i3 FAQ - Individual question feed

i3bar updated only after `status_command` process exits

Tue, 15 Apr 2014 11:49:19 +0000

Hello, I am using the following ruby script to parse the status output by conky and produce a json string: #!/usr/bin/ruby require 'json' puts '{"version":1}' puts '[' puts '[],' IO.popen("conky -c $HOME/.conkyrc_json").each do |line| conky = JSON.parse(line) out = "[" out << "{\"full_text\": \"#{conky['network']}\", \"color\": \"\#FFFFFF\"}," out << "]," puts out end If I simply run this script, i3bar doesn't render any text, it just shows tray icons. However, if in the end of the loop I add a `exit` statement, i3bar shows the text produced in the last loop, but since the ruby wrapper then exits, the text in i3bar is never updated. Do I need to send an extra signal to i3bar? How can I force i3bar to update without exiting my wrapper script? Thank you

Comment by Adaephon for

Hello,

I am using the following ruby script to parse the status output by conky and produce a json string:

#!/usr/bin/ruby
require 'json'

puts '{"version":1}'

puts '['

puts '[],'

IO.popen("conky -c $HOME/.conkyrc_json").each do |line|
  conky = JSON.parse(line)

  out = "["

  out << "{\"full_text\": \"#{conky['network']}\", \"color\": \"\#FFFFFF\"},"

  out << "],"

  puts out
end

If I simply run this script, i3bar doesn't render any text, it just shows tray icons.

However, if in the end of the loop I add a exit statement, i3bar shows the text produced in the last loop, but since the ruby wrapper then exits, the text in i3bar is never updated.

Do I need to send an extra signal to i3bar? How can I force i3bar to update without exiting my wrapper script?

Thank you

Tue, 15 Apr 2014 13:17:29 +0000

I'm not sure how it is done in ruby, but you may need to either explicitly flush stdout after `puts` or switch on line-based buffering. Otherwise the output of your command will only be passed to i3bar once the output buffer (usually around 8kb) is full.

Answer by badboy_ for

Hello,

I am using the following ruby script to parse the status output by conky and produce a json string:

#!/usr/bin/ruby
require 'json'

puts '{"version":1}'

puts '['

puts '[],'

IO.popen("conky -c $HOME/.conkyrc_json").each do |line|
  conky = JSON.parse(line)

  out = "["

  out << "{\"full_text\": \"#{conky['network']}\", \"color\": \"\#FFFFFF\"},"

  out << "],"

  puts out
end

If I simply run this script, i3bar doesn't render any text, it just shows tray icons.

However, if in the end of the loop I add a exit statement, i3bar shows the text produced in the last loop, but since the ruby wrapper then exits, the text in i3bar is never updated.

Do I need to send an extra signal to i3bar? How can I force i3bar to update without exiting my wrapper script?

Thank you

Tue, 15 Apr 2014 17:18:53 +0000

Try `$stdout.flush` to flush the output (as Adaephon said in the comment already)

Comment by simao for
Try `$stdout.flush` to flush the output (as Adaephon said in the comment already)

Wed, 16 Apr 2014 13:42:18 +0000

I was doing something wrong before, I tried this again and it works. Thanks

Comment by simao for
Try `$stdout.flush` to flush the output (as Adaephon said in the comment already)

Wed, 16 Apr 2014 08:33:53 +0000

Yeah I tried that but still nothing changes..

i3 FAQ - Individual question feed

i3bar updated only after `status_command` process exits

Comment by simao for Try $stdout.flush to flush the output (as Adaephon said in the comment already)

Comment by simao for Try $stdout.flush to flush the output (as Adaephon said in the comment already)

Comment by simao for
Try `$stdout.flush` to flush the output (as Adaephon said in the comment already)

Comment by simao for
Try `$stdout.flush` to flush the output (as Adaephon said in the comment already)