Seoul256 own custom vim Airline theme (vim/autoload/airline/themes/seoul256.vim)

seoul256.vim

let g:airline#themes#seoul256#palette = {}

function! airline#themes#seoul256#refresh()

	let M0 = airline#themes#get_highlight('Special')
	let accents_group = airline#themes#get_highlight('Special')
	let modified_group = [M0[0], '', M0[2], '', '']
	let warning_group = airline#themes#get_highlight2(['airline_warning', 'bg'], ['airline_warning', 'fg'])

	let s:N1 = airline#themes#get_highlight2(['Normal', 'bg'], ['StatusLine', 'fg'])
	let s:N2 = airline#themes#get_highlight2(['StatusLineNC', 'bg'], ['StatusLineNC', 'fg'])
	let s:N3 = airline#themes#get_highlight2(['StatusLineNC', 'bg'], ['CursorLine', 'bg'])
	let g:airline#themes#seoul256#palette.normal = airline#themes#generate_color_map(s:N1, s:N2, s:N3)
	let g:airline#themes#seoul256#palette.normal_modified = { 'airline_c': modified_group }
	let g:airline#themes#seoul256#palette.normal.airline_warning = warning_group
	let g:airline#themes#seoul256#palette.normal_modified.airline_warning = warning_group

	let s:I1 = airline#themes#get_highlight2(['Normal', 'bg'], ['TabLineSel', 'bg'])
	let s:I2 = s:N2
	let s:I3 = airline#themes#get_highlight2(['Normal', 'fg'], ['StatusLineNC', 'fg'])
	let g:airline#themes#seoul256#palette.insert = airline#themes#generate_color_map(s:I1, s:I2, s:I3)
	let g:airline#themes#seoul256#palette.insert_modified = g:airline#themes#seoul256#palette.normal_modified
	let g:airline#themes#seoul256#palette.insert.airline_warning = g:airline#themes#seoul256#palette.normal.airline_warning
	let g:airline#themes#seoul256#palette.insert_modified.airline_warning = g:airline#themes#seoul256#palette.normal_modified.airline_warning

	let s:R1 = airline#themes#get_highlight2(['Normal', 'bg'], ['Structure', 'fg'])
	let s:R2 = s:I2
	let s:R3 = s:I3
	let g:airline#themes#seoul256#palette.replace = airline#themes#generate_color_map(s:R1, s:R2, s:R3)
	let g:airline#themes#seoul256#palette.replace_modified = g:airline#themes#seoul256#palette.normal_modified
	let g:airline#themes#seoul256#palette.replace.airline_warning = g:airline#themes#seoul256#palette.normal.airline_warning
	let g:airline#themes#seoul256#palette.replace_modified.airline_warning = g:airline#themes#seoul256#palette.normal_modified.airline_warning

	let s:V1 = airline#themes#get_highlight2(['Normal', 'bg'], ['ErrorMsg', 'bg'])
	let s:V2 = s:N2
	let s:V3 = airline#themes#get_highlight2(['Normal', 'bg'], ['TabLine', 'fg'])
	let g:airline#themes#seoul256#palette.visual = airline#themes#generate_color_map(s:V1, s:V2, s:V3)
	let g:airline#themes#seoul256#palette.visual_modified = { 'airline_c': [ s:V3[0], '', s:V3[2], '', '' ] }
	let g:airline#themes#seoul256#palette.visual.airline_warning = g:airline#themes#seoul256#palette.normal.airline_warning
	let g:airline#themes#seoul256#palette.visual_modified.airline_warning = g:airline#themes#seoul256#palette.normal_modified.airline_warning

	let s:IA = airline#themes#get_highlight2(['TabLine', 'fg'], ['CursorLine', 'bg'])
	let g:airline#themes#seoul256#palette.inactive = airline#themes#generate_color_map(s:IA, s:IA, s:IA)
	let g:airline#themes#seoul256#palette.inactive_modified = { 'airline_c': modified_group }

	let g:airline#themes#seoul256#palette.accents = { 'red': accents_group }

	let s:TF = airline#themes#get_highlight2(['Normal', 'bg'], ['Normal', 'bg'])
	let g:airline#themes#seoul256#palette.tabline = {
		\ 'airline_tab':  s:N2,
		\ 'airline_tabsel':  s:N1,
		\ 'airline_tabtype':  s:V1,
		\ 'airline_tabfill':  s:TF,
		\ 'airline_tabhid':  s:IA,
		\ 'airline_tabmod':  s:I1
		\ }
endfunction

call airline#themes#seoul256#refresh()