Use legobricks as example and test custom units

Author: df7cb

Makefile

@@ -5,7 +5,7 @@ DATA = unit_prefixes.data unit_units.data \
 	   unit--1.sql unit--1--2.sql \
 	   unit--2.sql
 DATA_built = unit--2--3.sql unit--3.sql
-REGRESS = extension tables unit prefix units temperature functions derived compare aggregate iec
+REGRESS = extension tables unit prefix units temperature functions derived compare aggregate iec custom
 EXTRA_CLEAN = unitparse.yy.* powers powers.o unit-*.dump # unitparse.tab.*
 
 PG_CONFIG = pg_config

README.md

@@ -171,7 +171,7 @@ User-Defined Units
 To create custom prefixes and units, insert new rows into the tables:
 
 ```
-# select '1 foobar'::unit;
+# SELECT '1 foobar'::unit;
 ERROR:  unit "foobar" is not known
 # INSERT INTO unit_prefixes VALUES ('foo', 42);
 INSERT 0 1
@@ -180,12 +180,11 @@ INSERT 0 1
 ---------
  4.2 MPa
 
-# INSERT INTO unit_units VALUES ('footballfieldsize', '68m * 105m');
-INSERT 0 1
-# SELECT '1 hectare'::unit @ 'footballfieldsize' AS one_hectare;
-            one_hectare
-------------------------------------
- 1.40056022408964 footballfieldsize
+# INSERT INTO unit_units VALUES ('legobrick', '9.6 mm');
+# SELECT '1 m'::unit @ 'legobricks' AS one_meter;
+          one_meter
+-----------------------------
+ 104.166666666667 legobricks
 ```
 
 Input Syntax

expected/custom.out

@@ -0,0 +1,54 @@
+SELECT '1 foobar'::unit;
+ERROR:  unit "foobar" is not known
+LINE 1: SELECT '1 foobar'::unit;
+               ^
+SELECT unit_is_hashed('foobar');
+ unit_is_hashed 
+----------------
+ f
+(1 row)
+
+INSERT INTO unit_prefixes VALUES ('foo', 42);
+SELECT '1 foobar'::unit;
+  unit   
+---------
+ 4.2 MPa
+(1 row)
+
+SELECT unit_is_hashed('foobar');
+ unit_is_hashed 
+----------------
+ t
+(1 row)
+
+SELECT * FROM unit_prefixes WHERE dump;
+ prefix | factor | definition | dump 
+--------+--------+------------+------
+ foo    |     42 |            | t
+(1 row)
+
+INSERT INTO unit_units VALUES ('legobrick', '9.6 mm');
+SELECT unit_is_hashed('legobricks');
+ unit_is_hashed 
+----------------
+ f
+(1 row)
+
+SELECT '1 m'::unit @ 'legobricks' AS one_meter;
+          one_meter          
+-----------------------------
+ 104.166666666667 legobricks
+(1 row)
+
+SELECT unit_is_hashed('legobricks');
+ unit_is_hashed 
+----------------
+ t
+(1 row)
+
+SELECT * FROM unit_units WHERE dump;
+   name    |  unit  | shift | definition | dump 
+-----------+--------+-------+------------+------
+ legobrick | 9.6 mm |       |            | t
+(1 row)
+

sql/custom.sql

@@ -0,0 +1,12 @@
+SELECT '1 foobar'::unit;
+SELECT unit_is_hashed('foobar');
+INSERT INTO unit_prefixes VALUES ('foo', 42);
+SELECT '1 foobar'::unit;
+SELECT unit_is_hashed('foobar');
+SELECT * FROM unit_prefixes WHERE dump;
+
+INSERT INTO unit_units VALUES ('legobrick', '9.6 mm');
+SELECT unit_is_hashed('legobricks');
+SELECT '1 m'::unit @ 'legobricks' AS one_meter;
+SELECT unit_is_hashed('legobricks');
+SELECT * FROM unit_units WHERE dump;