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Allow launched program to easily sync scroll position #3593

salmankhilji opened this issue May 8, 2021 · 1 comment

Allow launched program to easily sync scroll position #3593

salmankhilji opened this issue May 8, 2021 · 1 comment


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The launch mechanism does not have the equivalent of INPUT_LINE_NUMBER as scrollback_pager does.

I am feeding the contents of the current screen and scrollback to vim like this:

map f12 launch --type=overlay --stdin-source=@screen_scrollback vimw -

Where vimw is my wrapper script that execs vim.

I want to have my wrapper script scroll vim to the exact position as the scroll position within the kitty window.

The equation to compute input_line_number is:

input_line_number = (lines - (self.screen.lines - 1) - self.screen.scrolled_by)

As we can see, we need total number of lines, which kitty does not include in KITTY_PIPE_DATA.

Work Around:

I could try to compute total number of lines using wc -l within my script. However, doing so requires that I first store the entire stdin into a variable (because wc -l would consume stdin and I need stdin later to feed to vim.)

Possible Solutions:

  1. Include total number of lines in KITTY_PIPE_DATA.

  2. Add a new special argument named @input_line_number or @total_line_count (like @selection).

    The first one is preferred as the latter would still need bit of math and may force the need to write a wrapper script for folks who want it all inline within the kitty.conf file.


I am reluctant to use scrollback_pager mechanism as none of the examples mentioned in this thread implement the scrolling part. Moreover, vim's +LINE command-line argument does not seem to work when we use the term command to load stdin (as the current solutions do).

@salmankhilji salmankhilji changed the title Allow launched program easily sync scroll position Allow launched program to easily sync scroll position May 8, 2021
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Never mind. I figured it all out only to end with a disappointment where vim seems to have a bug that prevents it from correctly loading large buffers using the term command. Nevertheless, if you think someone else could use this feature, go right ahead.

kovidgoyal added a commit that referenced this issue May 9, 2021
Now all ``KITTY_PIPE_DATA`` is also available via command line argument substitution
Fixes #3593
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