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Add trim and replace template functions

--- a/docs/content/templates/functions.md

+++ b/docs/content/templates/functions.md

@@ -292,6 +292,16 @@

 e.g., `{{chomp "<p>Blockhead</p>\n"` → `"<p>Blockhead</p>"`

+### trim

+Trim returns a slice of the string with all leading and trailing characters contained in cutset removed.

+

+e.g. `{{ trim "++Batman--" "+-" }}` → "Batman"

+

+### replace

+Replace all occurences of the search string with the replacement string.

+

+e.g. `{{ replace "Batman and Robin" "Robin" "Catwoman" }}` → "Batman and Catwoman"

+

 ### highlight

 Take a string of code and a language, uses Pygments to return the syntax highlighted code in HTML. Used in the [highlight shortcode](/extras/highlighting).

--- a/tpl/template.go

+++ b/tpl/template.go

@@ -1237,6 +1237,8 @@

 		"relref":      RelRef,

 		"apply":       Apply,

 		"chomp":       Chomp,

+    "replace":     func(a string, b string, c string) string { return strings.Replace(a, b, c, -1) },

+    "trim":        func(a string, b string) string { return strings.Trim(a, b) },

 	}

 	chompRegexp = regexp.MustCompile("[\r\n]+$")