feat: Allow starting CLI without initial prompt (#2)

Make the initial prompt optional. When no arguments are provided,
the CLI now goes directly to interactive mode instead of exiting.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

.env.example

@@ -1,2 +1,4 @@
 ANTHROPIC_API_KEY=""
 SYSTEM_PROMPT=""
+KLOD_LOGS=false
+KLOD_LOG_FILE=""

.gitignore

@@ -1 +1,2 @@
 .env
+klod

README.md

@@ -1,14 +1,15 @@
-# klod
+# Klod
 
-A simple, fast CLI tool for chatting with Claude using the Anthropic API with real-time streaming responses.
+Klod (pronounced \klod\\), a simple Go-based CLI tool for interacting with the Anthropic API
+
+## Motivation
+
+Sometimes you just need to quickly check/ask an LLM something. I basically live in the terminal so I want to avoid the context switch to a browser. Claude code on the other hand is a bit too eager to help (which has its benefits but no necessarily for your quick short messages). Therefore I quickly stiched together klod, originally in bash, still living as [./main.sh](main.sh) at the root of the project.
 
 ## 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
 
@@ -18,18 +19,21 @@ A simple, fast CLI tool for chatting with Claude using the Anthropic API with re
 ## Installation
 
 1. Clone and build:
+
 ```bash
-git clone <your-repo-url>
+git clone https://github.com/leoalho/klod.git
 cd anthropic-cli
-go build -o klod
+go build
 ```
 
 2. Create a symlink for global access:
+
 ```bash
 sudo ln -s $(pwd)/klod /usr/local/bin/klod
 ```
 
 Or install via Go:
+
 ```bash
 go install
 ```
@@ -37,6 +41,7 @@ go install
 ## Configuration
 
 The tool looks for configuration files in the following order:
+
 1. `~/.config/klod/config` (XDG standard location)
 2. `~/.klod.env` (home directory)
 3. `.env` in the current directory (for project-specific overrides)
@@ -52,6 +57,8 @@ cat > ~/.config/klod/config << EOF
 ANTHROPIC_API_KEY=your-api-key-here
 MODEL=claude-sonnet-4-5-20250929
 SYSTEM_PROMPT=
+KLOD_LOGS=false
+KLOD_LOG_FILE=
 EOF
 ```
 
@@ -60,42 +67,29 @@ EOF
 - `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
+- `KLOD_LOGS` (optional): Enable conversation logging (default: false, set to "true" or "1" to enable)
+- `KLOD_LOG_FILE` (optional): Custom log file path (default: `$XDG_STATE_HOME/klod/conversations.log` or `~/.local/state/klod/conversations.log`)
 
 ## Usage
 
 Start a conversation:
+
 ```bash
-klod "Hello, how are you?"
+klod 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
-klod "What is the capital of France?"
-
-# Start a coding session
-klod "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
-klod "Explain quantum computing"
-```
-
 ## Development
 
 Run without building:
+
 ```bash
-go run main.go "your message here"
+go run main.go your message here
 ```
-
-## License
-
-MIT

main.go

@@ -10,6 +10,9 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"syscall"
+	"time"
+	"unsafe"
 
 	"github.com/joho/godotenv"
 )
@@ -20,11 +23,11 @@ type Message struct {
 }
 
 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"`
+	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 {
@@ -41,9 +44,9 @@ type APIResponse struct {
 }
 
 type StreamEvent struct {
-	Type  string          `json:"type"`
-	Delta *StreamDelta    `json:"delta,omitempty"`
-	Error *StreamError    `json:"error,omitempty"`
+	Type  string       `json:"type"`
+	Delta *StreamDelta `json:"delta,omitempty"`
+	Error *StreamError `json:"error,omitempty"`
 }
 
 type StreamDelta struct {
@@ -57,6 +60,62 @@ type StreamError struct {
 }
 
 var conversationHistory []Message
+var loggingEnabled bool
+var logFilePath string
+
+type winsize struct {
+	Row    uint16
+	Col    uint16
+	Xpixel uint16
+	Ypixel uint16
+}
+
+func getTerminalWidth() int {
+	ws := &winsize{}
+	retCode, _, _ := syscall.Syscall(syscall.SYS_IOCTL,
+		uintptr(syscall.Stdin),
+		uintptr(syscall.TIOCGWINSZ),
+		uintptr(unsafe.Pointer(ws)))
+
+	if int(retCode) == -1 {
+		return 80 // Default fallback
+	}
+	return int(ws.Col)
+}
+
+func printSeparator() {
+	width := getTerminalWidth()
+	fmt.Println(strings.Repeat("─", width))
+}
+
+func logConversation(message Message) error {
+	if !loggingEnabled {
+		return nil
+	}
+
+	// Ensure log directory exists
+	logDir := filepath.Dir(logFilePath)
+	if err := os.MkdirAll(logDir, 0755); err != nil {
+		return fmt.Errorf("failed to create log directory: %w", err)
+	}
+
+	// Open log file in append mode
+	file, err := os.OpenFile(logFilePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to open log file: %w", err)
+	}
+	defer file.Close()
+
+	// Write timestamp and message
+	timestamp := time.Now().Format("2006-01-02 15:04:05")
+	logEntry := fmt.Sprintf("[%s] %s: %s\n", timestamp, strings.ToUpper(message.Role), message.Content)
+
+	if _, err := file.WriteString(logEntry); err != nil {
+		return fmt.Errorf("failed to write to log file: %w", err)
+	}
+
+	return nil
+}
 
