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Add new psql help topics, accessible to both --help and \?.

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Add --help=<topic> for the commandline, and \? <topic> as a backslash
command, to show more help than the invocations without parameters
do. "commands", "variables" and "options" currently exist as help
topics describing, respectively, backslash commands, psql variables,
and commandline switches. Without parameters the help commands show
their previous topic.

Some further wordsmithing or extending of the added help content might
be needed; but there seems little benefit delaying the overall feature
further.

Author: Pavel Stehule, editorialized by many

Reviewed-By: Andres Freund, Petr Jelinek, Fujii Masao, MauMau, Abhijit
    Menon-Sen and Erik Rijkers.

Discussion: CAFj8pRDVGuC-nXBfe2CK8vpyzd2Dsr9GVpbrATAnZO=2YQ0s2Q@mail.gmail.com,
    CAFj8pRA54AbTv2RXDTRxiAd8hy8wxmoVLqhJDRCwEnhdd7OUkw@mail.gmail.com
This commit is contained in:
Andres Freund
2014-09-09 22:19:14 +02:00
parent 0709b7ee72
commit 07c8651dd9
6 changed files with 222 additions and 61 deletions
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23
doc/src/sgml/ref/psql-ref.sgml
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@ -560,11 +560,17 @@ EOF
<varlistentry>
<term><option>-?</></term>
<term><option>--help</></term>
<term><option>--help[=<replaceable class="parameter">topic</>]</option></term>
<listitem>
<para>
Show help about <application>psql</application> command line
arguments, and exit.
Show help about <application>psql</application> and exit. The optional
<replaceable class="parameter">topic</> parameter (defaulting
to <literal>options</literal>) selects which part of psql is
explained: <literal>commands</> describes <application>psql</>'s
backslash commands; <literal>options</> describes the commandline
switches that can be passed to <application>psql</>;
and <literal>variables</> shows help about about psql configuration
variables.
</para>
</listitem>
</varlistentry>
@ -2574,10 +2580,17 @@ testdb=&gt; <userinput>\setenv LESS -imx4F</userinput>
<varlistentry>
<term><literal>\?</literal></term>
<term><literal>\? [ <replaceable class="parameter">topic</> ]</literal></term>
<listitem>
<para>
Shows help information about the backslash commands.
Shows help information. The optional
<replaceable class="parameter">topic</> parameter
(defaulting to <literal>commands</>) selects which part of psql is
explained: <literal>commands</> describes <application>psql</>'s
backslash commands; <literal>options</> describes the commandline
switches that can be passed to <application>psql</>;
and <literal>variables</> shows help about about psql configuration
variables.
</para>
</listitem>
</varlistentry>