guix package: Remove leftover internal procedure.

Reported by Alex Kost <alezost@gmail.com>.

* guix/scripts/package.scm (guix-package)[process-actions]: Remove
  'same-package?'.

guix package: Use 'manifest-add'.

* guix/scripts/package.scm (guix-package)[process-actions]: Use
  'manifest-add' instead of the equivalent code.

guix package: Remove dead code and unused variables.

Suggested by Alex Kost <alezost@gmail.com>.

* guix/scripts/package.scm (options->installable)[deduplicate]: Remove.
  [packages-to-upgrade]: Remove unused variable 'newest'.
  (roll-back): Remove unused variable 'manifest'.
  (guix-package): Remove unused variables 'guile-missing?', 'verbose?',
  and 'packages'.

profiles: Add 'package->manifest-entry'.

Suggested by Alex Kost <alezost@gmail.com>.

* guix/scripts/package.scm (options->installable)[package->manifest-entry]:
  Move to (guix profiles).
  [package->manifest-entry*]: New procedure.
  Use it.
* guix/profiles.scm (package->manifest-entry): New procedure.
* tests/profiles.scm (guile-for-build): New variable.
  Call '%guile-for-build'.
  ("profile-derivation"): New test.

profiles: Get rid of the 'inputs' field of 'manifest-entry'.

* guix/profiles.scm (<manifest-entry>)[inputs]: Remove.
  (profile-derivation): Rely on 'item' and 'deps' instead of 'inputs'.
  Adjust 'builder' accordingly.
* guix/scripts/package.scm (options->installable)[package->manifest-entry]:
  Remove 'inputs' field.  Change 'dependencies' field to contain
  packages.

profiles: Switch to gexps.

* guix/profiles.scm (<manifest-entry>)[path]: Rename to...
  [item]: ... this.  Update users.
  (manifest->sexp): Rename to...
  (manifest->gexp): ... this.  Return a gexp.
  (lower-input): Remove.
  (profile-derivation): Remove 'store' parameter, and turn into a
  monadic procedure.
  [inputs]: New variable.
  [builder]: Turn into a gexp.
  Replace call to 'build-expression->derivation' with call to
  'gexp->derivation'.
* guix/scripts/package.scm (link-to-empty-profile): Adjust call to
  'profile-derivation', and wrap it in 'run-with-store'.
  (show-what-to-remove/install): Rename 'path' to 'item'.  Check whether
  ITEM is a package, and return its output path if it is.
  (input->name+path): Remove.
  (options->installable): Set 'item' to P.
  (guix-package): Adjust call to 'profile-derivation'.
* tests/profiles.scm (guile-2.0.9): Change 'path' to 'item'.

profiles: Do away with 'manifest=?'.

* guix/profiles.scm (manifest=?): Remove.
* guix/scripts/package.scm (readlink*): New procedure.
  (guix-package)[process-actions]: Use 'readlink*' and compare the
  profile to be built, PROF, with PROFILE to determine whether there's
  nothing to be done.

guix package: add a "show" option.

* doc/guix.texi: Update the documentation.
* guix/scripts/package.scm: Add a "show" option.
* tests/guix-package.sh: Add a test for the "show" option.

guix package: Try $LOGNAME in addition to $USER.

Fixes <http://bugs.gnu.org/17946>.

Notoriously, cron jobs may set LOGNAME only and not USER.  See
e.g. crontab(5) under Debian 7 (wheezy).

* guix/scripts/package.scm (%profile-directory)
(guix-package): Also try LOGNAME if USER is unset.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

guix package: Do the right thing for '-p ~/.guix-profile'.

Fixes <http://bugs.gnu.org/17939>.
Reported by Taylan Ulrich Bayirli/Kammer <taylanbayirli@gmail.com>.

* guix/scripts/package.scm (canonicalize-profile): New procedure.
  (%options): Use it for --profile.
* tests/guix-package.sh: Add test.

Merge branch 'master' into core-updates

Separate package description translations from string translations.

* po/packages/LINGUAS, po/packages/Makevars, po/packages/POTFILES.in:
  New files.
* po/guix/Makevars (DOMAIN): Change to "guix".
  (XGETTEXT_OPTIONS): Remove "--keyword=synopsis --keyword=description".
* po/guix/POTFILES.in: Remove gnu/packages/*.scm.
* configure.ac: Change to gettext 0.18.3.  Produce
  po/packages/Makefile.in.
* Makefile.am (SUBDIRS): Add po/packages.
* guix/ui.scm (%package-text-domain): New variable.
  (P_): New procedure.
  (package->recutils): Use 'P_' instead of '_'.
* guix/scripts/package.scm (find-packages-by-description): Use 'P_'
  instead of 'gettext'.

guix package: Fix indentation of packages to remove.

* guix/scripts/package.scm (show-what-to-remove/install): Add space when
  showing packages to remove.

guix package: 'search-path-environment-variables' traverses module tree once.

* guix/scripts/package.scm (search-path-environment-variables)[manifest-entry->package]:
  Use 'find-best-packages-by-name' instead of 'find-packages-by-name'.
  On a profile with 140 packages, this reduces execution time of this
  procedure from 5.8 seconds to 2.9 seconds (50% improvement.)

guix package: Register non-default profiles as GC roots.

* guix/scripts/package.scm (maybe-register-gc-root): New procedure.
* tests/guix-package.sh (profile): Grep the output of "guix gc
  --list-live" in a couple of places.

Merge branch 'master' into core-updates

guix package: Use the common build options from (guix scripts build).

* guix/scripts/build.scm (%standard-build-options): Change option
  handlers to support multiple seeds.
* guix/scripts/package.scm (show-help): Remove --dry-run, --fallback,
  --no-substitutes, and --max-silent-time.
  (%options): Likewise, and add %STANDARD-BUILD-OPTIONS.
  (%default-options): Add 'verbosity'.
  (guix-package): Call 'set-build-options-from-command-line' instead of
  'set-build-options'.

Merge branch 'master' into core-updates

guix package: Gracefully handle EPIPE on '--search'.

* guix/scripts/package.scm (guix-package): Wrap body of 'search' in
  'leave-on-EPIPE'.

Merge branch 'master' into core-updates