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Allow invisible PROMPT2 in psql.

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Keep track of the visible width of PROMPT1, and provide %w as a way
for PROMPT2 to generate the same number of spaces.

Author: Thomas Munro, with ideas from others
Reviewed-by: Tom Lane (earlier version)
Discussion: https://postgr.es/m/CA%2BhUKG%2BzGd7RigjWbxwhzGW59gUpf76ydQECeGdEdodH6nd__A%40mail.gmail.com
This commit is contained in:
Thomas Munro
2019-11-19 15:17:15 +13:00
parent cec2edfa78
commit 7f338369ca
2 changed files with 64 additions and 0 deletions
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12
doc/src/sgml/ref/psql-ref.sgml
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@ -4310,6 +4310,18 @@ testdb=> \set PROMPT1 '%[%033[1;33;40m%]%n@%/%R%[%033[0m%]%# '
</listitem>
</varlistentry>
<varlistentry>
<term><literal>%w</literal></term>
<listitem>
<para>
Whitespace of the same width as the most recent output of
<varname>PROMPT1</varname>. This can be used as a
<varname>PROMPT2</varname> setting, so that multi-line statements are
aligned with the first line, but there is no visible secondary prompt.
</para>
</listitem>
</varlistentry>
</variablelist>
To insert a percent sign into your prompt, write