consolidated colors

lua/lush_theme/darcula_lush/cterm.lua

@@ -0,0 +1,168 @@
+local M = {}
+
+-- These anchors describe the role of each ANSI color in darcula_lush. They
+-- intentionally use only the 16-color palette so the fallback also works on
+-- a Linux console and other terminals without 256-color support.
+local ansi_anchors = {
+  {index = 0, rgb = 0x101017}, -- black: editor surfaces
+  {index = 1, rgb = 0x3a1e1e}, -- dark red: error/diff surfaces
+  {index = 2, rgb = 0x1e3a1e}, -- dark green: added/success surfaces
+  {index = 3, rgb = 0x4d3d22}, -- dark yellow: changed surfaces
+  {index = 4, rgb = 0x344074}, -- dark blue: mode surfaces
+  {index = 7, rgb = 0xb0abac}, -- light gray: normal text
+  {index = 8, rgb = 0x5f595a}, -- dark gray: muted text/selections
+  {index = 9, rgb = 0xc96b68}, -- bright red: errors
+  {index = 10, rgb = 0x6a906a}, -- bright green: strings
+  {index = 11, rgb = 0xc18a53}, -- bright yellow: keywords/functions
+  {index = 12, rgb = 0x727faf}, -- bright blue: numbers/search
+  {index = 13, rgb = 0x927b9e}, -- bright magenta: constants
+  {index = 14, rgb = 0x009999}, -- bright cyan: cyan accents
+  {index = 15, rgb = 0xc4c0c1} -- white: emphasized text
+}
+
+-- Keep the current palette's deliberately muted colors from drifting to a
+-- similarly close hue (comments becoming green, for example). The nearest
+-- anchor remains a useful fallback when the RGB palette grows.
+local color_overrides = {
+  ["#004ead"] = 12,
+  ["#009999"] = 14,
+  ["#0a0a0f"] = 0,
+  ["#111118"] = 0,
+  ["#1d1b1c"] = 8,
+  ["#1e3a1e"] = 2,
+  ["#20202c"] = 0,
+  ["#212130"] = 0,
+  ["#242433"] = 0,
+  ["#282839"] = 8,
+  ["#2e2e1e"] = 3,
+  ["#2e2e42"] = 8,
+  ["#344074"] = 4,
+  ["#364936"] = 2,
+  ["#3a1e1e"] = 1,
+  ["#3f3f5a"] = 8,
+  ["#434360"] = 8,
+  ["#445397"] = 4,
+  ["#474344"] = 8,
+  ["#4d4d6f"] = 8,
+  ["#506d50"] = 2,
+  ["#5c5758"] = 8,
+  ["#4a2020"] = 1,
+  ["#4d3d22"] = 3,
+  ["#5f595a"] = 8,
+  ["#727faf"] = 12,
+  ["#6a906a"] = 10,
+  ["#766f71"] = 8,
+  ["#952d2d"] = 1,
+  ["#958e8f"] = 7,
+  ["#927b9e"] = 13,
+  ["#9a8065"] = 11,
+  ["#9c9697"] = 7,
+  ["#a19b9c"] = 7,
+  ["#ababab"] = 7,
+  ["#b0abac"] = 7,
+  ["#b5a15a"] = 11,
+  ["#b47a41"] = 11,
+  ["#bab5b6"] = 15,
+  ["#bfbbbc"] = 15,
+  ["#c18a53"] = 11,
+  ["#c4c0c1"] = 15,
+  ["#cc9e71"] = 11,
+  ["#c96b68"] = 9,
+  ["#ffffff"] = 15
+}
+
+local group_overrides = {
+  CocMenuSel = {ctermfg = 0, ctermbg = 7},
+  ColorColumn = {ctermbg = 8},
+  CursorColumn = {ctermfg = 7, ctermbg = 8},
+  CursorLine = {ctermbg = 8},
+  DiffAdd = {ctermfg = 15, ctermbg = 2},
+  DiffChange = {ctermfg = 15, ctermbg = 3},
+  DiffDelete = {ctermfg = 15, ctermbg = 1},
+  DiffText = {ctermfg = 0, ctermbg = 3},
+  Error = {ctermfg = 15, ctermbg = 1},
+  Folded = {ctermfg = 7, ctermbg = 8},
+  PmenuSel = {ctermfg = 0, ctermbg = 7},
+  QuickFixLine = {ctermfg = 0, ctermbg = 7},
+  StatusLine = {ctermfg = 0, ctermbg = 7},
+  StatusLineNC = {ctermfg = 7, ctermbg = 8},
+  TabLine = {ctermfg = 7, ctermbg = 8},
+  TabLineSel = {ctermfg = 0, ctermbg = 7},
+  Visual = {ctermfg = 0, ctermbg = 7}
+}
+
+local function channels(rgb)
+  return math.floor(rgb / 0x10000) % 0x100,
+    math.floor(rgb / 0x100) % 0x100,
+    rgb % 0x100
+end
+
+local function nearest_ansi(color)
+  local rgb
+  if type(color) == "number" then
+    rgb = color
+    local override = color_overrides[string.format("#%06x", rgb)]
+    if override then
+      return override
+    end
+  elseif type(color) ~= "string" then
+    return nil
+  else
+    local hex = color:match("^#(%x%x%x%x%x%x)$")
+    if not hex then
+      return nil
+    end
+    local override = color_overrides["#" .. hex:lower()]
+    if override then
+      return override
+    end
+    rgb = tonumber(hex, 16)
+  end
+
+  local red, green, blue = channels(rgb)
+  local nearest
+  local nearest_distance
+
+  for _, anchor in ipairs(ansi_anchors) do
+    local anchor_red, anchor_green, anchor_blue = channels(anchor.rgb)
+    local distance = (red - anchor_red) ^ 2
+      + (green - anchor_green) ^ 2
+      + (blue - anchor_blue) ^ 2
+
+    if not nearest_distance or distance < nearest_distance then
+      nearest = anchor.index
+      nearest_distance = distance
+    end
+  end
+
+  return nearest
+end
+
+function M.apply(theme)
+  local compiled = require("lush").compile(theme)
+
+  for group, attrs in pairs(compiled) do
+    if not attrs.link then
+      attrs.ctermfg = nearest_ansi(attrs.fg)
+      attrs.ctermbg = nearest_ansi(attrs.bg)
+
+      for key, value in pairs(group_overrides[group] or {}) do
+        attrs[key] = value
+      end
+
+      vim.api.nvim_set_hl(0, group, attrs)
+    end
+  end
+end
+
+function M.apply_matching(pattern)
+  for group, attrs in pairs(vim.api.nvim_get_hl(0, {})) do
+    if group:match(pattern) and not attrs.link then
+      attrs.ctermfg = nearest_ansi(attrs.fg)
+      attrs.ctermbg = nearest_ansi(attrs.bg)
+      vim.api.nvim_set_hl(0, group, attrs)
+    end
+  end
+end
+
+return M