[ADD]Hy Base : new macros

* For computed fields ;
* For migrations.

odoo.hy

@@ -15,8 +15,9 @@
 ;;    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/>.
 
-" Odoo XML macros "
+" Odoo macros "
 
+(import [os [path]])
 (import logging [odoo.addons.hy_base.xml [*]])
 (setv logger (.getLogger logging __name__))
 
@@ -27,6 +28,8 @@
     python2-form
     python3-form))
 
+; XML helpers functions and macros
+
 (defn ox-odoo [&rest args] (xmlroot (xmln "odoo" {} #*args)))
 (defn ox-data [&rest args] (xmln "data" {} #*args))
 (defn ox-record [&rest args] (xmln "record" #*args))
@@ -95,3 +98,27 @@
            ~g!fpath (+ ~g!output-path "/" ~filename))
      (.debug logger (+ "Hy XML DSL : compiling " ~filename " to " ~g!output-path))
      (with [f (open ~g!fpath "w")] (.write f ~g!output-xml))))
+
+; Odoo Backend macros
+
+(defmacro/g! compute-fn [field dependencies body]
+  "Macro to make computed definition smoother"
+  (setv fname f"_compute_{(mangle field)}" descr f"Computes {field}")
+  `(do
+     (import [hy.models [HySymbol]])
+     (with-decorator (.depends api ~@dependencies)
+       (defn ~(HySymbol fname) [self]
+         ~descr
+         ~body))))
+
+(defmacro compute-field [fname body]
+  (setv fn-name f"_compute_{(mangle fname)}")
+  `(setv ~fname (~@body :compute ~fn-name)))
+
+; Migrations
+
+(defn generate-fn-name [filepath]
+  "Generate function name from filepath"
+  (setv version (.replace (get (.split (.dirname path filepath) "/") -1) "." "_")
+        pre-post (get (.split (.basename path filepath) "-") 0))
+  f"{pre-post}_{version}")