Add dir_tree tool

When the last message in the passed messages slice is an assistant
message, treat it as a partial message that is being continued, and
include its content in the newly created reply

Update TUI code to handle new behavior

go.mod

@@ -4,6 +4,8 @@ go 1.21
 
 require (
 	github.com/alecthomas/chroma/v2 v2.11.1
+	github.com/charmbracelet/bubbles v0.18.0
+	github.com/charmbracelet/bubbletea v0.25.0
 	github.com/charmbracelet/lipgloss v0.10.0
 	github.com/go-yaml/yaml v2.1.0+incompatible
 	github.com/sashabaranov/go-openai v1.17.7
@@ -14,7 +16,9 @@ require (
 )
 
 require (
+	github.com/atotto/clipboard v0.1.4 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/containerd/console v1.0.4-0.20230313162750-1ae8d489ac81 // indirect
 	github.com/dlclark/regexp2 v1.10.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
@@ -22,13 +26,19 @@ require (
 	github.com/kr/pretty v0.3.1 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-isatty v0.0.18 // indirect
+	github.com/mattn/go-localereader v0.0.1 // indirect
 	github.com/mattn/go-runewidth v0.0.15 // indirect
 	github.com/mattn/go-sqlite3 v1.14.18 // indirect
+	github.com/muesli/ansi v0.0.0-20211018074035-2e021307bc4b // indirect
+	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/reflow v0.3.0 // indirect
 	github.com/muesli/termenv v0.15.2 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/sync v0.1.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
+	golang.org/x/term v0.6.0 // indirect
+	golang.org/x/text v0.3.8 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v2 v2.2.2 // indirect
 )

go.sum

@@ -4,10 +4,18 @@ github.com/alecthomas/chroma/v2 v2.11.1 h1:m9uUtgcdAwgfFNxuqj7AIG75jD2YmL61BBIJW
 github.com/alecthomas/chroma/v2 v2.11.1/go.mod h1:4TQu7gdfuPjSh76j78ietmqh9LiurGF0EpseFXdKMBw=
 github.com/alecthomas/repr v0.2.0 h1:HAzS41CIzNW5syS8Mf9UwXhNH1J9aix/BvDRf1Ml2Yk=
 github.com/alecthomas/repr v0.2.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
+github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
+github.com/charmbracelet/bubbles v0.18.0 h1:PYv1A036luoBGroX6VWjQIE9Syf2Wby2oOl/39KLfy0=
+github.com/charmbracelet/bubbles v0.18.0/go.mod h1:08qhZhtIwzgrtBjAcJnij1t1H0ZRjwHyGsy6AL11PSw=
+github.com/charmbracelet/bubbletea v0.25.0 h1:bAfwk7jRz7FKFl9RzlIULPkStffg5k6pNt5dywy4TcM=
+github.com/charmbracelet/bubbletea v0.25.0/go.mod h1:EN3QDR1T5ZdWmdfDzYcqOCAps45+QIJbLOBxmVNWNNg=
 github.com/charmbracelet/lipgloss v0.10.0 h1:KWeXFSexGcfahHX+54URiZGkBFazf70JNMtwg/AFW3s=
 github.com/charmbracelet/lipgloss v0.10.0/go.mod h1:Wig9DSfvANsxqkRsqj6x87irdy123SR4dOXlKa91ciE=
+github.com/containerd/console v1.0.4-0.20230313162750-1ae8d489ac81 h1:q2hJAaP1k2wIvVRd/hEHD7lacgqrCPS+k8g1MndzfWY=
+github.com/containerd/console v1.0.4-0.20230313162750-1ae8d489ac81/go.mod h1:YynlIjWYF8myEu6sdkwKIvGQq+cOckRm6So2avqoYAk=
 github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/dlclark/regexp2 v1.10.0 h1:+/GIL799phkJqYW+3YbOd8LCcbHzT0Pbo8zl70MHsq0=
@@ -30,11 +38,17 @@ github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69
 github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.18 h1:DOKFKCQ7FNG2L1rbrmstDN4QVRdS89Nkh85u68Uwp98=
 github.com/mattn/go-isatty v0.0.18/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-localereader v0.0.1 h1:ygSAOl7ZXTx4RdPYinUpg6W99U8jWvWi9Ye2JC/oIi4=
+github.com/mattn/go-localereader v0.0.1/go.mod h1:8fBrzywKY7BI3czFoHkuzRoWE9C+EiG4R1k4Cjx5p88=
 github.com/mattn/go-runewidth v0.0.12/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
 github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
 github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mattn/go-sqlite3 v1.14.18 h1:JL0eqdCOq6DJVNPSvArO/bIV9/P7fbGrV00LZHc+5aI=
 github.com/mattn/go-sqlite3 v1.14.18/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
+github.com/muesli/ansi v0.0.0-20211018074035-2e021307bc4b h1:1XF24mVaiu7u+CFywTdcDo2ie1pzzhwjt6RHqzpMU34=
+github.com/muesli/ansi v0.0.0-20211018074035-2e021307bc4b/go.mod h1:fQuZ0gauxyBcmsdE3ZT4NasjaRdxmbCS0jRHsrWu3Ho=
+github.com/muesli/cancelreader v0.2.2 h1:3I4Kt4BQjOR54NavqnDogx/MIoWBFa0StPA8ELUXHmA=
+github.com/muesli/cancelreader v0.2.2/go.mod h1:3XuTXfFS2VjM+HTLZY9Ak0l6eUKfijIfMUZ4EgX0QYo=
 github.com/muesli/reflow v0.3.0 h1:IFsN6K9NfGtjeggFP+68I4chLZV2yIKsXJFNZ+eWh6s=
 github.com/muesli/reflow v0.3.0/go.mod h1:pbwTDkVPibjO2kyvBQRBxTWEEGDGq0FlB1BIKtnHY/8=
 github.com/muesli/termenv v0.15.2 h1:GohcuySI0QmI3wN8Ok9PtKGkgkFIk7y6Vpb5PvrY+Wo=
@@ -55,9 +69,16 @@ github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/sqids/sqids-go v0.4.1 h1:eQKYzmAZbLlRwHeHYPF35QhgxwZHLnlmVj9AkIj/rrw=
 github.com/sqids/sqids-go v0.4.1/go.mod h1:EMwHuPQgSNFS0A49jESTfIQS+066XQTVhukrzEPScl8=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
 golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.6.0 h1:clScbb1cHjoCkyRbWwBEUZ5H/tIFu5TAXIqaZD0Gcjw=
+golang.org/x/term v0.6.0/go.mod h1:m6U89DPEgQRMq3DNkDClhWw02AUbt2daBVO4cn4Hv9U=
+golang.org/x/text v0.3.8 h1:nAL+RVCQ9uMn3vJZbV+MRnydTJFPf8qqY42YiA6MrqY=
+golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

