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--
-- 50-highlight.lua
--
-- * Creates a function to adjust highlight groups for the solarized colorscheme. It also sets popup
-- menu width and border style.
-- * Creates a function that outputs a 'tabline' compatible strings that sets the tabline
-- format and style.
-- * Creates an autocommand to trigger these functions when the background or color scheme changes.
-- * Sets the default colorscheme (solarized) and background (dark).
--
-- User commands:
-- `ColorsBgToggle`: toggle light/dark background
-- `TabRename`: rename current tab
-- `TabRenameFileName`: rename current tab with current active buffer file name
--
local solarized = { blue = "#268bd2" }
-- Adjust highlights (for the solarized theme) to fit my personal tastes.
local function adjust_solarized_highlights()
-- Window bar style
vim.api.nvim_set_hl(0, "WinBarCwd", { fg = solarized.blue, italic = true })
vim.api.nvim_set_hl(0, "WinBarFilePath", { italic = true })
-- Matching delimiter
vim.api.nvim_set_hl(0, "MatchParen", { link = "CurSearch" })
-- Floating windows and popup menu windows follow the editor background, their borders too so
-- that the popup menu border draws a clean separation.
vim.opt.pumborder = "rounded"
vim.opt.pumwidth = 25 -- Minimum popup menu width
vim.api.nvim_set_hl(0, "NormalFloat", { link = "Normal" })
local normal_bg = vim.api.nvim_get_hl(0, { name = "Normal", link = false }).bg
vim.api.nvim_set_hl(0, "FloatBorder", { bg = normal_bg, update = true })
vim.api.nvim_set_hl(0, "Pmenu", { bg = normal_bg, update = true })
vim.api.nvim_set_hl(0, "PmenuSbar", { bg = normal_bg, update = true })
-- Currently selected tabpage
vim.api.nvim_set_hl(0, "TabLineSel", { bold = true, italic = true, update = true })
-- Todo hl group
vim.api.nvim_set_hl(0, "Todo", { bg = "Yellow", fg = "Black", bold = true })
-- Fold lines being the same color as the cursor line (default) make unfocused windows unreadable
-- Their background is set to blend in, the folds are visible enough with their dotted lines
vim.api.nvim_set_hl(0, "Folded", { bg = normal_bg, underline = true, update = true })
end
local function toggle_theme()
vim.opt.background = vim.o.background == "light" and "dark" or "light"
vim.notify("Color theme set to " .. vim.o.background)
end
-- Creates custom highlight groups for styling the tabpage title bars:
-- * TabLineWinCount: number of open windows in the tabpage
-- * TabLineSelWinCount: number of open windows in the currently active tabpage
local function create_tabpage_title_hl()
local normal = vim.api.nvim_get_hl(0, { name = "Normal", link = false })
local tabline = vim.api.nvim_get_hl(0, { name = "TabLine", link = false })
local tablinesel = vim.api.nvim_get_hl(0, { name = "TabLineSel", link = false })
vim.api.nvim_set_hl(0, "TabLineSel", { fg = normal.fg, update = true })
vim.api.nvim_set_hl(0, "TabLineWinCount", { fg = solarized.blue, bg = tabline.bg })
vim.api.nvim_set_hl(
0,
"TabLineSelWinCount",
{ fg = solarized.blue, bg = tablinesel.bg, bold = true }
)
end
-- Builds the window-count segment of a tabpage label, e.g. ` (2)[+] ` (no styling).
-- `is_modified` appends the `[+]` marker when any window in the tab has pending changes.
local function make_tab_info_label(win_count, is_modified)
local tab_win_count = "(" .. (win_count >= 10 and ">9" or tostring(win_count)) .. ")"
local tab_win_count_suffix = is_modified and "[+] " or " "
return " " .. tab_win_count .. tab_win_count_suffix
end
-- Builds the title segment of a tabpage label, padded or truncated to `width` (no styling).
