Add \warn command to psql.

This is like \echo except that the text is sent to stderr not stdout.

In passing, fix a pre-existing bug in \echo and \qecho: per documentation
the -n switch should only be recognized when it is the first argument,
but actually any argument matching "-n" was treated as a switch.
(Should we back-patch that?)

David Fetter (bug fix by me), reviewed by Fabien Coelho

Discussion: https://postgr.es/m/[email protected]

2 files changed, 35 insertions, 0 deletions

diff --git a/src/test/regress/expected/psql.out b/src/test/regress/expected/psql.out
index 4bcf0cc5dfd..9021c808dcf 100644
--- a/src/test/regress/expected/psql.out
+++ b/src/test/regress/expected/psql.out
@@ -4180,6 +4180,25 @@ drop table psql_serial_tab;
 \pset format aligned
 \pset expanded off
 \pset border 1
+-- \echo and allied features
+\echo this is a test
+this is a test
+\echo -n without newline
+without newline\echo with -n newline
+with -n newline
+\echo '-n' with newline
+-n with newline
+\set foo bar
+\echo foo = :foo
+foo = bar
+\qecho this is a test
+this is a test
+\qecho foo = :foo
+foo = bar
+\warn this is a test
+this is a test
+\warn foo = :foo
+foo = bar
 -- tests for \if ... \endif
 \if true
   select 'okay';
diff --git a/src/test/regress/sql/psql.sql b/src/test/regress/sql/psql.sql
index 26f436ae403..cefe41bdc2e 100644
--- a/src/test/regress/sql/psql.sql
+++ b/src/test/regress/sql/psql.sql
@@ -771,6 +771,22 @@ drop table psql_serial_tab;
 \pset expanded off
 \pset border 1
 
+-- \echo and allied features
+
+\echo this is a test
+\echo -n without newline
+\echo with -n newline
+\echo '-n' with newline
+
+\set foo bar
+\echo foo = :foo
+
+\qecho this is a test
+\qecho foo = :foo
+
+\warn this is a test
+\warn foo = :foo
+
 -- tests for \if ... \endif
 
 \if true