Add url encoding functions

[nyurik]

I was trying to use curl from just:

upload credentials file:
   curl '-u{{credentials}}' -T {{quote(file)}} 'https://example.com/foo/bar/{{file_name(file)}}'

and this worked fine until the filename had a # character - which broke the above because i was not URL-encoding it. I think just could use a url encoding function to handle such cases

[casey]

Seems reasonable to me! Maybe url_encode(STRING). This would make a great first PR for anyone who wants to take a crack at it.

[laniakea64]

"URL encoding" can have several different meanings, e.g.

• percent-encoding some characters, like Javascript encodeURI
• percent-encoding most characters, notably including characters that have meaning in a URL, like Javascript encodeURIComponent
• the encoding that replaces some whitespace characters with + and does percent-encoding in some other cases, like seen in search engine search URLs
• base64
• ...

Guessing from the example case, you're seeking encodeURIComponent-like encoding?

[nyurik]

agree, url encoding has a number of different usecases, so it might be useful to provide more than one function. For my usecase, encodeURIComponent is enough. I do not know how common are other usecases - I haven't encountered them (yet)