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diff --git a/gitto/config.scm b/gitto/config.scm
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+;; -*- coding: utf-8; -*-
+;; gitto -- Keep track of your git repositories
+;; Copyright (C) 2012 Tom Willemsen <tom at ryuslash dot org>
+
+;; This file is part of gitto.
+
+;; gitto 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.
+
+;; gitto 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 gitto.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gitto config)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 rdelim)
+  #:export (global-config
+
+            merge-config
+            read-config
+            write-config))
+
+(define global-config '())
+
+(define (merge-config repo-name x y)
+  (let ((lst (if x (list-copy x) '())))
+    (for-each
+     (lambda (s)
+       (let ((b-sec (assoc (car s) lst)))
+        (set! lst (assoc-set!
+                   lst (car s) (merge-settings
+                                repo-name (if b-sec (cdr b-sec) #f) (cdr s))))))
+     y)
+    lst))
+
+(define (merge-settings repo-name x y)
+  (let ((lst (if x (list-copy x) '())))
+    (for-each (lambda (v)
+                (set! lst (assoc-set!
+                           lst (car v) (format #f (cdr v) repo-name))))
+              y)
+    lst))
+
+(define (parse-setting line)
+  (let ((idx (string-index line #\=)))
+    (list (cons (string-trim-both (substring line 0 idx))
+                (string-trim-both (substring line (1+ idx)))))))
+
+(define (read-config repo-location)
+  (let ((port (open-input-file
+               (string-append repo-location "/.git/config")))
+        (config '())
+        (current-section #f)
+        (assign-pos #f))
+    (do ((line (read-line port) (read-line port)))
+        ((eof-object? line))
+      (cond ((string= line "[" 0 1)
+             (let ((section (cons (string-trim-both
+                                   line (char-set #\[ #\])) '())))
+               (set! config (append config (list section)))
+               (set! current-section section)))
+            ((string-contains line "=")
+             (set-cdr! current-section
+                       (append (cdr current-section)
+                               (parse-setting line))))))
+    (close-port port)
+    config))
+
+(define* (write-config config #:optional (file #f))
+  (let ((thunk (lambda () (for-each write-section config))))
+    (if file
+        (with-output-to-file file thunk)
+        (thunk))))
+
+(define (write-section section)
+  (format #t "[~a]~%" (car section))
+  (for-each write-setting (cdr section)))
+
+(define (write-setting setting)
+  (format #t "~8t~a = ~a~%" (car setting) (cdr setting)))