mermaid-ascii installer for Claude Code

install.sh

#!/usr/bin/env bash
#
# mermaid-ascii Installer for Claude Code
# One-liner: curl -fsSL https://gist.githubusercontent.com/drunkhacker/GIST_ID/raw/install.sh | bash
#

set -euo pipefail

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

# GitHub Release URL
RELEASE_BASE="https://github.com/drunkhacker/mermaid-ascii/releases/download/v0.1.0-br-support"

# Installation directories
BIN_DIR="${HOME}/.local/bin"
SKILL_DIR="${HOME}/.claude/skills/mermaid-ascii"

info() { echo -e "${BLUE}[INFO]${NC} $1"; }
success() { echo -e "${GREEN}[OK]${NC} $1"; }
warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
error() { echo -e "${RED}[ERROR]${NC} $1"; exit 1; }

# Detect OS
detect_os() {
    case "$(uname -s)" in
        Linux*)  echo "Linux" ;;
        Darwin*) echo "Darwin" ;;
        MINGW*|MSYS*|CYGWIN*) echo "Windows" ;;
        *) error "Unsupported OS: $(uname -s)" ;;
    esac
}

# Detect architecture
detect_arch() {
    case "$(uname -m)" in
        x86_64|amd64) echo "x86_64" ;;
        arm64|aarch64) echo "arm64" ;;
        i386|i686) echo "i386" ;;
        *) error "Unsupported architecture: $(uname -m)" ;;
    esac
}

# Get the download filename based on OS and architecture
get_filename() {
    local os=$1
    local arch=$2

    case "${os}" in
        Linux|Darwin)
            echo "mermaid-ascii_${os}_${arch}.tar.gz"
            ;;
        Windows)
            echo "mermaid-ascii_${os}_${arch}.zip"
            ;;
    esac
}

# Install binary
install_binary() {
    local os=$1
    local arch=$2
    local filename
    filename=$(get_filename "$os" "$arch")
    local url="${RELEASE_BASE}/${filename}"
    local tmpdir
    tmpdir=$(mktemp -d)

    info "Downloading mermaid-ascii for ${os}/${arch}..."

    if command -v curl &> /dev/null; then
        curl -fsSL "$url" -o "${tmpdir}/${filename}"
    elif command -v wget &> /dev/null; then
        wget -q "$url" -O "${tmpdir}/${filename}"
    else
        error "Neither curl nor wget found. Please install one of them."
    fi

    info "Extracting..."
    cd "$tmpdir"

    if [[ "$filename" == *.tar.gz ]]; then
        tar -xzf "$filename"
    elif [[ "$filename" == *.zip ]]; then
        unzip -q "$filename"
    fi

    # Create bin directory if it doesn't exist
    mkdir -p "$BIN_DIR"

    # Find and install the binary
    local binary_name="mermaid-ascii"
    [[ "$os" == "windows" ]] && binary_name="mermaid-ascii.exe"

    if [[ -f "$binary_name" ]]; then
        mv "$binary_name" "${BIN_DIR}/"
        chmod +x "${BIN_DIR}/${binary_name}"
    else
        error "Binary not found in archive"
    fi

    # Cleanup
    cd - > /dev/null
    rm -rf "$tmpdir"

    success "Binary installed to ${BIN_DIR}/mermaid-ascii"
}

# Install skill file
install_skill() {
    info "Installing Claude Code skill..."

    mkdir -p "$SKILL_DIR"

    cat > "${SKILL_DIR}/SKILL.md" << 'SKILL_EOF'
---
name: mermaid-ascii
description: Render Mermaid diagrams as ASCII art in terminal
---

# Mermaid ASCII Rendering

When the user provides a Mermaid diagram, **immediately render it using `mermaid-ascii` and show ONLY the output**. Do NOT explain, interpret, or analyze the diagram - just show the rendered ASCII result.

## Instructions

1. Take the mermaid code exactly as provided
2. Run: `echo '<mermaid-code>' | mermaid-ascii -f -`
3. Display the output directly - no commentary before or after

## Options (use only if requested)

- `-a, --ascii` - Pure ASCII mode (no Unicode)
- `-x, --paddingX <n>` - Horizontal spacing (default: 5)
- `-y, --paddingY <n>` - Vertical spacing (default: 5)

## Example

User provides:
```
graph LR
    A[Start] --> B[End]
```

You run the command and show ONLY the ASCII output. No explanation needed.
SKILL_EOF

    success "Skill installed to ${SKILL_DIR}/SKILL.md"
}

# Check if PATH includes BIN_DIR
check_path() {
    if [[ ":$PATH:" != *":${BIN_DIR}:"* ]]; then
        warn "${BIN_DIR} is not in your PATH"
        echo ""
        echo "Add the following line to your shell profile (~/.bashrc, ~/.zshrc, etc.):"
        echo ""
        echo -e "  ${YELLOW}export PATH=\"\$HOME/.local/bin:\$PATH\"${NC}"
        echo ""
        echo "Then restart your shell or run: source ~/.bashrc (or ~/.zshrc)"
    fi
}

# Main
main() {
    echo ""
    echo "======================================"
    echo "  mermaid-ascii Installer"
    echo "  for Claude Code"
    echo "======================================"
    echo ""

    local os arch
    os=$(detect_os)
    arch=$(detect_arch)

    info "Detected: ${os}/${arch}"

    install_binary "$os" "$arch"
    install_skill

    echo ""
    check_path

    echo ""
    echo "======================================"
    success "Installation complete!"
    echo "======================================"
    echo ""
    echo "Verify installation:"
    echo "  mermaid-ascii --help"
    echo ""
    echo "Use in Claude Code:"
    echo "  The /mermaid-ascii skill is now available"
    echo ""
}

main "$@"