180 lines
6.8 KiB
Scheme
180 lines
6.8 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2017, 2018 Ludovic Courtès <ludo@gnu.org>
|
||
;;;
|
||
;;; This file is part of GNU Guix.
|
||
;;;
|
||
;;; GNU Guix is free software; you can redistribute it and/or modify it
|
||
;;; under the terms of the GNU General Public License as published by
|
||
;;; the Free Software Foundation; either version 3 of the License, or (at
|
||
;;; your option) any later version.
|
||
;;;
|
||
;;; GNU Guix is distributed in the hope that it will be useful, but
|
||
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;;; GNU General Public License for more details.
|
||
;;;
|
||
;;; You should have received a copy of the GNU General Public License
|
||
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
|
||
|
||
(define-module (guix scripts system search)
|
||
#:use-module (guix ui)
|
||
#:use-module (guix utils)
|
||
#:use-module (gnu services)
|
||
#:use-module (gnu services shepherd)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-11)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (srfi srfi-34)
|
||
#:use-module (ice-9 regex)
|
||
#:use-module (ice-9 match)
|
||
#:export (service-type->recutils
|
||
find-service-types
|
||
guix-system-search))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Implement the 'guix system search' command, which searches among the
|
||
;;; available service types.
|
||
;;;
|
||
;;; Code:
|
||
|
||
(define service-type-name*
|
||
(compose symbol->string service-type-name))
|
||
|
||
(define (service-type-default-shepherd-services type)
|
||
"Return the list of Shepherd services created by default instances of TYPE,
|
||
provided TYPE has a default value."
|
||
(match (guard (c ((service-error? c) #f))
|
||
(service type))
|
||
(#f '())
|
||
((? service? service)
|
||
(let* ((extension (find (lambda (extension)
|
||
(eq? (service-extension-target extension)
|
||
shepherd-root-service-type))
|
||
(service-type-extensions type)))
|
||
(compute (and extension (service-extension-compute extension))))
|
||
(if compute
|
||
(compute (service-value service))
|
||
'())))))
|
||
|
||
(define (service-type-shepherd-names type)
|
||
"Return the default names of Shepherd services created for TYPE."
|
||
(match (map shepherd-service-provision
|
||
(service-type-default-shepherd-services type))
|
||
(((names . _) ...)
|
||
names)))
|
||
|
||
(define* (service-type->recutils type port
|
||
#:optional (width (%text-width))
|
||
#:key (extra-fields '()))
|
||
"Write to PORT a recutils record of TYPE, arranging to fit within WIDTH
|
||
columns."
|
||
(define width*
|
||
;; The available number of columns once we've taken into account space for
|
||
;; the initial "+ " prefix.
|
||
(if (> width 2) (- width 2) width))
|
||
|
||
(define (extensions->recutils extensions)
|
||
(let ((list (string-join (map (compose service-type-name*
|
||
service-extension-target)
|
||
extensions))))
|
||
(string->recutils
|
||
(fill-paragraph list width*
|
||
(string-length "extends: ")))))
|
||
|
||
;; Note: Don't i18n field names so that people can post-process it.
|
||
(format port "name: ~a~%" (service-type-name type))
|
||
(format port "location: ~a~%"
|
||
(or (and=> (service-type-location type) location->string)
|
||
(G_ "unknown")))
|
||
|
||
(format port "extends: ~a~%"
|
||
(extensions->recutils (service-type-extensions type)))
|
||
|
||
;; If possible, display the list of *default* Shepherd service names. Note
|
||
;; that we may not always be able to do this (e.g., if the service type
|
||
;; lacks a default value); furthermore, it could be that the service
|
||
;; generates Shepherd services with different names if we give it different
|
||
;; parameters (this is the case, for instance, for
|
||
;; 'console-font-service-type'.)
|
||
(match (service-type-shepherd-names type)
|
||
(() #f)
|
||
(names (format port "shepherdnames:~{ ~a~}~%" names)))
|
||
|
||
(when (service-type-description type)
|
||
(format port "~a~%"
|
||
(string->recutils
|
||
(string-trim-right
|
||
(parameterize ((%text-width width*))
|
||
(texi->plain-text
|
||
(string-append "description: "
|
||
(or (and=> (service-type-description type) P_)
|
||
""))))
|
||
#\newline))))
|
||
|
||
(for-each (match-lambda
|
||
((field . value)
|
||
(let ((field (symbol->string field)))
|
||
(format port "~a: ~a~%"
|
||
field
|
||
(fill-paragraph (object->string value) width*
|
||
(string-length field))))))
|
||
extra-fields)
|
||
(newline port))
|
||
|
||
(define (service-type-description-string type)
|
||
"Return the rendered and localised description of TYPE, a service type."
|
||
(and=> (service-type-description type)
|
||
(compose texi->plain-text P_)))
|
||
|
||
(define %service-type-metrics
|
||
;; Metrics used to estimate the relevance of a search result.
|
||
`((,service-type-name* . 3)
|
||
(,service-type-description-string . 2)
|
||
(,(lambda (type)
|
||
(match (and=> (service-type-location type) location-file)
|
||
((? string? file)
|
||
(basename file ".scm"))
|
||
(#f
|
||
"")))
|
||
. 1)))
|
||
|
||
(define (find-service-types regexps)
|
||
"Return two values: the list of service types whose name or description
|
||
matches at least one of REGEXPS sorted by relevance, and the list of relevance
|
||
scores."
|
||
(let ((matches (fold-service-types
|
||
(lambda (type result)
|
||
(match (relevance type regexps
|
||
%service-type-metrics)
|
||
((? zero?)
|
||
result)
|
||
(score
|
||
(cons (list type score) result))))
|
||
'())))
|
||
(unzip2 (sort matches
|
||
(lambda (m1 m2)
|
||
(match m1
|
||
((type1 score1)
|
||
(match m2
|
||
((type2 score2)
|
||
(if (= score1 score2)
|
||
(string>? (service-type-name* type1)
|
||
(service-type-name* type2))
|
||
(> score1 score2)))))))))))
|
||
|
||
|
||
(define (guix-system-search . args)
|
||
(with-error-handling
|
||
(let ((regexps (map (cut make-regexp* <> regexp/icase) args)))
|
||
(leave-on-EPIPE
|
||
(let-values (((services scores)
|
||
(find-service-types regexps)))
|
||
(for-each (lambda (service score)
|
||
(service-type->recutils service
|
||
(current-output-port)
|
||
#:extra-fields
|
||
`((relevance . ,score))))
|
||
services
|
||
scores))))))
|