[FEATURE] Add support for sass variables

Import support

import using use and import keyword

multiple imports in single line

multiple imports in multiple lines ( using commas )

recursive imports

watch imports for changes and automatically rehighlight buffer

buffer variables

recursive variables support

multiple variables in single line

parse imported files only when they are changed

Loosely based on https://github.com/norcalli/nvim-colorizer.lua/pull/22/files

1 files changed, 66 insertions, 0 deletions

diff --git a/lua/colorizer/utils.lua b/lua/colorizer/utils.lua
index bfffb60..9dad9d8 100644
--- a/lua/colorizer/utils.lua
+++ b/lua/colorizer/utils.lua
@@ -3,6 +3,8 @@
 local bit, ffi = require "bit", require "ffi"
 local band, bor, rshift, lshift = bit.band, bit.bor, bit.rshift, bit.lshift
 
+local uv = vim.loop
+
 -- -- TODO use rgb as the return value from the matcher functions
 -- -- instead of the rgb_hex. Can be the highlight key as well
 -- -- when you shift it left 8 bits. Use the lower 8 bits for
@@ -101,6 +103,68 @@ local function percent_or_hex(v)
   return x
 end
 
+--- Get last modified time of a file
+---@param path string: file path
+---@return number|nil: modified time
+local function get_last_modified(path)
+  local fd = uv.fs_open(path, "r", 438)
+  if not fd then
+    return
+  end
+
+  local stat = uv.fs_fstat(fd)
+  uv.fs_close(fd)
+  if stat then
+    return stat.mtime.nsec
+  else
+    return
+  end
+end
+
+--- Watch a file for changes and execute callback
+---@param path string: File path
+---@param callback function: Callback to execute
+---@param ... array: params for callback
+---@return function|nil
+local function watch_file(path, callback, ...)
+  if not path or type(callback) ~= "function" then
+    return
+  end
+
+  local fullpath = uv.fs_realpath(path)
+  if not fullpath then
+    return
+  end
+
+  local start
+  local args = { ... }
+
+  local handle = uv.new_fs_event()
+  local function on_change(err, filename, _)
+    -- Do work...
+    callback(filename, unpack(args))
+    -- Debounce: stop/start.
+    handle:stop()
+    if not err or not get_last_modified(filename) then
+      start()
+    end
+  end
+
+  function start()
+    uv.fs_event_start(
+      handle,
+      fullpath,
+      {},
+      vim.schedule_wrap(function(...)
+        on_change(...)
+      end)
+    )
+  end
+
+  start()
+  return handle
+end
+
 --- @export
 return {
   byte_is_alphanumeric = byte_is_alphanumeric,
@@ -108,4 +172,6 @@ return {
   merge = merge,
   parse_hex = parse_hex,
   percent_or_hex = percent_or_hex,
+  get_last_modified = get_last_modified,
+  watch_file = watch_file,
 }