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refactor: Improve section separators 

- behaviour change now statusline won't be separated with %=
  if you don't have at lest one of lualine_x/y/z
- fixed some bugs
- simplified the transitional separators quite a bit. I think now
  it's understandable . Yay .
- Perf improvements too.
This commit is contained in:
shadmansaleh 2021-08-25 17:43:12 +06:00 committed by Shadman
parent fa1f001207
commit 1c57497863
3 changed files with 84 additions and 143 deletions
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58
lua/lualine/highlight.lua
View File

@ -225,58 +225,24 @@ function M.format_highlight(is_focused, highlight_group)
end
-- @description : Provides transitional highlights for section separators.
-- @param left_section_data :(string) section before separator
-- @param right_section_data:(string) section after separator
-- @param reverse :(string) Whether it's a left separator or right separator
-- '▶️' and '◀️' needs reverse colors so this parameter needs to be set true.
-- @param left_hl :(string) this highlights bg is used for fg of transitional hl
-- @param right_hl:(string) this highlights bg is used for bg of transitional hl
-- '▶️' and '◀️' ' eeds reverse colors so the caller should swap left and right
-- @return: (string) formated highlight group name
function M.get_transitional_highlights(left_section_data, right_section_data,
reverse)
local left_highlight_name, right_highlight_name
-- Grab the last highlighter of left section
if left_section_data then
-- extract highlight_name from .....%#highlight_name#
left_highlight_name = left_section_data:match('.*%%#(.-)#.-')
else
-- When right section us unavailable default to lualine_c
left_highlight_name = append_mode('lualine_c')
if not utils.highlight_exists(left_highlight_name) then
left_highlight_name = 'lualine_c_normal'
end
end
if right_section_data then
-- extract highlight_name from %#highlight_name#....
right_highlight_name = right_section_data:match('.-%%#(.-)#.*')
else
-- When right section us unavailable default to lualine_c
right_highlight_name = append_mode('lualine_c')
if not utils.highlight_exists(right_highlight_name) then
right_highlight_name = 'lualine_c_normal'
end
end
-- When both left and right highlights are same nothing to transition to
if left_highlight_name == right_highlight_name then return end
function M.get_transitional_highlights(left_hl, right_hl)
-- When both left and right highlights are same or one is absent
-- nothing to transition to.
if left_hl == nil or right_hl == nil or left_hl == right_hl then return nil end
-- construct the name of hightlight group
local highlight_name
if left_highlight_name:find('lualine_') == 1 then
highlight_name = left_highlight_name .. '_to_' .. right_highlight_name
else
highlight_name = 'lualine_' .. left_highlight_name .. '_to_' ..
right_highlight_name
end
local highlight_name = table.concat({'lualine_transitional',left_hl,'to',right_hl}, '_')
if not utils.highlight_exists(highlight_name) then
-- Create the highlight_group if needed
-- Get colors from highlights
-- using string.format to convert decimal to hexadecimal
local fg = utils.extract_highlight_colors(left_highlight_name, 'bg')
local bg = utils.extract_highlight_colors(right_highlight_name, 'bg')
-- swap the bg and fg when reverse is true. As in that case highlight will
-- be placed before section
if reverse then fg, bg = bg, fg end
if not fg or not bg then return '' end -- Color retrieval failed
if bg == fg then return '' end -- Separatoe won't be visible anyway
local fg = utils.extract_highlight_colors(left_hl, 'bg')
local bg = utils.extract_highlight_colors(right_hl, 'bg')
if not fg or not bg then return nil end -- Color retrieval failed
if bg == fg then return nil end -- Separator won't be visible anyway
M.highlight(highlight_name, fg, bg, nil)
end
return '%#' .. highlight_name .. '#'

