change vimeo & youtube embed plugins & README plugin list

Author: JohannesKaufmann

Diff for: README.md

@@ -103,6 +103,32 @@ converter.Use(plugin.Strikethrough(""))
 
 For more information have a look at the example [github_flavored](/examples/github_flavored/main.go).
 
+---
+
+These are the plugins located in the [plugin folder](/plugin) which you can use by importing "github.com/JohannesKaufmann/html-to-markdown/plugin".
+
+| Name                  | Description                                                                                 |
+| --------------------- | ------------------------------------------------------------------------------------------- |
+| GitHubFlavored        | GitHub's Flavored Markdown contains `TaskListItems`, `Strikethrough` and `Table`.           |
+| TaskListItems         | (Included in `GitHubFlavored`). Converts `<input>` checkboxes into `- [x] Task`.            |
+| Strikethrough         | (Included in `GitHubFlavored`). Converts `<strike>`, `<s>`, and `<del>` to the `~~` syntax. |
+| Table                 | (Included in `GitHubFlavored`). Convert a `<table>` into something like this...             |
+| TableCompat           |                                                                                             |
+|                       |                                                                                             |
+| VimeoEmbed            |                                                                                             |
+| YoutubeEmbed          |                                                                                             |
+|                       |                                                                                             |
+| ConfluenceCodeBlock   | Converts `<ac:structured-macro>` elements that are used in Atlassian’s Wiki "Confluence".   |
+| ConfluenceAttachments | Converts `<ri:attachment ri:filename=""/>` elements.                                        |
+
+These are the plugins in other repositories:
+
+| Name                         | Description         |
+| ---------------------------- | ------------------- |
+| \[Plugin Name\]\(Your Link\) | A short description |
+
+I you write a plugin, feel free to open a PR that adds your Plugin to this list.
+
 ## Writing Plugins
 
 Have a look at the [plugin folder](/plugin) for a reference implementation. The most basic one is [Strikethrough](/plugin/strikethrough.go).

Diff for: plugin/vimeo.go renamed to plugin/iframe_vimeo.go

@@ -54,9 +54,9 @@ const (
 	VimeoWithDescription
 )
 
-// EXPERIMENTALVimeoEmbed registers a rule (for iframes) and
+// VimeoEmbed registers a rule (for iframes) and
 // returns a markdown compatible representation (link to video, ...).
-func EXPERIMENTALVimeoEmbed(variation vimeoVariation) md.Plugin {
+func VimeoEmbed(variation vimeoVariation) md.Plugin {
 	return func(c *md.Converter) []md.Rule {
 		getVimeoData := func(id string) (*vimeoVideo, error) {
 			u := fmt.Sprintf("http://vimeo.com/api/oembed.json?url=https://vimeo.com/%s", id)

Diff for: plugin/iframe_youtube.go

@@ -0,0 +1,40 @@
+package plugin
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+
+	md "github.com/JohannesKaufmann/html-to-markdown"
+	"github.com/PuerkitoBio/goquery"
+)
+
+var youtubeID = regexp.MustCompile(`youtube\.com\/embed\/([^\&\?\/]+)`)
+
+// YoutubeEmbed registers a rule (for iframes) and
+// returns a markdown compatible representation (link to video, ...).
+func YoutubeEmbed() md.Plugin {
+	return func(c *md.Converter) []md.Rule {
+		return []md.Rule{
+			{
+				Filter: []string{"iframe"},
+				Replacement: func(content string, selec *goquery.Selection, opt *md.Options) *string {
+					src := selec.AttrOr("src", "")
+					if !strings.Contains(src, "youtube.com") {
+						return nil
+					}
+					alt := selec.AttrOr("title", "")
+
+					parts := youtubeID.FindStringSubmatch(src)
+					if len(parts) != 2 {
+						return nil
+					}
+					id := parts[1]
+
+					text := fmt.Sprintf("[![%s](https://img.youtube.com/vi/%s/0.jpg)](https://www.youtube.com/watch?v=%s)", alt, id, id)
+					return &text
+				},
+			},
+		}
+	}
+}

Diff for: plugin/table.go

@@ -8,7 +8,7 @@ import (
 	"github.com/PuerkitoBio/goquery"
 )
 
-// TableCompat is a compatibility plugon for environments where
+// TableCompat is a compatibility plugin for environments where
 // only commonmark markdown (without Tables) is supported.
 //
 // Note: In an environment that supports "real" Tables, like GitHub's Flavored Markdown
@@ -132,10 +132,10 @@ func Table() md.Plugin {
 }
 
 // A tr is a heading row if:
-// - the parent is a THEAD
-// - or if its the first child of the TABLE or the first TBODY (possibly
-//   following a blank THEAD)
-// - and every cell is a TH
+//   - the parent is a THEAD
+//   - or if its the first child of the TABLE or the first TBODY (possibly
+//     following a blank THEAD)
+//   - and every cell is a TH
 func isHeadingRow(s *goquery.Selection) bool {
 	parent := s.Parent()