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Add (guix discovery).
Add (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.gn-latest-20200428
Ludovic Courtès
5 years ago
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GPG Key ID: 90B11993D9AEBB5
5 changed files with 194 additions and 86 deletions
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;;; GNU Guix --- Functional package management for GNU |
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;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org> |
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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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|
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(define-module (guix discovery) |
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#:use-module (guix ui) |
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#:use-module (guix combinators) |
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#:use-module (srfi srfi-1) |
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#:use-module (ice-9 match) |
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#:use-module (ice-9 vlist) |
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#:use-module (ice-9 ftw) |
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#:export (scheme-modules |
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fold-modules |
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all-modules |
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fold-module-public-variables)) |
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|
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;;; Commentary: |
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;;; |
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;;; This module provides tools to discover Guile modules and the variables |
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;;; they export. |
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;;; |
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;;; Code: |
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(define* (scheme-files directory) |
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"Return the list of Scheme files found under DIRECTORY, recursively. The |
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returned list is sorted in alphabetical order." |
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|
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;; Sort entries so that 'fold-packages' works in a deterministic fashion |
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;; regardless of details of the underlying file system. |
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(sort (file-system-fold (const #t) ;enter? |
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(lambda (path stat result) ;leaf |
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(if (string-suffix? ".scm" path) |
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(cons path result) |
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result)) |
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(lambda (path stat result) ;down |
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result) |
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(lambda (path stat result) ;up |
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result) |
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(const #f) ;skip |
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(lambda (path stat errno result) |
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(unless (= ENOENT errno) |
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(warning (G_ "cannot access `~a': ~a~%") |
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path (strerror errno))) |
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result) |
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'() |
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directory |
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stat) |
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string<?)) |
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|
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(define file-name->module-name |
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(let ((not-slash (char-set-complement (char-set #\/)))) |
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(lambda (file) |
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"Return the module name (a list of symbols) corresponding to FILE." |
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(map string->symbol |
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(string-tokenize (string-drop-right file 4) not-slash))))) |
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|
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(define* (scheme-modules directory #:optional sub-directory) |
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"Return the list of Scheme modules available under DIRECTORY. |
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Optionally, narrow the search to SUB-DIRECTORY." |
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(define prefix-len |
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(string-length directory)) |
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|
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(filter-map (lambda (file) |
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(let* ((file (substring file prefix-len)) |
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(module (file-name->module-name file))) |
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(catch #t |
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(lambda () |
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(resolve-interface module)) |
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(lambda args |
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;; Report the error, but keep going. |
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(warn-about-load-error module args) |
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#f)))) |
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(scheme-files (if sub-directory |
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(string-append directory "/" sub-directory) |
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directory)))) |
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|
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(define (fold-modules proc init path) |
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"Fold over all the Scheme modules present in PATH, a list of directories. |
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Call (PROC MODULE RESULT) for each module that is found." |
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(fold (lambda (spec result) |
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(match spec |
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((? string? directory) |
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(fold proc result (scheme-modules directory))) |
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((directory . sub-directory) |
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(fold proc result |
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(scheme-modules directory sub-directory))))) |
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'() |
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path)) |
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|
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(define (all-modules path) |
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"Return the list of package modules found in PATH, a list of directories to |
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search. Entries in PATH can be directory names (strings) or (DIRECTORY |
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. SUB-DIRECTORY) pairs, in which case modules are searched for beneath |
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SUB-DIRECTORY." |
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(fold-modules cons '() path)) |
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|
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(define (fold-module-public-variables proc init modules) |
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"Call (PROC OBJECT RESULT) for each variable exported by one of MODULES, |
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using INIT as the initial value of RESULT. It is guaranteed to never traverse |
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the same object twice." |
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(identity ; discard second return value |
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(fold2 (lambda (module result seen) |
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(fold2 (lambda (var result seen) |
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(if (not (vhash-assq var seen)) |
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(values (proc var result) |
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(vhash-consq var #t seen)) |
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(values result seen))) |
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result |
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seen |
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(module-map (lambda (sym var) |
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(false-if-exception (variable-ref var))) |
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module))) |
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init |
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vlist-null |
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modules))) |
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|
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;;; discovery.scm ends here |
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@ -0,0 +1,52 @@ |
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;;; GNU Guix --- Functional package management for GNU |
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;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org> |
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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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|
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(define-module (test-discovery) |
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#:use-module (guix discovery) |
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#:use-module (guix build-system) |
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#:use-module (srfi srfi-64) |
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#:use-module (ice-9 match)) |
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|
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(define %top-srcdir |
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(dirname (search-path %load-path "guix.scm"))) |
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(test-begin "discovery") |
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(test-assert "scheme-modules" |
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(match (map module-name (scheme-modules %top-srcdir "guix/import")) |
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((('guix 'import _ ...) ..1) |
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#t))) |
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|
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(test-assert "all-modules" |
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(match (map module-name |
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(all-modules `((,%top-srcdir . "guix/build-system")))) |
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((('guix 'build-system names) ..1) |
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names))) |
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|
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(test-assert "fold-module-public-variables" |
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(let ((modules (all-modules `((,%top-srcdir . "guix/build-system"))))) |
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(match (fold-module-public-variables (lambda (obj result) |
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(if (build-system? obj) |
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(cons obj result) |
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result)) |
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'() |
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modules) |
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(((? build-system? bs) ..1) |
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bs)))) |
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|
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(test-end "discovery") |
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