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2020-09-10scripts: Use 'define-command' and have 'guix help' use that....This changes 'guix help' to print a short synopsis for each command and to group commands by category. * guix/scripts.scm (synopsis, category): New variables. (define-command-categories, define-command): New macros. (%command-categories): New variable. * guix/ui.scm (<command>): New record type. (source-file-command): New procedure. (command-files): Return absolute file names. (commands): Return a list of <command> records. (show-guix-help)[display-commands, category-predicate]: New procedures. Display commands grouped in three categories. * guix/scripts/archive.scm (guix-archive): Use 'define-command'. * guix/scripts/authenticate.scm (guix-authenticate): Likewise. * guix/scripts/build.scm (guix-build): Likewise. * guix/scripts/challenge.scm (guix-challenge): Likewise. * guix/scripts/container.scm (guix-container): Likewise. * guix/scripts/copy.scm (guix-copy): Likewise. * guix/scripts/deploy.scm (guix-deploy): Likewise. * guix/scripts/describe.scm (guix-describe): Likewise. * guix/scripts/download.scm (guix-download): Likewise. * guix/scripts/edit.scm (guix-edit): Likewise. * guix/scripts/environment.scm (guix-environment): Likewise. * guix/scripts/gc.scm (guix-gc): Likewise. * guix/scripts/git.scm (guix-git): Likewise. * guix/scripts/graph.scm (guix-graph): Likewise. * guix/scripts/hash.scm (guix-hash): Likewise. * guix/scripts/import.scm (guix-import): Likewise. * guix/scripts/install.scm (guix-install): Likewise. * guix/scripts/lint.scm (guix-lint): Likewise. * guix/scripts/offload.scm (guix-offload): Likewise. * guix/scripts/pack.scm (guix-pack): Likewise. * guix/scripts/package.scm (guix-package): Likewise. * guix/scripts/perform-download.scm (guix-perform-download): Likewise. * guix/scripts/processes.scm (guix-processes): Likewise. * guix/scripts/publish.scm (guix-publish): Likewise. * guix/scripts/pull.scm (guix-pull): Likewise. * guix/scripts/refresh.scm (guix-refresh): Likewise. * guix/scripts/remove.scm (guix-remove): Likewise. * guix/scripts/repl.scm (guix-repl): Likewise. * guix/scripts/search.scm (guix-search): Likewise. * guix/scripts/show.scm (guix-show): Likewise. * guix/scripts/size.scm (guix-size): Likewise. * guix/scripts/substitute.scm (guix-substitute): Likewise. * guix/scripts/system.scm (guix-system): Likewise. * guix/scripts/time-machine.scm (guix-time-machine): Likewise. * guix/scripts/upgrade.scm (guix-upgrade): Likewise. * guix/scripts/weather.scm (guix-weather): Likewise. Ludovic Courtès
2020-07-27processes: Allow 'less' to properly estimate line length....Until now, the first few lines in the output of 'guix processes' could disappear in 'less'. * guix/ui.scm (call-with-paginated-output-port): Add #:less-options parameter and honor it. (with-paginated-output-port): Allow callers to pass #:less-options. * guix/scripts/processes.scm (guix-processes): Pass #:less-options to 'with-paginated-output-port'. Ludovic Courtès
2020-06-28processes: Write to $PAGER....* guix/ui.scm (with-paginated-output-port): Export. * guix/scripts/processes.scm (guix-processes): Use it instead of writing directly to (current-output-port). Ludovic Courtès
2019-04-29processes: Gracefully handle daemons without clients....Fixes <https://bugs.gnu.org/34716>. Reported by Mark H Weaver <mhw@netris.org>. The problem could be reproduced by running, on one hand: sh -c 'exec -a guix-daemon sleep 777' and on the other hand: guix processes If there is no process with PID 777, 'guix processes' would barf as it stumbles upon a <daemon-session> record whose client is #f. * guix/scripts/processes.scm (daemon-sessions)[child-process->session]: New procedure, with lambda formerly passed to 'map'. Handle #f returns from 'lookup-process'. Call 'child-process->session' within 'filter-map', not just 'map'. Ludovic Courtès
2019-04-29processes: 'process-open-files' ignores disappeared /proc/PID/fd entries....Previously, 'process-open-files' would throw ENOENT if an entry had vanished after the 'scandir' call and before the 'readlink' call. * guix/scripts/processes.scm (process-open-files): Catch ENOENT errors from 'readlink'. Ludovic Courtès
2018-10-29Add 'guix processes'....* guix/scripts/processes.scm, tests/processes.scm: New files. * Makefile.am (MODULES): Add the former. (SCM_TESTS): Add the latter. * po/guix/POTFILES.in: Add guix/scripts/processes.scm. * doc/guix.texi (Invoking guix processes): New node. (Invoking guix-daemon): Reference it. Ludovic Courtès