1 files changed, 47 insertions, 21 deletions
diff --git a/lib/state.lisp b/lib/state.lisp
index b0be21c..5bab3ed 100644
--- a/lib/state.lisp
+++ b/lib/state.lisp
@@ -15,7 +15,6 @@
 ;; You should have received a copy of the GNU Affero General Public License
 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-
 (in-package :oneliners.cli)
 
 ;;; Config Struct
@@ -32,6 +31,36 @@
 (defvar *cache* nil
   "Holds cached oneliners as a list.")
 
+;;; LOADING AND SAVING STATE
+
+(defun config-file ()
+  "Returns the pahtname holding the location of the config file."
+  (merge-pathnames ".config/oneliners.config" (user-homedir-pathname)))
+
+(defun cached-oneliners-file ()
+  "Returns the pathname holding the location of the cache."
+  (merge-pathnames ".cache/oneliners.cache" (user-homedir-pathname)))
+
+(defun wipe-cache ()
+  "Deletes the cache, if present."
+  (uiop:delete-file-if-exists (cached-oneliners-file)))
+
+(defun write-config-to-disk ()
+  (print-to-file *config* (config-file)))
+
+(defun write-cache-to-disk ()
+  (print-to-file *cache* (cached-oneliners-file)))
+
+(defun read-config-file ()
+  "Read a configuration from the location returned by CONFIG-FILE. NIL
+if there is no such file"
+  (read-from-file (config-file)))
+
+(defun read-cache-file ()
+  "Read the cache from the location returned by
+CACHED-ONELINERS-FILE. NIL if there is no such file."
+  (read-from-file (cached-oneliners-file)))
+
 ;;; GETTING AND SETTING STATE, DYNAMICALLY BOUND
 
 (defun merge-oneliners (new)
@@ -56,23 +85,20 @@
                (string #'oneliner-name))
         :test #'equal))
 
-;;; LOADING AND SAVING STATE
-
-(defun config-file ()
-  "Returns the pahtname holding the location of the config file."
-  (merge-pathnames ".config/oneliners.config" (user-homedir-pathname)))
-
-(defun cached-oneliners-file ()
-  "Returns the pathname holding the location of the cache."
-  (merge-pathnames ".cache/oneliners.cache" (user-homedir-pathname)))
-
-(defun wipe-cache ()
-  "Deletes the cache, if present."
-  (uiop:delete-file-if-exists (cached-oneliners-file)))
-
-(defun write-config-to-disk ()
-  (print-to-file *config* (config-file)))
-
-(defun write-cache-to-disk ()
-  (print-to-file *cache* (cached-oneliners-file)))
-
+;;; STATE LOADING MACRO
+
+(defmacro with-local-state (&body body)
+  "Binds the *config* and *cache* dynamic variables from disk, and
+sets the api's *host* variable. If BODY produces no errors, the "
+  `(let* ((*config* (read-config-file))
+          (*cache* (read-cache-file))
+          (api::*host* (config-host *config*)))
+     (assert *host* () "ol must be configured with a server host.")
+     (handler-case
+         (progn
+           ,@body
+           ;; only if there is no error do we save the local state.
+           (write-cache-to-disk) 
+           (write-config-to-disk)))
+     (error (e)
+            (format *error-output* "~a~%" e))))