pkg/cmd/chat.go

@@ -0,0 +1,37 @@
+package cmd
+
+import (
+	"fmt"
+
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
+	"git.mlow.ca/mlow/lmcli/pkg/tui"
+	"github.com/spf13/cobra"
+)
+
+func ChatCmd(ctx *lmcli.Context) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "chat [conversation]",
+		Short: "Open the chat interface",
+		Long:  `Open the chat interface, optionally on a given conversation.`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			// TODO: implement jump-to-conversation logic
+			shortname := ""
+			if len(args) == 1 {
+				shortname = args[0]
+			}
+			err := tui.Launch(ctx, shortname)
+			if err != nil {
+				return fmt.Errorf("Error fetching LLM response: %v", err)
+			}
+			return nil
+		},
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			compMode := cobra.ShellCompDirectiveNoFileComp
+			if len(args) != 0 {
+				return nil, compMode
+			}
+			return ctx.Store.ConversationShortNameCompletions(toComplete), compMode
+		},
+	}
+	return cmd
+}

pkg/cmd/cmd.go

@@ -23,6 +23,7 @@ func RootCmd(ctx *lmcli.Context) *cobra.Command {
 		},
 	}
 
+	chatCmd := ChatCmd(ctx)
 	continueCmd := ContinueCmd(ctx)
 	cloneCmd := CloneCmd(ctx)
 	editCmd := EditCmd(ctx)
@@ -48,6 +49,7 @@ func RootCmd(ctx *lmcli.Context) *cobra.Command {
 	}
 
 	root.AddCommand(
+		chatCmd,
 		cloneCmd,
 		continueCmd,
 		editCmd,

pkg/cmd/util/util.go

@@ -118,11 +118,18 @@ func HandleConversationReply(ctx *lmcli.Context, c *model.Conversation, persist
 func FormatForExternalPrompt(messages []model.Message, system bool) string {
 	sb := strings.Builder{}
 	for _, message := range messages {
-		if message.Role != model.MessageRoleUser && (message.Role != model.MessageRoleSystem || !system) {
+		if message.Content == "" {
 			continue
 		}
-		sb.WriteString(fmt.Sprintf("<%s>\n", message.Role.FriendlyRole()))
+		switch message.Role {
-		sb.WriteString(fmt.Sprintf("\"\"\"\n%s\n\"\"\"\n\n", message.Content))
+		case model.MessageRoleAssistant, model.MessageRoleToolCall:
+			sb.WriteString("Assistant:\n\n")
+		case model.MessageRoleUser:
+			sb.WriteString("User:\n\n")
+		default:
+			continue
+		}
+		sb.WriteString(fmt.Sprintf("%s", lipgloss.NewStyle().PaddingLeft(1).Render(message.Content)))
 	}
 	return sb.String()
 }
@@ -133,13 +140,32 @@ func GenerateTitle(ctx *lmcli.Context, c *model.Conversation) (string, error) {
 		return "", err
 	}
 
-	const header = "Generate a concise 4-5 word title for the conversation below."
+	const prompt = `Above is an excerpt from a conversation between a user and AI assistant. Please reply with a short title (no more than 8 words) that reflects the topic of the conversation, read from the user's perspective.
-	prompt := fmt.Sprintf("%s\n\n---\n\n%s", header, FormatForExternalPrompt(messages, false))
+
+Example conversation:
+
+"""
+User:
+
+  Hello!
+
+Assistant:
+
+  Hello! How may I assist you?
+"""
+
+Example response:
+
+"""
+Title: A brief introduction
+"""
+`
+	conversation := FormatForExternalPrompt(messages, false)
 
 	generateRequest := []model.Message{
 		{
 			Role:    model.MessageRoleUser,
-			Content: prompt,
+			Content: fmt.Sprintf("\"\"\"\n%s\n\"\"\"\n\n%s", conversation, prompt),
 		},
 	}
 
@@ -158,12 +184,15 @@ func GenerateTitle(ctx *lmcli.Context, c *model.Conversation) (string, error) {
 		return "", err
 	}
 
+	response = strings.TrimPrefix(response, "Title: ")
+	response = strings.Trim(response, "\"")
+
 	return response, nil
 }
 
 // ShowWaitAnimation prints an animated ellipses to stdout until something is
 // received on the signal channel. An empty string sent to the channel to
-// noftify the caller that the animation has completed (carriage returned).
+// notify the caller that the animation has completed (carriage returned).
 func ShowWaitAnimation(signal chan any) {
 	// Save the current cursor position
 	fmt.Print("\033[s")

pkg/lmcli/model/conversation.go

@@ -41,18 +41,28 @@ type RequestParameters struct {
 	ToolBag      []Tool
 }
 
+func (m *MessageRole) IsAssistant() bool {
+	switch *m {
+	case MessageRoleAssistant, MessageRoleToolCall:
+		return true
+	}
+	return false
+}
+
 // FriendlyRole returns a human friendly signifier for the message's role.
 func (m *MessageRole) FriendlyRole() string {
-	var friendlyRole string
 	switch *m {
 	case MessageRoleUser:
-		friendlyRole = "You"
+		return "You"
 	case MessageRoleSystem:
-		friendlyRole = "System"
+		return "System"
 	case MessageRoleAssistant:
-		friendlyRole = "Assistant"
+		return "Assistant"
+	case MessageRoleToolCall:
+		return "Tool Call"
+	case MessageRoleToolResult:
+		return "Tool Result"
 	default:
-		friendlyRole = string(*m)
+		return string(*m)
 	}
-	return friendlyRole
 }

pkg/lmcli/provider/anthropic/anthropic.go

@@ -46,6 +46,8 @@ type Response struct {
 	Type         string            `json:"type"`
 	Role         string            `json:"role"`
 	Content      []OriginalContent `json:"content"`
+	StopReason   string            `json:"stop_reason"`
+	StopSequence string            `json:"stop_sequence"`
 }
 
 const FUNCTION_STOP_SEQUENCE = "</function_calls>"
@@ -68,7 +70,7 @@ func buildRequest(params model.RequestParameters, messages []model.Message) Requ
 	startIdx := 0
 	if len(messages) > 0 && messages[0].Role == model.MessageRoleSystem {
 		requestBody.System = messages[0].Content
-		requestBody.Messages = requestBody.Messages[:len(messages)-1]
+		requestBody.Messages = requestBody.Messages[1:]
 		startIdx = 1
 	}
 
@@ -94,7 +96,11 @@ func buildRequest(params model.RequestParameters, messages []model.Message) Requ
 			if err != nil {
 				panic("Could not serialize []ToolCall to XMLFunctionCall")
 			}
-			message.Content += xmlString
+			if len(message.Content) > 0 {
+				message.Content += fmt.Sprintf("\n\n%s", xmlString)
+			} else {
+				message.Content = xmlString
+			}
 		case model.MessageRoleToolResult:
 			xmlFuncResults := convertToolResultsToXMLFunctionResult(msg.ToolResults)
 			xmlString, err := xmlFuncResults.XMLString()
@@ -143,6 +149,10 @@ func (c *AnthropicClient) CreateChatCompletion(
 	messages []model.Message,
 	callback provider.ReplyCallback,
 ) (string, error) {
+	if len(messages) == 0 {
+		return "", fmt.Errorf("Can't create completion from no messages")
+	}
+
 	request := buildRequest(params, messages)
 
 	resp, err := sendRequest(ctx, c, request)
@@ -158,6 +168,14 @@ func (c *AnthropicClient) CreateChatCompletion(
 	}
 
 	sb := strings.Builder{}
+
+	lastMessage := messages[len(messages)-1]
+	if lastMessage.Role.IsAssistant() {
+		// this is a continuation of a previous assistant reply, so we'll
+		// include its contents in the final result
+		sb.WriteString(lastMessage.Content)
+	}
+
 	for _, content := range response.Content {
 		var reply model.Message
 		switch content.Type {
@@ -185,6 +203,10 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 	callback provider.ReplyCallback,
 	output chan<- string,
 ) (string, error) {
+	if len(messages) == 0 {
+		return "", fmt.Errorf("Can't create completion from no messages")
+	}
+
 	request := buildRequest(params, messages)
 	request.Stream = true
 
