import: stackage: Support recursive importing.

* guix/import/hackage.scm (hackage-name->package-name): Export procedure.
* guix/import/stackage.scm (lts-info-packages-lts-info): Fix match expression.
(stackage-recursive-import): New procedure.
(stackage->guix-package): Memoize results.
* guix/scripts/import/stackage.scm (show-help, %options,
guix-import-stackage): Support recursive importing.
* doc/guix.texi (Invoking guix import): Document option.

2 files changed, 29 insertions, 17 deletions

diff --git a/guix/import/hackage.scm b/guix/import/hackage.scm
index 3c00f680bf..54301de2e8 100644
--- a/guix/import/hackage.scm
+++ b/guix/import/hackage.scm
@@ -44,6 +44,7 @@
             %hackage-updater
 
             guix-package->hackage-name
+            hackage-name->package-name
             hackage-fetch
             hackage-source-url
             hackage-cabal-url
diff --git a/guix/import/stackage.scm b/guix/import/stackage.scm
index ec93fbced6..afd5d997ae 100644
--- a/guix/import/stackage.scm
+++ b/guix/import/stackage.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2017 Federico Beffa <beffa@fbengineering.ch>
+;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -25,10 +26,12 @@
   #:use-module (srfi srfi-35)
   #:use-module (guix import json)
   #:use-module (guix import hackage)
+  #:use-module (guix import utils)
   #:use-module (guix memoization)
   #:use-module (guix packages)
   #:use-module (guix upstream)
   #:export (stackage->guix-package
+            stackage-recursive-import
             %stackage-updater))
 
 
@@ -45,9 +48,9 @@
     (_ #f)))
 
 (define (lts-info-packages lts-info)
-  "Retruns the alist of packages contained in LTS-INFO."
+  "Returns the alist of packages contained in LTS-INFO."
   (match lts-info
-    ((_ ("packages" pkg ...)) pkg)
+    ((("packages" pkg ...) . _) pkg)
     (_ '())))
 
 (define (leave-with-message fmt . args)
@@ -85,25 +88,33 @@
 (define (hackage-name-version name version)
   (and version (string-append  name "@" version)))
 
-(define* (stackage->guix-package package-name ; upstream name
-                                 #:key
-                                 (include-test-dependencies? #t)
-                                 (lts-version "")
-                                 (packages-info
-                                  (lts-info-packages
-                                   (stackage-lts-info-fetch lts-version))))
-  "Fetch Cabal file for PACKAGE-NAME from hackage.haskell.org.  The retrieved
+(define stackage->guix-package
+  (memoize
+   (lambda* (package-name ; upstream name
+             #:key
+             (include-test-dependencies? #t)
+             (lts-version "")
+             (packages-info
+              (lts-info-packages
+               (stackage-lts-info-fetch lts-version))))
+     "Fetch Cabal file for PACKAGE-NAME from hackage.haskell.org.  The retrieved
 vesion corresponds to the version of PACKAGE-NAME specified in the LTS-VERSION
 release at stackage.org.  Return the `package' S-expression corresponding to
 that package, or #f on failure.  PACKAGES-INFO is the alist with the packages
 included in the Stackage LTS release."
-  (let* ((version (lts-package-version packages-info package-name))
-         (name-version (hackage-name-version package-name version)))
-    (if name-version
-        (hackage->guix-package name-version
-                               #:include-test-dependencies?
-                               include-test-dependencies?)
-        (leave-with-message "~a: Stackage package not found" package-name))))
+     (let* ((version (lts-package-version packages-info package-name))
+            (name-version (hackage-name-version package-name version)))
+       (if name-version
+           (hackage->guix-package name-version
+                                  #:include-test-dependencies?
+                                  include-test-dependencies?)
+           (leave-with-message "~a: Stackage package not found" package-name))))))
+
+(define (stackage-recursive-import package-name . args)
+  (recursive-import package-name #f
+                    #:repo->guix-package (lambda (name repo)
+                                           (apply stackage->guix-package (cons name args)))
+                    #:guix-name hackage-name->package-name))
 
 
 ;;;