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                habit README

As habit is just a script much of this README is taken from the script itself.
We hope you will find this script useful in a variety of contexts and let us
know how you use it.

# habit         Script to mark actions

This script records user defined actions. You can set the actions you wish to
record in a file named ~/.habit.conf one per line. Data is recorded in
~/.habit.log.  When you run the program and select, record or "mark" any action
a new line is written to the log with the action name and current time. The
exact information recorded is described below.

Choosing an action can be done interactively or provided on the command line.
This enables the habit script to be run as a command by other scripts.

When you mark an action you can optionally run a script.  Originally this
feature was used to play music but anything that can be done at the command
line can be executed. This is a potential security risk so please use this
feature with care.

    For further information see http://activehabits.com

# Author:	Grant Bowman <[email protected]>
#
# Config Spec:  each line (no blanks please) in habit.conf is an action name such as
#                       action1
# Script Spec: commands are sourced and run for each action like .habit.action1
#                       mpg321 "song.mp3"
#
# Display: Software exists for making better graphs of this data.
#          Gnumeric Spreadsheet can change epoch seconds to dates using =unix2date()
#           OpenOffice.org Calc can import the data as csv and use tabs as separators
#                          xfig use is possible
#                   ImageMagick use is possible
#                        rlplot looks possible
#                         xplot looks possible
#
# History: originally a script for playing music, marking wake and sleep times

Usage: habit {action name|action number|--help}"
       habit (without options is interactive using iselect)"

Input files: ~/.habit.conf
             ~/.habit.log
             ~/.habit.{your action names}
Output file: ~/.habit.png

# hot keys are easy to implement outside the script with numeric or action name parameter

The data file format used by this script is identical to the format used by the
Android app we've created.

    # #action_name\t
    #  epoch_seconds\t
    #  hour_of_day\t
    #  user_input\t
    #  interval_hours\t
    #  readable_date\t
    #  location

Some of these values are redundant or can be calculated, however we have
recorded them here for ease of use. Some of the fields are for compatibility or
future use.

    action_name is just that.

    epoch_seconds is the time when you marked or recorded the action.

    hour_of_day is a simple calculation for charting.

    user_input is not currently used but is present to record any data you
    would like when marking an action.

    interval_hours gives the difference in time between the last marked action.

    readable_date is a human readable date and time string.

    location records gps coordinates on the activehabits.com Android app.

All action times are recorded as unix epoch seconds, or the number of seconds
since Jan 1, 1970, UTC. This allows relatievely simple arithmetic calculations
regardless of time zone. We use programs named "dc" as a calculator and "date"
to convert epoch seconds to something more familiar to us. Right now there is
no UI for editing values but you may do so by editing the .habit.log file
yourself. The following commands perform the key calculations used in the habit
script. Simply, knowing that 60 seconds are in a minute, 60 minutes (3600
seconds) are in an hour and 24 hours (86400 seconds) are in a day many things
can be calculated.

In the habit script, $SECONDS is the output of `date +%s` - the present time in
epoch seconds. In the example below 946684800 represents Dec 31, 1999 at 4 PM
PST though you should the variables as needed for your own calculations

# use this to give the seconds of any --date (replace string):
#
# 	date --date="Jun 28 19:38:15 PDT 2003" +%s

# use this to convert epoch seconds back using local time zone (replace 946684800):
#
# 	date -d '1970-01-01 UTC 946684800 seconds' +"%Y-%m-%d T %T%z"

Knowing how to convert to and from epoch seconds allows calculations between
two arbitrary times.

# use dc to give the difference between two second values (replace variables):
#
# 	dc -e " 2 k $SECONDS $LASTSECONDS - 3600 / n"

To create our graphs, we chart time against time. Horizontal values are the
date and time an action takes place with reasonable human readable lables.

To create vertical values for our graphs we want to know the decimal hours
difference between the beginning of the day today and right now, the hour of
the day. This gives vertical values for our chart.

# use this to create an hour of day value
#
#       dc -e " 2 k `date +\"%M\"` 60 / n "

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Script for keeping a record of marked actions.

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