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everal times if several variables were bound to it, as is notably the case for "python" currently. This, in turn, would lead to obnoxious "ambiguous package specification" messages. * gnu/packages.scm (generate-package-cache)[expand-cache]: Change RESULT to RESULT+SEEN and adjust accordingly. Call 'first' on the result of 'fold-module-public-variables*'. * tests/packages.scm ("fold-available-packages with/without cache"): Check for lack of duplicates in FROM-CACHE. Ludovic Courtès 2019-01-15guix package: '--list-available' can use data from the cache....* gnu/packages.scm (fold-available-packages): New procedure. * guix/scripts/package.scm (process-query): Use it instead of 'fold-packages'. * tests/packages.scm ("fold-available-packages with/without cache"): New test. Ludovic Courtès 2019-01-15edit: Use 'specification->location' to read information from the cache....That way 'guix edit' doesn't need to load any package module. * gnu/packages.scm (find-package-locations, specification->location): New procedures. * guix/scripts/edit.scm (package->location-specification): Rename to... (location->location-specification): ... this. Expect a location object instead of a package. (guix-edit): Use 'specification->location' instead of 'specification->package'. * tests/packages.scm ("find-package-locations") ("find-package-locations with cache") ("specification->location"): New tests. Ludovic Courtès 2019-01-15channels: Compute a package cache and use it....* gnu/packages.scm (cache-is-authoritative?, load-package-cache) (cache-lookup, generate-package-cache): New procedures. (%package-cache-file): New variable. (find-packages-by-name): Rename to... (find-packages-by-name/direct): ... this. (find-packages-by-name): Rewrite to use the package cache when 'cache-is-authoritative?' returns true. * tests/packages.scm ("find-packages-by-name + version, with cache") ("find-packages-by-name with cache"): New tests. * guix/channels.scm (package-cache-file): New procedure. (%channel-profile-hooks): New variable. (channel-instances->derivation): Use it in #:hooks. * guix/scripts/package.scm (build-and-use-profile): Add #:hooks and honor it. * guix/scripts/pull.scm (build-and-install): Pass #:hooks to UPDATE-PROFILE. Ludovic Courtès 2019-01-15packages: Remove 'find-newest-available-packages'....Since commit 9ffc1c00e55eb7931846dbb3fafcf54716fff57c, 'find-newest-available-packages' and 'find-packages-by-name' were both building a vhash mapping package names to packages. This factorizes this bit, also reducing I/O, CPU, and memory usage. * gnu/packages.scm (find-best-packages-by-name): Remove. (find-best-packages-by-name): Use 'find-packages-by-name' instead of 'find-newest-available-packages'. Ludovic Courtès 2018-09-02Add (guix describe) and use it to initialize '%package-search-path'....* guix/describe.scm: New file. * Makefile.am (MODULES): Add it. * gnu/packages.scm (%default-package-module-path): New variable. (%package-module-path): Honor 'package-path-entries'. * build-aux/update-NEWS.scm (main): Use %DEFAULT-PACKAGE-MODULE-PATH instead of (last (%package-module-path)). Ludovic Courtès 2018-05-13packages: 'find-packages-by-name' properly honors version prefixes....Fixes <https://bugs.gnu.org/28446>. Reported by Mark H Weaver <mhw@netris.org>. * gnu/packages.scm (find-packages-by-name): Use 'version-prefix?' instead of 'string-prefix?'. Ludovic Courtès 2018-04-08discovery: Remove dependency on (guix ui)....This reduces the closure of (guix discovery) from 28 to 8 modules. * guix/discovery.scm (scheme-files): Use 'format' instead of 'warning'. (scheme-modules): Add #:warn parameter. Use it instead of 'warn-about-load-error'. (fold-modules): Add #:warn and pass it to 'scheme-modules'. (all-modules): Likewise. * gnu/bootloader.scm (bootloader-modules): Pass #:warn to 'all-modules'. * gnu/packages.scm (fold-packages): Likewise. * gnu/services.scm (all-service-modules): Likewise. * guix/upstream.scm (importer-modules): Likewise. Ludovic Courtès 2018-04-08Add (guix self)....* guix/self.scm: New file. * Makefile.am (MODULES): Add it. * gnu/packages.scm (%distro-root-directory): Rewrite to try different directories. * guix/discovery.scm (guix): Export 'scheme-files'. Ludovic Courtès 2017-11-07packages: 'fold-packages' takes #:select? parameter....* gnu/packages.scm (fold-packages): Add #:select? parameter and honor it. Ludovic Courtès 2017-09-01packages: 'fold-packages' takes an optional 'modules' parameter....Suggested by Christopher Baines <mail@cbaines.net>. * gnu/packages.scm (fold-packages): Add optional 'modules' parameter and honor it. Ludovic Courtès 2017-06-11packages: Add 'specifications->manifest'....* gnu/packages.scm (specifications->manifest): New procedure. * doc/guix.texi (Invoking guix package): Change example from using '(compose list specification->package+output)' to using 'specifications->manifest'. Ludovic Courtès 2017-05-03Add (guix discovery)....* guix/discovery.scm, tests/discovery.scm: New files. * gnu/packages.scm (scheme-files, file-name->module-name) (scheme-modules, all-package-modules): Remove. (fold-packages): Rewrite in terms of 'fold-module-public-variables'. * gnu/tests.scm: Use (guix discovery). * Makefile.am (MODULES): Add guix/discovery.scm. (SCM_TESTS): Add tests/discovery.scm. Ludovic Courtès 2017-05-03ui: Rename '_' to 'G_'....This avoids collisions with '_' when the latter is used as a 'match' pattern for instance. See <https://lists.gnu.org/archive/html/guix-devel/2017-04/msg00464.html>. * guix/ui.scm: Rename '_' to 'G_'. * po/guix/Makevars (XGETTEXT_OPTIONS): Adjust accordingly. * build-aux/compile-all.scm (warnings): Remove 'format'. * gnu/packages.scm, gnu/services.scm, gnu/services/shepherd.scm, gnu/system.scm, gnu/system/shadow.scm, guix/gnupg.scm, guix/http-client.scm, guix/import/cpan.scm, guix/import/elpa.scm, guix/import/pypi.scm, guix/nar.scm, guix/scripts.scm, guix/scripts/archive.scm, guix/scripts/authenticate.scm, guix/scripts/build.scm, guix/scripts/challenge.scm, guix/scripts/container.scm, guix/scripts/container/exec.scm, guix/scripts/copy.scm, guix/scripts/download.scm, guix/scripts/edit.scm, guix/scripts/environment.scm, guix/scripts/gc.scm, guix/scripts/graph.scm, guix/scripts/hash.scm, guix/scripts/import.scm, guix/scripts/import/cpan.scm, guix/scripts/import/cran.scm, guix/scripts/import/crate.scm, guix/scripts/import/elpa.scm, guix/scripts/import/gem.scm, guix/scripts/import/gnu.scm, guix/scripts/import/hackage.scm, guix/scripts/import/nix.scm, guix/scripts/import/pypi.scm, guix/scripts/import/stackage.scm, guix/scripts/lint.scm, guix/scripts/offload.scm, guix/scripts/pack.scm, guix/scripts/package.scm, guix/scripts/perform-download.scm, guix/scripts/publish.scm, guix/scripts/pull.scm, guix/scripts/refresh.scm, guix/scripts/size.scm, guix/scripts/substitute.scm, guix/scripts/system.scm, guix/ssh.scm, guix/upstream.scm: Use 'G_' instead of '_'. Most of this change was obtained by running: "sed -i -e's/(_ "/(G_ "/g' `find -name \*.scm`". Ludovic Courtès