NAME
    rainbarf - CPU/RAM/battery stats chart bar for tmux (and GNU screen)

VERSION
    version 0.4

SYNOPSIS
     rainbarf --tmux --width 40 --no-battery

DESCRIPTION
    Fancy resource usage charts to put into the tmux
    <http://tmux.sourceforge.net/> status line. The CPU utilization history
    chart is tinted with the following colors to reflect the system memory
    allocation:

    *   green: free memory;

    *   yellow: active memory;

    *   blue: inactive memory;

    *   red: wired memory on *Mac OS X*;

    *   cyan: cached memory on *Linux*.

    If available, battery charge is displayed on the right.

    Just go to <https://github.com/creaktive/rainbarf> to see some
    screenshots.

USAGE
  Installation
     perl Build.PL
     ./Build test
     ./Build install

  Configuration
    Add the following line to your ~/.tmux.conf file:

     set -g status-right '#(rainbarf)'

    Or, under *GNOME Terminal*:

     set -g status-right '#(rainbarf --bright)'

    Reload the tmux config by running "tmux source-file ~/.tmux.conf".

OPTIONS
    --help
        This.

    --[no]battery
        Display the battery charge indicator.

    --[no]bolt
        Display even fancier battery indicator.

    --[no]bright
        Tricky one. Disabled by default. See "CAVEAT".

    --fg COLOR_NAME
        Force chart foreground color.

    --bg COLOR_NAME
        Force chart background color.

    --[no]loadavg
        Use load average <https://en.wikipedia.org/wiki/Load_(computing)>
        metric instead of CPU utilization. You might want to set the "--max"
        threshold since this is an absolute value and has varying ranges on
        different systems.

    --max NUMBER
        Maximum "loadavg" you expect before rescaling the chart. Default is
        1.

    --order INDEXES
        Specify the memory usage bar order. The default is "fwaic" ( free,
        wired, active, inactive & cached ).

    --[no]tmux
        Force "tmux" colors mode. By default, rainbarf detects automatically
        if it is being called from "tmux" or from the interactive shell.

    --screen
        screen(1)
        <http://manpages.ubuntu.com/manpages/hardy/man1/screen.1.html>
        colors mode. Experimental. See "CAVEAT".

    --width NUMBER
        Chart width. Default is 38, so both the chart and the battery
        indicator fit the "tmux" status line. Higher values may require
        disabling the battery indicator or raising the "status-right-length"
        value in ~/.tmux.conf.

CAVEAT
  Color scheme
    If you only see the memory usage bars but no CPU utilization chart,
    that's because your terminal's color scheme need an explicit distinction
    between foreground and background colors. For instance, "red on red
    background" will be displayed as a red block on such terminals. Thus,
    you may need the ANSI bright attribute for greater contrast. There are
    two problems with it, though:

    1.  Other color schemes (notably, solarized
        <http://ethanschoonover.com/solarized>) have different meaning for
        the ANSI bright attribute. So using it will result in a quite
        psychedelic appearance.

    2.  The older versions of Term::ANSIColor dependency do not recognize it
        at all, resulting in a confusing error message *Invalid attribute
        name bright_yellow at ...*. However, the whole Term::ANSIColor is
        optional, it is only required to preview the effects of the
        "OPTIONS" via command line before actually editing the ~/.tmux.conf.
        That is, "rainbarf --bright --tmux" is guaranteed to work despite
        the outdated Term::ANSIColor!

  Persistent storage
    CPU utilization stats are persistently stored in the ~/.rainbarf.dat
    file. Every rainbarf execution will update and rotate that file. Since
    "tmux" calls rainbarf periodically (every 15 seconds, by default), the
    chart will display CPU utilization for the last ~9.5 minutes (15 * 38).
    Thus, several "tmux" instances running simultaneously for the same user
    will result in a faster chart scrolling.

  screen
    Stable "screen" version unfortunately has a broken UTF-8 handling
    specifically for the status bar. Thus, I have only tested the rainbarf
    with the variant from <git://git.savannah.gnu.org/screen.git>. My
    ~/.screenrc contents:

     backtick 1 15 15 rainbarf --bright --screen
     hardstatus string "%1`"
     hardstatus lastline

REFERENCES
    *   top(1)
        <http://developer.apple.com/library/mac/documentation/Darwin/Referen
        ce/ManPages/man1/top.1.html> is used to get the CPU/RAM stats if no
        /proc filesystem is available.

    *   ioreg(8)
        <http://developer.apple.com/library/mac/documentation/Darwin/Referen
        ce/ManPages/man8/ioreg.8.html> is used to get the battery status on
        *Mac OS X*.

    *   ACPI <http://www.tldp.org/howto/acpi-howto/usingacpi.html> is used
        to get the battery status on *Linux*.

    *   Battery <https://github.com/Goles/Battery> was a source of
        inspiration.

    *   Spark <http://zachholman.com/spark/> was another source of
        inspiration.

AUTHOR
    Stanislaw Pusep <stas@sysd.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2013 by Stanislaw Pusep <stas@sysd.org>.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.