install.sh

#!/usr/bin/env bash
# install.sh — Install Claude Code rules, agents, and skills.
#
# Usage:
#   ./install.sh <language> [<language> ...]
#   ./install.sh --all
#
# Examples:
#   ./install.sh golang
#   ./install.sh golang java terraform
#   ./install.sh --all
#
# Installs to ~/.claude/:
#   - rules/common/   (always)
#   - rules/<lang>/   (per requested language, or all with --all)
#   - agents/         (always)
#   - skills/         (always, preserving subdirectory structure)

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
RULES_DIR="$SCRIPT_DIR/rules"
AGENTS_DIR="$SCRIPT_DIR/agents"
SKILLS_DIR="$SCRIPT_DIR/skills"

# Collect available languages (subdirs of rules/ excluding common)
available_languages=()
for dir in "$RULES_DIR"/*/; do
    name="$(basename "$dir")"
    [[ "$name" == "common" ]] && continue
    available_languages+=("$name")
done

# --- Parse arguments ---
ALL=false
LANGUAGES=()

for arg in "$@"; do
    if [[ "$arg" == "--all" ]]; then
        ALL=true
    else
        LANGUAGES+=("$arg")
    fi
done

if [[ "$ALL" == true ]]; then
    LANGUAGES=("${available_languages[@]}")
fi

# --- Usage ---
if [[ ${#LANGUAGES[@]} -eq 0 ]]; then
    echo "Usage: $0 <language> [<language> ...] [--all]"
    echo ""
    echo "Available languages:"
    for lang in "${available_languages[@]}"; do
        echo "  - $lang"
    done
    exit 1
fi

DEST_DIR="$HOME/.claude/rules"

# Warn if destination already exists (user may have local customizations)
if [[ -d "$DEST_DIR" ]] && [[ "$(ls -A "$DEST_DIR" 2>/dev/null)" ]]; then
    echo "Note: $DEST_DIR/ already exists. Existing files will be overwritten."
    echo "      Back up any local customizations before proceeding."
fi

# --- Install common rules ---
echo "Installing common rules -> $DEST_DIR/common/"
mkdir -p "$DEST_DIR/common"
cp -r "$RULES_DIR/common/." "$DEST_DIR/common/"

# --- Install each requested language ---
for lang in "${LANGUAGES[@]}"; do
    # Validate language name to prevent path traversal
    if [[ ! "$lang" =~ ^[a-zA-Z0-9_-]+$ ]]; then
        echo "Error: invalid language name '$lang'. Only alphanumeric, dash, and underscore allowed." >&2
        continue
    fi
    lang_dir="$RULES_DIR/$lang"
    if [[ ! -d "$lang_dir" ]]; then
        echo "Warning: rules/$lang/ does not exist, skipping." >&2
        continue
    fi
    echo "Installing $lang rules -> $DEST_DIR/$lang/"
    mkdir -p "$DEST_DIR/$lang"
    cp -r "$lang_dir/." "$DEST_DIR/$lang/"
done

# --- Install agents ---
AGENTS_DEST="$HOME/.claude/agents"
echo "Installing agents -> $AGENTS_DEST/"
mkdir -p "$AGENTS_DEST"
cp "$AGENTS_DIR"/*.md "$AGENTS_DEST/"

# --- Install skills (preserve subdirectory structure) ---
SKILLS_DEST="$HOME/.claude/skills"
echo "Installing skills -> $SKILLS_DEST/"
for skill_dir in "$SKILLS_DIR"/*/; do
    skill_name="$(basename "$skill_dir")"
    mkdir -p "$SKILLS_DEST/$skill_name"
    cp "$skill_dir"SKILL.md "$SKILLS_DEST/$skill_name/"
done

echo "Done. Installed to ~/.claude/ (rules, agents, skills)."