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-rw-r--r--.dir-locals.el4
-rw-r--r--Makefile.am1
-rw-r--r--guix/build/emacs-utils.scm92
3 files changed, 97 insertions, 0 deletions
diff --git a/.dir-locals.el b/.dir-locals.el
index 64a680c59f..69c25cbe8f 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -29,6 +29,10 @@
(eval . (put 'call-with-compressed-output-port 'scheme-indent-function 2))
(eval . (put 'call-with-decompressed-port 'scheme-indent-function 2))
(eval . (put 'signature-case 'scheme-indent-function 1))
+ (eval . (put 'emacs-batch-eval 'scheme-indent-function 0))
+ (eval . (put 'emacs-batch-edit-file 'scheme-indent-function 1))
+ (eval . (put 'emacs-substitute-sexps 'scheme-indent-function 1))
+ (eval . (put 'emacs-substitute-variables 'scheme-indent-function 1))
(eval . (put 'syntax-parameterize 'scheme-indent-function 1))
(eval . (put 'with-monad 'scheme-indent-function 1))
diff --git a/Makefile.am b/Makefile.am
index 6695e7e5b7..eab126acee 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -73,6 +73,7 @@ MODULES = \
guix/build/install.scm \
guix/build/activation.scm \
guix/build/syscalls.scm \
+ guix/build/emacs-utils.scm \
guix/packages.scm \
guix/snix.scm \
guix/scripts/download.scm \
diff --git a/guix/build/emacs-utils.scm b/guix/build/emacs-utils.scm
new file mode 100644
index 0000000000..10ef3c8d0f
--- /dev/null
+++ b/guix/build/emacs-utils.scm
@@ -0,0 +1,92 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build emacs-utils)
+ #:export (%emacs
+ emacs-batch-eval
+ emacs-batch-edit-file
+ emacs-substitute-sexps
+ emacs-substitute-variables))
+
+;;; Commentary:
+;;;
+;;; Tools to programmatically edit files using Emacs,
+;;; e.g. to replace entire s-expressions in elisp files.
+;;;
+;;; Code:
+
+(define %emacs
+ ;; The `emacs' command.
+ (make-parameter "emacs"))
+
+(define (emacs-batch-eval expr)
+ "Run Emacs in batch mode, and execute the elisp code EXPR."
+ (unless (zero? (system* (%emacs) "--quick" "--batch"
+ (format #f "--eval=~S" expr)))
+ (error "emacs-batch-eval failed!" expr)))
+
+(define (emacs-batch-edit-file file expr)
+ "Load FILE in Emacs using batch mode, and execute the elisp code EXPR."
+ (unless (zero? (system* (%emacs) "--quick" "--batch"
+ (string-append "--visit=" file)
+ (format #f "--eval=~S" expr)))
+ (error "emacs-batch-edit-file failed!" file expr)))
+
+(define-syntax emacs-substitute-sexps
+ (syntax-rules ()
+ "Substitute the S-expression immediately following the first occurrence of
+LEADING-REGEXP by the string returned by REPLACEMENT in FILE. For example:
+
+ (emacs-substitute-sexps \"w3m.el\"
+ (\"defcustom w3m-command\"
+ (string-append w3m \"/bin/w3m\"))
+ (\"defvar w3m-image-viewer\"
+ (string-append imagemagick \"/bin/display\")))
+
+This replaces the default values of the `w3m-command' and `w3m-image-viewer'
+variables declared in `w3m.el' with the results of the `string-append' calls
+above. Note that LEADING-REGEXP uses Emacs regexp syntax."
+ ((emacs-substitute-sexps file (leading-regexp replacement) ...)
+ (emacs-batch-edit-file file
+ `(progn (progn (goto-char (point-min))
+ (re-search-forward ,leading-regexp)
+ (kill-sexp)
+ (insert " ")
+ (insert ,(format #f "~S" replacement)))
+ ...
+ (basic-save-buffer))))))
+
+(define-syntax emacs-substitute-variables
+ (syntax-rules ()
+ "Substitute the default value of VARIABLE by the string returned by
+REPLACEMENT in FILE. For example:
+
+ (emacs-substitute-variables \"w3m.el\"
+ (\"w3m-command\" (string-append w3m \"/bin/w3m\"))
+ (\"w3m-image-viewer\" (string-append imagemagick \"/bin/display\")))
+
+This replaces the default values of the `w3m-command' and `w3m-image-viewer'
+variables declared in `w3m.el' with the results of the `string-append' calls
+above."
+ ((emacs-substitute-variables file (variable replacement) ...)
+ (emacs-substitute-sexps file
+ ((string-append "(def[a-z]+[[:space:]\n]+" variable "\\>")
+ replacement)
+ ...))))
+
+;;; emacs-utils.scm ends here