My first lua config

Directories are self explanatory

+ ui/* for ui stuff
+ statusbar in ui
+ keymap/* for keymaps
+ general for very minimal, required stuff

lua/ui/init.lua

@@ -0,0 +1,113 @@
+-- see `:help` for any questions
+-- use `&<var>` to show value of vimscript variable
+
+require('ui/statusbar')
+
+-- API --
+local o     = vim.o     -- options
+local go    = vim.go    -- only-global options
+local bo    = vim.bo    -- buffer local options
+local wo    = vim.wo    -- window local options
+
+local cmd   = vim.cmd   -- vim commands
+local fn    = vim.fn    -- vim functions
+local opt   = vim.opt   -- vim option object
+
+local g     = vim.g     -- global variables
+local b     = vim.b     -- buffer local variables
+local w     = vim.w     -- window local variables
+local t     = vim.t     -- tab local variables
+local v     = vim.v     -- variables
+local env   = vim.env   -- environment variables
+
+
+
+o.showcmd       = true
+wo.cursorline   = true
+cmd 'filetype plugin indent on'
+o.lazyredraw    = true
+o.showmatch     = true  -- matching bracket
+
+
+-- Completion Menu
+o.wildmenu  = true
+o.wildmode  = 'list:longest,full'
+
+
+-- Character Representation
+o.sbr   = '…' -- line wrap character
+o.list  = true
+opt.listchars = { -- white space representation
+    tab         = '▸ ',
+    trail       = '•',
+    nbsp        = '␣',
+    extends     = '⟩',
+    precedes    = '⟨'
+}
+
+
+-- Hybrid Numbers
+function hybrid_numbers(x)
+    wo.number           = true
+    wo.relativenumber   = x
+end
+cmd([[
+autocmd BufEnter,FocusGained,InsertLeave * lua hybrid_numbers(true)
+autocmd BufLeave,FocusLost,InsertEnter * lua hybrid_numbers(false)
+]])
+
+
+-- Search
+o.incsearch = true  -- show matching patterns
+o.hlsearch  = true  -- highlight all patterns
+
+
+-- Status Bar
+o.laststatus = 2 -- always visible
+vim.o.statusline = "%!luaeval('status_bar()')"
+
+
+-- Tabs
+local indent_size = 4 --change to filetype
+opt.expandtab   = true  -- tab key inserts spaces
+opt.tabstop     = indent_size
+opt.shiftwidth  = indent_size
+opt.softtabstop = 0     -- to disable
+opt.smarttab    = true
+
+--adjust to filetype
+function no_ro_retab()
+    if vim.inspect(opt.readonly:get()) == false then
+        cmd '%retab'
+    end
+end
+cmd 'autocmd BufReadPost,BufWritePre,BufWritePost,BufNewFile * lua no_ro_retab()'
+
+
+-- Text Width
+wo.wrap         = true
+wo.linebreak    = true
+bo.textwidth    = 70
+
+bo.formatoptions = table.concat({
+    'j',    -- remove comment when joining lines
+    'w',    -- non-white space at end of line means end of paragraph
+    'c',    -- insert comment when auto wrapping textwidth
+    'r',    -- insert comment after hitting <enter>
+    'o',    -- insert comment after hitting "o"
+    'q',    -- format comments with "gq"
+    'l'     -- long lines are not broken in insert mode
+})
+
+cmd([[
+autocmd BufEnter * highlight OverLength ctermbg=darkgrey guibg=#592929
+autocmd BufEnter * match OverLength /\%71v.*/
+]]) --rewrite in lua
+
+
+--WIP
+-- Filetype: txt, md, tex
+-- break lines, autowrap, autoformat, recognize numbered lists
+--fix before enabling
+--autocmd BufRead,BufNewFile *.md,*.txt,*.tex set fo-=l
+--autocmd BufRead,BufNewFile *.md,*.txt,*.tex set fo+=tan

lua/ui/statusbar.lua

@@ -0,0 +1,113 @@
+-- see `:help` for any questions
+-- use `&<var>` to show value of vimscript variable
+
+-- API --
+local o     = vim.o     -- options
+local go    = vim.go    -- only-global options
+local bo    = vim.bo    -- buffer local options
+local wo    = vim.wo    -- window local options
+
+local cmd   = vim.cmd   -- vim commands
+local fn    = vim.fn    -- vim functions
+local opt   = vim.opt   -- vim option object
+
+local g     = vim.g     -- global variables
+local b     = vim.b     -- buffer local variables
+local w     = vim.w     -- window local variables
+local t     = vim.t     -- tab local variables
+local v     = vim.v     -- variables
+local env   = vim.env   -- environment variables
+
+
+--Later generalize into plugin
+-- read from bottom up to understand `status_bar()`
+
+local function file_state()
+    if vim.bo.modified then
+        return "+"
+    elseif vim.bo.readonly then
+        return "-"
+    end
+    return ""
+end
+
+local function diagnostics()
+    local buffer_number = vim.fn.bufnr('%')
+    local severity_levels = {
+                    -- level,prefix
+        errors      = {'Error', 'E:'},
+        warnings    = {'Warning', 'W:'},
+        info        = {'Information', 'I:'},
+        hints       = {'Hint', 'H:'}
+    }
+    local out = ''
+    for _,v in pairs(severity_levels) do
+        local d = vim.lsp.diagnostic.get_count(
+            buffer_number,
+            v[1] -- level
+        )
+        if d > 0 then
+            out = out .. v[2] .. d .. ' '
+        end
+    end
+    return out
+end
+
+local function highlight(group, color)
+    cmd('highlight ' .. group .. ' cterm='..color .. ' gui='..color)
+end
+
+highlight('StatusLine', 'bold,reverse')
+highlight('StatusLineDark', 'bold')
+
+local light_highlight   = '%#StatusLine#'
+local dark_highlight    = '%#StatusLineDark#'
+
+function section(items)
+    local out = ''
+    for _,item in pairs(items) do
+        if item ~= '' and item ~= nil then
+            if out == '' then
+                out = item
+            else
+                out = out .. ' | ' .. item
+            end
+        end
+    end
+    return ' ' .. out .. ' '
+end
+
+function sections(items)
+    local out = {}
+    local n = 1
+    for _,item in pairs(items) do
+        if item == '%=' then
+            table.insert(out, item)
+            n = 1 -- reset coloring at different parts
+        else
+            if (n % 2) == 1 then
+                table.insert(out, light_highlight..section(item))
+            else
+                table.insert(out, dark_highlight..section(item))
+            end
+            n = n + 1
+        end
+    end
+    return out
+end
+
+function status_bar()
+    return table.concat(sections({
+        -- Stage Left
+        {'%f', file_state()},
+        {diagnostics()},
+        '%=',
+        -- Stage Right
+        {
+            vim.b.gitsigns_status,
+            vim.bo.filetype
+        },
+        {'%p%%'},
+        {'%c,%l'}
+    }))
+end