import: Add binary npm importer.wip-node-importer

* guix/scripts/import.scm: (importers): Add "npm-binary".
* guix/import/npm-binary.scm: New file.
* guix/scripts/import/npm-binary.scm: New file.
* Makefile.am: Add them.

Co-authored-by: Timothy Sample <samplet@ngyro.com>
Co-authored-by: Lars-Dominik Braun <lars@6xq.net>

4 files changed, 351 insertions, 1 deletions

diff --git a/Makefile.am b/Makefile.am
index 0129011ebf..e46898a11a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -258,6 +258,7 @@ MODULES =					\
   guix/import/json.scm				\
   guix/import/kde.scm				\
   guix/import/launchpad.scm   			\
+  guix/import/npm-binary.scm			\
   guix/import/opam.scm				\
   guix/import/print.scm				\
   guix/import/pypi.scm				\
@@ -299,6 +300,7 @@ MODULES =					\
   guix/scripts/import/go.scm			\
   guix/scripts/import/hackage.scm		\
   guix/scripts/import/json.scm  		\
+  guix/scripts/import/npm-binary.scm		\
   guix/scripts/import/opam.scm			\
   guix/scripts/import/pypi.scm			\
   guix/scripts/import/stackage.scm		\
diff --git a/guix/import/npm-binary.scm b/guix/import/npm-binary.scm
new file mode 100644
index 0000000000..45c872d5d2
--- /dev/null
+++ b/guix/import/npm-binary.scm
@@ -0,0 +1,235 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019, 2020 Timothy Sample <samplet@ngyro.com>
+;;; Copyright © 2020 Jelle Licht <jlicht@fsfe.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 import npm-binary)
+  #:use-module (guix import json)
+  #:use-module (guix import utils)
+  #:use-module (guix memoization)
+  #:use-module (guix utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 regex)
+  #:use-module (ice-9 receive)
+  #:use-module (json)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-41)
+  #:use-module (web client)
+  #:use-module (web response)
+  #:use-module (web uri)
+  #:export (npm-binary-recursive-import
+            npm-binary->guix-package
+            package-json->guix-package
+            make-versioned-package
+            name+version->symbol))
+
+;; Autoload Guile-Semver so we only have a soft dependency.
+(module-autoload! (current-module)
+		  '(semver) '(string->semver semver? semver->string semver=? semver>?))
+(module-autoload! (current-module)
+		  '(semver ranges) '(*semver-range-any* string->semver-range semver-range-contains?))
+
+;; Dist-tags
+(define-json-mapping <dist-tags> make-dist-tags dist-tags?
+  json->dist-tags
+  (latest dist-tags-latest "latest" string->semver))
+
+(define-record-type <versioned-package>
+  (make-versioned-package name version)
+  versioned-package?
+  (name  versioned-package-name)       ;string
+  (version versioned-package-version)) ;string
+
+(define (dependencies->versioned-packages entries)
+  (match entries
+    (((names . versions) ...)
+     (map make-versioned-package names versions))
+    (_ '())))
+
+(define-json-mapping <dist> make-dist dist?
+  json->dist
+  (tarball dist-tarball))
+
+(define-json-mapping <package-revision> make-package-revision package-revision?
+  json->package-revision
+  (name package-revision-name)
+  (version package-revision-version "version" string->semver) ;semver
+  (home-page package-revision-home-page "homepage")           ;string
+  (dependencies package-revision-dependencies "dependencies"  ;list of versioned-package
+                dependencies->versioned-packages)
+  (license package-revision-license "license" spdx-string->license) ;license
+  (description package-revision-description)                        ;string
+  (dist package-revision-dist "dist" json->dist))                   ;dist
+
+(define (versions->package-revisions versions)
+  (match versions
+    (((version . package-spec) ...)
+     (map json->package-revision package-spec))
+    (_ '())))
+
+(define (versions->package-versions versions)
+  (match versions
+    (((version . package-spec) ...)
+     (map string->semver versions))
+    (_ '())))
+
+(define-json-mapping <meta-package> make-meta-package meta-package?
+  json->meta-package
+  (name meta-package-name)                                       ;string
+  (description meta-package-description)                         ;string
+  (dist-tags meta-package-dist-tags "dist-tags" json->dist-tags) ;dist-tags
+  (revisions meta-package-revisions "versions" versions->package-revisions))
+
+;; TODO: Support other registries
+(define *registry* "https://registry.npmjs.org")
+(define *default-page* "https://www.npmjs.com/package")
+
+(define (lookup-meta-package name)
+  (let ((json (json-fetch (string-append *registry* "/" (uri-encode name)))))
+    (and=> json json->meta-package)))
+
+(define lookup-meta-package* (memoize lookup-meta-package))
+
+(define (http-error-code arglist)
+  (match arglist
+    (('http-error _ _ _ (code)) code)
+    (_ #f)))
+
+(define (meta-package-versions meta)
+  (map package-revision-version
