diff --git a/README.md b/README.md
index 4c8ad00..6d16e9e 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,52 @@
 # chatgpt
-CLI application for working with ChatGPT
+
+CLI application for working with ChatGPT.
+
+```
+go install github.com/verdverm/chatgpt@latest
+
+chatgpt -h
+```
+
+Examples:
+
+```
+Chat with ChatGPT in console.
+
+Examples:
+  # start an interactive session
+  chatgpt -i
+
+  # ask chatgpt for a one-time response
+  chatgpt -q "answer me this ChatGPT..."
+
+  # provide context to a question or conversation
+  chatgpt context.txt -i
+  chatgpt context.txt -q "answer me this ChatGPT..."
+
+  # read context from file and write response back
+  chatgpt convo.txt
+
+  # pipe content from another program, useful for ! in vim visual mode
+  cat convo.txt | chatgpt
+
+  # inspect the predifined pretexts, which set ChatGPT's mood
+  chatgpt -p list
+  chatgpt -p view:<name>
+
+  # use a pretext with any of the previous modes
+  chatgpt -p optimistic -i
+  chatgpt -p cynic -q "Is the world going to be ok?"
+  chatgpt -p teacher convo.txt
+
+Usage:
+  chatgpt [file] [flags]
+
+Flags:
+  -h, --help              help for chatgpt
+  -i, --interactive       start an interactive session with ChatGPT
+  -p, --pretext string    pretext to add to ChatGPT input, use 'list' or 'view:<name>' to inspect predefined, '<name>' to use a pretext, or otherwise supply any custom text
+  -q, --question string   ask a single question and print the response back
+  -t, --tokens int        set the MaxTokens to generate per response (default 420)
+```
+
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..07c0f4e
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,13 @@
+module github.com/verdverm/chatgpt
+
+go 1.18
+
+require (
+	github.com/sashabaranov/go-gpt3 v1.0.1
+	github.com/spf13/cobra v1.6.1
+)
+
+require (
+	github.com/inconshreveable/mousetrap v1.0.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..78ec907
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,12 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/inconshreveable/mousetrap v1.0.1 h1:U3uMjPSQEBMNp1lFxmllqCPM6P5u/Xq7Pgzkat/bFNc=
+github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/sashabaranov/go-gpt3 v1.0.1 h1:KHwY4uroFlX1qI1Hui7d31ZI6uzbNGL9zAkh1FkfhuM=
+github.com/sashabaranov/go-gpt3 v1.0.1/go.mod h1:BIZdbwdzxZbCrcKGMGH6u2eyGe1xFuX9Anmh3tCP8lQ=
+github.com/spf13/cobra v1.6.1 h1:o94oiPyS4KD1mPy2fmcYYHHfCxLqYjJOhGsCHFZtEzA=
+github.com/spf13/cobra v1.6.1/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..de86bf8
--- /dev/null
+++ b/main.go
@@ -0,0 +1,252 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"embed"
+	"fmt"
+	"os"
+	"strings"
+
+	gpt3 "github.com/sashabaranov/go-gpt3"
+	"github.com/spf13/cobra"
+)
+
+var LongHelp = `
+Chat with ChatGPT in console.
+
+Examples:
+  # start an interactive session
+  chatgpt -i
+
+  # ask chatgpt for a one-time response
+  chatgpt -q "answer me this ChatGPT..."
+
+  # provide context to a question or conversation
+  chatgpt context.txt -i
+  chatgpt context.txt -q "answer me this ChatGPT..."
+
+  # read context from file and write response back
+  chatgpt convo.txt
+
+  # pipe content from another program, useful for ! in vim visual mode
+  cat convo.txt | chatgpt
+
+  # inspect the predifined pretexts, which set ChatGPT's mood
+  chatgpt -p list
+  chatgpt -p view:<name>
+
+  # use a pretext with any of the previous modes
+  chatgpt -p optimistic -i
+  chatgpt -p cynic -q "Is the world going to be ok?"
+  chatgpt -p teacher convo.txt
+`
+
+//go:embed pretexts/*
+var predefined embed.FS
+
+var Question string
+var Pretext string
+var MaxTokens int
+var PromptMode bool
+var PromptText string
+
+func GetResponse(client *gpt3.Client, ctx context.Context, question string) (string, error) {
+	req := gpt3.CompletionRequest{
+		Model:     gpt3.GPT3TextDavinci003,
+		MaxTokens: MaxTokens,
+		Prompt:    question,
+	}
+	resp, err := client.CreateCompletion(ctx, req)
+	if err != nil {
+		return "", err
+	}
+
+	return resp.Choices[0].Text, nil
+}
+
+type NullWriter int
+
+func (NullWriter) Write([]byte) (int, error) { return 0, nil }
+
+func main() {
+	apiKey := os.Getenv("CHATGPT_API_KEY")
+	if apiKey == "" {
+		fmt.Println("CHATGPT_API_KEY environment var is missing\nVisit https://platform.openai.com/account/api-keys to get one\n")
+		os.Exit(1)
+	}
+
+	client := gpt3.NewClient(apiKey)
+
+	rootCmd := &cobra.Command{
+		Use:   "chatgpt [file]",
+		Short: "Chat with ChatGPT in console.",
+		Long: LongHelp,
+		Run: func(cmd *cobra.Command, args []string) {
+			var err error
+			var filename string
+
+			if Pretext != "" {
+
+				files, err := predefined.ReadDir("pretexts")
+				if err != nil {
+					panic(err)
+				}
+
+				if Pretext == "list" {
+					for _, f := range files {
+						fmt.Println(strings.TrimSuffix(f.Name(), ".txt"))
+					}
+					os.Exit(0)
+				}
+
+				if strings.HasPrefix(Pretext, "view:") {
