diff options
| author | Thomas Munro | 2021-07-12 23:13:48 +0000 |
|---|---|---|
| committer | Thomas Munro | 2021-07-12 23:43:21 +0000 |
| commit | 7c09d2797ecdf779e5dc3289497be85675f3d134 (patch) | |
| tree | 4b223d030bc675e57ae1afde13b0a9217a17e136 /src/bin/psql/help.c | |
| parent | f014b1b9bb8eda4e82c1805969dbae2b07b7d54d (diff) | |
Add PSQL_WATCH_PAGER for psql's \watch command.
Allow a pager to be used by the \watch command. This works but isn't
very useful with traditional pagers like "less", so use a different
environment variable. The popular open source tool "pspg" (also by
Pavel) knows how to display the output if you set PSQL_WATCH_PAGER="pspg
--stream".
To make \watch react quickly when the user quits the pager or presses
^C, and also to increase the accuracy of its timing and decrease the
rate of useless context switches, change the main loop of the \watch
command to use sigwait() rather than a sleeping/polling loop, on Unix.
Supported on Unix only for now (like pspg).
Author: Pavel Stehule <[email protected]>
Author: Thomas Munro <[email protected]>
Discussion: https://postgr.es/m/CAFj8pRBfzUUPz-3gN5oAzto9SDuRSq-TQPfXU_P6h0L7hO%2BEhg%40mail.gmail.com
Diffstat (limited to 'src/bin/psql/help.c')
| -rw-r--r-- | src/bin/psql/help.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/bin/psql/help.c b/src/bin/psql/help.c index 3c250d11cff..d3fda67edd3 100644 --- a/src/bin/psql/help.c +++ b/src/bin/psql/help.c @@ -347,7 +347,7 @@ helpVariables(unsigned short int pager) * Windows builds currently print one more line than non-Windows builds. * Using the larger number is fine. */ - output = PageOutput(158, pager ? &(pset.popt.topt) : NULL); + output = PageOutput(160, pager ? &(pset.popt.topt) : NULL); fprintf(output, _("List of specially treated variables\n\n")); @@ -505,6 +505,10 @@ helpVariables(unsigned short int pager) " alternative location for the command history file\n")); fprintf(output, _(" PSQL_PAGER, PAGER\n" " name of external pager program\n")); +#ifndef WIN32 + fprintf(output, _(" PSQL_WATCH_PAGER\n" + " name of external pager program used for \\watch\n")); +#endif fprintf(output, _(" PSQLRC\n" " alternative location for the user's .psqlrc file\n")); fprintf(output, _(" SHELL\n" |