+       (meta-package-revisions meta)))
+
+(define (meta-package-latest meta)
+  (and=> (meta-package-dist-tags meta) dist-tags-latest))
+
+(define* (meta-package-package meta #:optional
+                               (version (meta-package-latest meta)))
+  (match version
+    ((? semver?) (find (lambda (revision)
+                         (semver=? version (package-revision-version revision)))
+                       (meta-package-revisions meta)))
+    ((? string?) (meta-package-package meta (string->semver version)))
+    (_ #f)))
+
+(define* (semver-latest svs #:optional (svr *semver-range-any*))
+  (find (cut semver-range-contains? svr <>)
+        (sort svs semver>?)))
+
+(define* (resolve-package name #:optional (svr *semver-range-any*))
+  (let ((meta (lookup-meta-package* name)))
+    (and meta
+         (let* ((version (semver-latest (or (meta-package-versions meta) '()) svr))
+                (pkg (meta-package-package meta version)))
+           pkg))))
+
+
+;;;
+;;; Converting packages
+;;;
+
+(define (hash-url url)
+  "Downloads the resource at URL and computes the base32 hash for it."
+  (call-with-temporary-output-file
+   (lambda (temp port)
+     (begin ((@ (guix import utils) url-fetch) url temp)
+            (guix-hash-url temp)))))
+
+(define (npm-name->name npm-name)
+  "Return a Guix package name for the npm package with name NPM-NAME."
+  (define (clean name)
+    (string-map (lambda (chr) (if (char=? chr #\/) #\- chr))
+                (string-filter (negate (cut char=? <> #\@)) name)))
+  (guix-name "node-" (clean npm-name)))
+
+(define (name+version->symbol name version)
+    (string->symbol (string-append name "-" version)))
+
+(define (package-revision->symbol package)
+  (let* ((npm-name (package-revision-name package))
+         (version (semver->string (package-revision-version package)))
+         (name (npm-name->name npm-name)))
+    (name+version->symbol name version)))
+
+(define (package-revision->input package)
+  "Return the `inputs' entry for PACKAGE."
+  (let* ((npm-name (package-revision-name package))
+         (name (npm-name->name npm-name)))
+    `(,name
+      (,'unquote ,(package-revision->symbol package)))))
+
+(define (npm-package->package-sexp npm-package)
+  "Return the `package' s-expression for an NPM-PACKAGE."
+  (match npm-package
+    (($ <package-revision> name version home-page dependencies license description dist)
+     (let* ((name (npm-name->name name))
+            (url (dist-tarball dist))
+            (home-page (if (string? home-page)
+                           home-page
+                           (string-append *default-page* "/" (uri-encode name))))
+            (synopsis description)
+            (resolved-deps (map (match-lambda (($ <versioned-package> name version)
+                                               (resolve-package name (string->semver-range version)))) dependencies)))
+       (values
+        `(package
+           (name ,name)
+           (version ,(semver->string (package-revision-version npm-package)))
+           (source (origin
+                     (method url-fetch)
+                     (uri ,url)
+                     (sha256 (base32 ,(hash-url url)))))
+           (build-system node-build-system)
+           (arguments
+            `(#:tests? #f
+              #:phases
+              (modify-phases %standard-phases
+                (delete 'configure)
+                (delete 'build))))
+           ,@(match dependencies
+               (() '())
+               ((dependencies ...)
+                `((inputs
+                   (,'quasiquote ,(map package-revision->input
+                                       resolved-deps))))))
+           (home-page ,home-page)
+           (synopsis ,synopsis)
+           (description ,description)
+           (license ,license))
+        (map (match-lambda (($ <package-revision> name version)
+                            (list name (semver->string version))))
+             resolved-deps))))
+    (_ #f)))
+
+
+;;;
+;;; Interface
+;;;
+
+(define npm-binary->guix-package
+  (lambda* (name #:key (version *semver-range-any*) #:allow-other-keys)
+    (let* ((svr (match version
+                  ((? string?) (string->semver-range version))
+                  (_ version)))
+           (pkg (resolve-package name svr)))
+      (and=> pkg npm-package->package-sexp))))
+
+(define* (npm-binary-recursive-import package-name #:key version)
+  (recursive-import package-name
+                    #:repo->guix-package (memoize npm-binary->guix-package)
+                    #:version version
+                    #:guix-name npm-name->name))
diff --git a/guix/scripts/import.scm b/guix/scripts/import.scm
index bbd9a3b190..f1445c08c9 100644
--- a/guix/scripts/import.scm
+++ b/guix/scripts/import.scm
@@ -77,7 +77,7 @@ rather than \\n."
 ;;;
 