+					name := strings.TrimPrefix(Pretext, "view:")
+					contents, err := predefined.ReadFile("pretexts/" + name + ".txt")
+					if err != nil {
+						fmt.Println(err)
+						os.Exit(1)
+					}
+					fmt.Println(string(contents))
+					os.Exit(0)
+				}
+
+				// look for predefined
+				for _, f := range files {
+					name := strings.TrimSuffix(f.Name(), ".txt")
+					if name == Pretext {
+						contents, err := predefined.ReadFile("pretexts/" + name + ".txt")
+						if err != nil {
+							fmt.Println(err)
+							os.Exit(1)
+						}
+						PromptText = string(contents)
+						break
+					}
+				}
+
+				if PromptText == "" {
+					PromptText = Pretext
+				}
+
+			}
+
+			if len(args) == 0 && !PromptMode && Question == "" {
+				reader := bufio.NewReader(os.Stdin)
+				var buf bytes.Buffer
+				for {
+						b, err := reader.ReadByte()
+						if err != nil {
+								break
+						}
+						buf.WriteByte(b)
+				}
+				PromptText += buf.String()
+			} else if len(args) == 1 {
+				filename = args[0]
+				content, err := os.ReadFile(filename)
+				if err != nil {
+					fmt.Println(err)
+					return
+				}
+				PromptText += string(content)
+			}
+
+			if Question != "" {
+				PromptText += "\n" + Question
+			}
+
+			if PromptMode {
+				fmt.Println(PromptText)
+				err = RunPrompt(client)
+			} else {
+				err = RunOnce(client, filename)
+			}
+
+			if err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
+
+		},
+	}
+
+
+	rootCmd.Flags().StringVarP(&Question, "question", "q", "", "ask a single question and print the response back")
+	rootCmd.Flags().StringVarP(&Pretext, "pretext", "p", "", "pretext to add to ChatGPT input, use 'list' or 'view:<name>' to inspect predefined, '<name>' to use a pretext, or otherwise supply any custom text")
+	rootCmd.Flags().BoolVarP(&PromptMode, "interactive", "i", false, "start an interactive session with ChatGPT")
+	rootCmd.Flags().IntVarP(&MaxTokens, "tokens", "t", 420, "set the MaxTokens to generate per response")
+
+	rootCmd.Execute()
+}
+
+func RunPrompt(client *gpt3.Client) error {
+	ctx := context.Background()
+	scanner := bufio.NewScanner(os.Stdin)
+	quit := false
+
+	for !quit {
+		fmt.Print("> ")
+
+		if !scanner.Scan() {
+			break
+		}
+
+		question := scanner.Text()
+		switch question {
+		case "quit", "q", "exit":
+			quit = true
+
+		default:
+			PromptText += "\n\n> " + question + "\n"
+			r, err := GetResponse(client, ctx, PromptText)
+			if err != nil {
+				return err
+			}
+
+			PromptText += "\n" + r + "\n"
+			fmt.Println(r + "\n")
+		}
+	}
+	
+	return nil
+}
+
+func RunOnce(client *gpt3.Client, filename string) error {
+	ctx := context.Background()
+
+	r, err := GetResponse(client, ctx, PromptText)
+	if err != nil {
+		return err
+	}
+
+	if filename == "" {
+		fmt.Println(r)
+	} else {
+		err = AppendToFile(filename, r)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// AppendToFile provides a function to append data to an existing file,
+// creating it if it doesn't exist
+func AppendToFile(filename string, data string) error {
+	// Open the file in append mode
+	file, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return err
+	}
+
+	// Append the data to the file
+	_, err = file.WriteString(data)
+	if err != nil {
+		return err
+	}
+
+	return file.Close()
+}
diff --git a/pretexts/coding.txt b/pretexts/coding.txt
new file mode 100644
index 0000000..85842b7
--- /dev/null
+++ b/pretexts/coding.txt
@@ -0,0 +1,3 @@
+As an enthusiastic teachers assistant, respond to the following.
+Provide context for the answer, then a markdown code block based on the
+user's prompt, followed by a discussion to how the solution works.
diff --git a/pretexts/cynic.txt b/pretexts/cynic.txt
new file mode 100644
index 0000000..0fa206e
--- /dev/null
+++ b/pretexts/cynic.txt
@@ -0,0 +1,2 @@
+As a cynical, gloomy person, respond to the following.
+Talk about problems over solutions and present unpleasant outcomes.
diff --git a/pretexts/optimistic.txt b/pretexts/optimistic.txt
new file mode 100644
index 0000000..99a9414
--- /dev/null
+++ b/pretexts/optimistic.txt
@@ -0,0 +1,2 @@
+As a happy, optimistic person, respond to the following.
+Focus on solutions over problems and present favorable outcomes.
diff --git a/pretexts/teacher.txt b/pretexts/teacher.txt
new file mode 100644
index 0000000..990dfa8
--- /dev/null
+++ b/pretexts/teacher.txt
@@ -0,0 +1,2 @@
+As an enthusiastic teacher, respond to the following.
+Provide an answer discuss why it is correct.
diff --git a/pretexts/thoughtful.txt b/pretexts/thoughtful.txt
new file mode 100644
index 0000000..435c4a4
--- /dev/null
+++ b/pretexts/thoughtful.txt
@@ -0,0 +1,2 @@
+As a thoughtful, neutral person, respond the following.
+Provide context and background. Discuss the pros, cons, and tradeoffs.
diff --git a/test.txt b/test.txt
new file mode 100644
index 0000000..4ab803d
--- /dev/null
+++ b/test.txt
@@ -0,0 +1,2 @@
+> write some python to parse a timestamp
+