emacs: Use prompt for packages instead popup for edit action.

* emacs/guix-base.el (guix-package-location): New function.
  (guix-edit-package): Rename and move to ...
* emacs/guix.el (guix-edit): ...here.  Make it interactive.
* emacs/guix-command.el (guix-edit-action): New function (alias to
  'guix-edit') to override the popup for edit command in "M-x guix".
* emacs/guix-list.el (guix-list-edit-package): Adjust for 'guix-edit'
  renaming.
* emacs/guix-main.scm (package-location-string): Allow to accept package
  id or package name as argument.

emacs/guix-base.el

@@ -172,13 +172,11 @@ If PATH is relative, it is considered to be relative to
       (move-to-column col)
       (recenter 1))))
 
-(defun guix-edit-package (id)
-  "Edit (go to location of) package with ID."
-  (let ((loc (guix-eval-read (guix-make-guile-expression
-                              'package-location-string id))))
-    (if loc
-        (guix-find-location loc)
-      (message "Couldn't find package location."))))
+(defun guix-package-location (id-or-name)
+  "Return location of a package with ID-OR-NAME.
+For the meaning of location, see `guix-find-location'."
+  (guix-eval-read (guix-make-guile-expression
+                   'package-location-string id-or-name)))
 
 
 ;;; Receivable lists of packages, lint checkers, etc.

emacs/guix-command.el

@@ -627,6 +627,8 @@ EXECUTOR function is called with the current command line arguments."
 ;;;###autoload (autoload 'guix "guix-command" "Popup window for 'guix'." t)
 (guix-command-define-popup-action guix)
 
+(defalias 'guix-edit-action #'guix-edit)
+
 
 (defvar guix-command-font-lock-keywords
   (eval-when-compile

emacs/guix-list.el

@@ -472,7 +472,7 @@ With prefix (if ARG is non-nil), describe entries marked with any mark."
 (defun guix-list-edit-package ()
   "Go to the location of the current package."
   (interactive)
-  (guix-edit-package (guix-list-current-package-id)))
+  (guix-edit (guix-list-current-package-id)))
 
 
 ;;; Displaying packages

emacs/guix-main.scm

@@ -889,9 +889,10 @@ GENERATIONS is a list of generation numbers."
   (with-store store
     (delete-generations store profile generations)))
 
-(define (package-location-string package-id)
-  "Return a location string of a package PACKAGE-ID."
-  (and-let* ((package  (package-by-id package-id))
+(define (package-location-string id-or-name)
+  "Return a location string of a package with ID-OR-NAME."
+  (and-let* ((package  (or (package-by-id id-or-name)
+                           (first (packages-by-name id-or-name))))
              (location (package-location package)))
     (location->string location)))
 

emacs/guix.el

@@ -1,6 +1,6 @@
 ;;; guix.el --- Interface for GNU Guix package manager
 
-;; Copyright © 2014 Alex Kost <alezost@gmail.com>
+;; Copyright © 2014, 2015 Alex Kost <alezost@gmail.com>
 
 ;; Package-Requires: ((geiser "0.3"))
 ;; Keywords: tools
@@ -32,6 +32,7 @@
 (require 'guix-list)
 (require 'guix-info)
 (require 'guix-utils)
+(require 'guix-read)
 
 (defgroup guix nil
   "Interface for Guix package manager."
@@ -193,6 +194,15 @@ Interactively with prefix, prompt for PROFILE."
                              (float-time from)
                              (float-time to)))
 
+;;;###autoload
+(defun guix-edit (id-or-name)
+  "Edit (go to location of) package with ID-OR-NAME."
+  (interactive (list (guix-read-package-name)))
+  (let ((loc (guix-package-location id-or-name)))
+    (if loc
+        (guix-find-location loc)
+      (message "Couldn't find package location."))))
+
 (provide 'guix)
 
 ;;; guix.el ends here