some refacto and start adding file creation/removal..

lua/lib/file.lua

@@ -0,0 +1,97 @@
+local api = vim.api
+local buf, win
+
+local function scratch_buffer()
+    buf = api.nvim_create_buf(false, true)
+    api.nvim_buf_set_option(buf, 'bufhidden', 'wipe')
+
+    local width = api.nvim_get_option("columns")
+    local height = api.nvim_get_option("lines")
+
+    local win_height = 2
+    local win_width = 90
+
+    local row = math.ceil((height - win_height) / 2 - 1)
+    local col = math.ceil((width - win_width) / 2)
+
+    local opts = {
+        style = "minimal",
+        relative = "editor",
+        width = win_width,
+        height = win_height,
+        row = row,
+        col = col
+    }
+
+    local border_buf = api.nvim_create_buf(false, true)
+
+    local border_opts = {
+        style = "minimal",
+        relative = "editor",
+        width = win_width + 2,
+        height = win_height + 2,
+        row = row - 1,
+        col = col - 1
+    }
+
+    local border_lines = { '┌' .. string.rep('─', win_width) .. '┐' }
+    local middle_line = '│' .. string.rep(' ', win_width) .. '│'
+    for _ = 1, win_height do
+        table.insert(border_lines, middle_line)
+    end
+    table.insert(border_lines, '└' .. string.rep('─', win_width) .. '┘')
+    api.nvim_buf_set_lines(border_buf, 0, -1, false, border_lines)
+
+    api.nvim_open_win(border_buf, true, border_opts)
+    api.nvim_command('setlocal nocursorline winhighlight=Normal:LuaNoEndOfBufferPopup')
+    win = api.nvim_open_win(buf, true, opts)
+    api.nvim_command('setlocal nocursorline winhighlight=Normal:LuaTreePopup')
+    api.nvim_command('au BufWipeout <buffer> exe "silent bwipeout! "'..border_buf)
+end
+
+local function set_mappings()
+    local chars = {
+        'a', 'b', 'c', 'd', 'e', 'f', 'h', 'j', 'l', 'q', 'k', 'g', 'i', 'n', 'o', 'p', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
+    }
+    for _,v in ipairs(chars) do
+        api.nvim_buf_set_keymap(buf, 'n', v, '', { nowait = true, noremap = true, silent = true })
+        api.nvim_buf_set_keymap(buf, 'n', v:upper(), '', { nowait = true, noremap = true, silent = true })
+        api.nvim_buf_set_keymap(buf, 'n',  '<c-'..v..'>', '', { nowait = true, noremap = true, silent = true })
+        api.nvim_buf_set_keymap(buf, 'i',  '<c-'..v..'>', '', { nowait = true, noremap = true, silent = true })
+        api.nvim_buf_set_keymap(buf, 'i', '<c-' ..v:upper()..'>', '', { nowait = true, noremap = true, silent = true })
+    end
+end
+
+local function update_view(...)
+    api.nvim_buf_set_lines(buf, 0, -1, false, ...)
+    api.nvim_command('normal G')
+    api.nvim_command('startinsert!')
+end
+
+local function wrapper(...)
+    scratch_buffer()
+    update_view(...)
+    set_mappings()
+end
+
+local function add_file(path)
+    wrapper({ "Create File", path })
+end
+
+local function remove_file(filename, path, isdir)
+    local name = "File"
+    if isdir == true then name = "Directory" end
+    wrapper({ "Remove " .. name .. " " .. filename .. " ?",  "y/n: " })
+end
+
+local function rename_file(filename, path, isdir)
+    local name = "File"
+    if isdir == true then name = "Directory" end
+    wrapper({ "Rename " .. name, path .. filename })
+end
+
+return {
+    add_file = add_file;
+    remove_file = remove_file;
+    rename_file = rename_file;
+}

lua/lib/format.lua

@@ -0,0 +1,53 @@
+local api = vim.api
+
+local function get_padding(depth)
+    local str = ""
+
+    while 0 < depth do
+        str = str .. "  "
+        depth = depth - 1
+    end
+
+    return str
+end
+
+local function default_icons(_, isdir, open)
+    if isdir == true then
+        if open == true then return " " end
+        return " "
+    end
+
+    return ""
+end
+
+local function dev_icons(pathname, isdir, open)
+    if isdir == true then return default_icons(pathname, isdir, open) end
+
+    return api.nvim_call_function('WebDevIconsGetFileTypeSymbol', { pathname, isdir }) .. " "
+end
+
+local function get_icon_func_gen()
+    if api.nvim_call_function('exists', { "WebDevIconsGetFileTypeSymbol" }) == 0 then
+        return dev_icons
+    else
+        return default_icons
+    end
+end
+
+local get_icon = get_icon_func_gen()
+
+local function format_tree(tree)
+    local dirs = {}
+
+    for i, node in pairs(tree) do
+        local padding = get_padding(node.depth)
+        local icon = get_icon(node.path .. node.name, node.dir, node.open)
+        dirs[i] = padding ..  icon .. node.name
+    end
+
+    return dirs
+end
+
+return {
+    format_tree = format_tree;
+}