[PATCH 3/6] gnu: Add emacs-mit-scheme-doc.

[Federico Beffa <beffa@ieee.org>]

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From 77b339ef57692e5c930b2b659f53cb1c65352857 Mon Sep 17 00:00:00 2001
From: Federico Beffa <beffa@fbengineering.ch>
Date: Fri, 25 Dec 2015 23:21:11 +0100
Subject: [PATCH 3/6] gnu: Add emacs-mit-scheme-doc.

* gnu/packages/emacs.scm (emacs-mit-scheme-doc): New variable.
---
 gnu/packages/emacs.scm | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/gnu/packages/emacs.scm b/gnu/packages/emacs.scm
index 28b3ca0..3a7c4ad 100644
--- a/gnu/packages/emacs.scm
+++ b/gnu/packages/emacs.scm
@@ -54,6 +54,7 @@
   #:use-module (gnu packages acl)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages pdf)
+  #:use-module (gnu packages scheme)
   #:use-module (gnu packages xiph)
   #:use-module (gnu packages mp3)
   #:use-module (guix utils)
@@ -1203,3 +1204,44 @@ which you can use for intelligent, context-sensitive completion for any Scheme
 implementation in Emacs.  To use it just load this file and bind that function
 to a key in your preferred mode.")
     (license license:gpl3+))) ;; check license
+
+(define-public emacs-mit-scheme-doc
+  (package
+    (name "emacs-mit-scheme-doc")
+    (version "20140203")
+    (source
+     (origin
+       (modules '((guix build utils)))
+       (snippet
+        ;; keep only file of interest
+        '(begin
+           (for-each delete-file '("dot-emacs.el" "Makefile"))
+           (copy-file "6.945-config/mit-scheme-doc.el" "mit-scheme-doc.el")
+           (delete-file-recursively "6.945-config")))
+       (file-name (string-append name "-" version ".tar.bz2"))
+       (method url-fetch)
+       (uri (string-append "http://groups.csail.mit.edu/mac/users/gjs/"
+                           "6.945/dont-panic/emacs-basic-config.tar.bz2"))
+       (sha256
+        (base32
+         "0dqidg2bd66pawqfarvwca93w5gqf9mikn1k2a2rmd9ymfjpziq1"))))
+    (build-system emacs-build-system)
+    (inputs `(("mit-scheme" ,mit-scheme)))
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'configure-doc
+           (lambda* (#:key inputs #:allow-other-keys)
+             (let* ((mit-scheme-dir (assoc-ref inputs "mit-scheme"))
+                    (doc-dir (string-append mit-scheme-dir "/share/doc/"
+                                            "mit-scheme-"
+                                            ,(package-version mit-scheme))))
+               (substitute* "mit-scheme-doc.el"
+                 (("http://www\\.gnu\\.org/software/mit-scheme/documentation/mit-scheme-ref/")
+                  (string-append "file:" doc-dir "/mit-scheme-ref/")))))))))
+    (home-page "http://groups.csail.mit.edu/mac/users/gjs/6.945/dont-panic/")
+    (synopsis "MIT-Scheme documentation lookup for Emacs")
+    (description
+     "This package provides a set of Emacs functions to search definitions of
+identifiers in the MIT-Scheme documentation.")
+    (license license:gpl2+)))
-- 
2.6.3