Modify @(unit, text) operator to return text instead of cstring.

Close #17.

Author: df7cb

Makefile

@@ -7,7 +7,8 @@ DATA = unit_prefixes.data unit_units.data \
 DATA_built = unit--2--3.sql unit--3.sql \
 			 unit--3--4.sql unit--4.sql \
 			 unit--4--5.sql unit--5.sql \
-			 unit--5--6.sql unit--6.sql
+			 unit--5--6.sql unit--6.sql \
+			 unit--6--7.sql unit--7.sql
 REGRESS = extension tables unit unicode prefix units time temperature functions round derived compare aggregate iec custom
 EXTRA_CLEAN = unitparse.yy.* powers powers.o unit-*.dump unitparse.tab.*
 

NEWS.md

@@ -1,6 +1,7 @@
-6.1: Jul 8, 2018
+7.0: Jul ?, 2018
 ----------------
 * Format time using commonyears + days + hh:mm:ss.sss s.
+* Modify @(unit, text) operator to return text instead of cstring.
 * Import definitions.units from GNU units 2.17 with 13 new units.
 * Bison 3 is now required.
 

README.md

@@ -387,7 +387,7 @@ Details:
 
   Rounds a unit value to the nearest integer (in base units).
 
-* **unit @ text: cstring** -- scale conversion, output with unit
+* **unit @ text: text** -- scale conversion, output with unit
 
   Converts a unit value on the left side to the scale of the unit on the right
   side. The units must have the same dimension. The unit on the right side can

debian/changelog

@@ -1,6 +1,7 @@
-postgresql-unit (6.1-1) UNRELEASED; urgency=medium
+postgresql-unit (7.0-1) UNRELEASED; urgency=medium
 
   * Format time using commonyears + days + hh:mm:ss.sss s.
+  * Modify @(unit, text) operator to return text instead of cstring.
   * Import definitions.units from GNU units 2.17 with 13 new units.
   * Bison 3 is now required.
 

unit--6--7.sql.in

@@ -0,0 +1,19 @@
+-- convert @ from (unit, text)->cstring to (unit, text)->text
+
+DROP OPERATOR @ (unit, text);
+DROP FUNCTION unit_at(unit, text);
+
+CREATE FUNCTION unit_at(unit, text)
+	RETURNS text
+	SET search_path = @extschema@
+	AS '$libdir/unit', 'unit_at_text2'
+	LANGUAGE C IMMUTABLE STRICT;
+
+CREATE OPERATOR @ (
+	leftarg = unit,
+	rightarg = text,
+	procedure = unit_at
+);
+
+-- load prefixes and units tables
+SELECT unit_load();