how to have go find packages online? - go

Question

I'm trying to run a go program using LiteIDE x22 but I get the message
C:/Go/bin/go.exe build [C:/Users/admins/Desktop/desktp/worm_scraper-master]
worm_scraper.go:11:2: cannot find package "github.com/codegangsta/cli" in any of:
C:\Go\src\pkg\github.com\codegangsta\cli (from $GOROOT)
C:\users\admins\gostuff\src\github.com\codegangsta\cli (from $GOPATH)
worm_scraper.go:12:2: cannot find package "github.com/puerkitobio/goquery" in any of:
C:\Go\src\pkg\github.com\puerkitobio\goquery (from $GOROOT)
C:\users\admins\gostuff\src\github.com\puerkitobio\goquery (from $GOPATH)
Error: process exited with code 1.
I think this means it's looking for it on my harddrive instead of online right? (btw I'm pretty clueless about programming just trying to something some else wrote)
how to I get it to access the web?
here's the full code
package main
import (
"errors"
"fmt"
"os"
"os/exec"
"regexp"
"strings"
"github.com/codegangsta/cli"
"github.com/puerkitobio/goquery"
)
const (
MainSite = "https://parahumans.wordpress.com/"
TableOfContents = "https://parahumans.wordpress.com/table-of-contents/"
)
type Arc struct {
Identifier string
Title string
Chapters []Chapter
}
type Chapter struct {
Title string
Url string
Tags []string
Paragraphs []Paragraph
Retries int
DatePosted string
}
type Paragraph string
// Format the paragraph
func (p *Paragraph) Format() {
s := string(*p)
// Handle emphasis
s = strings.Replace(s, "<em>", "*", -1)
s = strings.Replace(s, "</em>", "*", -1)
s = strings.Replace(s, "<i>", "*", -1)
s = strings.Replace(s, "</i>", "*", -1)
// Handle bold
s = strings.Replace(s, "<strong>", "**", -1)
s = strings.Replace(s, "</strong>", "**", -1)
s = strings.Replace(s, "<b>", "**", -1)
s = strings.Replace(s, "</b>", "**", -1)
// Remove new lines
s = strings.Replace(s, "\n", "", -1)
// And random double spaces
s = strings.Replace(s, ". ", ". ", -1)
*p = Paragraph(s)
}
// Return the Arc that the given chapter belongs to
func (ch *Chapter) WhichArc(arcList []*Arc) (*Arc, error) {
for _, arc := range arcList {
if strings.Replace(ch.Title[:2], ".", "", -1) == arc.Identifier {
return arc, nil
}
}
return &Arc{}, errors.New("chapter '" + ch.Title + "' did not match any Arcs")
}
// Parse a chapter and return it
func (ch *Chapter) Parse(done chan bool) {
if ch.Retries > 3 {
panic("Chapter url '" + ch.Url + "' has timed out too many times")
}
// Get the chapter
if strings.HasPrefix(ch.Url, "http") == false {
// Make sure it begins with http so goquery can use it
ch.Url = "https://" + ch.Url
}
doc, err := goquery.NewDocument(ch.Url)
if err != nil {
// Try again
ch.Retries++
go ch.Parse(done)
return
}
// Set the new chapter title
ch.Title = doc.Find("h1.entry-title").Text()
// Set the tags
doc.Find(".entry-meta a[rel=tag]").Each(func(_ int, s *goquery.Selection) {
ch.Tags = append(ch.Tags, s.Text())
if len(ch.Tags) == 0 {
ch.Tags = append(ch.Tags, "NONE")
}
})
// Get the date it was posted
ch.DatePosted = doc.Find("time.entry-date").Text()
// Now we'll get all the paragraphs
doc.Find(".entry-content > p").Each(func(_ int, s *goquery.Selection) {
// Check for the previous/next links
if len(s.Find("a").Nodes) > 0 {
return
}
// Get the paragraph HTML
st, _ := s.Html()
para := Paragraph("")
// Get the actual paragraph
if val, exists := s.Attr("padding-left"); exists && val == "30px" {
// Check to see if the paragraph is special (indented) block
para = Paragraph(" " + st)
} else if val, exists := s.Attr("text-align"); exists && val == "center" {
// Otherwise check to see if it's a separator paragraph
para = Paragraph("----------")
} else {
// It's just a normal paragraph in this case
para = Paragraph(st)
}
// And add the paragraph to the chapter
para.Format()
ch.Paragraphs = append(ch.Paragraphs, para)
})
// Finally, let's signal a success
done <- true
}
// Return a slice of Arcs extracted from the table of contents
func ParseArcs(s string) []*Arc {
arcs := []*Arc{}
r, _ := regexp.Compile(`[0-9]+`)
for _, line := range strings.Split(s, "\n") {
line = strings.TrimSpace(line)
if strings.HasPrefix(line, "Arc") {
arcs = append(arcs, &Arc{
Identifier: r.FindString(line),
Title: line,
})
} else if strings.HasPrefix(line, "Epilogue") {
arcs = append(arcs, &Arc{
Identifier: "E",
Title: line,
})
}
}
return arcs
}
func main() {
// Define the app
app := cli.NewApp()
app.Name = "Worm Scraper"
app.Usage = "A tool to let you get an updated EPUB copy of the serial web novel Worm, by Wildbow"
app.Version = "1.0"
app.Author = "Benjamin Harris"
// Define the application flags
app.Flags = []cli.Flag{
