Komosa/htmlize.go

## htmlize.go
package main

import (
	"errors"
	"fmt"
	"html/template"
	"io"
	"os"
	"strings"
)

type Meta struct {
	Analytics string // google analytics id, could be empty
	Disqus    string // disqus id, could be empty

	Title      string // title of current article
	Prev, Next string // titles of prev and next articles, should HrefFor() to articles, could be empty

	Tags []string // list of tags, should HrefFor() to post listings

	HrefFor func(string) string // translate title or tag into URL
}

func (meta Meta) Htmlize(content io.Reader, out io.Writer) error {
	if meta.HrefFor == nil {
		return errors.New(`Meta.HrefFor() is nil`)
	}

	err := template.Must(template.New("header").Parse(Header)).Execute(out, meta)
	if err != nil {
		return err
	}

	_, err = io.Copy(out, content)
	if err != nil {
		return err
	}

	return template.Must(template.New("nav").Funcs(map[string]interface{}{"hreffor": meta.HrefFor}).
		Parse(Footer)).Execute(out, meta)
}

func run() error {
	return Meta{
		Title:   "example blog post",
		HrefFor: func(title string) string { return strings.Replace(title, " ", "-", -1) },
		Tags:    []string{"t1", "hasztag dwa"},
	}.Htmlize(strings.NewReader(`<h1>foo</h1>bar`), os.Stdout)
}

func main() {
	err := run()
	if err == nil {
		return
	}
	fmt.Fprintf(os.Stderr, "%s\n", err)
	os.Exit(1)
}

//~ `UA-92786202-1`
//~ pkomosa
const Header = `<!DOCTYPE html><html lang=pl><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1">
<title>{{.Title}}</title>
<style>img{max-width:100%;height:auto}pre{max-width:100%;height:auto;white-space:pre-wrap}.navi href{flex-grow:1}
.navi{display:flex;flex-direction:row;justify-content:space-between;padding-bottom:.5em;font-style:italic}</style>
{{with .Analytics}}<script> window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};
	ga.l=+new Date; ga('create', '{{.}}', 'auto'); ga('send', 'pageview'); </script>
<script async src='//www.google-analytics.com/analytics.js'></script>{{end}}
{{with .Disqus}}<script async src='//{{.}}.disqus.com/embed.js>'</script>{{end}}
</head><body><strong>{{.Title}}</strong><hr>
`

const Footer = `<hr>{{if or .Prev .Next}}<div class=navi>
{{with .Prev}}<a href={{hreffor .}}>← {{.}}</a>{{end}}
{{with .Next}}<a href={{hreffor .}}>{{.}} →</a>{{end}}
</div>{{end}}
{{with .Tags}}<footer><div class=navi>
{{range .}}<a href={{hreffor .}}>#{{.}}</a>{{end}}
</footer></div>{{end}}
`
	package main

	import (
	"errors"
	"fmt"
	"html/template"
	"io"
	"os"
	"strings"
	)

	type Meta struct {
	Analytics string // google analytics id, could be empty
	Disqus string // disqus id, could be empty

	Title string // title of current article
	Prev, Next string // titles of prev and next articles, should HrefFor() to articles, could be empty

	Tags []string // list of tags, should HrefFor() to post listings

	HrefFor func(string) string // translate title or tag into URL
	}

	func (meta Meta) Htmlize(content io.Reader, out io.Writer) error {
	if meta.HrefFor == nil {
	return errors.New(`Meta.HrefFor() is nil`)
	}

	err := template.Must(template.New("header").Parse(Header)).Execute(out, meta)
	if err != nil {
	return err
	}

	_, err = io.Copy(out, content)
	if err != nil {
	return err
	}

	return template.Must(template.New("nav").Funcs(map[string]interface{}{"hreffor": meta.HrefFor}).
	Parse(Footer)).Execute(out, meta)
	}

	func run() error {
	return Meta{
	Title: "example blog post",
	HrefFor: func(title string) string { return strings.Replace(title, " ", "-", -1) },
	Tags: []string{"t1", "hasztag dwa"},
	}.Htmlize(strings.NewReader(`<h1>foo</h1>bar`), os.Stdout)
	}

	func main() {
	err := run()
	if err == nil {
	return
	}
	fmt.Fprintf(os.Stderr, "%s\n", err)
	os.Exit(1)
	}

	//~ `UA-92786202-1`
	//~ pkomosa
	const Header = `<!DOCTYPE html><html lang=pl><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1">
	<title>{{.Title}}</title>
	<style>img{max-width:100%;height:auto}pre{max-width:100%;height:auto;white-space:pre-wrap}.navi href{flex-grow:1}
	.navi{display:flex;flex-direction:row;justify-content:space-between;padding-bottom:.5em;font-style:italic}</style>
	{{with .Analytics}}<script> window.ga=window.ga\|\|function(){(ga.q=ga.q\|\|[]).push(arguments)};
	ga.l=+new Date; ga('create', '{{.}}', 'auto'); ga('send', 'pageview'); </script>
	<script async src='//www.google-analytics.com/analytics.js'></script>{{end}}
	{{with .Disqus}}<script async src='//{{.}}.disqus.com/embed.js>'</script>{{end}}
	</head><body><strong>{{.Title}}</strong><hr>
	`

	const Footer = `<hr>{{if or .Prev .Next}}<div class=navi>
	{{with .Prev}}<a href={{hreffor .}}>← {{.}}</a>{{end}}
	{{with .Next}}<a href={{hreffor .}}>{{.}} →</a>{{end}}
	</div>{{end}}
	{{with .Tags}}<footer><div class=navi>
	{{range .}}<a href={{hreffor .}}>#{{.}}</a>{{end}}
	</footer></div>{{end}}
	`