Add Go implementation with streaming responses and rename to prompt

- Implement streaming API responses for real-time text output
- Add multi-location config file support (.env, ~/.config/prompt/config, ~/.prompt.env)
- Rename project from anthropic-cli to prompt
- Add interactive conversation loop to bash script
- Create README with installation and usage instructions

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,2 @@
+ANTHROPIC_API_KEY=""
+SYSTEM_PROMPT=""

README.md

@@ -0,0 +1,101 @@
+# prompt
+
+A simple, fast CLI tool for chatting with Claude using the Anthropic API with real-time streaming responses.
+
+## Features
+
+- Interactive chat with Claude in your terminal
+- Real-time streaming responses (see text as Claude types)
+- Maintains conversation history within a session
+- Configurable model and system prompts
+- Multi-location config file support
+
+## Requirements
+
+- Go 1.21 or higher
+- Anthropic API key ([get one here](https://console.anthropic.com/))
+
+## Installation
+
+1. Clone and build:
+```bash
+git clone <your-repo-url>
+cd anthropic-cli
+go build -o prompt
+```
+
+2. Create a symlink for global access:
+```bash
+sudo ln -s $(pwd)/prompt /usr/local/bin/prompt
+```
+
+Or install via Go:
+```bash
+go install
+```
+
+## Configuration
+
+The tool looks for configuration files in the following order:
+1. `.env` in the current directory (for project-specific configs)
+2. `~/.config/prompt/config` (XDG standard location)
+3. `~/.prompt.env` (home directory)
+
+### Setup your config:
+
+```bash
+# Create the config directory
+mkdir -p ~/.config/prompt
+
+# Create config file
+cat > ~/.config/prompt/config << EOF
+ANTHROPIC_API_KEY=your-api-key-here
+MODEL=claude-sonnet-4-5-20250929
+SYSTEM_PROMPT=
+EOF
+```
+
+### Configuration options:
+
+- `ANTHROPIC_API_KEY` (required): Your Anthropic API key
+- `MODEL` (optional): Model to use (default: claude-sonnet-4-5-20250929)
+- `SYSTEM_PROMPT` (optional): Custom system prompt for Claude
+
+## Usage
+
+Start a conversation:
+```bash
+prompt "Hello, how are you?"
+```
+
+This will:
+1. Send your initial message to Claude
+2. Stream the response in real-time
+3. Enter an interactive chat mode where you can continue the conversation
+
+Type `exit` or `quit` to end the conversation.
+
+## Examples
+
+```bash
+# Ask a quick question
+prompt "What is the capital of France?"
+
+# Start a coding session
+prompt "Help me write a Python function to calculate fibonacci numbers"
+
+# Use a different model (set in config)
+# Edit your config file and change MODEL=claude-opus-4-5-20251101
+prompt "Explain quantum computing"
+```
+
+## Development
+
+Run without building:
+```bash
+go run main.go "your message here"
+```
+
+## License
+
+MIT

go.mod

@@ -0,0 +1,5 @@
+module prompt
+
+go 1.21
+
+require github.com/joho/godotenv v1.5.1

