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In psql, use PSQL_PAGER in preference to PAGER, if it's set.

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This allows the user's environment to set up a psql-specific choice
of pager, in much the same way that we provide PSQL_EDITOR to allow
a psql-specific override of the more widely known EDITOR variable.

Pavel Stehule, reviewed by Thomas Munro

Discussion: https://postgr.es/m/CAFj8pRD3RRk9S1eRbnGm_T6brc3Ss5mohraNzTSJquzx+pmtKA@mail.gmail.com
This commit is contained in:
Tom Lane 2017-09-05 12:02:06 -04:00
parent ebd346caf4
commit 5e8304fdce
4 changed files with 39 additions and 27 deletions
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51
doc/src/sgml/ref/psql-ref.sgml
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@ -2665,10 +2665,10 @@ lo_import 152801
<listitem>
<para>
Controls use of a pager program for query and <application>psql</>
help output. If the environment variable <envar>PAGER</envar>
is set, the output is piped to the specified program.
Otherwise a platform-dependent default (such as
<filename>more</filename>) is used.
help output. If the environment variable <envar>PSQL_PAGER</envar>
or <envar>PAGER</envar> is set, the output is piped to the
specified program. Otherwise a platform-dependent default program
(such as <filename>more</filename>) is used.
</para>
<para>
@ -4106,21 +4106,6 @@ $endif
</listitem>
</varlistentry>
<varlistentry>
<term><envar>PAGER</envar></term>
<listitem>
<para>
If the query results do not fit on the screen, they are piped
through this command. Typical values are
<literal>more</literal> or <literal>less</literal>. The default
is platform-dependent. Use of the pager can be disabled by setting
<envar>PAGER</envar> to empty, or by using pager-related options of
the <command>\pset</command> command.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>PGDATABASE</envar></term>
<term><envar>PGHOST</envar></term>
@ -4145,11 +4130,8 @@ $endif
and <command>\ev</command> commands.
These variables are examined in the order listed;
the first that is set is used.
</para>
<para>
The built-in default editors are <filename>vi</filename> on Unix
systems and <filename>notepad.exe</filename> on Windows systems.
If none of them is set, the default is to use <filename>vi</filename>
on Unix systems or <filename>notepad.exe</filename> on Windows systems.
</para>
</listitem>
</varlistentry>
@ -4192,6 +4174,27 @@ PSQL_EDITOR_LINENUMBER_ARG='--line '
</listitem>
</varlistentry>
<varlistentry>
<term><envar>PSQL_PAGER</envar></term>
<term><envar>PAGER</envar></term>
<listitem>
<para>
If a query's results do not fit on the screen, they are piped
through this command. Typical values are <literal>more</literal>
or <literal>less</literal>.
Use of the pager can be disabled by setting <envar>PSQL_PAGER</envar>
or <envar>PAGER</envar> to an empty string, or by adjusting the
pager-related options of the <command>\pset</command> command.
These variables are examined in the order listed;
the first that is set is used.
If none of them is set, the default is to use <literal>more</> on most
platforms, but <literal>less</> on Cygwin.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>PSQLRC</envar></term>

4
src/bin/psql/help.c
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@ -459,8 +459,6 @@ helpVariables(unsigned short int pager)
fprintf(output, _(" COLUMNS\n"
" number of columns for wrapped format\n"));
fprintf(output, _(" PAGER\n"
" name of external pager program\n"));
fprintf(output, _(" PGAPPNAME\n"
" same as the application_name connection parameter\n"));
fprintf(output, _(" PGDATABASE\n"
@ -481,6 +479,8 @@ helpVariables(unsigned short int pager)
" how to specify a line number when invoking the editor\n"));
fprintf(output, _(" PSQL_HISTORY\n"
" alternative location for the command history file\n"));
fprintf(output, _(" PSQL_PAGER, PAGER\n"
" name of external pager program\n"));
fprintf(output, _(" PSQLRC\n"
" alternative location for the user's .psqlrc file\n"));
fprintf(output, _(" SHELL\n"

4
src/fe_utils/print.c
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@ -2870,7 +2870,9 @@ PageOutput(int lines, const printTableOpt *topt)
const char *pagerprog;
FILE *pagerpipe;
pagerprog = getenv("PAGER");
pagerprog = getenv("PSQL_PAGER");
if (!pagerprog)
pagerprog = getenv("PAGER");
if (!pagerprog)
pagerprog = DEFAULT_PAGER;
else

7
src/interfaces/libpq/fe-print.c
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@ -165,6 +165,13 @@ PQprint(FILE *fout, const PGresult *res, const PQprintOpt *po)
screen_size.ws_row = 24;
screen_size.ws_col = 80;
#endif
/*
* Since this function is no longer used by psql, we don't examine
* PSQL_PAGER. It's possible that the hypothetical external users
* of the function would like that to happen, but in the name of
* backwards compatibility, we'll stick to just examining PAGER.
*/
pagerenv = getenv("PAGER");
/* if PAGER is unset, empty or all-white-space, don't use pager */
if (pagerenv != NULL &&