 func loadConfig() error {
 	// Try loading config from multiple locations in order
@@ -67,8 +126,8 @@ func loadConfig() error {
 
 	configPaths := []string{
 		filepath.Join(homeDir, ".config", "klod", "config"), // XDG standard
-		filepath.Join(homeDir, ".klod.env"),       // Home directory
-		".env",                                      // Current directory (for project-specific overrides)
+		filepath.Join(homeDir, ".klod.env"),                 // Home directory
+		".env",                                              // Current directory (for project-specific overrides)
 	}
 
 	var lastErr error
@@ -104,37 +163,55 @@ func main() {
 
 	systemPrompt := os.Getenv("SYSTEM_PROMPT")
 
-	// Get initial prompt from command-line arguments
-	if len(os.Args) < 2 {
-		fmt.Fprintln(os.Stderr, "Usage: klod <your prompt>")
-		os.Exit(1)
+	// Configure logging
+	loggingEnabled = os.Getenv("KLOD_LOGS") == "true" || os.Getenv("KLOD_LOGS") == "1"
+	logFilePath = os.Getenv("KLOD_LOG_FILE")
+	if logFilePath == "" {
+		// Use XDG_STATE_HOME or default to ~/.local/state per XDG spec
+		stateDir := os.Getenv("XDG_STATE_HOME")
+		if stateDir == "" {
+			homeDir, _ := os.UserHomeDir()
+			stateDir = filepath.Join(homeDir, ".local", "state")
+		}
+		// Create a unique log file for this session based on timestamp
+		sessionTime := time.Now().Format("2006-01-02_15-04-05")
+		logFilePath = filepath.Join(stateDir, "klod", "sessions", sessionTime+".log")
 	}
 
-	initialPrompt := strings.Join(os.Args[1:], " ")
+	// Get initial prompt from command-line arguments (if provided)
+	if len(os.Args) >= 2 {
+		initialPrompt := strings.Join(os.Args[1:], " ")
 
-	// Add initial user message to conversation history
-	conversationHistory = append(conversationHistory, Message{
-		Role:    "user",
-		Content: initialPrompt,
-	})
+		// Add initial user message to conversation history
+		userMsg := Message{
+			Role:    "user",
+			Content: initialPrompt,
+		}
+		conversationHistory = append(conversationHistory, userMsg)
+		logConversation(userMsg)
 
-	// Send initial message
-	response, err := sendMessage(apiKey, model, systemPrompt)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
-		os.Exit(1)
+		// Send initial message
+		printSeparator()
+		fmt.Print("\033[34mAssistant: \033[0m")
+		response, err := sendMessage(apiKey, model, systemPrompt)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			os.Exit(1)
+		}
+		printSeparator()
+
+		// Add assistant's response to conversation history
+		assistantMsg := Message{
+			Role:    "assistant",
+			Content: response,
+		}
+		conversationHistory = append(conversationHistory, assistantMsg)
+		logConversation(assistantMsg)
 	}
 
-	// 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')
@@ -151,23 +228,30 @@ func main() {
 		}
 
 		// Add user input to conversation history
-		conversationHistory = append(conversationHistory, Message{
+		userMsg := Message{
 			Role:    "user",
 			Content: userInput,
-		})
+		}
+		conversationHistory = append(conversationHistory, userMsg)
+		logConversation(userMsg)
 
 		// Send message and get response
+		printSeparator()
+		fmt.Print("\033[34mAssistant: \033[0m")
 		response, err := sendMessage(apiKey, model, systemPrompt)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 			continue
 		}
+		printSeparator()
 
 		// Add assistant's response to conversation history
-		conversationHistory = append(conversationHistory, Message{
+		assistantMsg := Message{
 			Role:    "assistant",
 			Content: response,
-		})
+		}
+		conversationHistory = append(conversationHistory, assistantMsg)
+		logConversation(assistantMsg)
 	}
 }