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13/23: emacs: Add 'guix-package-names'.


From: Alex Kost
Subject: 13/23: emacs: Add 'guix-package-names'.
Date: Sun, 30 Aug 2015 15:28:14 +0000

alezost pushed a commit to branch master
in repository guix.

commit 25a2839c9dfb72fc4eddf0621b80023f87fc2e2e
Author: Alex Kost <address@hidden>
Date:   Wed Aug 12 14:40:47 2015 +0300

    emacs: Add 'guix-package-names'.
    
    * emacs/guix-main.scm (package-names, package-names-lists): New procedures.
    * emacs/guix-base.el (guix-package-names): New function.
---
 emacs/guix-base.el  |   14 ++++++++++++++
 emacs/guix-main.scm |   11 +++++++++++
 2 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/emacs/guix-base.el b/emacs/guix-base.el
index 1f4a00c..9cec510 100644
--- a/emacs/guix-base.el
+++ b/emacs/guix-base.el
@@ -191,6 +191,20 @@ If PATH is relative, it is considered to be relative to
   "Return a list of names of available lint checkers."
   (guix-eval-read (guix-make-guile-expression 'lint-checker-names)))
 
+(guix-memoized-defun guix-package-names ()
+  "Return a list of names of available packages."
+  (sort
+   ;; Work around <https://github.com/jaor/geiser/issues/64>:
+   ;; list of strings is parsed much slower than list of lists,
+   ;; so we use 'package-names-lists' instead of 'package-names'.
+
+   ;; (guix-eval-read (guix-make-guile-expression 'package-names))
+
+   (mapcar #'car
+           (guix-eval-read (guix-make-guile-expression
+                            'package-names-lists)))
+   #'string<))
+
 
 ;;; Buffers and auto updating.
 
diff --git a/emacs/guix-main.scm b/emacs/guix-main.scm
index 191aa8d..341657d 100644
--- a/emacs/guix-main.scm
+++ b/emacs/guix-main.scm
@@ -942,3 +942,14 @@ GENERATIONS is a list of generation numbers."
   (map (lambda (checker)
          (symbol->string (lint-checker-name checker)))
        %checkers))
+
+(define (package-names)
+  "Return a list of names of available packages."
+  (delete-duplicates
+   (fold-packages (lambda (pkg res)
+                    (cons (package-name pkg) res))
+                  '())))
+
+;; See the comment to 'guix-package-names' function in "guix-popup.el".
+(define (package-names-lists)
+  (map list (package-names)))



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