cli.BoolFlag{"pdf", "Save the book as a PDF instead of an EPUB, if possible"},
cli.BoolFlag{"with-link", "Include a link to the chapter online"},
cli.BoolFlag{"with-tags", "Include the tags each chapter was posted under"},
cli.BoolFlag{"with-date", "Include the date each chapter was posted"},
}
// The heart of the application
app.Action = func(context *cli.Context) {
// Starting the program
fmt.Println("Starting to scrape Worm")
// Get the list of arcs from the table of contents
fmt.Println("Gathering links from table of contents...")
contents, err := goquery.NewDocument(TableOfContents)
if err != nil {
panic("Failed to get the table of contents! " + err.Error())
}
// Parse the arcs
arcs := ParseArcs(contents.Find(".entry-content").Text())
// Now get the links for the arc chapters
contents.Find(".entry-content a:not([class*=share-icon])").Each(func(_ int, s *goquery.Selection) {
ch := Chapter{}
ch.Title = strings.Replace(strings.TrimSpace(s.Text()), "\n", "", -1)
ch.Url, _ = s.Attr("href")
if ch.Title == "" {
return
}
arc, _ := ch.WhichArc(arcs)
arc.Chapters = append(arc.Chapters, ch)
})
// Manually add missing chapter in Epilogue
c := Chapter{
Title: "E.2",
Url: "https://parahumans.wordpress.com/2013/11/05/teneral-e-2/",
}
a, _ := c.WhichArc(arcs)
a.Chapters = append(a.Chapters, c)
copy(a.Chapters[1+1:], a.Chapters[1:])
a.Chapters[1] = c
// Now start getting the chapters
chapters := 0
done := make(chan bool)
for _, arc := range arcs {
for i, _ := range arc.Chapters {
chapters++
go arc.Chapters[i].Parse(done)
}
}
fmt.Println("Starting to parse", chapters, "chapters")
fmt.Print("Finished: ")
totalChapters := chapters
for {
select {
case <-done:
chapters--
fmt.Print(totalChapters-chapters, ",")
}
if chapters == 0 {
// We're done with all the chapters
close(done)
fmt.Println()
break
}
}
// And let's write all this stuff to a file now
fmt.Println("Saving results to file...")
f, err := os.OpenFile("Worm.md", os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
if err != nil {
panic(err)
}
defer f.Close()
// Define pagebreak
PageBreak := "\n\n"
// Write the cover
f.WriteString("# Worm\n\n")
f.WriteString("By Wildbow\n\n")
f.WriteString("Website: " + MainSite)
// Now loop through the Arcs
for _, arc := range arcs {
f.WriteString(PageBreak + "# " + arc.Title)
for _, chapter := range arc.Chapters {
f.WriteString("\n\n")
f.WriteString("## " + chapter.Title + "\n\n")
if context.Bool("with-tags") {
f.WriteString("**Tags:** " + strings.Join(chapter.Tags, ", ") + " ")
}
if context.Bool("with-date") {
f.WriteString("**Date:** " + chapter.DatePosted + " ")
}
if context.Bool("with-link") {
f.WriteString("**Link:** " + chapter.Url + " ")
}
f.WriteString("\n\n")
// Now save the chapter's paragraphs
for _, p := range chapter.Paragraphs {
f.WriteString(string(p) + "\n\n")
}
}
}
// Now let's try to convert the markdown file into an ebook format (epub, pdf)
fmt.Print("Attempting to convert Markdown file... ")
cmdText := []string{"-S", "Worm.md", "--epub-chapter-level", "2", "-o", "Worm.epub"}
if context.Bool("pdf") {
cmdText = []string{"Worm.md", "-o", "Worm.pdf"}
PageBreak = `<div style="page-break-after: always;"></div>`
}
cmd := exec.Command("pandoc", cmdText...)
err = cmd.Run()
if err != nil {
fmt.Println("Conversion failed! Make sure you've installed Pandoc (http://johnmacfarlane.net/pandoc/installing.html) if you want to convert the generated Markdown file to an ebook compatible format. In the meantime, we've left you the Markdown file.")
} else {
_ = os.Remove("Worm.md")
fmt.Println("Completed!")
}
}
// Run the application
app.Run(os.Args)
}
oh also would it be possible to modify it to output as .txt or .mobi? if not I'll just convert using Calibre. Thanks in advance.
Oh if it matters I'm using windows 7 64-bit

Answer 1

The go compiler doesn't import the libraries directly from the internet but it does know how to fetch them for you. When you import something like github.com/codegangsta/cli it doesn't look for it on that URL but instead it looks for it on your GOPATH/src folder.
The go get command can fetch the library for you in it's URL and download it to your GOPATH.
If you have already setup your GOPATH (if not, read How to Write Go Code) then before running your code run the command go get library for the go tool to download it for you. In your example you should run the following commands:
go get github.com/codegangsta/cli
go get github.com/puerkitobio/goquery
That would download the libraries to GOPATH/src/github.com/codegangsta/cli and GOPATH/src/github.com/puerkitobio/goquery respectively.