ArgsParser will split a string by new words and quotes phrases.

CleanTag returns a clean tag, trimming whitespace and replacing invalid characters.

CreateSnippet returns a message snippet.

GetHTMLAttributeVal returns the value of an HTML Attribute, else an error.

InArray tests if a string is within an array.

IsDir returns whether a path is a directory.

IsFile returns whether a file exists and is readable.

ListUnsubscribeParser will attempt to parse a `List-Unsubscribe` header and return a slide of addresses (mail & URLs).

Normalize will remove any extra spaces, remove newlines, and trim leading and trailing spaces.

OverrideFromHeader scans a message for the From header and replaces it with a different email address.

Plural returns a singular or plural of a word together with the total.

PrepareSocket returns an error if an active socket file already exists.

RemoveMessageHeaders scans a message for headers, if found them removes them.

SetHTMLAttributeVal sets an attribute on a node.

SetMessageHeader scans a message for a header and updates its value if found.

SetTagCasing returns the slice of tags, title-casing if set.

UnixSocket returns a path and a FileMode if the address is in the format of unix:<path>:<permission>.

WalkHTML traverses the entire HTML tree and calls fn on each node.

TagsTitleCase enforces TitleCase on all tags.