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Add htmlEscape and htmlUnescape template functions

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These functions allow trivial escaping and unescaping of HTML entities,
and make it far easier to compose other functions for the creation of
parameterised URLs.
This commit is contained in:
Cathal Garvey 2016-07-18 23:14:05 +01:00 committed by Bjørn Erik Pedersen
parent 7dd5cd675a
commit 20555b1630
3 changed files with 53 additions and 0 deletions
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21
docs/content/templates/functions.md
View file

@ -448,6 +448,27 @@ e.g. `{{ "I :heart: Hugo" | emojify }}`
Takes a string of code and a language, uses Pygments to return the syntax highlighted code in HTML.
Used in the [highlight shortcode](/extras/highlighting/).
### htmlEscape
HtmlEscape returns the given string with the critical reserved HTML codes escaped,
such that `&` becomes `&amp;` and so on. It escapes only: `<`, `>`, `&`, `'` and `"`.
Bear in mind that, unless content is passed to `safeHTML`, output strings are escaped
usually by the processor anyway.
e.g.
`{{ htmlEscape "Hugo & Caddy > Wordpress & Apache" }} → "Hugo &amp; Caddy &gt; Wordpress &amp; Apache"`
### htmlUnescape
HtmlUnescape returns the given string with html escape codes un-escaped. This
un-escapes more codes than `htmlEscape` escapes, including `#` codes and pre-UTF8
escapes for accented characters. It defers completely to the Go `html.UnescapeString`
function, so functionality is consistent with that codebase.
Remember to pass the output of this to `safeHTML` if fully unescaped characters
are desired, or the output will be escaped again as normal.
e.g.
`{{ htmlUnescape "Hugo &amp; Caddy &gt; Wordpress &amp; Apache" }} → "Hugo & Caddy > Wordpress & Apache"`
### humanize
Humanize returns the humanized version of an argument with the first letter capitalized.

18
tpl/template_funcs.go
View file

@ -1775,6 +1775,22 @@ func querify(params ...interface{}) (string, error) {
return qs.Encode(), nil
}
func htmlEscape(in interface{}) (string, error) {
conv, err := cast.ToStringE(in)
if err != nil {
return "", err
}
return html.EscapeString(conv), nil
}
func htmlUnescape(in interface{}) (string, error) {
conv, err := cast.ToStringE(in)
if err != nil {
return "", err
}
return html.UnescapeString(conv), nil
}
func init() {
funcMap = template.FuncMap{
"absURL": func(a string) template.HTML { return template.HTML(helpers.AbsURL(a)) },
@ -1803,6 +1819,8 @@ func init() {
"gt": gt,
"hasPrefix": func(a, b string) bool { return strings.HasPrefix(a, b) },
"highlight": highlight,
"htmlEscape": htmlEscape,
"htmlUnescape": htmlUnescape,
"humanize": humanize,
"in": in,
"index": index,

14
tpl/template_funcs_test.go
View file

@ -93,6 +93,13 @@ eq: {{ if eq .Section "blog" }}current{{ end }}
findRE: {{ findRE "[G|g]o" "Hugo is a static side generator written in Go." 1 }}
hasPrefix 1: {{ hasPrefix "Hugo" "Hu" }}
hasPrefix 2: {{ hasPrefix "Hugo" "Fu" }}
htmlEscape 1: {{ htmlEscape "Cathal Garvey & The Sunshine Band <cathal@foo.bar>" | safeHTML}}
htmlEscape 2: {{ htmlEscape "Cathal Garvey & The Sunshine Band <cathal@foo.bar>"}}
htmlUnescape 1: {{htmlUnescape "Cathal Garvey &amp; The Sunshine Band &lt;cathal@foo.bar&gt;" | safeHTML}}
htmlUnescape 2: {{"Cathal Garvey &amp;amp; The Sunshine Band &amp;lt;cathal@foo.bar&amp;gt;" | htmlUnescape | htmlUnescape | safeHTML}}
htmlUnescape 3: {{"Cathal Garvey &amp;amp; The Sunshine Band &amp;lt;cathal@foo.bar&amp;gt;" | htmlUnescape | htmlUnescape }}
htmlUnescape 4: {{ htmlEscape "Cathal Garvey & The Sunshine Band <cathal@foo.bar>" | htmlUnescape | safeHTML }}
htmlUnescape 5: {{ htmlUnescape "Cathal Garvey &amp; The Sunshine Band &lt;cathal@foo.bar&gt;" | htmlEscape | safeHTML }}
humanize 1: {{ humanize "my-first-post" }}
humanize 2: {{ humanize "myCamelPost" }}
humanize 3: {{ humanize "52" }}
@ -149,6 +156,13 @@ eq: current
findRE: [go]
hasPrefix 1: true
hasPrefix 2: false
htmlEscape 1: Cathal Garvey &amp; The Sunshine Band &lt;cathal@foo.bar&gt;
htmlEscape 2: Cathal Garvey &amp;amp; The Sunshine Band &amp;lt;cathal@foo.bar&amp;gt;
htmlUnescape 1: Cathal Garvey & The Sunshine Band <cathal@foo.bar>
htmlUnescape 2: Cathal Garvey & The Sunshine Band <cathal@foo.bar>
htmlUnescape 3: Cathal Garvey &amp; The Sunshine Band &lt;cathal@foo.bar&gt;
htmlUnescape 4: Cathal Garvey & The Sunshine Band <cathal@foo.bar>
htmlUnescape 5: Cathal Garvey &amp; The Sunshine Band &lt;cathal@foo.bar&gt;
humanize 1: My first post
humanize 2: My camel post
humanize 3: 52nd