numToStr · December 5, 2020 12:56 · Dec 5, 2020
diff --git a/fterm.lua b/fterm.lua
@@ -0,0 +1,109 @@
+local api = vim.api
+local cmd = vim.cmd
+local fn = vim.fn
+
+local W = {}
+local base_opt = {
+    relative = 'editor',
+    style = 'minimal'
+}
+
+cmd('hi def link FTerm Normal')
+
+function create_borders(height, width)
+    local border_lines = { '┌' .. string.rep('─', width) .. '┐' }
+    local middle_line = '|' .. string.rep(' ', width) .. '|'
+    for i=1, height do
+      table.insert(border_lines, middle_line)
+    end
+    table.insert(border_lines, '└' .. string.rep('─', width) .. '┘')
+
+    return border_lines
+end
+
+function open_float()
+    vim.g.last_win = fn.nvim_get_current_win()
+    vim.g.last_buf = fn.nvim_get_current_buf()
+    vim.g.last_pos = fn.winsaveview()
+
+    -- get dimensions
+    local width = api.nvim_get_option("columns")
+    local height = api.nvim_get_option("lines")
+
+    -- calculate our floating window size
+    local win_width = math.ceil(width * 0.8)
+    local win_height = math.ceil(height * 0.8 - 4)
+
+    -- and its starting position
+    local col = math.ceil((width - win_width) / 2)
+    local row = math.ceil((height - win_height) / 2 - 1)
+
+    local opt = vim.tbl_extend('keep', base_opt, {
+        width = win_width,
+        height = win_height,
+        col = col,
+        row = row,
+    })
+
+    local padding_opt = vim.tbl_extend('keep', base_opt, {
+        width = win_width + 2,
+        height = win_height + 2,
+        col = col - 1,
+        row = row - 1,
+    })
+
+    local padding_buf = api.nvim_create_buf(false, true)
+    local borders = create_borders(win_height, win_width)
+    api.nvim_buf_set_lines(padding_buf, 0, -1, false, borders)
+    local padding_win = api.nvim_open_win(padding_buf, true, padding_opt)
+    fn.nvim_win_set_option(padding_win, 'winhl', 'Normal:FTerm')
+
+    local buf = api.nvim_create_buf(false, true)
+    local win = api.nvim_open_win(buf, true, opt)
+    fn.nvim_win_set_option(win, 'winhl', 'Normal:FTerm')
+
+    fn.termopen(os.getenv('SHELL'))
+    cmd("startinsert")
+    cmd("autocmd! TermClose <buffer> lua close_float()")
+
+    W = { win, padding_win }
+end
+
+function close_float()
+    if next(W) == nil then
+        do return end
+    end
+
+    for _, win in ipairs(W) do
+        if api.nvim_win_is_valid(win) then
+            api.nvim_win_close(win, {})
+        end
+    end
+
+    W = {}
+end
+
+function toggle_float()
+    if next(W) == nil then
+        open_float()
+        do return end
+    end
+
+    close_float()
+
+    if next(vim.g.last_pos) then
+        -- cmd("wincmd l")
+        -- fn.setpos('.', last_pos)
+        -- cmd("keepalt b"..last_buf)
+        -- fn.winrestview(vim.g.last_pos)
+        -- last_pos = nil
+        -- print(vim.inspect(vim.g.last_win))
+        -- cmd(string.format('exe %d . "wincmd c"', vim.g.last_win))
+    end
+
+    -- print(vim.inspect(W))
+end
+
+cmd [[ command! WinOpen lua open_float() ]]
+cmd [[ command! WinToggle lua toggle_float() ]]
+cmd [[ command! WinClose lua close_float() ]]