[PATCH 2/5] build: emacs-utils: Add 'emacs-byte-compile-directory'

[Federico Beffa <beffa@ieee.org>]

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A new general utility for Emacs.

Fede

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From d036941639ecffe8fb29dd9cc7ee9b5fe0e6b10c Mon Sep 17 00:00:00 2001
From: Federico Beffa <beffa@fbengineering.ch>
Date: Tue, 16 Jun 2015 21:09:57 +0200
Subject: [PATCH 2/5] build: emacs-utils: Add 'emacs-byte-compile-directory'.

* guix/build/emacs-utils.scm (emacs-byte-compile-directory): New procedure.
---
 guix/build/emacs-utils.scm | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/guix/build/emacs-utils.scm b/guix/build/emacs-utils.scm
index 0cff28b..3ecccd9 100644
--- a/guix/build/emacs-utils.scm
+++ b/guix/build/emacs-utils.scm
@@ -22,6 +22,7 @@
             emacs-batch-eval
             emacs-batch-edit-file
             emacs-generate-autoloads
+            emacs-byte-compile-directory
             emacs-substitute-sexps
             emacs-substitute-variables))
 
@@ -57,6 +58,18 @@
                   (update-directory-autoloads ,directory))))
     (emacs-batch-eval expr)))
 
+(define* (emacs-byte-compile-directory dir #:optional (dependency-dirs '()))
+  "Byte compile all files in DIR and its sub-directories.  Before compiling
+the files, add DIR and all directories in DEPENDENCY-DIRS to 'load-path'."
+  (let ((expr `(progn
+                (add-to-list 'load-path ,dir)
+                (unless (null ,(if (null? dependency-dirs)
+                                   'nil
+                                   dependency-dirs))
+                  (setq load-path (append load-path ,dependency-dirs)))
+                (byte-recompile-directory (file-name-as-directory ,dir) 0))))
+    (emacs-batch-eval expr)))
+
 (define-syntax emacs-substitute-sexps
   (syntax-rules ()
     "Substitute the S-expression immediately following the first occurrence of
-- 
2.2.1