diff -r d436b88d137b -r 7d712d2bde73 printer/html2text/html2text.go
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/printer/html2text/html2text.go	Fri May 12 23:31:21 2017 +0200
@@ -0,0 +1,148 @@
+// Copyright (c) 2015 Shawn Goertzen
+// Copyright (c) 2017 Mikael Berthe
+//
+// This code mostly comes from github.com/sgoertzen/html2text,
+// with some specific but intrusive changes for Mastodon HTML messages.
+// For example, links are not displayed for hashtags and mentions,
+// and links alone are displayed for the other cases.
+//
+// Licensed under the MIT license.
+// Please see the LICENSE file is this directory.
+
+package html2text
+
+import (
+	"bytes"
+	"errors"
+	"golang.org/x/net/html"
+	"strings"
+)
+
+var breakers = map[string]bool{
+	"br":  true,
+	"div": true,
+	"tr":  true,
+	"li":  true,
+	"p":   true,
+}
+
+// Textify turns an HTML body into a text string
+func Textify(body string) (string, error) {
+	r := strings.NewReader(body)
+	doc, err := html.Parse(r)
+	if err != nil {
+		return "", errors.New("unable to parse the html")
+	}
+	var buffer bytes.Buffer
+	process(doc, &buffer, "")
+
+	s := strings.TrimSpace(buffer.String())
+	return s, nil
+}
+
+func process(n *html.Node, b *bytes.Buffer, class string) {
+	processChildren := true
+
+	if n.Type == html.ElementNode && n.Data == "head" {
+		return
+	} else if n.Type == html.ElementNode && n.Data == "a" && n.FirstChild != nil {
+		anchor(n, b, class)
+		processChildren = false
+	} else if n.Type == html.TextNode {
+		// Clean up data
+		cleanData := strings.Replace(strings.Trim(n.Data, " \t"), "\u00a0", " ", -1)
+
+		// Heuristics to add a whitespace character...
+		var prevSpace, nextSpace bool // hint if previous/next char is a space
+		var last byte
+		bl := b.Len()
+		if bl > 0 {
+			last = b.Bytes()[bl-1]
+			if last == ' ' {
+				prevSpace = true
+			}
+		}
+		if len(cleanData) > 0 && cleanData[0] == ' ' {
+			nextSpace = true
+		}
+		if prevSpace && nextSpace {
+			b.WriteString(cleanData[1:]) // Trim 1 space
+		} else {
+			if bl > 0 && last != '\n' && last != '@' && last != '#' && !prevSpace && !nextSpace {
+				b.WriteString(" ")
+			}
+			b.WriteString(cleanData)
+		}
+	}
+
+	if processChildren {
+		var class string
+		if n.Type == html.ElementNode && n.Data == "span" {
+			for _, attr := range n.Attr {
+				if attr.Key == "class" {
+					class = attr.Val
+					break
+				}
+			}
+		}
+		for c := n.FirstChild; c != nil; c = c.NextSibling {
+			process(c, b, class)
+		}
+	}
+
+	if b.Len() > 0 {
+		bl := b.Len()
+		last := b.Bytes()[bl-1]
+		if last != '\n' && n.Type == html.ElementNode && breakers[n.Data] {
+			// Remove previous space
+			for last == ' ' {
+				bl--
+				b.Truncate(bl)
+				if bl > 0 {
+					last = b.Bytes()[bl-1]
+				} else {
+					last = '\x00'
+				}
+			}
+			b.WriteString("\n")
+		}
+	}
+}
+
+func anchor(n *html.Node, b *bytes.Buffer, class string) {
+	bl := b.Len()
+	var last byte
+	if bl > 0 {
+		last = b.Bytes()[bl-1]
+	}
+
+	var tmpbuf bytes.Buffer
+	for c := n.FirstChild; c != nil; c = c.NextSibling {
+		process(c, &tmpbuf, class)
+	}
+
+	if class == "tag" || class == "h-card" || last == '@' {
+		b.Write(tmpbuf.Bytes())
+		return
+	}
+
+	// Add heading space if needed
+	if last != ' ' && last != '\n' {
+		b.WriteString(" ")
+	}
+
+	s := tmpbuf.String()
+	if strings.HasPrefix(s, "#") || strings.HasPrefix(s, "@") {
+		b.WriteString(s) // Tag or mention: display content
+		return
+	}
+
+	// Display href link
+	for _, attr := range n.Attr {
+		if attr.Key == "href" {
+			link := n.Attr[0].Val
+			b.WriteString(link)
+			break
+		}
+	}
+}