163
lua/lualine/init.lua
View File

@ -11,86 +11,79 @@ local modules = require('lualine.utils.lazy_require'){
local config -- Stores cureently applied config
local new_config = true -- Stores config that will be applied
local function apply_transitional_separators(previous_section, current_section,
next_section)
local function apply_transitional_separators(status)
local status_applied = {} -- Collects all the pieces for concatation
local last_hl -- Stores lash highligjt group that we found
local copied_pos = 1 -- Tracks how much we've copied over to status_applied
local str_checked = 1 -- Tracks where the searcher head is at
local function fill_section_separator(prev, next, sep, reverse)
if #sep == 0 then return 0 end
local transitional_highlight = modules.highlight.get_transitional_highlights(prev,
next,
reverse)
if transitional_highlight and #transitional_highlight > 0 then
return transitional_highlight .. sep
else
return ''
local function find_next_hl()
-- Gets the next valid hl group from str_checked
local hl_pos_start, hl_pos_end = status:find('%%#.-#', str_checked + 1)
while true do
if not hl_pos_start then return nil end
-- When there are more that one hl group next to one another like
-- %#HL1#%#HL2#%#HL3# we need to return HL3. This makes that happen.
local next_start, next_end = status:find('^%%#.-#', hl_pos_end + 1)
if next_start == nil then break end
hl_pos_start, hl_pos_end = next_start, next_end
end
return status:sub(hl_pos_start + 2, hl_pos_end - 1)
end
local function fill_section_separator(sep, reverse)
-- Inserts transitional separator along with transitional highlight
if last_hl and #last_hl == 0 then return end
local next_hl = find_next_hl()
if next_hl == nil then return end
local transitional_highlight = reverse -- lua ternary assignment x ? y : z
and modules.highlight.get_transitional_highlights(last_hl, next_hl)
or modules.highlight.get_transitional_highlights(next_hl, last_hl)
if transitional_highlight then
table.insert(status_applied, transitional_highlight .. sep)
end
end
-- variable to track separators position
local sep_pos = 1
-- Process entire status replace the %s{sep} & %S{sep} placeholders
-- with proper transitional separator.
while str_checked ~= nil do
str_checked = status:find('%%', str_checked)
if str_checked == nil then break end
table.insert(status_applied, status:sub(copied_pos, str_checked - 1))
-- -1 so we don't copy '%'
copied_pos = str_checked
local next_char = modules.utils.charAt(status, str_checked +1)
if next_char == '#' then
-- %#hl_name# highlights
last_hl = status:match('^%%#(.-)#', str_checked)
str_checked = str_checked + #last_hl + 3
elseif next_char == 's' then
-- %s{sep} is marker for left separator and
-- %S{sep} is marker for right separator
-- Apply left separator
while sep_pos do
-- get what the separator char
local sep = current_section.data:match('%%s{(.-)}', sep_pos)
-- Get where separator starts from
sep_pos = current_section.data:find('%%s{.-}', sep_pos)
if not sep or not sep_pos then break end
-- part of section before separator . -1 since we don't want the %
local prev = current_section.data:sub(1, sep_pos - 1)
-- part of section after separator. 4 is length of "%s{}"
local nxt = current_section.data:sub(sep_pos + 4 + #sep)
-- prev might not exist when separator is the first element of section
-- use previous section as prev
if not prev or #prev == 0 or sep_pos == 1 then
prev = previous_section.data
end
if prev ~= previous_section.data then
-- Since the section isn't suppose to be highlighted with separators
-- separators highlight extract the last highlight and place it between
-- separator and section
local last_hl = prev:match('.*(%%#.-#).-')
current_section.data = prev ..
fill_section_separator(prev, nxt, sep, false) ..
last_hl .. nxt
local sep = status:match('^%%s{(.-)}', str_checked)
str_checked = str_checked + #sep + 4 -- 4 = len(%{})
fill_section_separator(sep, false)
copied_pos = str_checked
elseif next_char == 'S' then
-- %S{sep} is marker for right separator and
local sep = status:match('^%%S{(.-)}', str_checked)
str_checked = str_checked + #sep + 4 -- 4 = len(%{})
fill_section_separator(sep, true)
copied_pos = str_checked
elseif next_char == '%' then
str_checked = str_checked + 2 -- Skip the following % too
else
current_section.data = fill_section_separator(prev, nxt, sep, true) .. nxt
str_checked = str_checked + 1 -- Push it forward to avoid inf loop
end
end
-- Reset pos for right separator
sep_pos = 1
-- Apply right separator
while sep_pos do
local sep = current_section.data:match('%%S{(.-)}', sep_pos)
sep_pos = current_section.data:find('%%S{.-}', sep_pos)
if not sep or not sep_pos then break end
local prev = current_section.data:sub(1, sep_pos - 1)
local nxt = current_section.data:sub(sep_pos + 4 + #sep)
if not nxt or #nxt == 0 or sep_pos == #current_section.data then
nxt = next_section.data
end
if nxt ~= next_section.data then
current_section.data = prev ..
fill_section_separator(prev, nxt, sep, false) ..
nxt
else
current_section.data = prev ..
fill_section_separator(prev, nxt, sep, false)
end
sep_pos = sep_pos + 4 + #sep
end
return current_section.data
table.insert(status_applied, status:sub(copied_pos)) -- Final chunk
return table.concat(status_applied)
end
local function statusline(sections, is_focused)
-- status_builder stores statusline without section_separators
-- The sequence sections should maintain
-- The sequence sections should maintain [SECTION_SEQUENCE]
local section_sequence = {'a', 'b', 'c', 'x', 'y', 'z'}
local status_builder = {}
local status = {}
local applied_midsection_devider = false
for _, section_name in ipairs(section_sequence) do
if sections['lualine_' .. section_name] then
-- insert highlight+components of this section to status_builder
@ -98,38 +91,16 @@ local function statusline(sections, is_focused)
sections['lualine_' .. section_name],
section_name, is_focused)
if #section_data > 0 then
table.insert(status_builder, {name = section_name, data = section_data})
if not applied_midsection_devider and section_name > 'c' then
applied_midsection_devider = true
section_data = '%='..section_data
end
table.insert(status, section_data)
end
end
end
-- Actual statusline
local status = {}
local half_passed = false
for i = 1, #status_builder do
-- midsection divider
if not half_passed and status_builder[i].name > 'c' then
table.insert(status,
modules.highlight.format_highlight(is_focused, 'lualine_c') .. '%=')
half_passed = true
end
-- component separator needs to have fg = current_section.bg
-- and bg = adjacent_section.bg
local previous_section = status_builder[i - 1] or {}
local current_section = status_builder[i]
local next_section = status_builder[i + 1] or {}
local section = apply_transitional_separators(previous_section,
current_section, next_section)
table.insert(status, section)
end
-- incase none of x,y,z was configured lets not fill whole statusline with a,b,c section
if not half_passed then
table.insert(status,
modules.highlight.format_highlight(is_focused, 'lualine_c') .. '%=')
end
return table.concat(status)
return apply_transitional_separators(table.concat(status))
end
-- check if any extension matches the filetype and return proper sections

4
lua/lualine/utils/utils.lua
View File

@ -80,4 +80,8 @@ function M.is_valid_filename(name)
return name:find(invalid_chars) == nil
end
function M.charAt(str, pos)
return string.char(str:byte(pos))
end
return M