If STORE-PATH is the file name of a store entry, return an abbreviation of STORE-PATH for display, showing PREFIX-LENGTH characters of the hash. Otherwise return STORE-PATH.

Like 'open-socket-for-uri', but also handle HTTPS connections. When VERIFY-CERTIFICATE? is true, verify HTTPS server certificates.

Fetch FILE from URL; URL may be either a single string, or a list of string denoting alternate URLs for FILE. Return #f on failure, and FILE on success.

When MIRRORS is defined, it must be an alist of mirrors; it is used to resolve 'mirror://' URIs.

HASHES must be a list of algorithm/hash pairs, where each algorithm is a symbol such as 'sha256 and each hash is a bytevector. CONTENT-ADDRESSED-MIRRORS must be a list of procedures that, given a hash algorithm and a hash, return a URL where the specified data can be retrieved or #f.

When VERIFY-CERTIFICATE? is true, validate HTTPS server certificates; otherwise simply ignore them.

Abbreviate URI, which is assumed to be the URI of a nar as served by Hydra and 'guix publish', something like "http://example.org/nar/1ldrllwbna0aw5z8kpci4fsvbd2w8cw4-texlive-bin-2015".

Return an input port containing the data at URI, and the expected number of bytes available or #f. When TIMEOUT is true, bail out if the connection could not be established in less than TIMEOUT seconds. When VERIFY-CERTIFICATE? is true, verify HTTPS certificates; otherwise simply ignore them.

If URI uses the 'mirror' scheme, expand it according to the MIRRORS alist. Return a list of URIs.

Resolve the URI reference REF, interpreted relative to the BASE URI, into a target URI, according to the algorithm specified in RFC 3986 section 5.2.2. Return the resulting target URI.

Build the given DUB package, applying all of PHASES in order.

Build the given package, applying all of PHASES in order.

Builds the given Elm project, applying all of the PHASES in order.

Rewrites the "elm.json" file in the working directory---which must be of `"type":"application"`, not `"type":"package"`---to refer to the dependency versions actually provided via Guix. The GUIX_ELM_OFFLINE_REGISTRY_FILE environment variable is used to find available versions.

Work around a bug in the Elm compiler's JSON parser by attempting to replace REVERSE-SOLIDUS--SOLIDUS escape sequences in FILE with unescaped SOLIDUS characters.

Return a vhash mapping Elm "package" names to lists of available version strings.

Build the given Emacs package, applying all of PHASES in order.

Given the store directory STORE-DIR return the absolute install directory for libraries following the ELPA convention.