import: go: Append version to symbol name in the pinned version mode.

This allows importing packages with complicated version specific dependency
chains without the package symbol names colliding.

* doc/guix.texi (Invoking guix import): Document the --pin-versions option.
Mention that a specific version can be imported.  Remove the experimental
warning.
* guix/import/go.scm (go-module->guix-package-name)[version]: Add optional
argument.  Rewrite the character translation in terms of string-map.
(go-module->guix-package): Conditionally use dependencies whose symbol include
their version, based no the value of the PIN-VERSIONS? argument.
* guix/import/utils.scm (package->definition): Add a new case where the full
version string is appended to the package symbol.
* guix/scripts/import.scm (guix-import): Correctly print forms starting
with '(define-public [...]'.
* guix/scripts/import/go.scm (guix-import-go): Conditionally include the
version in the package symbols defined.

1 files changed, 10 insertions, 7 deletions

diff --git a/guix/scripts/import/go.scm b/guix/scripts/import/go.scm
index 33d2470ce1..04b07f80cc 100644
--- a/guix/scripts/import/go.scm
+++ b/guix/scripts/import/go.scm
@@ -22,9 +22,11 @@
   #:use-module (guix utils)
   #:use-module (guix scripts)
   #:use-module (guix import go)
+  #:use-module (guix import utils)
   #:use-module (guix scripts import)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-26)
   #:use-module (srfi srfi-37)
   #:use-module (ice-9 match)
   #:use-module (ice-9 format)
@@ -94,7 +96,12 @@ that are not yet in Guix"))
                              (('argument . value)
                               value)
                              (_ #f))
-                           (reverse opts))))
+                           (reverse opts)))
+         ;; Append the full version to the package symbol name when using
+         ;; pinned versions.
+         (package->definition* (if (assoc-ref opts 'pin-versions?)
+                                   (cut package->definition <> 'full)
+                                   package->definition)))
     (match args
       ((spec)                         ;e.g., github.com/golang/protobuf@v1.3.1
        (receive (name version)
@@ -106,18 +113,14 @@ that are not yet in Guix"))
                                 (assoc-ref opts 'pin-versions?))))
            (if (assoc-ref opts 'recursive)
                ;; Recursive import.
-               (map (match-lambda
-                      ((and ('package ('name name) . rest) pkg)
-                       `(define-public ,(string->symbol name)
-                          ,pkg))
-                      (_ #f))
+               (map package->definition*
                     (apply go-module-recursive-import arguments))
                ;; Single import.
                (let ((sexp (apply go-module->guix-package arguments)))
                  (unless sexp
                    (leave (G_ "failed to download meta-data for module '~a'~%")
                           module-name))
-                 sexp)))))
+                 (package->definition* sexp))))))
       (()
        (leave (G_ "too few arguments~%")))
       ((many ...)