-- Uses the tab's `tabname` if set, else the active buffer's file name, else `[No Name]`, prefixed
-- with `*` for the current tab and `-` for the last-accessed tab.
local function make_tab_label(id, is_current, width)
local is_last_accessed = vim.api.nvim_tabpage_get_number(id) == vim.fn.tabpagenr("#")
local tab_label_prefix = (is_current and "*" or "") .. (is_last_accessed and "-" or "")
local tab_label = vim.t[id].tabname
if tab_label == nil or tab_label == "" then
local win = vim.api.nvim_tabpage_get_win(id)
local bufname = vim.api.nvim_buf_get_name(vim.api.nvim_win_get_buf(win))
tab_label = vim.fn.fnamemodify(bufname, ":t")
end
if tab_label == "" then
tab_label = "[No Name]"
end
tab_label = tab_label_prefix .. tab_label
local display_width = vim.fn.strdisplaywidth(tab_label)
return (display_width > width)
and (vim.fn.strcharpart(tab_label, 0, width - 1) .. "…")
or (tab_label .. string.rep(" ", width - display_width))
end
-- Returns a string compatible with the 'tabline' option, used to set the tabline content and style.
-- Declared as a global function to be available as `v:lua.GetTabLine` in the Vimscript engine for
-- the 'tabline' option. See `:help 'statusline'`.
function GetTabLine()
local max_tab_label_width = 30
local s = ""
for _, id in pairs(vim.api.nvim_list_tabpages()) do
local is_current = id == vim.api.nvim_get_current_tabpage()
local is_modified = false
local wins = vim.api.nvim_tabpage_list_wins(id)
for _, win in ipairs(wins) do
if vim.bo[vim.api.nvim_win_get_buf(win)].modified then
is_modified = true
break
end
end
-- Define start of tabpage label (marks where clickage region begins)
s = s .. "%" .. vim.api.nvim_tabpage_get_number(id) .. "T"
local tab_info_label = make_tab_info_label(#wins, is_modified)
local tab_label_width = max_tab_label_width - vim.fn.strdisplaywidth(tab_info_label)
local tab_label = make_tab_label(id, is_current, tab_label_width)
s = s .. (is_current and "%#TabLineSelWinCount#" or "%#TabLineWinCount#") .. tab_info_label
s = s .. (is_current and "%#TabLineSel#" or "%#TabLine#") .. tab_label
end
return s .. "%#TabLineFill#"
end
local function rename_tab(opts)
vim.t.tabname = opts.args
vim.cmd.redrawtabline()
end
local function rename_tab_to_cur_filename()
vim.t.tabname = vim.fn.expand("%:t:r")
vim.cmd.redrawtabline()
end
-- Adjust highlights to fit my personal tastes.
local function adjust_highlights()
if vim.g.colors_name == "solarized" then
adjust_solarized_highlights()
end
create_tabpage_title_hl()
end
----------------------------------------------------------------------------------------------------
vim.api.nvim_create_autocmd("ColorScheme", {
desc = "Adjust custom highlights",
group = vim.g.dotfiles.augroup,
callback = adjust_highlights,
})
vim.api.nvim_create_autocmd("OptionSet", {
desc = "Adjust custom highlights on theme change",
pattern = "background",
group = vim.g.dotfiles.augroup,
callback = adjust_highlights,
})
vim.api.nvim_create_user_command(
"ColorsBgToggle",
toggle_theme,
{ desc = "Toggle light/dark theme" }
)
vim.api.nvim_create_user_command("TabRename", rename_tab, { nargs = 1 })
vim.api.nvim_create_user_command("TabRenameFileName", rename_tab_to_cur_filename, { nargs = 0 })
-- See `:help stl-%!`
vim.o.tabline = "%!v:lua.GetTabLine()"
vim.cmd.colorscheme("solarized")
vim.opt.background = "dark"
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