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page.go
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page.go
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package main
import (
"fmt"
"io/ioutil"
"net/http"
"regexp"
"runtime"
"strings"
"text/template"
"github.com/gomarkdown/markdown"
"github.com/gomarkdown/markdown/html"
"github.com/gomarkdown/markdown/parser"
)
// PageTemplateData template data
type PageTemplateData struct {
Page *Page
GlobalContext *GlobalContext
}
// Page containing Markdown text
type Page struct {
Name string
Content []byte
}
const pagesPath = "data/pages/"
const mainMenuName = "main-menu"
var defaultMainMenu = []byte("[Home](/pages/Home)\n\n[Task List](/pages/Task List)\n")
var validPath = regexp.MustCompile("^/(edit|save|pages)/(.+)$")
var mainMenu = getMainMenu()
var viewPageTemplate = template.Must(template.New("").
Funcs(template.FuncMap{"markdownToHTML": markdownToHTML}).
ParseFiles("templates/view.html", "templates/base.html"))
var editPageTemplate = template.Must(
template.ParseFiles("templates/edit.html", "templates/base.html"))
func getMainMenu() string {
content, err := ioutil.ReadFile(pagesPath + mainMenuName)
if err != nil {
content = defaultMainMenu
}
return markdownToHTML(content)
}
func markdownToHTML(args ...interface{}) string {
extensions := parser.CommonExtensions | parser.AutoHeadingIDs
parser := parser.NewWithExtensions(extensions)
htmlFlags := html.CommonFlags | html.HrefTargetBlank | html.TOC
opts := html.RendererOptions{Flags: htmlFlags}
renderer := html.NewRenderer(opts)
htmlString := markdown.ToHTML([]byte(fmt.Sprintf("%s", args...)), parser, renderer)
// Remove escaping of ampersands preceeding a symbol number
return strings.ReplaceAll(string(htmlString), "&#", "&#")
}
func (page *Page) save() error {
filename := pagesPath + page.Name
return ioutil.WriteFile(filename, page.Content, 0644)
}
func loadPage(name string) (*Page, error) {
content, err := ioutil.ReadFile(pagesPath + name)
if err != nil {
return nil, err
}
return &Page{Name: name, Content: content}, nil
}
func getName(request *http.Request) string {
regexResult := validPath.FindStringSubmatch(request.URL.Path)
if regexResult == nil {
return ""
}
return regexResult[2] // Name is in remainder part of regex result
}
func viewPageHandler(writer http.ResponseWriter, request *http.Request) {
name := getName(request)
page, err := loadPage(name)
if err != nil {
http.Redirect(writer, request, "/edit/"+name, http.StatusFound)
return
}
updateHistory(name)
updatePageCache(page)
templateData := PageTemplateData{Page: page, GlobalContext: &globalContext}
viewPageTemplate.ExecuteTemplate(writer, "base", templateData)
}
func editPageHandler(writer http.ResponseWriter, request *http.Request) {
name := getName(request)
page, err := loadPage(name)
if err != nil {
page = &Page{Name: name}
}
templateData := PageTemplateData{Page: page, GlobalContext: &globalContext}
editPageTemplate.ExecuteTemplate(writer, "base", templateData)
}
func savePageHandler(writer http.ResponseWriter, request *http.Request) {
name := getName(request)
content := request.FormValue("content")
if runtime.GOOS != "windows" {
// Remove carriage returns
content = strings.ReplaceAll(content, "\r", "")
}
page := &Page{Name: name, Content: []byte(content)}
err := page.save()
if err != nil {
http.Error(writer, err.Error(), http.StatusInternalServerError)
return
}
updatePageCache(page)
if name == mainMenuName {
mainMenu = getMainMenu()
}
http.Redirect(writer, request, "/pages/"+name, http.StatusFound)
}
func redirectToHomeHandler(writer http.ResponseWriter, request *http.Request) {
http.Redirect(writer, request, "/pages/Home", http.StatusFound)
}