wi/main.go
2016-07-25 17:47:19 +03:00

193 lines
3.5 KiB
Go

/**
* @file main.go
* @author Mikhail Klementyev jollheef<AT>riseup.net
* @license GNU GPLv3
* @date July, 2016
* @brief Tiny non-interactive cli browser
*/
package main
import (
"bytes"
"database/sql"
"strings"
"fmt"
"io/ioutil"
"log"
"net/http"
"github.com/jollheef/wi/storage"
"github.com/jaytaylor/html2text"
"golang.org/x/net/html"
"golang.org/x/net/html/charset"
kingpin "gopkg.in/alecthomas/kingpin.v2"
)
var (
get = kingpin.Command("get", "Get url")
getUrl = get.Arg("url", "Url").Required().String()
link = kingpin.Command("link", "Get link")
linkNo = link.Arg("no", "Number").Required().Int64()
historyList = kingpin.Command("history", "List history")
historyListItems = historyList.Arg("items", "Amount of items").Int64()
historyListAll = historyList.Flag("all", "Show all items").Bool()
)
func parseLink(db *sql.DB, oldPage, value string, req *http.Request) (htmlPage string, err error) {
url, err := req.URL.Parse(value)
if err != nil {
return
}
linkNo, err := storage.GetLinkID(db, url.String())
if err != nil {
linkNo, err = storage.AddLink(db, url.String())
if err != nil {
return
}
}
for _, s := range []string{value, html.EscapeString(value)} {
htmlPage = strings.Replace(oldPage, "\""+s+"\"",
"\""+fmt.Sprintf("%d", linkNo)+"\"", -1)
}
return
}
func parseLinks(db *sql.DB, body []byte, req *http.Request) (htmlPage string, err error) {
htmlPage = string(body)
z := html.NewTokenizer(bytes.NewReader(body))
for {
tt := z.Next()
if tt == html.ErrorToken {
break
}
for {
key, value, moreAttr := z.TagAttr()
if string(key) == "href" {
htmlPage, err = parseLink(db, htmlPage, string(value), req)
if err != nil {
return
}
}
if !moreAttr {
break
}
}
}
return
}
func cmd_url(db *sql.DB, url string) {
client := &http.Client{}
// TODO Full url encoding
req, err := http.NewRequest("GET", strings.Replace(url, " ", "%20", -1), nil)
if err != nil {
log.Fatalln(err)
}
req.Header.Set("User-Agent", "Wi 0.0")
resp, err := client.Do(req)
if err != nil {
log.Fatalln(err)
}
storage.AddHistoryURL(db, url)
defer resp.Body.Close()
utf8, err := charset.NewReader(resp.Body, resp.Header.Get("Content-Type"))
if err != nil {
fmt.Println("Encoding error:", err)
return
}
body, err := ioutil.ReadAll(utf8)
if err != nil {
fmt.Println("IO error:", err)
return
}
htmlPage, err := parseLinks(db, body, req)
if err != nil {
panic(err)
}
text, err := html2text.FromString(htmlPage)
if err != nil {
panic(err)
}
text += ""
fmt.Println(text)
}
func cmd_link(db *sql.DB, linkID int64) {
url, err := storage.GetLink(db, linkID)
if err != nil {
panic(err)
}
cmd_url(db, url)
}
func cmd_history(db *sql.DB, argAmount, defaultAmount int64, all bool) {
history, err := storage.GetHistory(db)
if err != nil {
panic(err)
}
var amount int64
if all {
amount = int64(len(history))
} else if argAmount == 0 {
if int64(len(history)) < defaultAmount {
amount = int64(len(history))
} else {
amount = defaultAmount
}
} else {
if amount > int64(len(history)) {
amount = int64(len(history))
} else {
amount = argAmount
}
}
for _, h := range history[int64(len(history))-amount:] {
fmt.Println(h.ID, h.URL)
}
}
func main() {
db, err := storage.OpenDB("/tmp/wi.db")
if err != nil {
panic(err)
}
defer db.Close()
switch kingpin.Parse() {
case "get":
cmd_url(db, *getUrl)
case "link":
cmd_link(db, *linkNo)
case "history":
cmd_history(db, *historyListItems, 20, *historyListAll)
}
}