@@ -194,9 +216,18 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 	}
 	defer resp.Body.Close()
 
-	scanner := bufio.NewScanner(resp.Body)
 	sb := strings.Builder{}
 
+	lastMessage := messages[len(messages)-1]
+	continuation := false
+	if messages[len(messages)-1].Role.IsAssistant() {
+		// this is a continuation of a previous assistant reply, so we'll
+		// include its contents in the final result
+		sb.WriteString(lastMessage.Content)
+		continuation = true
+	}
+
+	scanner := bufio.NewScanner(resp.Body)
 	for scanner.Scan() {
 		line := scanner.Text()
 		line = strings.TrimSpace(line)
@@ -271,24 +302,21 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 							return content, fmt.Errorf("reached </function_calls> stop sequence but no opening tag found")
 						}
 
-						funcCallXml := content[start:]
-						funcCallXml += FUNCTION_STOP_SEQUENCE
-
 						sb.WriteString(FUNCTION_STOP_SEQUENCE)
 						output <- FUNCTION_STOP_SEQUENCE
 
-						// Extract function calls
+						funcCallXml := content[start:] + FUNCTION_STOP_SEQUENCE
+
 						var functionCalls XMLFunctionCalls
-						err := xml.Unmarshal([]byte(sb.String()), &functionCalls)
+						err := xml.Unmarshal([]byte(funcCallXml), &functionCalls)
 						if err != nil {
 							return "", fmt.Errorf("failed to unmarshal function_calls: %v", err)
 						}
 
-						// Execute function calls
 						toolCall := model.Message{
 							Role: model.MessageRoleToolCall,
-							// xml stripped from content
+							// function call xml stripped from content for model interop
-							Content:   content[:start],
+							Content:   strings.TrimSpace(content[:start]),
 							ToolCalls: convertXMLFunctionCallsToToolCalls(functionCalls),
 						}
 
@@ -297,31 +325,36 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 							return "", err
 						}
 
-						toolReply := model.Message{
+						toolResult := model.Message{
 							Role:        model.MessageRoleToolResult,
 							ToolResults: toolResults,
 						}
 
 						if callback != nil {
 							callback(toolCall)
-							callback(toolReply)
+							callback(toolResult)
 						}
 
-						// Recurse into CreateChatCompletionStream with the tool call replies
+						if continuation {
-						// added to the original messages
+							messages[len(messages)-1] = toolCall
-						messages = append(append(messages, toolCall), toolReply)
+						} else {
+							messages = append(messages, toolCall)
+						}
+
+						messages = append(messages, toolResult)
 						return c.CreateChatCompletionStream(ctx, params, messages, callback, output)
 					}
 				}
 			case "message_stop":
 				// return the completed message
+				content := sb.String()
 				if callback != nil {
 					callback(model.Message{
 						Role:    model.MessageRoleAssistant,
-						Content: sb.String(),
+						Content: content,
 					})
 				}
-				return sb.String(), nil
+				return content, nil
 			case "error":
 				return sb.String(), fmt.Errorf("an error occurred: %s", event["error"])
 			default:

pkg/lmcli/provider/anthropic/tools.go

@@ -9,9 +9,10 @@ import (
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 )
 
-const TOOL_PREAMBLE = `In this environment you have access to a set of tools which may assist you in fulfilling user requests.
+const TOOL_PREAMBLE = `You have access to the following tools when replying.
 
 You may call them like this:
+
 <function_calls>
 <invoke>
 <tool_name>$TOOL_NAME</tool_name>
@@ -24,6 +25,14 @@ You may call them like this:
 
 Here are the tools available:`
 
+const TOOL_PREAMBLE_FOOTER = `Recognize the utility of these tools in a broad range of different applications, and the power they give you to solve a wide range of different problems. However, ensure that the tools are used judiciously and only when clearly relevant to the user's request. Specifically:
+
+1. Only use a tool if the user has explicitly requested or provided information that warrants its use. Do not make assumptions about files or data existing without the user mentioning them.
+
+2. If there is ambiguity about whether using a tool is appropriate, ask a clarifying question to the user before proceeding. Confirm your understanding of their request and intent.
+
+3. Prioritize providing direct responses and explanations based on your own knowledge and understanding. Use tools to supplement and enhance your responses when clearly applicable, but not as a default action.`
+
 type XMLTools struct {
 	XMLName          struct{}             `xml:"tools"`
 	ToolDescriptions []XMLToolDescription `xml:"tool_description"`
@@ -151,7 +160,7 @@ func buildToolsSystemPrompt(tools []model.Tool) string {
 	if err != nil {
 		panic("Could not serialize []model.Tool to XMLTools")
 	}
-	return TOOL_PREAMBLE + "\n" + xmlToolsString + "\n"
+	return TOOL_PREAMBLE + "\n\n" + xmlToolsString + "\n\n" + TOOL_PREAMBLE_FOOTER
 }
 
 func (x XMLTools) XMLString() (string, error) {

pkg/lmcli/provider/openai/openai.go

@@ -137,7 +137,15 @@ func handleToolCalls(
 	params model.RequestParameters,
 	content string,
 	toolCalls []openai.ToolCall,
+	callback provider.ReplyCallback,
+	messages []model.Message,
 ) ([]model.Message, error) {
+	lastMessage := messages[len(messages)-1]
+	continuation := false
+	if lastMessage.Role.IsAssistant() {
+		continuation = true
+	}
+
 	toolCall := model.Message{
 		Role:      model.MessageRoleToolCall,
 		Content:   content,
@@ -154,7 +162,19 @@ func handleToolCalls(
 		ToolResults: toolResults,
 	}
 
-	return []model.Message{toolCall, toolResult}, nil
+	if callback != nil {
+		callback(toolCall)
+		callback(toolResult)
+	}
+
+	if continuation {
+		messages[len(messages)-1] = toolCall
+	} else {
+		messages = append(messages, toolCall)
+	}
+	messages = append(messages, toolResult)
+
+	return messages, nil
 }
 
 func (c *OpenAIClient) CreateChatCompletion(
@@ -163,6 +183,10 @@ func (c *OpenAIClient) CreateChatCompletion(
 	messages []model.Message,
 	callback provider.ReplyCallback,
 ) (string, error) {
+	if len(messages) == 0 {
+		return "", fmt.Errorf("Can't create completion from no messages")
+	}
+
 	client := openai.NewClient(c.APIKey)
 	req := createChatCompletionRequest(c, params, messages)
 	resp, err := client.CreateChatCompletion(ctx, req)
@@ -172,41 +196,46 @@ func (c *OpenAIClient) CreateChatCompletion(
 
 	choice := resp.Choices[0]
 
