206 lines
8.0 KiB
Scheme
206 lines
8.0 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015 Andy Wingo <wingo@igalia.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services configuration)
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#:use-module (guix packages)
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#:use-module (guix records)
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#:use-module (guix gexp)
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#:autoload (texinfo) (texi-fragment->stexi)
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#:autoload (texinfo serialize) (stexi->texi)
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#:use-module (ice-9 match)
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#:use-module ((srfi srfi-1) #:select (append-map))
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:export (configuration-field
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configuration-field-name
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configuration-missing-field
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configuration-field-error
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serialize-configuration
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define-configuration
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validate-configuration
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generate-documentation
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serialize-field
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serialize-string
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serialize-name
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serialize-space-separated-string-list
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space-separated-string-list?
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serialize-file-name
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file-name?
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serialize-boolean
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serialize-package))
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;;; Commentary:
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;;;
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;;; Syntax for creating Scheme bindings to complex configuration files.
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;;;
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;;; Code:
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(define-condition-type &configuration-error &error
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configuration-error?)
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(define (configuration-error message)
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(raise (condition (&message (message message))
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(&configuration-error))))
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(define (configuration-field-error field val)
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(configuration-error
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(format #f "Invalid value for field ~a: ~s" field val)))
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(define (configuration-missing-field kind field)
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(configuration-error
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(format #f "~a configuration missing required field ~a" kind field)))
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(define-record-type* <configuration-field>
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configuration-field make-configuration-field configuration-field?
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(name configuration-field-name)
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(type configuration-field-type)
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(getter configuration-field-getter)
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(predicate configuration-field-predicate)
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(serializer configuration-field-serializer)
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(default-value-thunk configuration-field-default-value-thunk)
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(documentation configuration-field-documentation))
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(define (serialize-configuration config fields)
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(for-each (lambda (field)
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((configuration-field-serializer field)
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(configuration-field-name field)
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((configuration-field-getter field) config)))
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fields))
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(define (validate-configuration config fields)
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(for-each (lambda (field)
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(let ((val ((configuration-field-getter field) config)))
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(unless ((configuration-field-predicate field) val)
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(configuration-field-error
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(configuration-field-name field) val))))
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fields))
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(define-syntax define-configuration
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(lambda (stx)
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(define (id ctx part . parts)
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(let ((part (syntax->datum part)))
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(datum->syntax
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ctx
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(match parts
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(() part)
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(parts (symbol-append part
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(syntax->datum (apply id ctx parts))))))))
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(syntax-case stx ()
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((_ stem (field (field-type def) doc) ...)
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(with-syntax (((field-getter ...)
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(map (lambda (field)
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(id #'stem #'stem #'- field))
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#'(field ...)))
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((field-predicate ...)
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(map (lambda (type)
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(id #'stem type #'?))
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#'(field-type ...)))
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((field-serializer ...)
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(map (lambda (type)
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(id #'stem #'serialize- type))
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#'(field-type ...))))
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#`(begin
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(define-record-type* #,(id #'stem #'< #'stem #'>)
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#,(id #'stem #'% #'stem)
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#,(id #'stem #'make- #'stem)
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#,(id #'stem #'stem #'?)
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(field field-getter (default def))
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...)
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(define #,(id #'stem #'stem #'-fields)
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(list (configuration-field
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(name 'field)
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(type 'field-type)
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(getter field-getter)
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(predicate field-predicate)
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(serializer field-serializer)
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(default-value-thunk (lambda () def))
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(documentation doc))
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...))
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(define-syntax-rule (stem arg (... ...))
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(let ((conf (#,(id #'stem #'% #'stem) arg (... ...))))
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(validate-configuration conf
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#,(id #'stem #'stem #'-fields))
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conf))))))))
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(define (uglify-field-name field-name)
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(let ((str (symbol->string field-name)))
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(string-concatenate
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(map string-titlecase
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(string-split (if (string-suffix? "?" str)
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(substring str 0 (1- (string-length str)))
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str)
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#\-)))))
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(define (serialize-field field-name val)
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(format #t "~a ~a\n" (uglify-field-name field-name) val))
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(define (serialize-package field-name val)
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#f)
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(define (serialize-string field-name val)
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(serialize-field field-name val))
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(define (space-separated-string-list? val)
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(and (list? val)
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(and-map (lambda (x)
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(and (string? x) (not (string-index x #\space))))
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val)))
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(define (serialize-space-separated-string-list field-name val)
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(serialize-field field-name (string-join val " ")))
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(define (file-name? val)
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(and (string? val)
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(string-prefix? "/" val)))
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(define (serialize-file-name field-name val)
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(serialize-string field-name val))
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(define (serialize-boolean field-name val)
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(serialize-string field-name (if val "yes" "no")))
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;; A little helper to make it easier to document all those fields.
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(define (generate-documentation documentation documentation-name)
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(define (str x) (object->string x))
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(define (generate configuration-name)
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(match (assq-ref documentation configuration-name)
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((fields . sub-documentation)
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`((para "Available " (code ,(str configuration-name)) " fields are:")
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,@(map
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(lambda (f)
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(let ((field-name (configuration-field-name f))
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(field-type (configuration-field-type f))
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(field-docs (cdr (texi-fragment->stexi
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(configuration-field-documentation f))))
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(default (catch #t
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(configuration-field-default-value-thunk f)
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(lambda _ '%invalid))))
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(define (show-default? val)
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(or (string? default) (number? default) (boolean? default)
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(and (symbol? val) (not (eq? val '%invalid)))
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(and (list? val) (and-map show-default? val))))
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`(deftypevr (% (category
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(code ,(str configuration-name)) " parameter")
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(data-type ,(str field-type))
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(name ,(str field-name)))
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,@field-docs
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,@(if (show-default? default)
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`((para "Defaults to " (samp ,(str default)) "."))
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'())
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,@(append-map
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generate
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(or (assq-ref sub-documentation field-name) '())))))
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fields)))))
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(stexi->texi `(*fragment* . ,(generate documentation-name))))
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