nvim/norcalli.nvim-colorizer.lua
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Refactor and cleanup.

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This commit is contained in:
Ashkan Kiani 2019-10-17 19:31:17 -07:00
parent 7bb80eb499
commit 7fefb96644
1 changed files with 3 additions and 42 deletions
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45
lua/colorizer.lua
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@ -24,24 +24,6 @@ local function initialize_trie()
end
end
local b_a = string.byte('a')
local b_z = string.byte('z')
local b_A = string.byte('A')
local b_Z = string.byte('Z')
local b_0 = string.byte('0')
local b_9 = string.byte('9')
local b_f = string.byte('f')
local b_hash = string.byte('#')
local bnot = bit.bnot
local band, bor, bxor = bit.band, bit.bor, bit.bxor
local lshift, rshift, rol = bit.lshift, bit.rshift, bit.rol
-- TODO use lookup table?
local function byte_is_hex(byte)
byte = bor(byte, 0x20)
return (byte >= b_0 and byte <= b_9) or (byte >= b_a and byte <= b_f)
end
--- Determine whether to use black or white text
-- Ref: https://stackoverflow.com/a/1855903/837964
-- https://stackoverflow.com/questions/596216/formula-to-determine-brightness-of-rgb-color
@ -66,19 +48,14 @@ local function make_highlight_name(rgb, mode)
return table.concat({HIGHLIGHT_NAME_PREFIX, MODE_NAMES[mode], rgb}, '_')
end
local highlight_cache = {}
-- Ref: https://stackoverflow.com/questions/1252539/most-efficient-way-to-determine-if-a-lua-table-is-empty-contains-no-entries
local function table_is_empty(t)
return next(t) == nil
end
local HIGHLIGHT_CACHE = {}
local function create_highlight(rgb_hex, options)
local mode = options.mode or 'background'
-- TODO validate rgb format?
rgb_hex = rgb_hex:lower()
local cache_key = table.concat({MODE_NAMES[mode], rgb_hex}, "_")
local highlight_name = highlight_cache[cache_key]
local highlight_name = HIGHLIGHT_CACHE[cache_key]
-- Look up in our cache.
if not highlight_name then
if #rgb_hex == 3 then
@ -103,27 +80,11 @@ local function create_highlight(rgb_hex, options)
end
nvim.ex.highlight(highlight_name, "guifg="..fg_color, "guibg=#"..rgb_hex)
end
highlight_cache[cache_key] = highlight_name
HIGHLIGHT_CACHE[cache_key] = highlight_name
end
return highlight_name
end
--- Highlight a region in a buffer from the attributes specified
local function highlight_region(buf, ns, highlight_name,
region_line_start, region_byte_start,
region_line_end, region_byte_end)
-- TODO should I bother with highlighting normal regions?
if region_line_start == region_line_end then
nvim.buf_add_highlight(buf, ns, highlight_name, region_line_start, region_byte_start, region_byte_end)
else
nvim.buf_add_highlight(buf, ns, highlight_name, region_line_start, region_byte_start, -1)
for linenum = region_line_start + 1, region_line_end - 1 do
nvim.buf_add_highlight(buf, ns, highlight_name, linenum, 0, -1)
end
nvim.buf_add_highlight(buf, ns, highlight_name, region_line_end, 0, region_byte_end)
end
end
--[[-- Highlight the buffer region.
Highlight starting from `line_start` (0-indexed) for each line described by `lines` in the
buffer `buf` and attach it to the namespace `ns`.