MAJOR: Project rename and preparation for v1.0.0

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

lua/outline/preview.lua

@@ -0,0 +1,163 @@
+local so = require 'outline'
+local cfg = require 'outline.config'
+local hover = require 'outline.hover'
+
+local M = {}
+
+local state = {
+  preview_buf = nil,
+  preview_win = nil,
+}
+
+local function is_current_win_outline()
+  local curwin = vim.api.nvim_get_current_win()
+  return curwin == so.view.winnr
+end
+
+local function has_code_win()
+  local isWinValid = vim.api.nvim_win_is_valid(so.state.code_win)
+  if not isWinValid then
+    return false
+  end
+  local bufnr = vim.api.nvim_win_get_buf(so.state.code_win)
+  local isBufValid = vim.api.nvim_buf_is_valid(bufnr)
+  return isBufValid
+end
+
+M.has_code_win = has_code_win
+
+local function get_width_offset()
+  ---@type integer
+  local outline_winnr = so.view.winnr
+  local width = cfg.get_preview_width() + 3
+  local has_numbers = vim.api.nvim_win_get_option(outline_winnr, "number")
+  has_numbers = has_numbers or vim.api.nvim_win_get_option(outline_winnr, "relativenumber")
+
+  if has_numbers then
+    width = width + 4
+  end
+
+  if cfg.o.outline_window.position == 'right' then
+    width = 0 - width
+  else
+    width = vim.api.nvim_win_get_width(outline_winnr) + 1
+  end
+
+  return width
+end
+
+local function get_height()
+  return vim.api.nvim_list_uis()[1].height
+end
+
+local function get_hovered_node()
+  local hovered_line = vim.api.nvim_win_get_cursor(so.view.winnr)[1]
+  local node = so.state.flattened_outline_items[hovered_line]
+  return node
+end
+
+local function update_preview(code_buf)
+  code_buf = code_buf or vim.api.nvim_win_get_buf(so.state.code_win)
+
+  local node = get_hovered_node()
+  if not node then
+    return
+  end
+  local lines = vim.api.nvim_buf_get_lines(code_buf, 0, -1, false)
+
+  if state.preview_buf ~= nil then
+    vim.api.nvim_buf_set_lines(state.preview_buf, 0, -1, 0, lines)
+    vim.api.nvim_win_set_cursor(
+      state.preview_win,
+      { node.line + 1, node.character }
+    )
+  end
+end
+
+local function setup_preview_buf()
+  local code_buf = vim.api.nvim_win_get_buf(so.state.code_win)
+  local ft = vim.api.nvim_buf_get_option(code_buf, 'filetype')
+
+  local function treesitter_attach()
+    local ts_highlight = require 'nvim-treesitter.highlight'
+
+    ts_highlight.attach(state.preview_buf, ft)
+  end
+
+  -- user might not have tree sitter installed
+  pcall(treesitter_attach)
+
+  vim.api.nvim_buf_set_option(state.preview_buf, 'syntax', ft)
+  vim.api.nvim_buf_set_option(state.preview_buf, 'bufhidden', 'delete')
+  vim.api.nvim_win_set_option(state.preview_win, 'cursorline', true)
+  update_preview(code_buf)
+end
+
+local function set_bg_hl()
+  vim.api.nvim_win_set_option(state.preview_win, 'winhl', cfg.o.preview_window.winhl)
+  vim.api.nvim_win_set_option(state.preview_win, 'winblend', cfg.o.preview_window.winblend)
+end
+
+local function show_preview()
+  if state.preview_win == nil and state.preview_buf == nil then
+    state.preview_buf = vim.api.nvim_create_buf(false, true)
+    vim.api.nvim_buf_attach(state.preview_buf, false, {
+      on_detach = function()
+        state.preview_buf = nil
+        state.preview_win = nil
+      end,
+    })
+    local height = get_height()
+    local winheight = math.ceil(height / 2)
+    state.preview_win = vim.api.nvim_open_win(state.preview_buf, false, {
+      relative = 'win',
+      height = winheight,
+      width = cfg.get_preview_width(),
+      bufpos = { 0, 0 },
+      col = get_width_offset(),
+      -- Position preview window middle-aligned vertically
+      row = math.floor((height - winheight) / 2) - 1,
+      border = cfg.o.preview_window.border,
+    })
+    setup_preview_buf()
+  else
+    update_preview()
+  end
+end
+
+function M.show()
+  if not is_current_win_outline() or #vim.api.nvim_list_wins() < 2 then
+    return
+  end
+
+  show_preview()
+  set_bg_hl()
+  if cfg.o.preview_window.open_hover_on_preview then
+    hover.show_hover()
+  end
+end
+
+function M.close()
+  if has_code_win() then
+    if
+      state.preview_win ~= nil and vim.api.nvim_win_is_valid(state.preview_win)
+    then
+      vim.api.nvim_win_close(state.preview_win, true)
+    end
+    if
+      state.hover_win ~= nil and vim.api.nvim_win_is_valid(state.hover_win)
+    then
+      vim.api.nvim_win_close(state.hover_win, true)
+    end
+  end
+end
+
+function M.toggle()
+  if state.preview_win ~= nil then
+    M.close()
+  else
+    M.show()
+  end
+end
+
+return M