loc=$(printf "%s\033[2m/\033[0m\033[33m%s\033[0m" "$loc" "$rel_path")
+fi
+
+# Build the status line with left-aligned prefix
+# Format: ✴ model • location • context • cost • style
+parts=""
+if [ -n "$model" ]; then
+    parts=$(printf "\033[32m%s\033[0m" "$model")
+    if [ -n "$loc" ] || [ -n "$ctx" ] || [ -n "$cost" ] || [ -n "$sty" ]; then
+        parts="${parts} \033[2m•\033[0m"
+    fi
+fi
+
+# Add location
+if [ -n "$loc" ]; then
+    parts="${parts} ${loc}"
+fi
+
+# Add remaining parts
+parts="${parts}${ctx}${cost}${sty}"
+
+# Output with left-aligned prefix indicator (Claude brand starburst)
+printf "✴️%s\n" "$parts"