guix-package: Make `--search' queries case-insensitive.

* guix-package.in (guix-package)[process-query]: Use `regexp/icase' for
  the `search' regexp.

Augment `.dir-locals.el'.

* .dir-locals.el: Add more Scheme settings.
* guix-build.in, tests/base32.scm, tests/build-utils.scm,
  tests/builders.scm, tests/derivations.scm, tests/packages.scm,
  tests/snix.scm, tests/store.scm, tests/union.scm, tests/utils.scm:
  Remove redundant Emacs local variable settings.

guix-package: Report `--search' matches in recutils format.

* guix/ui.scm (fill-paragraph, string->recutils, package->recutils): New
  procedures.
* guix-package.in (guix-package)[process-query]: Use `package->recutils'
  to display package meta-data.
* tests/guix-package.sh: Adjust test.
* tests/ui.scm: New file.
* Makefile.am (TESTS): Add it.
* doc/guix.texi (Invoking guix-package): Adjust `--search'
  documentation, and give an example.

guix-package: Gracefully report non-existing outputs.

* guix-package.in (guix-package)[find-package](ensure-output): New
  procedure. Use it to validate SUB-DRV.

guix-package: Reduce start-up time for queries.

* guix-package.in (guix-package): Call `open-connection' and
  `package-derivation' only after `process-query' has returned.

gnu: Add libkate.

* gnu/packages/oggvorbis.scm (libkate): New variable.
* gnu/packages/oggvorbis.scm (vorbis-tools): Add input libkate.

gnu: Add flac.

* gnu/packages/oggvorbis.scm (flac): New variable.
* gnu/packages/oggvorbis.scm (vorbis-tools): Add flac input.
* gnu/packages/patches/flac-fix-memcmp-not-declared.patch: New file.

gnu: bigloo: Update tarball's hash.

* gnu/packages/scheme.scm (bigloo): Change hash.  The tarball was
  recently modified in-place (!).

store: Don't expect build logs to be UTF-8-encoded.

* guix/store.scm (read-latin1-string): New procedure.
  (process-stderr): Use it instead of `read-string'.
  Reported by Andreas Enge <andreas@enge.fr>.

gnu: vorbis-tools: Enable ogg123.

* gnu/packages/oggvorbis.scm (vorbis-tools): Add inputs ao and curl.

gnu: Add libao.

* gnu/packages/oggvorbis.scm (ao): New variable.

gnu: Add curl.

* gnu/packages/curl.scm: New file.
* Makefile.am (MODULES): Add it.

gnu: Add openssh.

* gnu/packages/ssh.cm (openssh): New variable.

.dir-locals.el: Fill at 78 columns.

derivations: Memoize `read-derivation'.

* guix/derivations.scm (read-derivation): Rename to...
  (%read-derivation): ... this.
  (read-derivation): New procedure.
  This reduces the execution of "guix-build gdb" from 2.5s to 1.7s.

store: Slightly improve memoization hashing.

* guix/store.scm (open-connection): Call `make-hash-table' with 100.
  (add-text-to-store): Move TEXT first in ARGS, for better `hash'
  results.
  (add-to-store): Likewise, move ST first.

store: Remove the `fixed?' parameter from `add-to-store'.

* guix/store.scm (add-to-store): Remove the `fixed?' parameter from the
  public interface.
* gnu/packages/bootstrap.scm, guix-download.in, guix/derivations.scm,
  guix/packages.scm, tests/derivations.scm: Update all callers
  accordingly.

store: Avoid use of `set!'.

* guix/store.scm (operation): New macro.
  (define-operation): Define in terms of `operation'.
  (add-text-to-store): Define using `operation', and remove now
  unnecessary `set!'.
  (add-to-store): Likewise.
  (add-text-to-store/cached, add-to-store/cached): Remove.

store: Micro-optimize `write-string'.

* guix/store.scm (write-string): Optimize to write the length, contents,
  and padding all at once.  This yields a 2% improvement on the
  execution time of "guix-build gdb".

Gracefully handle failure to install the current locale.

* guix/ui.scm (install-locale): New procedure.
* guix-build.in, guix-download.in, guix-gc.in, guix-import.in,
  guix-package.in: Use it instead of (setlocale LC_ALL "").