-	toolCalls := choice.Message.ToolCalls
+	var content string
-	if len(toolCalls) > 0 {
+	lastMessage := messages[len(messages)-1]
-		results, err := handleToolCalls(params, choice.Message.Content, toolCalls)
+	if lastMessage.Role.IsAssistant() {
-		if err != nil {
+		content = lastMessage.Content + choice.Message.Content
-			return "", err
+	} else {
-		}
+		content = choice.Message.Content
-		if callback != nil {
+	}
-			for _, result := range results {
+
-				callback(result)
+	toolCalls := choice.Message.ToolCalls
-			}
+	if len(toolCalls) > 0 {
+		messages, err := handleToolCalls(params, content, toolCalls, callback, messages)
+		if err != nil {
+			return content, err
 		}
 
-		// Recurse into CreateChatCompletion with the tool call replies
-		messages = append(messages, results...)
 		return c.CreateChatCompletion(ctx, params, messages, callback)
 	}
 
 	if callback != nil {
 		callback(model.Message{
 			Role:    model.MessageRoleAssistant,
-			Content: choice.Message.Content,
+			Content: content,
 		})
 	}
 
 	// Return the user-facing message.
-	return choice.Message.Content, nil
+	return content, nil
 }
 
 func (c *OpenAIClient) CreateChatCompletionStream(
 	ctx context.Context,
 	params model.RequestParameters,
 	messages []model.Message,
-	callbback provider.ReplyCallback,
+	callback provider.ReplyCallback,
 	output chan<- string,
 ) (string, error) {
+	if len(messages) == 0 {
+		return "", fmt.Errorf("Can't create completion from no messages")
+	}
+
 	client := openai.NewClient(c.APIKey)
 	req := createChatCompletionRequest(c, params, messages)
 
@@ -219,6 +248,11 @@ func (c *OpenAIClient) CreateChatCompletionStream(
 	content := strings.Builder{}
 	toolCalls := []openai.ToolCall{}
 
+	lastMessage := messages[len(messages)-1]
+	if lastMessage.Role.IsAssistant() {
+		content.WriteString(lastMessage.Content)
+	}
+
 	// Iterate stream segments
 	for {
 		response, e := stream.Recv()
@@ -251,28 +285,21 @@ func (c *OpenAIClient) CreateChatCompletionStream(
 	}
 
 	if len(toolCalls) > 0 {
-		results, err := handleToolCalls(params, content.String(), toolCalls)
+		messages, err := handleToolCalls(params, content.String(), toolCalls, callback, messages)
 		if err != nil {
 			return content.String(), err
 		}
 
-		if callbback != nil {
-			for _, result := range results {
-				callbback(result)
-			}
-		}
-
 		// Recurse into CreateChatCompletionStream with the tool call replies
-		messages = append(messages, results...)
+		return c.CreateChatCompletionStream(ctx, params, messages, callback, output)
-		return c.CreateChatCompletionStream(ctx, params, messages, callbback, output)
+	} else {
-	}
+		if callback != nil {
-
+			callback(model.Message{
-	if callbback != nil {
-		callbback(model.Message{
 				Role:    model.MessageRoleAssistant,
 				Content: content.String(),
 			})
 		}
+	}
 
 	return content.String(), err
 }

pkg/lmcli/store.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"strings"
+	"time"
 
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	sqids "github.com/sqids/sqids-go"
@@ -26,6 +27,7 @@ type ConversationStore interface {
 	SaveMessage(message *model.Message) error
 	DeleteMessage(message *model.Message) error
 	UpdateMessage(message *model.Message) error
+	AddReply(conversation *model.Conversation, message model.Message) (*model.Message, error)
 }
 
 type SQLStore struct {
@@ -119,3 +121,12 @@ func (s *SQLStore) LastMessage(conversation *model.Conversation) (*model.Message
 	err := s.db.Where("conversation_id = ?", conversation.ID).Last(&message).Error
 	return &message, err
 }
+
+// AddReply adds the given messages as a reply to the given conversation, can be
+// used to easily copy a message associated with one conversation, to another
+func (s *SQLStore) AddReply(c *model.Conversation, m model.Message) (*model.Message, error) {
+	m.ConversationID = c.ID
+	m.ID = 0
+	m.CreatedAt = time.Time{}
+	return &m, s.SaveMessage(&m)
+}

pkg/lmcli/tools/dir_tree.go

@@ -0,0 +1,143 @@
+package tools
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	toolutil "git.mlow.ca/mlow/lmcli/pkg/lmcli/tools/util"
+)
+
+const TREE_DESCRIPTION = `Retrieve a tree view of a directory's contents.
+
+Example result:
+{
+	"message": "success",
+	"result": ".
+├── a_directory/
+│   ├── file1.txt (100 bytes)
+│   └── file2.txt (200 bytes)
+├── a_file.txt (123 bytes)
+└── another_file.txt (456 bytes)"
+}
+`
+
+var DirTreeTool = model.Tool{
+	Name:        "dir_tree",
+	Description: TREE_DESCRIPTION,
+	Parameters: []model.ToolParameter{
+		{
+			Name:        "relative_path",
+			Type:        "string",
+			Description: "If set, display the tree starting from this path relative to the current one.",
+		},
+		{
+			Name:        "max_depth",
+			Type:        "integer",
+			Description: "Maximum depth of recursion. Default is unlimited.",
+		},
+	},
+	Impl: func(tool *model.Tool, args map[string]interface{}) (string, error) {
+		var relativeDir string
+		tmp, ok := args["relative_dir"]
+		if ok {
+			relativeDir, ok = tmp.(string)
+			if !ok {
+				return "", fmt.Errorf("Invalid relative_dir in function arguments: %v", tmp)
+			}
+		}
+
+		var maxDepth int = -1
+		tmp, ok = args["max_depth"]
+		if ok {
+			maxDepth, ok = tmp.(int)
+			if !ok {
+				if tmps, ok := tmp.(string); ok {
+					tmpi, err := strconv.Atoi(tmps)
+					maxDepth = tmpi
+					if err != nil  {
+						return "", fmt.Errorf("Invalid max_depth in function arguments: %v", tmp)
+					}
+				} else {
+					return "", fmt.Errorf("Invalid max_depth in function arguments: %v", tmp)
+				}
+			}
+		}
+
+		result := tree(relativeDir, maxDepth)
+		ret, err := result.ToJson()
+		if err != nil {
+			return "", fmt.Errorf("Could not serialize result: %v", err)
+		}
+		return ret, nil
+	},
+}
+
+func tree(path string, maxDepth int) model.CallResult {
+	if path == "" {
+		path = "."
+	}
+	ok, reason := toolutil.IsPathWithinCWD(path)
+	if !ok {
+		return model.CallResult{Message: reason}
+	}
+
+	var treeOutput strings.Builder
+	treeOutput.WriteString(path + "\n")
+	err := buildTree(&treeOutput, path, "", maxDepth)
+	if err != nil {
+		return model.CallResult{
+			Message: err.Error(),
+		}
+	}
+
+	return model.CallResult{Result: treeOutput.String()}
+}
+
+func buildTree(output *strings.Builder, path string, prefix string, maxDepth int) error {
+	files, err := os.ReadDir(path)
+	if err != nil {
+		return err
+	}
+
+	for i, file := range files {
+		if strings.HasPrefix(file.Name(), ".") {
+			// Skip hidden files and directories
+			continue
+		}
+
+		isLast := i == len(files)-1
+		var branch string
+		if isLast {
+			branch = "└── "
+		} else {
+			branch = "├── "
+		}
+
+		info, _ := file.Info()
+		size := info.Size()
+		sizeStr := fmt.Sprintf(" (%d bytes)", size)
+
+		output.WriteString(prefix + branch + file.Name())
+		if file.IsDir() {
+			output.WriteString("/\n")
+			if maxDepth != 0 {
+				var nextPrefix string
+				if isLast {
+					nextPrefix = prefix + "    "
+				} else {
+					nextPrefix = prefix + "│   "
+				}
+				buildTree(output, filepath.Join(path, file.Name()), nextPrefix, maxDepth-1)
+			}
+		} else {
+			output.WriteString(sizeStr + "\n")
+		}
+	}
+
+	return nil
+}
+

pkg/lmcli/tools/tools.go

@@ -2,12 +2,12 @@ package tools
 
 import (
 	"fmt"
-	"os"
 