 (define importers '("gnu" "pypi" "cpan" "hackage" "stackage" "elpa" "gem"
-                    "go" "cran" "crate" "texlive" "json" "opam"))
+                    "go" "cran" "crate" "texlive" "json" "opam" "npm-binary"))
 
 (define (resolve-importer name)
   (let ((module (resolve-interface
diff --git a/guix/scripts/import/npm-binary.scm b/guix/scripts/import/npm-binary.scm
new file mode 100644
index 0000000000..825c43bbc3
--- /dev/null
+++ b/guix/scripts/import/npm-binary.scm
@@ -0,0 +1,113 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 David Thompson <davet@gnu.org>
+;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2019 Timothy Sample <samplet@ngyro.com>
+;;;
+;;; 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 import npm-binary)
+  #:use-module (guix ui)
+  #:use-module (guix utils)
+  #:use-module (guix scripts)
+  #:use-module (guix import npm-binary)
+  #:use-module (guix scripts import)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-37)
+  #:use-module (srfi srfi-41)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:export (guix-import-npm-binary))
+
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+  '())
+
+(define (show-help)
+  (display (G_ "Usage: guix import npm-binary PACKAGE-NAME [VERSION]
+Import and convert the NPM package PACKAGE-NAME using the
+`npm-build-system' (but without building the package from source)."))
+  (display (G_ "
+  -h, --help             display this help and exit"))
+  (display (G_ "
+  -r, --recursive        import packages recursively"))
+  (display (G_ "
+  -V, --version          display version information and exit"))
+  (newline)
+  (show-bug-report-information))
+
+(define %options
+  ;; Specification of the command-line options.
+  (cons* (option '(#\h "help") #f #f
+                 (lambda args
+                   (show-help)
+                   (exit 0)))
+         (option '(#\V "version") #f #f
+                 (lambda args
+                   (show-version-and-exit "guix import npm-binary")))
+         (option '(#\r "recursive") #f #f
+                 (lambda (opt name arg result)
+                   (alist-cons 'recursive #t result)))
+         %standard-import-options))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-import-npm-binary . args)
+  (define (parse-options)
+    ;; Return the alist of option values.
+    (args-fold* args %options
+                (lambda (opt name arg result)
+                  (leave (G_ "~A: unrecognized option~%") name))
+                (lambda (arg result)
+                  (alist-cons 'argument arg result))
+                %default-options))
+
+  (let* ((opts (parse-options))
+         (args (filter-map (match-lambda
+                             (('argument . value)
+                              value)
+                             (_ #f))
+                           (reverse opts))))
+    (let loop ((args args))
+      (match args
+        ((package-name version)
+         (if (assoc-ref opts 'recursive)
+             ;; Recursive import
+             (map (match-lambda
+                    ((and ('package ('name name) ('version version) . rest) pkg)
+                     `(define-public ,(name+version->symbol name version)
+                        ,pkg))
+                    (_ #f))
+                  (npm-binary-recursive-import package-name #:version version))
+             ;; Single import
+             (let ((sexp (npm-binary->guix-package package-name #:version version)))
+               (unless sexp
+                 (leave (G_ "failed to download meta-data for package '~a@~a'~%")
+                        package-name version))
+               sexp)))
+        ((package-name)
+         (loop (list package-name "*")))
+        (()
+         (leave (G_ "too few arguments~%")))
+        ((many ...)
+         (leave (G_ "too many arguments~%")))))))