/
main.go
101 lines (85 loc) · 2.11 KB
/
main.go
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package main
import (
"encoding/json"
"flag"
"fmt"
"io"
"math/rand"
"net/http"
"os"
"time"
"github.com/jackc/markovbot/markov"
)
const Version = "1.0.0"
var options struct {
prefixSize int
maxOutputSize int
seed int64
filePath string
httpAddr string
version bool
}
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "usage: %s [options]\n", os.Args[0])
flag.PrintDefaults()
}
flag.IntVar(&options.prefixSize, "prefix", 2, "prefix size")
flag.IntVar(&options.maxOutputSize, "output", 200, "max output size in words")
flag.Int64Var(&options.seed, "seed", -1, "seed for random number generator")
flag.StringVar(&options.filePath, "file", "grimm.txt", "source file (if not provided will read from stdin)")
flag.StringVar(&options.httpAddr, "http", "127.0.0.1:23001", "HTTP listen address (e.g. 127.0.0.1:230001)")
flag.BoolVar(&options.version, "version", false, "print version and exit")
flag.Parse()
if options.version {
fmt.Printf("grimmbot v%v\n", Version)
os.Exit(0)
}
if options.seed < 0 {
options.seed = time.Now().UnixNano()
fmt.Fprintln(os.Stderr, "seed:", options.seed)
}
rand.Seed(options.seed)
var err error
var file *os.File
var in io.Reader
if options.filePath != "" {
file, err = os.Open(options.filePath)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
in = file
} else {
in = os.Stdin
}
chain, err := markov.NewChain(in, options.prefixSize)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
if file != nil {
file.Close()
}
if options.httpAddr != "" {
fmt.Fprintln(os.Stderr, "Listening on:", options.httpAddr)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
var jsonResp struct {
Text string `json:"text"`
}
jsonResp.Text = chain.Generate(options.maxOutputSize)
js, err := json.Marshal(jsonResp)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
w.Write(js)
})
err = http.ListenAndServe(options.httpAddr, nil)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
} else {
fmt.Println(chain.Generate(options.maxOutputSize))
}
}