xordspar0/f-trigger

Trigger events based on a frequency on stdin

𝑓-trigger

Trigger events based on a frequency on stdin

Examples

cycling_cadence.py | f-trigger \
    0 "play break_song.ogg" \
    1-80 "play easy_song.ogg" \
    81- "play pumping_song.ogg"

tail -f /var/log/mybot.log | f-trigger \
    -10 "echo 'Low activity. Notifying administrator.'; email_admin.sh"

tail -f /var/log/apache2/error.log | f-trigger 10000- "play alert.ogg"

f-trigger's Issues

Split off a `bpm` command

f-trigger should be more generic. It should trigger based on streams of numbers coming from stdin. Instead of calculating the frequency of input, there should be a companion command called bpm that converts stdin to a bpm value. f-trigger will then use that number to trigger its events. The syntax of f-trigger commands need not change.

Example:

tail -f /var/log/apache2/errors.log | bpm | f-trigger 10000- "play alert.ogg"

f-trigger will now take a stream of numbers as input. This allows us to more easily add some features. Ideas:

• store recent values and calculate moving averages
• optionally ignore large, sudden spikes
• set a default value for when there is no input

Add a visual output mode

With the -v flag, output will look something like this:

program.sh | f-trigger -v 0 "do_something.sh" 1-20 "another_thing.sh" 20-40 "one_more_thing.sh"
11      => 0       1-20    20-40

 ^                 ^
Current            Since this is the current action,
 input              highlight it with reverse video.