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diff --git a/README.org b/README.org
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+* Gitto
+
+  For lack of a better title.
+
+  My simple utility to keep track of all the git repositories I have
+  on my computer(s). Also an experiment in writing scheme.
+
+  Written for ~guile~ 2.0.x
diff --git a/gitto.scm b/gitto.scm
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+#! /usr/guile-2.0/bin/guile \
+-e main -s
+!#
+(use-modules (ice-9 format)
+             (ice-9 getopt-long)
+             (ice-9 popen)
+             (ice-9 rdelim))
+
+(define data-dir
+  (string-append (or (getenv "XDG_DATA_HOME") "~/.local/share")
+                 "/gitracker"))
+
+(define repositories-file
+  (string-append data-dir "/repos.scm"))
+
+(define repositories
+  (if (file-exists? repositories-file)
+      (let* ((port (open-input-file repositories-file))
+             (result (read port)))
+        (close-port port)
+        result)
+      '()))
+
+(define (version)
+  "Display version information"
+  (display "gitter version 0.1\n"))
+
+(define (help)
+  "Display some help."
+  (display "\
+gitter [options]
+  -r, --register REPO  Register a new repository directory
+  -v, --version        Display version
+  -h, --help           Display this help
+"))
+
+(define (git-dir? dir)
+  "Check whether or not DIR/.git exists"
+  (let ((dir (string-append dir "/.git")))
+    (if (file-exists? dir)
+        (let ((dirstat (stat dir)))
+          (eq? (stat:type dirstat) 'directory))
+        #f)))
+
+(define (save-repositories-list)
+  "Save the list of repositories."
+  (if (not (file-exists? data-dir))
+      (mkdir data-dir))
+
+  (let ((port (open-output-file repositories-file)))
+    (write repositories port)
+    (close-port port)))
+
+(define (register-repository repository)
+  (if (not (member repository repositories))
+      (begin
+        (set! repositories (append `(,repository)
+                                   repositories))
+        (save-repositories-list)
+        (simple-format #t "Repository ~A registered." repository))
+      (display "Repository already registered."))
+  (newline))
+
+(define (git-revs-to-push)
+  (let* ((response (open-input-pipe "git log --pretty=oneline @{u}.. | wc -l"))
+         (num (string->number (read-line response))))
+    (close-pipe response)
+    num))
+
+(define (git-revs-to-pull)
+  (let* ((response (open-input-pipe "git log --pretty=oneline ..@{u} | wc -l"))
+         (num (string->number (read-line response))))
+    (close-pipe response)
+    num))
+
+(define (git-clean?)
+  (let* ((response (open-input-pipe "git status -suno"))
+         (clean? (eof-object? (read-delimited "" response))))
+    (close-pipe response)
+    clean?))
+
+(define (list-repositories)
+  (for-each (lambda (repo)
+              (chdir repo)
+              (let ((numup (git-revs-to-push))
+                    (numdown (git-revs-to-pull))
+                    (clean? (git-clean?)))
+                (format #t "~a: ~d to push, ~d to pull and is ~adirty.\n"
+                        (basename repo) numup numdown
+                        (if clean? "not " ""))))
+            repositories))
+
+(define option-spec
+  `((version  (single-char #\v) (value #f))
+    (help     (single-char #\h) (value #f))
+    (register (single-char #\r) (value #t)
+              (predicate ,git-dir?))))
+
+(define (main args)
+  (let* ((options (getopt-long args option-spec))
+         (help-wanted (option-ref options 'help #f))
+         (version-wanted (option-ref options 'version #f))
+         (registration-needed (option-ref options 'register #f)))
+    (cond (version-wanted (version))
+          (help-wanted (help))
+          (registration-needed => register-repository)
+          (#t (list-repositories)))))