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 )
 
 var AvailableTools map[string]model.Tool = map[string]model.Tool{
+	"dir_tree":           DirTreeTool,
 	"read_dir":           ReadDirTool,
 	"read_file":          ReadFileTool,
 	"write_file":         WriteFileTool,
@@ -29,9 +29,6 @@ func ExecuteToolCalls(toolCalls []model.ToolCall, toolBag []model.Tool) ([]model
 			return nil, fmt.Errorf("Requested tool '%s' does not exist. Hallucination?", toolCall.Name)
 		}
 
-		// TODO: ability to silence this
-		fmt.Fprintf(os.Stderr, "\nINFO: Executing tool '%s' with args %s\n", toolCall.Name, toolCall.Parameters)
-
 		// Execute the tool
 		result, err := tool.Impl(tool, toolCall.Parameters)
 		if err != nil {

pkg/tui/tui.go

@@ -0,0 +1,844 @@
+package tui
+
+// The terminal UI for lmcli, launched from the `lmcli chat` command
+// TODO:
+// - conversation list view
+// - change model
+// - rename conversation
+// - set system prompt
+// - system prompt library?
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"time"
+
+	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
+	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"github.com/charmbracelet/bubbles/spinner"
+	"github.com/charmbracelet/bubbles/textarea"
+	"github.com/charmbracelet/bubbles/viewport"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+	"github.com/muesli/reflow/wordwrap"
+)
+
+type focusState int
+
+const (
+	focusInput focusState = iota
+	focusMessages
+)
+
+type editorTarget int
+
+const (
+	input editorTarget = iota
+	selectedMessage
+)
+
+type model struct {
+	width  int
+	height int
+
+	ctx           *lmcli.Context
+	convShortname string
+
+	// application state
+	conversation    *models.Conversation
+	messages        []models.Message
+	waitingForReply bool
+	editorTarget    editorTarget
+	stopSignal      chan interface{}
+	replyChan       chan models.Message
+	replyChunkChan  chan string
+	persistence     bool // whether we will save new messages in the conversation
+	err             error
+
+	// ui state
+	focus           focusState
+	wrap            bool     // whether message content is wrapped to viewport width
+	status          string   // a general status message
+	highlightCache  []string // a cache of syntax highlighted message content
+	messageOffsets  []int
+	selectedMessage int
+
+	// ui elements
+	content viewport.Model
+	input   textarea.Model
+	spinner spinner.Model
+}
+
+type message struct {
+	role    string
+	content string
+}
+
+// custom tea.Msg types
+type (
+	// sent on each chunk received from LLM
+	msgResponseChunk string
+	// sent when response is finished being received
+	msgResponseEnd string
+	// a special case of msgError that stops the response waiting animation
+	msgResponseError error
+	// sent on each completed reply
+	msgAssistantReply models.Message
+	// sent when a conversation is (re)loaded
+	msgConversationLoaded *models.Conversation
+	// sent when a new conversation title is set
+	msgConversationTitleChanged string
+	// send when a conversation's messages are laoded
+	msgMessagesLoaded []models.Message
+	// sent when an error occurs
+	msgError error
+)
+
+// styles
+var (
+	userStyle      = lipgloss.NewStyle().Faint(true).Bold(true).Foreground(lipgloss.Color("10"))
+	assistantStyle = lipgloss.NewStyle().Faint(true).Bold(true).Foreground(lipgloss.Color("12"))
+	messageStyle   = lipgloss.NewStyle().PaddingLeft(2).PaddingRight(2)
+	headerStyle    = lipgloss.NewStyle().
+			Background(lipgloss.Color("0"))
+	conversationStyle = lipgloss.NewStyle().
+				MarginTop(1).
+				MarginBottom(1)
+	footerStyle = lipgloss.NewStyle().
+			BorderTop(true).
+			BorderStyle(lipgloss.NormalBorder())
+)
+
+func (m model) Init() tea.Cmd {
+	return tea.Batch(
+		textarea.Blink,
+		m.spinner.Tick,
+		m.loadConversation(m.convShortname),
+		m.waitForChunk(),
+		m.waitForReply(),
+	)
+}
+
+func wrapError(err error) tea.Cmd {
+	return func() tea.Msg {
+		return msgError(err)
+	}
+}
+
+func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	var cmds []tea.Cmd
+
+	switch msg := msg.(type) {
+	case msgTempfileEditorClosed:
+		contents := string(msg)
+		switch m.editorTarget {
+		case input:
+			m.input.SetValue(contents)
+		case selectedMessage:
+			m.setMessageContents(m.selectedMessage, contents)
+			if m.persistence && m.messages[m.selectedMessage].ID > 0 {
+				// update persisted message
+				err := m.ctx.Store.UpdateMessage(&m.messages[m.selectedMessage])
+				if err != nil {
+					cmds = append(cmds, wrapError(fmt.Errorf("Could not save edited message: %v", err)))
+				}
+			}
+			m.updateContent()
+		}
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "ctrl+c":
+			if m.waitingForReply {
+				m.stopSignal <- ""
+				return m, nil
+			} else {
+				return m, tea.Quit
+			}
+		case "ctrl+p":
+			m.persistence = !m.persistence
+		case "ctrl+w":
+			m.wrap = !m.wrap
+			m.updateContent()
+		case "q":
+			if m.focus != focusInput {
+				return m, tea.Quit
+			}
+		default:
+			var inputHandled tea.Cmd
+			switch m.focus {
+			case focusInput:
+				inputHandled = m.handleInputKey(msg)
+			case focusMessages:
+				inputHandled = m.handleMessagesKey(msg)
+			}
+			if inputHandled != nil {
+				return m, inputHandled
+			}
+		}
+	case tea.WindowSizeMsg:
+		m.width = msg.Width
+		m.height = msg.Height
+		m.content.Width = msg.Width
+		m.content.Height = msg.Height - m.getFixedComponentHeight()
+		m.input.SetWidth(msg.Width - 1)
+		m.updateContent()
+	case msgConversationLoaded:
+		m.conversation = (*models.Conversation)(msg)
+		cmds = append(cmds, m.loadMessages(m.conversation))
+	case msgMessagesLoaded:
+		m.setMessages(msg)
+		m.updateContent()
+	case msgResponseChunk:
+		chunk := string(msg)
+		last := len(m.messages) - 1
+		if last >= 0 && m.messages[last].Role.IsAssistant() {
+			m.setMessageContents(last, m.messages[last].Content+chunk)
+		} else {
+			m.addMessage(models.Message{
+				Role:    models.MessageRoleAssistant,
+				Content: chunk,
+			})
+		}
+		m.updateContent()
+		cmds = append(cmds, m.waitForChunk()) // wait for the next chunk
+	case msgAssistantReply:
+		// the last reply that was being worked on is finished
+		reply := models.Message(msg)
+		reply.Content = strings.TrimSpace(reply.Content)
+
+		last := len(m.messages) - 1
+		if last < 0 {
+			panic("Unexpected empty messages handling msgAssistantReply")
+		}
+
+		if reply.Role.IsAssistant() && m.messages[last].Role.IsAssistant() {
+			// this was a continuation, so replace the previous message with the completed reply
+			m.setMessage(last, reply)
+		} else {
+			m.addMessage(reply)
+		}
+
+		if m.persistence {
+			var err error
+			if m.conversation.ID == 0 {
+				err = m.ctx.Store.SaveConversation(m.conversation)
+			}
+			if err != nil {
+				cmds = append(cmds, wrapError(err))
+			} else {
+				cmds = append(cmds, m.persistConversation())
+			}
+		}
+
+		if m.conversation.Title == "" {
+			cmds = append(cmds, m.generateConversationTitle())
+		}
+
+		m.updateContent()
+		cmds = append(cmds, m.waitForReply())
+	case msgResponseEnd:
+		m.waitingForReply = false
+		last := len(m.messages) - 1
+		if last < 0 {
+			panic("Unexpected empty messages handling msgResponseEnd")
+		}
+		m.setMessageContents(last, strings.TrimSpace(m.messages[last].Content))
+		m.updateContent()
+		m.status = "Press ctrl+s to send"
+	case msgResponseError:
+		m.waitingForReply = false
+		m.status = "Press ctrl+s to send"
+		m.err = error(msg)
+	case msgConversationTitleChanged:
+		title := string(msg)
+		m.conversation.Title = title
+		if m.persistence {
