Hi,
I'm the developer of Powerline, and I've recently stumbled upon an issue which
makes it hard to implement some kinds of functionality for statuslines. Here's
a description of the issue:
In the development version of Powerline I would like to be able to generate the
entire statusline in an external function (i.e. the filename, encoding,
fugitive branch, etc.). I'm currently using the %!...() statusline item which
allows the statusline to be generated in a function.
The problem with this is that anything evaluated in this function is evaluated
in the *currently selected buffer*, instead of the buffer/window that the
statusline actually belongs to. The side effect of this is that the statuslines
for all the windows get the information for the current window (i.e. if you
have a split window all statuslines will contain information from the currently
selected window).
It is possible to evaluate functions in the buffer/window that the statusline
belongs to with %{...} statusline items, but these items take forever being
evaluated if they contain Python code, and they don't allow colors or other
options being returned from the external function. It is also possible using
vim's statusline items (like %f, %h, etc.) but since the statusline is
generated externally in order to trim away information if the statusline gets
too long this doesn't work in my case.
A solution to this problem could be to run the external function like this
(pseudo-code): setl stl=%!Powerline(winnr(0))
By passing the window number to the statusline function for each window, it is
possible to get window-local information like the fileencoding and stuff using
getwinvar() in the external function. But I haven't been able to find a
solution that works for functions. So my question is: Is there any way of
executing a function in the context of a specific window or buffer, like
callbuffunction(<bufnr>, myfunction)?
If not, do you guys have any suggestions to how I could circumvent this
limitation and generate window-specific statuslines using the %!...()
statusline item?
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