go.sum

@@ -0,0 +1,2 @@
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=

main.go

@@ -0,0 +1,265 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/joho/godotenv"
+)
+
+type Message struct {
+	Role    string `json:"role"`
+	Content string `json:"content"`
+}
+
+type APIRequest struct {
+	Model      string    `json:"model"`
+	System     string    `json:"system,omitempty"`
+	MaxTokens  int       `json:"max_tokens"`
+	Messages   []Message `json:"messages"`
+	Stream     bool      `json:"stream"`
+}
+
+type ContentBlock struct {
+	Text string `json:"text"`
+	Type string `json:"type"`
+}
+
+type APIResponse struct {
+	Content []ContentBlock `json:"content"`
+	Error   *struct {
+		Type    string `json:"type"`
+		Message string `json:"message"`
+	} `json:"error,omitempty"`
+}
+
+type StreamEvent struct {
+	Type  string          `json:"type"`
+	Delta *StreamDelta    `json:"delta,omitempty"`
+	Error *StreamError    `json:"error,omitempty"`
+}
+
+type StreamDelta struct {
+	Type string `json:"type"`
+	Text string `json:"text"`
+}
+
+type StreamError struct {
+	Type    string `json:"type"`
+	Message string `json:"message"`
+}
+
+var conversationHistory []Message
+
+func loadConfig() error {
+	// Try loading config from multiple locations in order
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return fmt.Errorf("failed to get home directory: %w", err)
+	}
+
+	configPaths := []string{
+		".env",                                      // Current directory
+		filepath.Join(homeDir, ".config", "prompt", "config"), // XDG standard
+		filepath.Join(homeDir, ".prompt.env"),       // Home directory
+	}
+
+	var lastErr error
+	for _, path := range configPaths {
+		err := godotenv.Load(path)
+		if err == nil {
+			return nil // Successfully loaded
+		}
+		lastErr = err
+	}
+
+	return lastErr
+}
+
+func main() {
+	// Load config file
+	err := loadConfig()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Warning: Could not load config file: %v\n", err)
+	}
+
+	// Get configuration from environment
+	apiKey := os.Getenv("ANTHROPIC_API_KEY")
+	if apiKey == "" {
+		fmt.Fprintln(os.Stderr, "Error: ANTHROPIC_API_KEY not set in .env file")
+		os.Exit(1)
+	}
+
+	model := os.Getenv("MODEL")
+	if model == "" {
+		model = "claude-sonnet-4-5-20250929"
+	}
+
+	systemPrompt := os.Getenv("SYSTEM_PROMPT")
+
+	// Get initial prompt from command-line arguments
+	if len(os.Args) < 2 {
+		fmt.Fprintln(os.Stderr, "Usage: prompt <your prompt>")
+		os.Exit(1)
+	}
+
+	initialPrompt := strings.Join(os.Args[1:], " ")
+
+	// Add initial user message to conversation history
+	conversationHistory = append(conversationHistory, Message{
+		Role:    "user",
+		Content: initialPrompt,
+	})
+
+	// Send initial message
+	response, err := sendMessage(apiKey, model, systemPrompt)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Println(response)
+
+	// Add assistant's response to conversation history
+	conversationHistory = append(conversationHistory, Message{
+		Role:    "assistant",
+		Content: response,
+	})
+
+	// Interactive conversation loop
+	reader := bufio.NewReader(os.Stdin)
+	for {
+		fmt.Println()
+		fmt.Print("\033[32mYou (or 'exit' to quit): \033[0m")
+
+		userInput, err := reader.ReadString('\n')
+		if err != nil {
+			break
+		}
+
+		userInput = strings.TrimSpace(userInput)
+
+		// Check if user wants to exit
+		if userInput == "exit" || userInput == "quit" || userInput == "" {
+			fmt.Println("Goodbye!")
+			break
+		}
+
+		// Add user input to conversation history
+		conversationHistory = append(conversationHistory, Message{
+			Role:    "user",
+			Content: userInput,
+		})
+
+		// Send message and get response
+		response, err := sendMessage(apiKey, model, systemPrompt)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			continue
+		}
+
+		fmt.Println(response)
+
+		// Add assistant's response to conversation history
+		conversationHistory = append(conversationHistory, Message{
+			Role:    "assistant",
+			Content: response,
+		})
+	}
+}
+
+func sendMessage(apiKey, model, systemPrompt string) (string, error) {
+	// Build API request with streaming enabled
+	request := APIRequest{
+		Model:     model,
+		System:    systemPrompt,
+		MaxTokens: 2048,
+		Messages:  conversationHistory,
+		Stream:    true,
+	}
+
+	jsonData, err := json.Marshal(request)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	// Make API call
+	req, err := http.NewRequest("POST", "https://api.anthropic.com/v1/messages", bytes.NewBuffer(jsonData))
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("x-api-key", apiKey)
+	req.Header.Set("anthropic-version", "2023-06-01")
+	req.Header.Set("content-type", "application/json")
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	// Check for HTTP errors
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return "", fmt.Errorf("API error (status %d): %s", resp.StatusCode, string(body))
+	}
+
+	// Read and parse streaming response
+	var fullResponse strings.Builder
+	reader := bufio.NewReader(resp.Body)
+
+	for {
+		line, err := reader.ReadString('\n')
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return "", fmt.Errorf("failed to read stream: %w", err)
+		}
+
+		line = strings.TrimSpace(line)
+
+		// Skip empty lines and non-data lines
+		if line == "" || !strings.HasPrefix(line, "data: ") {
+			continue
+		}
+
+		// Extract JSON data
+		data := strings.TrimPrefix(line, "data: ")
+
+		// Skip the [DONE] message
+		if data == "[DONE]" {
+			break
+		}
+
+		// Parse the event
+		var event StreamEvent
+		if err := json.Unmarshal([]byte(data), &event); err != nil {
+			continue // Skip malformed events
+		}
+
+		// Check for errors
+		if event.Error != nil {
+			return "", fmt.Errorf("API error: %s - %s", event.Error.Type, event.Error.Message)
+		}
+
+		// Print text deltas as they arrive
+		if event.Type == "content_block_delta" && event.Delta != nil && event.Delta.Type == "text_delta" {
+			fmt.Print(event.Delta.Text)
+			fullResponse.WriteString(event.Delta.Text)
+		}
+	}
+
+	fmt.Println() // Add newline after streaming response
+
+	return fullResponse.String(), nil
+}

