Folks,
Any interest in this?
Best,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778
Remember to vote!
Consider donating to Postgres: http://www.postgresql.org/about/donate
>From 089d48c00ffa6dfd0a6a443e83f6d618c9847deb Mon Sep 17 00:00:00 2001
From: David Fetter <da...@fetter.org>
Date: Sun, 21 Apr 2019 11:08:40 -0700
Subject: [PATCH v1] Add \echo_stderr to psql
To: hackers
MIME-Version: 1.0
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- Does what it says on the label
- Do we have any way to test this?
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index b86764003d..f8481f2e1b 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1879,6 +1879,26 @@ Tue Oct 26 21:40:57 CEST 1999
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><literal>\echo_stderr <replaceable class="parameter">text</replaceable> [ ... ]</literal></term>
+ <listitem>
+ <para>
+ Prints the arguments to the standard error, separated by one
+ space and followed by a newline. This can be useful to
+ intersperse information in the output of scripts when not polluting
+ standard output is desired. For example:
+
+<programlisting>
+=> <userinput>\echo :variable</userinput>
+=> <userinput>\echo_stderr `date`</userinput>
+Sun Apr 21 10:48:11 PDT 2019
+</programlisting>
+ If the first argument is an unquoted <literal>-n</literal> the trailing
+ newline is not written.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><literal>\ef <optional> <replaceable class="parameter">function_description</replaceable> <optional> <replaceable class="parameter">line_number</replaceable> </optional> </optional> </literal></term>
diff --git a/src/bin/psql/command.c b/src/bin/psql/command.c
index 8254d61099..6134c43938 100644
--- a/src/bin/psql/command.c
+++ b/src/bin/psql/command.c
@@ -319,7 +319,7 @@ exec_command(const char *cmd,
status = exec_command_ef_ev(scan_state, active_branch, query_buf, true);
else if (strcmp(cmd, "ev") == 0)
status = exec_command_ef_ev(scan_state, active_branch, query_buf, false);
- else if (strcmp(cmd, "echo") == 0 || strcmp(cmd, "qecho") == 0)
+ else if (strcmp(cmd, "echo") == 0 || strcmp(cmd, "echo_stderr") == 0 || strcmp(cmd, "qecho") == 0)
status = exec_command_echo(scan_state, active_branch, cmd);
else if (strcmp(cmd, "elif") == 0)
status = exec_command_elif(scan_state, cstack, query_buf);
@@ -1114,7 +1114,7 @@ exec_command_ef_ev(PsqlScanState scan_state, bool active_branch,
}
/*
- * \echo and \qecho -- echo arguments to stdout or query output
+ * \echo, \echo_stderr and \qecho -- echo arguments to stdout or query output
*/
static backslashResult
exec_command_echo(PsqlScanState scan_state, bool active_branch, const char *cmd)
@@ -1129,6 +1129,8 @@ exec_command_echo(PsqlScanState scan_state, bool active_branch, const char *cmd)
if (strcmp(cmd, "qecho") == 0)
fout = pset.queryFout;
+ else if (strcmp(cmd, "echo_stderr") == 0)
+ fout = stderr;
else
fout = stdout;
diff --git a/src/bin/psql/help.c b/src/bin/psql/help.c
index d6d41b51d5..b6ef98d00c 100644
--- a/src/bin/psql/help.c
+++ b/src/bin/psql/help.c
@@ -207,6 +207,7 @@ slashUsage(unsigned short int pager)
fprintf(output, _("Input/Output\n"));
fprintf(output, _(" \\copy ... perform SQL COPY with data stream to the client host\n"));
fprintf(output, _(" \\echo [STRING] write string to standard output\n"));
+ fprintf(output, _(" \\echo_stderr [STRING] write string to standard error\n"));
fprintf(output, _(" \\i FILE execute commands from file\n"));
fprintf(output, _(" \\ir FILE as \\i, but relative to location of current script\n"));
fprintf(output, _(" \\o [FILE] send all query results to file or |pipe\n"));
diff --git a/src/bin/psql/tab-complete.c b/src/bin/psql/tab-complete.c
index bcddc7601e..a76be5f068 100644
--- a/src/bin/psql/tab-complete.c
+++ b/src/bin/psql/tab-complete.c
@@ -1406,7 +1406,7 @@ psql_completion(const char *text, int start, int end)
"\\dm", "\\dn", "\\do", "\\dO", "\\dp", "\\dP", "\\dPi", "\\dPt",
"\\drds", "\\dRs", "\\dRp", "\\ds", "\\dS",
"\\dt", "\\dT", "\\dv", "\\du", "\\dx", "\\dy",
- "\\e", "\\echo", "\\ef", "\\elif", "\\else", "\\encoding",
+ "\\e", "\\echo", "\\echo_stderr", "\\ef", "\\elif", "\\else", "\\encoding",
"\\endif", "\\errverbose", "\\ev",
"\\f",
"\\g", "\\gdesc", "\\gexec", "\\gset", "\\gx",
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