[BUG] Help output is printed slowly

[onox]

Describe the bug
The output printed by help is printed quite slowly.

To Reproduce
Steps to reproduce the behavior:

1. Go to the prompt
2. Type 'help' and press the enter key
3. It takes like 1 or 2 seconds to print everything

Expected behavior (if applicable)
See the help text getting printed more or less instantly

Desktop (please complete the following information):

• OS: Arch Linux
• Version: Built from Source

Additional context
Minor issue.

[pyjarrett]

Might be a regression of #35, I think it might be buffering due to not using a back buffer and the current Trendy Terminal newline settings instead of scrolling. Last time IIRC it was related to a long delay due to VT100.Report_Cursor_Position procedure.

[onox]

Using https://github.com/onox/goblin-terminal (it uses VTE like gnome-terminal). But output is printed instant in tmux! 😮

[pyjarrett]

Yup, if you use strace to check the length of the system calls you might see an issue. htop has an easy way of doing this.

[onox]

For each line printed, I see:

• read()
• read() returning E_AGAIN
• write()
• 4x poll()
• write()
• clock_nanosleep()
• 2x poll()
• write()

With weston-terminal the output is printed instantly and I see:

• epoll_wait()
• read()
• write()

[onox]

Slow in gnome-terminal as well (not a surprise since it uses VTE)

[pyjarrett]

Thanks! I'll look when I can, but it might be a couple of days before I get to this.