main.sh

@@ -4,19 +4,58 @@ source .env
 
 PROMPT="$*"
 TEMP_FILE=$(mktemp)
-prompt=$(echo $PROMPT)
 ANTHROPIC_MODEL=${MODEL:-"claude-sonnet-4-5-20250929"}
 SYSTEM_PROMPT=${SYSTEM_PROMPT:-""}
 
+# Initialize conversation history array
+declare -a CONVERSATION_HISTORY=()
+
+# Function to build messages JSON array from conversation history
+build_messages_json() {
+    local messages_json="["
+    local first=true
+
+    for ((i=0; i<${#CONVERSATION_HISTORY[@]}; i+=2)); do
+        if [ "$first" = true ]; then
+            first=false
+        else
+            messages_json+=","
+        fi
+
+        # Add user message
+        local user_msg="${CONVERSATION_HISTORY[$i]}"
+        user_msg="${user_msg//\\/\\\\}"  # Escape backslashes
+        user_msg="${user_msg//\"/\\\"}"  # Escape quotes
+        user_msg="${user_msg//$'\n'/\\n}"  # Escape newlines
+        messages_json+="{\"role\":\"user\",\"content\":\"$user_msg\"}"
+
+        # Add assistant message if it exists
+        if [ $((i+1)) -lt ${#CONVERSATION_HISTORY[@]} ]; then
+            local assistant_msg="${CONVERSATION_HISTORY[$((i+1))]}"
+            assistant_msg="${assistant_msg//\\/\\\\}"
+            assistant_msg="${assistant_msg//\"/\\\"}"
+            assistant_msg="${assistant_msg//$'\n'/\\n}"
+            messages_json+=",{\"role\":\"assistant\",\"content\":\"$assistant_msg\"}"
+        fi
+    done
+
+    messages_json+="]"
+    echo "$messages_json"
+}
+
+# Function to send message and get response
+send_message() {
+    local messages_json=$(build_messages_json)
+
     JSON_PAYLOAD=$(jq -n \
         --arg model "$ANTHROPIC_MODEL" \
-  --arg prompt "$PROMPT" \
         --arg system_prompt "$SYSTEM_PROMPT" \
+        --argjson messages "$messages_json" \
         '{
             model: $model,
             system: $system_prompt,
             max_tokens: 2048,
-    messages: [{role: "user", content: $prompt}]
+            messages: $messages
         }')
 
     # Show loading message
@@ -31,5 +70,38 @@ curl -s https://api.anthropic.com/v1/messages \
     # Clear loading message
     echo -ne "\r\033[K"
 
-# Display response
+    # Extract and display response
-jq -r '.content[0].text' "$TEMP_FILE"
+    local response=$(jq -r '.content[0].text' "$TEMP_FILE")
+    echo "$response"
+
+    # Add assistant's response to conversation history
+    CONVERSATION_HISTORY+=("$response")
+}
+
+# Add initial user prompt to conversation history
+CONVERSATION_HISTORY+=("$PROMPT")
+
+# Send initial message
+send_message
+
+# Conversation loop
+while true; do
+    echo ""
+    echo -ne "\033[32mYou (or 'exit' to quit): \033[0m"
+    read -e user_input
+
+    # Check if user wants to exit
+    if [[ "$user_input" == "exit" ]] || [[ "$user_input" == "quit" ]] || [[ -z "$user_input" ]]; then
+        echo "Goodbye!"
+        break
+    fi
+
+    # Add user input to conversation history
+    CONVERSATION_HISTORY+=("$user_input")
+
+    # Send message and get response
+    send_message
+done
+
+# Cleanup
+rm -f "$TEMP_FILE"