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Add \warn command to psql.

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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/20190421183115.GA4311@fetter.org
This commit is contained in:
Tom Lane
2019-07-05 12:32:36 -04:00
parent e8fdcacc6c
commit 02e95a5049
6 changed files with 62 additions and 11 deletions
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7
src/bin/psql/help.c
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@ -169,7 +169,7 @@ slashUsage(unsigned short int pager)
* Use "psql --help=commands | wc" to count correctly. It's okay to count
* the USE_READLINE line even in builds without that.
*/
output = PageOutput(127, pager ? &(pset.popt.topt) : NULL);
output = PageOutput(128, pager ? &(pset.popt.topt) : NULL);
fprintf(output, _("General\n"));
fprintf(output, _(" \\copyright show PostgreSQL usage and distribution terms\n"));
@ -206,11 +206,12 @@ 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 [-n] [STRING] write string to standard output (-n for no newline)\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"));
fprintf(output, _(" \\qecho [STRING] write string to query output stream (see \\o)\n"));
fprintf(output, _(" \\qecho [-n] [STRING] write string to \\o output stream (-n for no newline)\n"));
fprintf(output, _(" \\warn [-n] [STRING] write string to standard error (-n for no newline)\n"));
fprintf(output, "\n");
fprintf(output, _("Conditional\n"));