Add read-config

This function parses the config file in the .git/ sub-directory of a
repository.

gitto/Makefile

@@ -3,7 +3,8 @@ SITEDIR = $(shell pkg-config guile-2.0 --variable=sitedir \
 	--define-variable=prefix=$(DESTDIR))
 COMPDIR = $(DESTDIR)/lib/guile/2.0/site-ccache
 
-objects = git.scm git.go main.scm main.go path.scm path.go
+objects = config.scm config.go git.scm git.go main.scm main.go path.scm \
+	path.go
 install-objects = $(addprefix install-,$(objects))
 uninstall-objects = $(addprefix uninstall-,$(objects))
 

gitto/config.scm

@@ -0,0 +1,47 @@
+;; -*- 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 rdelim)
+  #:export (read-config))
+
+(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))