gnu-maintenance: Optimize `release-file'.

* guix/gnu-maintenance.scm (tarball-regexp): Remove.
  (%tarball-rx): New variable.
  (release-file): Adjust to use %TARBALL-RX.

gnu-maintenance: Optimize `latest-release'.

* guix/gnu-maintenance.scm (tarball-regexp, sans-extension,
  release-file): New procedures.
  (%alpha-tarball-rx): New variable.
  (releases): Use them instead of local copies.
  (latest-release): Rewrite to not do a recursive search of all
  versions and instead jump directly to the latest.

Add `guix refresh' and related auto-update tools.

* guix/gnu-maintenance.scm (ftp-server/directory)[quirks]: Add glib.
  (package-update-path, download-tarball, package-update,
  update-package-source): New procedures.
* guix/gnupg.scm, guix/scripts/refresh.scm: New files.
* Makefile.am (MODULES): Add them.
* guix/utils.scm (file-extension): New procedure.

packages: Use `read' and source properties for `package-field-location'.

* guix/packages.scm (package-field-location): Rewrite using `read' and
  source properties.  Change to return #f upon failure.
* tests/packages.scm ("package-field-location"): Check for #f upon failure.
* build-aux/sync-synopses.scm: Adjust accordingly.

utils: Fix column number returned by `source-properties->location'.

* guix/utils.scm (source-properties->location): Use COL, not COL + 1.

gnu: hop: Update hash to match hop-2.4.0.tar.gz, which was modified in place.

* gnu/packages/scheme.scm (hop): Update the hash.

packages: Add `package-field-location'.

* guix/packages.scm (package-field-location): New procedure.
* build-aux/sync-synopses.scm: Use it instead of `package-location'.
* tests/packages.scm ("package-field-location"): New test.

ui: Move macro definitions before any use.

* guix/ui.scm (define-diagnostic, warning, report-error, leave): Move
  definitions before any use.  Reported by Nikita Karetnikov.
  (install-locale): Move back close to `initialize-guix'.

gnu: xorriso: Update to 1.2.8.

* gnu/packages/cdrom.scm (xorriso): Update to 1.2.8.

gnu: smalltalk: Update to 3.2.5.

* gnu/packages/smalltalk.scm (smalltalk): Update to 3.2.5.

gnu: groff: Update to 1.22.2.

* gnu/packages/groff.scm (groff): Update to 1.22.2.

gnu: gprolog: Update to 1.4.3 and download from GNU mirrors

* gnu/packages/gprolog.scm (gprolog): Update to 1.4.3.
  Download from GNU mirrors.

Factorize `download-and-store'.

* guix/download.scm (download-to-store): New procedure.
* guix/scripts/download.scm (fetch-and-store): Remove.
  (guix-download): Use `download-to-store' instead.
* guix/ui.scm (call-with-temporary-output-file): Move to...
* guix/utils.scm (call-with-temporary-output-file): ... here.

Add 'guix hash'.

* guix/scripts/hash.scm: New file.
* Makefile.am (MODULES): Add it.
* po/POTFILES.in: Add it.
* doc/guix.texi (Invoking guix hash): New node.
  (Defining Packages): Add a cross-reference to the 'Invoking guix
  hash' node.

guix download: Add supported formats to '--help'.

* guix/scripts/download.scm (show-help): Add supported formats.

ui: Move definition of `install-locale' after that of the `warning' macro.

* guix/ui.scm (install-locale): Move definition after that of `warning'.

gnu: guile: Update to 2.0.9.

* gnu/packages/guile.scm (guile-2.0): Update to 2.0.9.
  (guile-2.0/fixed): Keep at 2.0.7.

ui: Add a 'define-diagnostic' macro.

* guix/ui.scm (define-diagnostic): New macro, which is based on the
  previous version of 'warning'.
  (warning, leave): Redefine using 'define-diagnostic'.
  (report-error): New macro.
  (install-locale): Use 'warning' instead of 'format'.
  (call-with-error-handling): Adjust 'leave'.
* gnu/packages.scm (package-files): Use 'warning' instead of 'format'.
* guix/gnu-maintenance.scm (http-fetch): Use 'warning' and 'leave'.
* guix/scripts/build.scm (derivations-from-package-expressions, guix-build):
  Adjust 'leave'.
* guix/scripts/download.scm (guix-download): Adjust 'leave'.
* guix/scripts/gc.scm (size->number, %options): Adjust 'leave'.
* guix/scripts/package.scm (roll-back, guix-package): Adjust 'leave'.
* po/POTFILES.in: Add 'guix/gnu-maintenance.scm'.

gnu: Add GCC 4.8.0 and Binutils 2.23.2.

* gnu/packages/base.scm (binutils-2.23, ld-wrapper-2.23, gcc-4.8): New
  variables.

substitute-binary: Remove expired cache entries once in a while.

* guix/scripts/substitute-binary.scm (%narinfo-expired-cache-entry-removal-delay):
  New variable.
  (obsolete?): New procedure, formerly in `lookup-narinfo'.
  (lookup-narinfo): Adjust accordingly.
  (remove-expired-cached-narinfos, maybe-remove-expired-cached-narinfo):
  New procedures.
  (guix-substitute-binary): Call `maybe-remove-expired-cached-narinfo'.