+			err := m.ctx.Store.SaveConversation(m.conversation)
+			if err != nil {
+				cmds = append(cmds, wrapError(err))
+			}
+		}
+	case msgError:
+		m.err = error(msg)
+	}
+
+	var cmd tea.Cmd
+	m.spinner, cmd = m.spinner.Update(msg)
+	if cmd != nil {
+		cmds = append(cmds, cmd)
+	}
+
+	inputCaptured := false
+	m.input, cmd = m.input.Update(msg)
+	if cmd != nil {
+		inputCaptured = true
+		cmds = append(cmds, cmd)
+	}
+
+	if !inputCaptured {
+		m.content, cmd = m.content.Update(msg)
+		if cmd != nil {
+			cmds = append(cmds, cmd)
+		}
+	}
+
+	return m, tea.Batch(cmds...)
+}
+
+func (m model) View() string {
+	if m.width == 0 {
+		// this is the case upon initial startup, but it's also a safe bet that
+		// we can just skip rendering if the terminal is really 0 width...
+		// without this, the m.*View() functions may crash
+		return ""
+	}
+
+	sections := make([]string, 0, 6)
+	sections = append(sections, m.headerView())
+	sections = append(sections, m.contentView())
+	error := m.errorView()
+	if error != "" {
+		sections = append(sections, error)
+	}
+	sections = append(sections, m.inputView())
+	sections = append(sections, m.footerView())
+
+	return lipgloss.JoinVertical(
+		lipgloss.Left,
+		sections...,
+	)
+}
+
+// returns the total height of "fixed" components, which are those which don't
+// change height dependent on window size.
+func (m *model) getFixedComponentHeight() int {
+	h := 0
+	h += m.input.Height()
+	h += lipgloss.Height(m.headerView())
+	h += lipgloss.Height(m.footerView())
+	errorView := m.errorView()
+	if errorView != "" {
+		h += lipgloss.Height(errorView)
+	}
+	return h
+}
+
+func (m *model) headerView() string {
+	titleStyle := lipgloss.NewStyle().
+		PaddingLeft(1).
+		PaddingRight(1).
+		Bold(true)
+	var title string
+	if m.conversation != nil && m.conversation.Title != "" {
+		title = m.conversation.Title
+	} else {
+		title = "Untitled"
+	}
+	part := titleStyle.Render(title)
+
+	return headerStyle.Width(m.width).Render(part)
+}
+
+func (m *model) contentView() string {
+	return m.content.View()
+}
+
+func (m *model) errorView() string {
+	if m.err == nil {
+		return ""
+	}
+	return lipgloss.NewStyle().
+		Width(m.width).
+		AlignHorizontal(lipgloss.Center).
+		Bold(true).
+		Foreground(lipgloss.Color("1")).
+		Render(fmt.Sprintf("%s", m.err))
+}
+
+func (m *model) inputView() string {
+	return m.input.View()
+}
+
+func (m *model) footerView() string {
+	segmentStyle := lipgloss.NewStyle().PaddingLeft(1).PaddingRight(1).Faint(true)
+	segmentSeparator := "|"
+
+	savingStyle := segmentStyle.Copy().Bold(true)
+	saving := ""
+	if m.persistence {
+		saving = savingStyle.Foreground(lipgloss.Color("2")).Render("✅💾")
+	} else {
+		saving = savingStyle.Foreground(lipgloss.Color("1")).Render("❌💾")
+	}
+
+	status := m.status
+	if m.waitingForReply {
+		status += m.spinner.View()
+	}
+
+	leftSegments := []string{
+		saving,
+		segmentStyle.Render(status),
+	}
+	rightSegments := []string{
+		segmentStyle.Render(fmt.Sprintf("Model: %s", *m.ctx.Config.Defaults.Model)),
+	}
+
+	left := strings.Join(leftSegments, segmentSeparator)
+	right := strings.Join(rightSegments, segmentSeparator)
+
+	totalWidth := lipgloss.Width(left) + lipgloss.Width(right)
+	remaining := m.width - totalWidth
+
+	var padding string
+	if remaining > 0 {
+		padding = strings.Repeat(" ", remaining)
+	}
+
+	footer := left + padding + right
+	if remaining < 0 {
+		ellipses := "... "
+		// this doesn't work very well, due to trying to trim a string with
+		// ansii chars already in it
+		footer = footer[:(len(footer)+remaining)-len(ellipses)-3] + ellipses
+	}
+	return footerStyle.Width(m.width).Render(footer)
+}
+
+func initialModel(ctx *lmcli.Context, convShortname string) model {
+	m := model{
+		ctx:           ctx,
+		convShortname: convShortname,
+		conversation:  &models.Conversation{},
+		persistence:   true,
+
+		stopSignal:     make(chan interface{}),
+		replyChan:      make(chan models.Message),
+		replyChunkChan: make(chan string),
+
+		wrap:            true,
+		selectedMessage: -1,
+	}
+
+	m.content = viewport.New(0, 0)
+
+	m.input = textarea.New()
+	m.input.CharLimit = 0
+	m.input.Placeholder = "Enter a message"
+
+	m.input.FocusedStyle.CursorLine = lipgloss.NewStyle()
+	m.input.ShowLineNumbers = false
+	m.input.SetHeight(4)
+	m.input.Focus()
+
+	m.spinner = spinner.New(spinner.WithSpinner(
+		spinner.Spinner{
+			Frames: []string{
+				".  ",
+				".. ",
+				"...",
+				".. ",
+				".  ",
+				"   ",
+			},
+			FPS: time.Second / 3,
+		},
+	))
+
+	m.waitingForReply = false
+	m.status = "Press ctrl+s to send"
+	return m
+}
+
+// fraction is the fraction of the total screen height into view the offset
+// should be scrolled into view. 0.5 = items will be snapped to middle of
+// view
+func scrollIntoView(vp *viewport.Model, offset int, fraction float32) {
+	currentOffset := vp.YOffset
+	if offset >= currentOffset && offset < currentOffset+vp.Height {
+		return
+	}
+	distance := currentOffset - offset
+	if distance < 0 {
+		// we should scroll down until it just comes into view
+		vp.SetYOffset(currentOffset - (distance + (vp.Height - int(float32(vp.Height)*fraction))) + 1)
+	} else {
+		// we should scroll up
+		vp.SetYOffset(currentOffset - distance - int(float32(vp.Height)*fraction))
+	}
+}
+
+func (m *model) handleMessagesKey(msg tea.KeyMsg) tea.Cmd {
+	switch msg.String() {
+	case "tab":
+		m.focus = focusInput
+		m.updateContent()
+		m.input.Focus()
+	case "e":
+		message := m.messages[m.selectedMessage]
+		cmd := openTempfileEditor("message.*.md", message.Content, "# Edit the message below\n")
+		m.editorTarget = selectedMessage
+		return cmd
+	case "ctrl+k":
+		if m.selectedMessage > 0 && len(m.messages) == len(m.messageOffsets) {
+			m.selectedMessage--
+			m.updateContent()
+			offset := m.messageOffsets[m.selectedMessage]
+			scrollIntoView(&m.content, offset, 0.1)
+		}
+	case "ctrl+j":
+		if m.selectedMessage < len(m.messages)-1 && len(m.messages) == len(m.messageOffsets) {
+			m.selectedMessage++
+			m.updateContent()
+			offset := m.messageOffsets[m.selectedMessage]
+			scrollIntoView(&m.content, offset, 0.1)
+		}
+	case "ctrl+r":
+		// resubmit the conversation with all messages up until and including the selected message
+		if m.waitingForReply || len(m.messages) == 0 {
+			return nil
+		}
+		m.messages = m.messages[:m.selectedMessage+1]
+		m.highlightCache = m.highlightCache[:m.selectedMessage+1]
+		m.updateContent()
+		m.content.GotoBottom()
+		return m.promptLLM()
+	}
+	return nil
+}
+
+func (m *model) handleInputKey(msg tea.KeyMsg) tea.Cmd {
+	switch msg.String() {
+	case "esc":
+		m.focus = focusMessages
+		if m.selectedMessage < 0 || m.selectedMessage >= len(m.messages) {
+			m.selectedMessage = len(m.messages) - 1
+		}
+		m.updateContent()
+		m.input.Blur()
+	case "ctrl+s":
+		userInput := strings.TrimSpace(m.input.Value())
+		if strings.TrimSpace(userInput) == "" {
+			return nil
+		}
+
+		if len(m.messages) > 0 && m.messages[len(m.messages)-1].Role == models.MessageRoleUser {
+			return wrapError(fmt.Errorf("Can't reply to a user message"))
+		}
+
+		reply := models.Message{
+			Role:    models.MessageRoleUser,
+			Content: userInput,
+		}
+
+		if m.persistence {
+			var err error
+			if m.conversation.ID == 0 {
+				err = m.ctx.Store.SaveConversation(m.conversation)
+			}
+			if err != nil {
+				return wrapError(err)
+			}
+
+			// ensure all messages up to the one we're about to add are persisted
+			cmd := m.persistConversation()
+			if cmd != nil {
+				return cmd
+			}
+
