MAJOR: Project rename and preparation for v1.0.0

I hope I haven't missed any for the renames!

lua/outline/view.lua

@@ -0,0 +1,75 @@
+local cfg = require('outline.config')
+
+local View = {}
+
+function View:new()
+  return setmetatable({ bufnr = nil, winnr = nil }, { __index = View })
+end
+
+---creates the outline window and sets it up
+function View:setup_view()
+  -- create a scratch unlisted buffer
+  self.bufnr = vim.api.nvim_create_buf(false, true)
+
+  -- delete buffer when window is closed / buffer is hidden
+  vim.api.nvim_buf_set_option(self.bufnr, 'bufhidden', 'delete')
+  -- create a split
+  vim.cmd(cfg.get_split_command())
+  -- resize to a % of the current window size
+  vim.cmd('vertical resize ' .. cfg.get_window_width())
+
+  -- get current (outline) window and attach our buffer to it
+  self.winnr = vim.api.nvim_get_current_win()
+  vim.api.nvim_win_set_buf(self.winnr, self.bufnr)
+
+  -- window stuff
+  vim.api.nvim_win_set_option(self.winnr, 'spell', false)
+  vim.api.nvim_win_set_option(self.winnr, 'signcolumn', 'no')
+  vim.api.nvim_win_set_option(self.winnr, 'foldcolumn', '0')
+  vim.api.nvim_win_set_option(self.winnr, 'number', false)
+  vim.api.nvim_win_set_option(self.winnr, 'relativenumber', false)
+  vim.api.nvim_win_set_option(self.winnr, 'winfixwidth', true)
+  vim.api.nvim_win_set_option(self.winnr, 'list', false)
+  vim.api.nvim_win_set_option(self.winnr, 'wrap', cfg.o.outline_window.wrap)
+  vim.api.nvim_win_set_option(self.winnr, 'winhl', cfg.o.outline_window.winhl)
+  vim.api.nvim_win_set_option(self.winnr, 'linebreak', true) -- only has effect when wrap=true
+  vim.api.nvim_win_set_option(self.winnr, 'breakindent', true) -- only has effect when wrap=true
+  --  Would be nice to use guides.markers.vertical as part of showbreak to keep
+  --  continuity of the tree UI, but there's currently no way to style the
+  --  color, apart from globally overriding hl-NonText, which will potentially
+  --  mess with other theme/user settings. So just use empty spaces for now.
+  vim.api.nvim_win_set_option(self.winnr, 'showbreak', '      ') -- only has effect when wrap=true.
+  -- buffer stuff
+  vim.api.nvim_buf_set_name(self.bufnr, 'OUTLINE')
+  vim.api.nvim_buf_set_option(self.bufnr, 'filetype', 'Outline')
+  vim.api.nvim_buf_set_option(self.bufnr, 'modifiable', false)
+
+  if cfg.o.outline_window.show_numbers or cfg.o.outline_window.show_relative_numbers then
+    vim.api.nvim_win_set_option(self.winnr, 'nu', true)
+  end
+
+  if cfg.o.outline_window.show_relative_numbers then
+    vim.api.nvim_win_set_option(self.winnr, 'rnu', true)
+  end
+
+  if cfg.o.outline_window.show_cursorline then
+    vim.api.nvim_win_set_option(self.winnr, 'cursorline', true)
+  end
+end
+
+function View:close()
+  if self.winnr then
+    vim.api.nvim_win_close(self.winnr, true)
+    self.winnr = nil
+    self.bufnr = nil
+  end
+end
+
+function View:is_open()
+  return self.winnr
+      and self.bufnr
+      and vim.api.nvim_buf_is_valid(self.bufnr)
+      and vim.api.nvim_win_is_valid(self.winnr)
+end
+
+return View