How to get rid of the `fill_char`s in the foldtext before the `content`

[tummetott]

Hello there,

Let's assume the following code snippet:

When i fold the function, the code looks like this

I would like to get rid of the red circled fill_chars

As far as I can tell, the way to go about this is by configuring fill_char = ' ' within the pretty-folds setup() function and then creating a right-side section which also generates the dots in between. Something like this:

local fold_text = function()
    local lines = vim.v.foldend - vim.v.foldstart + 1
    local padding = has_scrollbar() and ' ' or ''
    local n = vim.api.nvim_win_get_width(0)
         - vim.fn.strdisplaywidth(lines)
         - vim.fn.strdisplaywidth(padding)
         - vim.fn.strdiplaywidth(content) -- How do i get content???
         + 8) -- plus 8 because I have 8 fixed characters in my final string
    local fill_chars = string.rep('⋅', n)
    return string.format('%s %d LINES %s', fill_chars, lines, padding)
end

require('pretty-fold').setup {
    sections = {
        left = { 'content' }, -- I want to have the length of this content in my custom function before
        right = { fold_text }, -- use my custom function
    },
    fill_char = ' ',
    add_close_pattern = true,
}

I'm aware I could skip using the content generated by the plugin and grab the text of the first line of the fold using vim.api.nvim_buf_get_lines(...). However, that would mean missing out on the cool substitutions like the close_pattern, etc.

Is there a way to determine the length of the content? Or perhaps a simpler approach to achieve my goal?

Thanks a lot!

[runarsf]

Hi there, An approach that should do what you want is to get the indentation level of the folded line, and prepend that amount of spaces to the content.

{
  keep_indentation = false,
  sections = {
    left = {
      function() return string.rep(' ', vim.fn.indent(vim.v.foldstart)) end, 'content',
    },
  },
}

[tummetott]

@runarsf Thank you so much for providing such a straightforward solution. I can't believe I didn't think of that earlier.

For future reference, I made some alterations to the solution. It appears that the content module adds a whitespace character as a prefix if content is not the first entry in the left dictionary and the keep_indentation flag is set to false. This can result in a misalignment issue, causing the foldtext to be off by one character. See the source code:

https://github.com/anuvyklack/pretty-fold.nvim/blob/a7d8b424abe0eedf50116c460fbe6dfd5783b1d5/lua/pretty-fold/components.lua#L343-L356

So I strip away the leading whitespace like this:

{
    keep_indentation = false,
    sections = {
        left = {
            function(config)
                local prefix = ''
                local indent = vim.fn.indent(vim.v.foldstart)
                if indent and indent > 0 then
                    prefix = string.rep(' ', indent)
                end
                local content = require('pretty-fold.components')['content'](config)
                -- Cut the leading whitespace
                content = content:gsub('^%s*', '')
                return prefix .. content
            end,
        },
    },
}