+			savedReply, err := m.ctx.Store.AddReply(m.conversation, reply)
+			if err != nil {
+				return wrapError(err)
+			}
+			reply = *savedReply
+		}
+
+		m.input.SetValue("")
+		m.addMessage(reply)
+
+		m.updateContent()
+		m.content.GotoBottom()
+		return m.promptLLM()
+	case "ctrl+e":
+		cmd := openTempfileEditor("message.*.md", m.input.Value(), "# Edit your input below\n")
+		m.editorTarget = input
+		return cmd
+	}
+	return nil
+}
+
+func (m *model) loadConversation(shortname string) tea.Cmd {
+	return func() tea.Msg {
+		if shortname == "" {
+			return nil
+		}
+		c, err := m.ctx.Store.ConversationByShortName(shortname)
+		if err != nil {
+			return msgError(fmt.Errorf("Could not lookup conversation: %v", err))
+		}
+		if c.ID == 0 {
+			return msgError(fmt.Errorf("Conversation not found: %s", shortname))
+		}
+		return msgConversationLoaded(c)
+	}
+}
+
+func (m *model) loadMessages(c *models.Conversation) tea.Cmd {
+	return func() tea.Msg {
+		messages, err := m.ctx.Store.Messages(c)
+		if err != nil {
+			return msgError(fmt.Errorf("Could not load conversation messages: %v\n", err))
+		}
+		return msgMessagesLoaded(messages)
+	}
+}
+
+func (m *model) waitForReply() tea.Cmd {
+	return func() tea.Msg {
+		return msgAssistantReply(<-m.replyChan)
+	}
+}
+
+func (m *model) waitForChunk() tea.Cmd {
+	return func() tea.Msg {
+		return msgResponseChunk(<-m.replyChunkChan)
+	}
+}
+
+func (m *model) generateConversationTitle() tea.Cmd {
+	return func() tea.Msg {
+		title, err := cmdutil.GenerateTitle(m.ctx, m.conversation)
+		if err != nil {
+			return msgError(err)
+		}
+		return msgConversationTitleChanged(title)
+	}
+}
+
+func (m *model) promptLLM() tea.Cmd {
+	m.waitingForReply = true
+	m.status = "Press ctrl+c to cancel"
+
+	return func() tea.Msg {
+		completionProvider, err := m.ctx.GetCompletionProvider(*m.ctx.Config.Defaults.Model)
+		if err != nil {
+			return msgError(err)
+		}
+
+		requestParams := models.RequestParameters{
+			Model:       *m.ctx.Config.Defaults.Model,
+			MaxTokens:   *m.ctx.Config.Defaults.MaxTokens,
+			Temperature: *m.ctx.Config.Defaults.Temperature,
+			ToolBag:     m.ctx.EnabledTools,
+		}
+
+		replyHandler := func(msg models.Message) {
+			m.replyChan <- msg
+		}
+
+		ctx, cancel := context.WithCancel(context.Background())
+
+		canceled := false
+		go func() {
+			select {
+			case <-m.stopSignal:
+				canceled = true
+				cancel()
+			}
+		}()
+
+		resp, err := completionProvider.CreateChatCompletionStream(
+			ctx, requestParams, m.messages, replyHandler, m.replyChunkChan,
+		)
+
+		if err != nil && !canceled {
+			return msgResponseError(err)
+		}
+
+		return msgResponseEnd(resp)
+	}
+}
+
+func (m *model) persistConversation() tea.Cmd {
+	existingMessages, err := m.ctx.Store.Messages(m.conversation)
+	if err != nil {
+		return wrapError(fmt.Errorf("Could not retrieve existing conversation messages while trying to save: %v", err))
+	}
+
+	existingById := make(map[uint]*models.Message, len(existingMessages))
+	for _, msg := range existingMessages {
+		existingById[msg.ID] = &msg
+	}
+
+	currentById := make(map[uint]*models.Message, len(m.messages))
+	for _, msg := range m.messages {
+		currentById[msg.ID] = &msg
+	}
+
+	for _, msg := range existingMessages {
+		_, ok := currentById[msg.ID]
+		if !ok {
+			err := m.ctx.Store.DeleteMessage(&msg)
+			if err != nil {
+				return wrapError(fmt.Errorf("Failed to remove messages: %v", err))
+			}
+		}
+	}
+
+	for i, msg := range m.messages {
+		if msg.ID > 0 {
+			exist, ok := existingById[msg.ID]
+			if ok {
+				if msg.Content == exist.Content {
+					continue
+				}
+				// update message when contents don't match that of store
+				err := m.ctx.Store.UpdateMessage(&msg)
+				if err != nil {
+					return wrapError(err)
+				}
+			} else {
+				// this would be quite odd... and I'm not sure how to handle
+				// it at the time of writing this
+			}
+		} else {
+			newMessage, err := m.ctx.Store.AddReply(m.conversation, msg)
+			if err != nil {
+				return wrapError(err)
+			}
+			m.setMessage(i, *newMessage)
+		}
+	}
+	return nil
+}
+
+func (m *model) setMessages(messages []models.Message) {
+	m.messages = messages
+	m.highlightCache = make([]string, len(messages))
+	for i, msg := range m.messages {
+		highlighted, _ := m.ctx.Chroma.HighlightS(msg.Content)
+		m.highlightCache[i] = highlighted
+	}
+}
+
+func (m *model) setMessage(i int, msg models.Message) {
+	if i >= len(m.messages) {
+		panic("i out of range")
+	}
+	highlighted, _ := m.ctx.Chroma.HighlightS(msg.Content)
+	m.messages[i] = msg
+	m.highlightCache[i] = highlighted
+}
+
+func (m *model) addMessage(msg models.Message) {
+	highlighted, _ := m.ctx.Chroma.HighlightS(msg.Content)
+	m.messages = append(m.messages, msg)
+	m.highlightCache = append(m.highlightCache, highlighted)
+}
+
+func (m *model) setMessageContents(i int, content string) {
+	if i >= len(m.messages) {
+		panic("i out of range")
+	}
+	highlighted, _ := m.ctx.Chroma.HighlightS(content)
+	m.messages[i].Content = content
+	m.highlightCache[i] = highlighted
+}
+
+func (m *model) updateContent() {
+	atBottom := m.content.AtBottom()
+	m.content.SetContent(m.conversationView())
+	if atBottom {
+		// if we were at bottom before the update, scroll with the output
+		m.content.GotoBottom()
+	}
+}
+
+// render the conversation into a string
+func (m *model) conversationView() string {
+	sb := strings.Builder{}
+	msgCnt := len(m.messages)
+
+	m.messageOffsets = make([]int, len(m.messages))
+	lineCnt := conversationStyle.GetMarginTop()
+	for i, message := range m.messages {
+		m.messageOffsets[i] = lineCnt
+
+		icon := "⚙️"
+		friendly := message.Role.FriendlyRole()
+		style := lipgloss.NewStyle().Bold(true).Faint(true)
+
+		switch message.Role {
+		case models.MessageRoleUser:
+			icon = ""
+			style = userStyle
+		case models.MessageRoleAssistant:
+			icon = ""
+			style = assistantStyle
+		case models.MessageRoleToolCall, models.MessageRoleToolResult:
+			icon = "🔧"
+		}
+
+		// write message heading with space for content
+		user := style.Render(icon + friendly)
+
+		var prefix string
+		var suffix string
+
+		faint := lipgloss.NewStyle().Faint(true)
+		if m.focus == focusMessages {
+			if i == m.selectedMessage {
+				prefix = "> "
+			}
+			suffix += faint.Render(fmt.Sprintf(" (%d/%d)", i+1, msgCnt))
+		}
+
+		if message.ID == 0 {
+			suffix += faint.Render(" (not saved)")
+		}
+
+		header := lipgloss.NewStyle().PaddingLeft(1).Render(prefix + user + suffix)
+		sb.WriteString(header)
+		lineCnt += lipgloss.Height(header)
+
+		// TODO: special rendering for tool calls/results?
+		if message.Content != "" {
+			sb.WriteString("\n\n")
+			lineCnt += 1
+
+			// write message contents
+			var highlighted string
+			if m.highlightCache[i] == "" {
+				highlighted = message.Content
+			} else {
+				highlighted = m.highlightCache[i]
+			}
+			var contents string
+			if m.wrap {
+				wrapWidth := m.content.Width - messageStyle.GetHorizontalPadding() - 2
+				wrapped := wordwrap.String(highlighted, wrapWidth)
+				contents = wrapped
+			} else {
+				contents = highlighted
+			}
+			sb.WriteString(messageStyle.Width(0).Render(contents))
+			lineCnt += lipgloss.Height(contents)
+		}
+
+		if i < msgCnt-1 {
+			sb.WriteString("\n\n")
+			lineCnt += 1
+		}
+	}
+	return conversationStyle.Render(sb.String())
+}
+
+func Launch(ctx *lmcli.Context, convShortname string) error {
+	p := tea.NewProgram(initialModel(ctx, convShortname), tea.WithAltScreen())
+	if _, err := p.Run(); err != nil {
+		return fmt.Errorf("Error running program: %v", err)
+	}
+	return nil
+}

