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-- Extra functionality for displaying Vim help.
local M = {}
--- Apply current colorscheme to lists of default highlight groups
---
--- Note: {patterns} is assumed to be sorted by occurrence in the file.
--- @param patterns {start:string,stop:string,match:string}[]
function M.highlight_groups(patterns)
local ns = vim.api.nvim_create_namespace('vimhelp')
vim.api.nvim_buf_clear_namespace(0, ns, 0, -1)
local save_cursor = vim.fn.getcurpos()
for _, pat in pairs(patterns) do
local start_lnum = vim.fn.search(pat.start, 'c')
local end_lnum = vim.fn.search(pat.stop)
if start_lnum == 0 or end_lnum == 0 then
break
end
for lnum = start_lnum, end_lnum do
local word = vim.api.nvim_buf_get_lines(0, lnum - 1, lnum, true)[1]:match(pat.match)
if vim.fn.hlexists(word) ~= 0 then
vim.api.nvim_buf_set_extmark(0, ns, lnum - 1, 0, { end_col = #word, hl_group = word })
end
end
end
vim.fn.setpos('.', save_cursor)
end
return M
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