1 files changed, 135 insertions, 0 deletions
diff --git a/src/cli.lisp b/src/cli.lisp
new file mode 100644
index 0000000..2f03425
--- /dev/null
+++ b/src/cli.lisp
@@ -0,0 +1,135 @@
+(in-package :ybackup)
+
+#|
+(defun fetch-configuration ()
+  (let ((xdg (uiop:getenv "XDG_CONFIG_DIR")))
+    (if xdg
+        (setf xdg (concatenate 'string xdg "/ybackup.lisp"))
+        (setf xdg (concatenate 'string (uiop:getenv "HOME") "/.config/ybackup.lisp")))
+    (ensure-directories-exist xdg)
+    (with-open-file (file xdg :if-does-not-exist :create)
+      (uiop:with-safe-io-syntax
+          (uiop:slurp-stream-form :at nil)))))
+|#
+(opts:define-opts
+  (:name :help
+   :description "Print this text"
+   :short #\h
+   :long "help")
+  (:name :backup
+   :description "Directory to backup"
+   :short #\b
+   :long "backup"
+   :arg-parser #'identity
+   :meta-var "DIRECTORY")
+  (:name :read
+   :description "Read a backup to a directory"
+   :short #\r
+   :long "read"
+   :arg-parser #'identity
+   :meta-var "DIRECTORY")
+  (:name :list-files
+   :description "List the files in the repository."
+   :short #\l
+   :long "list")
+  (:name :file-backend
+   :description
+   "Use this for a file-based local backup. The argument is the directory that will
+contain the ERIS chunks."
+   :long "file-backend"
+   :arg-parser #'identity
+   :meta-var "DIRECTORY")
+  (:name :http-backend
+   :description
+   "Use this for an HTTP-based backup. The argument is the URL which will accept
+the ERIS chunks."
+   :long "http"
+   :arg-parser #'identity
+   :meta-var "URL")
+  (:name :backend
+   :description "An S-expression that returns a valid eris:backend object."
+   :long "backend"
+   :meta-var "SEXP"
+   :arg-parser #'read-from-string)
+  (:name :filter
+   :description
+   "A one-argument lambda S-expression that takes a filename as an argument and
+returns nil if the file is to be read or t if it is to be skipped."
+   :long "filter"
+   :meta-var "SEXP"
+   :arg-parser #'read-from-string)
+  (:name :overwrite
+   :description "Set if the program should overwrite existing files when writing from backup. "
+   :long "overwrite")
+  (:name :incremental
+   :description "Set to enable incremental backup. Requires the --repo optio.."
+   :short #\i
+   :long "incremental")
+  (:name :repo
+   :description "The file that the URN will be written or read from."
+   :long "repo"
+   :meta-var "FILE OR URN"
+   :arg-parser #'identity)
+  (:name :secret
+   :description "The secret used for encryption."
+   :long "secret"
+   :short #\s
+   :meta-var "SECRET"
+   :arg-parser #'identity)
+  (:name :metadata
+   :description "Print repository metadata when reading or listing files."
+   :long "metadata"
+   :short #\m))
+
+(defun file-or-urn-to-urn (file-or-urn)
+  (if (string-prefix-p "urn:" file-or-urn)
+      file-or-urn
+      (with-open-file (file file-or-urn :direction :input :if-does-not-exist :error)
+        (read-line file))))
+
+(defun main ()
+  (restart-case (destructuring-bind (&key help backup read list-files
+                                       file-backend http-backend backend
+                                       filter overwrite incremental repo
+                                       secret metadata)
+                    (opts:get-opts)
+                  ;; some sanity checks
+                  ;; exclusive options
+                  (when (or (and backup read) (and backup list-files) (and read list-files))
+                    (error "Choose one of read, backup, or list."))
+                  (when (or (and backend http-backend) (and backend file-backend) (and file-backend http-backend))
+                    (error "Choose one backend."))
+
+                  (when help
+                    (opts:describe :prefix #.(format nil "ybackup version ~a" version))
+                    (opts:exit))
+
+                  ;; repo argument necessary except for backup
+                  #|(when (and (not repo) backup)
+                    (error "Please provide --repo argument."))|#
+
+                  ;; don't save urns to files named urn:
+                  #|(when (and backup repo (string-prefix-p "urn:" repo))
+                    (error "No urns as filenames."))|#
+
+                  (let ((backend
+                          (cond
+                            (file-backend (make-instance 'eris:file-backend :directory file-backend))
+                            (http-backend (error "Unimplemented http-backend."))
+                            (backend (eval backend))
+                            (t (error "Choose backend.")))))
+                    ;; TODO:
+                    ;; ADD METADATA, SECRET HANDLING (!!!)
+                    
+                    (cond
+                      (list-files
+                       (print (list-files (file-or-urn-to-urn repo) backend))
+                       ())
+                      (backup (let ((urn (make-backup backup backend :incremental incremental)))
+                                (if repo (with-open-file (file repo :direction :output :if-does-not-exist :create
+                                                               :if-exists :new-version)
+                                           (write-string urn file))
+                                    (princ urn))))
+                      (read (read-backup (file-or-urn-to-urn repo) backend read :overwrite overwrite)))
+                    (opts:exit)))
+    (exit () (opts:exit))))