From bb3f36ed4ca83f01eb422f9de9c404d53218b382 Mon Sep 17 00:00:00 2001
From: David Craven <david@craven.ch>
Date: Sat, 10 Dec 2016 18:43:39 +0100
Subject: [PATCH] import: utils: Add some utilities.

* guix/import/utils.scm (maybe-inputs, maybe-native-inputs,
  package->definition): New variables.
---
 guix/import/utils.scm | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/guix/import/utils.scm b/guix/import/utils.scm
index 057c2d9c7d..f304da20e6 100644
--- a/guix/import/utils.scm
+++ b/guix/import/utils.scm
@@ -22,6 +22,7 @@ (define-module (guix import utils)
   #:use-module (guix base32)
   #:use-module ((guix build download) #:prefix build:)
   #:use-module (guix hash)
+  #:use-module (guix http-client)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix utils)
   #:use-module (ice-9 match)
@@ -36,6 +37,10 @@ (define-module (guix import utils)
             url-fetch
             guix-hash-url
 
+            maybe-inputs
+            maybe-native-inputs
+            package->definition
+
             spdx-string->license
             license->symbol
 
@@ -205,3 +210,32 @@ (define (beautify-description description)
     ;; Use double spacing between sentences
     (regexp-substitute/global #f "\\. \\b"
                               cleaned 'pre ".  " 'post)))
+
+(define (package-names->package-inputs names)
+  (map (lambda (input)
+         (list input (list 'unquote (string->symbol input))))
+       names))
+
+(define (maybe-inputs package-names)
+  "Given a list of PACKAGE-NAMES, tries to generate the 'inputs' field of a
+package definition."
+  (match (package-names->package-inputs package-names)
+    (()
+     '())
+    ((package-inputs ...)
+     `((inputs (,'quasiquote ,package-inputs))))))
+
+(define (maybe-native-inputs package-names)
+  "Given a list of PACKAGE-NAMES, tries to generate the 'inputs' field of a
+package definition."
+  (match (package-names->package-inputs package-names)
+    (()
+     '())
+    ((package-inputs ...)
+     `((native-inputs (,'quasiquote ,package-inputs))))))
+
+(define (package->definition guix-package)
+  (match guix-package
+    (('package ('name (? string? name)) _ ...)
+     `(define-public ,(string->symbol name)
+        ,guix-package))))