download-once-as ( url path -- path )
HTTP Download Utilities

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Vocabulary
http.download

Inputs

url	an url or a string
path	a pathname string

Outputs

path	a pathname string

Word description
If the file exists on disk, returns that pathname without downloading anything. Otherwise, downloads the contents of the URL to a file with the given pathname and returns the pathname.

Notes
Use this if the contents of the URL are not expected to change.

Errors
Throws an error if the HTTP request fails.

Definition

USING: io.files kernel ;

IN: http.download

: download-once-as ( url path -- path )
    dup file-exists? [ nip ] [ download-as ] if ;