NAME¶
Env::PS1 - prompt string formatter
SYNOPSIS¶
# use the import function
use Env::PS1 qw/$PS1/;
$ENV{PS1} = '\u@\h \$ ';
print $PS1;
$readline = <STDIN>;
# or tie it yourself
tie $prompt, 'Env::PS1', 'PS1';
# you can also tie a scalar ref
$format = '\u@\h\$ ';
tie $prompt, 'Env::PS1', \$format;
DESCRIPTION¶
This package supplies variables that are "tied" to environment
variables like 'PS1' and 'PS2', if read it takes the contents of the variable
as a format string like the ones
bash(1) uses to
format the prompt.
It is intended to be used in combination with the various ReadLine packages.
EXPORT¶
You can request for arbitrary variables to be exported, they will be tied to the
environment variables of the same name.
TIE¶
When you "tie" a variable you can supply one argument which can either
be the name of an environement variable or a SCALAR reference. This argument
defaults to 'PS1'.
METHODS¶
- "sprintf($format)"
- Returns the formatted string.
Using this method all the time is a lot less efficient then using the
tied variable, because the tied variable caches parts of the format that
remain the same anyway.
The format is copied mostly from
bash(1) because that's what it is
supposed to be compatible with. We made some private extensions which
obviously are not portable.
Note that this is not the prompt format as specified by the posix specification,
that would only know "!" for the history number and "!!"
for a literal "!".
Apart from the escape sequences you can also use environment variables in the
format string; use $VAR or "${VAR}".
The following escape sequences are recognized:
- \a
- The bell character, identical to "\007"
- \d
- The date in "Weekday Month Date" format
- \D{format}
- The date in strftime(3) format, uses POSIX
- \e
- The escape character, identical to "\033"
- \n
- Newline
- \r
- Carriage return
- \s
- The basename of $0
- \t
- The current time in 24-hour format, identical to
"\D{%H:%M:%S}"
- \T
- The current time in 12-hour format, identical to
"\D{%I:%M:%S}"
- \@
- The current time in 12-hour am/pm format, identical to
"\D{%I:%M %p}"
- \A
- The current time in short 24-hour format, identical to
"\D{%H:%M}"
- \u
- The username of the current user
- \w
- The current working directory
- \W
- The basename of the current working directory
- \$
- "#" for effective uid is 0 (root), else
"$"
- \0dd
- The character corresponding to the octal number 0dd
- \\
- Literal backslash
- \H
- Hostname, uses Sys::Hostname
- \h
- First part of the hostname
- \l
- The basename of the (output) terminal device name, uses
POSIX, but won't be really portable.
- \[ \]
- These are used to encapsulate a sequence of non-printing
chars. Since we don't need that, they are removed.
Extensions¶
The following escapes are extensions not supported by bash, and are not
portable:
- \L
- The (output) terminal device name, uses POSIX, but won't be
really portable.
- \C{colour}
- Insert the ANSI sequence for named colour. Known colours
are: black, red, green, yellow, blue, magenta, cyan and white; background
colours prefixed with "on_". Also known are reset, bold, dark,
underline, blink and reverse, although the effect depends on the terminla
you use.
Unless you want the whole commandline coloured you should end your prompt
with "\C{reset}".
Of course you can still use the "raw" ansi escape codes for these
colours.
Note that "bold" is sometimes also known as "bright", so
"\C{bold,black}" will on some terminals render dark grey.
If the environment variable "CLICOLOR" is defined but false
colours are switched off automaticly.
- \P{format}
- Proc information.
All of these are unix specific
- %a
- Acpi AC status '+' or '-' for connected or not, linux
specific
- %b
- Acpi battery status in mWh, linux specific
- %L
- Load average
- %l
- First number of the load average
- %t
- Acpi temperature, linux specific
- %u
- Uptime
- %w
- Number of users logged in
Not implemented escapes¶
The following escapes are not implemented, because they are application
specific.
- \j
- The number of jobs currently managed by the
application.
- \v
- The version of the application.
- \V
- The release number of the application, version +
patchelvel
- \!
- The history number of the next command.
This escape gets replaced by literal '!' while a literal '!' gets replaces
by '!!'; this makes the string a posix compatible prompt, thus it will
work if your readline module expects a posix prompt.
- \#
- The command number of the next command (like history
number, but minus the lines read from the history file).
Customizing¶
If you want to overload escapes or want to supply values for the application
specific escapes you can put them in %Env::PS1::map, the key is the escape
letter, the value either a string or a CODE ref. If you map a CODE ref it
normally is called every time the prompt string is read. When the escape is
followed by an argument in the format string (like "\D{argument}")
the CODE ref is called only once when the string is cached, but in that case
it may in turn return a CODE ref.
BUGS¶
Please mail the author if you encounter any bugs.
AUTHOR¶
Jaap Karssenberg || Pardus [Larus] <pardus@cpan.org>
This module is currently maintained by Ryan Niebur <rsn@cpan.org>
Copyright (c) 2004 Jaap G Karssenberg. All rights reserved. Copyright (c) 2009
Ryan Niebur. This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
SEE ALSO¶
Env, Term::ReadLine::Zoid