pkg/tui/util.go

@@ -0,0 +1,42 @@
+package tui
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+type msgTempfileEditorClosed string
+
+// openTempfileEditor opens an $EDITOR on a new temporary file with the given
+// content. Upon closing, the contents of the file are read back returned
+// wrapped in a msgTempfileEditorClosed returned by the tea.Cmd
+func openTempfileEditor(pattern string, content string, placeholder string) tea.Cmd {
+	msgFile, _ := os.CreateTemp("/tmp", pattern)
+
+	err := os.WriteFile(msgFile.Name(), []byte(placeholder+content), os.ModeAppend)
+	if err != nil {
+		return wrapError(err)
+	}
+
+	editor := os.Getenv("EDITOR")
+	if editor == "" {
+		editor = "vim"
+	}
+
+	c := exec.Command(editor, msgFile.Name())
+	return tea.ExecProcess(c, func(err error) tea.Msg {
+		bytes, err := os.ReadFile(msgFile.Name())
+		if err != nil {
+			return msgError(err)
+		}
+		fileContents := string(bytes)
+		if strings.HasPrefix(fileContents, placeholder) {
+			fileContents = fileContents[len(placeholder):]
+		}
+		stripped := strings.Trim(fileContents, "\n \t")
+		return msgTempfileEditorClosed(stripped)
+	})
+}