barrett/diffs.nvim
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fix(highlight): use hl_group instead of line_hl_group for diff backgrounds

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line_hl_group bg occupies a separate rendering channel from hl_group in
Neovim's extmark system, causing character-level bg-only highlights to be
invisible regardless of priority. Switching to hl_group + hl_eol ensures
all backgrounds compete in the same channel.

Also reorders priorities (Normal 198 < line bg 199 < syntax 200 < char
bg 201), bumps char-level blend alpha from 0.4 to 0.7 for visibility,
and adds debug logging throughout the intra pipeline.
This commit is contained in:
Barrett Ruth 2026-02-06 18:28:22 -05:00
parent f1c13966ba
commit cc947167c3
5 changed files with 427 additions and 20 deletions
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13
lua/diffs/init.lua
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@ -183,8 +183,8 @@ local function compute_highlight_groups()
local blended_add = blend_color(add_bg, bg, 0.4)
local blended_del = blend_color(del_bg, bg, 0.4)
local blended_add_text = blend_color(add_fg, bg, 0.4)
local blended_del_text = blend_color(del_fg, bg, 0.4)
local blended_add_text = blend_color(add_fg, bg, 0.7)
local blended_del_text = blend_color(del_fg, bg, 0.7)
vim.api.nvim_set_hl(0, 'DiffsAdd', { default = true, bg = blended_add })
vim.api.nvim_set_hl(0, 'DiffsDelete', { default = true, bg = blended_del })
@ -193,6 +193,15 @@ local function compute_highlight_groups()
vim.api.nvim_set_hl(0, 'DiffsAddText', { default = true, bg = blended_add_text })
vim.api.nvim_set_hl(0, 'DiffsDeleteText', { default = true, bg = blended_del_text })
dbg('highlight groups: Normal.bg=#%06x DiffAdd.bg=#%06x diffAdded.fg=#%06x', bg, add_bg, add_fg)
dbg(
'DiffsAdd.bg=#%06x DiffsAddText.bg=#%06x DiffsAddNr.fg=#%06x',
blended_add,
blended_add_text,
add_fg
)
dbg('DiffsDelete.bg=#%06x DiffsDeleteText.bg=#%06x', blended_del, blended_del_text)
local diff_change = resolve_hl('DiffChange')
local diff_text = resolve_hl('DiffText')