lines2.love/main.lua

utf8 = require 'utf8'

json = require('json')
require('array')

require('keychord')
require('button')

require('app')

require('icons')
require('drawing')
require('geom')
require('help')

require('file')
require('edit')
require('text')
require('move')
require('search')
require('select')
require('undo')

function love.load(arg)
  check_love_version()

  if love.filesystem.getInfo('config') then
    Settings = json.decode(love.filesystem.read('config'))
  end

  love.keyboard.setKeyRepeat(true)

  love.graphics.setBackgroundColor(1,1,1)

  ---- initialize globals
  Editor = {}

  -- for hysteresis in a few places
  Current_time = 0
  Last_focus_time = 0  -- https://love2d.org/forums/viewtopic.php?p=249700
  Last_resize_time = 0

  -- blinking cursor
  Cursor_time = 0

  ---- load editor
  if Settings then
    load_settings()
  else
    initialize_default_settings()
  end

  if #arg > 0 and Editor.filename ~= absolutize(arg[1]) then
    Editor.filename = arg[1]
    edit.scroll_to_top(Editor)  -- clear out stale locations for the old filename
  end
  if #arg > 1 then
    print('ignoring commandline args after '..arg[1])
  end

  love.window.setTitle('lines.love - '..Editor.filename)

  -- load the file
  load_from_disk(Editor)
  if not edit.valid_loc(Editor, Editor.screen_top) or
      not edit.valid_loc(Editor, Editor.cursor) then
    edit.scroll_to_top(Editor)
  end

  if rawget(_G, 'jit') then
    jit.off()
    jit.flush()
  end
end

function check_love_version()
  local supported_versions = {'11.5', '11.4', '12.0'}  -- put the recommended version first

  local major_version, minor_version = love.getVersion()
  local version = major_version..'.'..minor_version

  if array.find(supported_versions, version) == nil then
    error(
      ("This app hasn't been tested with LÖVE version %s. Please add %s to `supported_versions` in main.lua to try it out, and switch to version %s if you run into issues."):format(version, version, supported_versions[1]))
  end
end

function load_settings()
  local font = love.graphics.newFont(Settings.font_height)
  -- set up desired window dimensions and make window resizable
  _, _, App.screen.flags = love.window.getMode()
  App.screen.flags.resizable = true
  App.screen.width, App.screen.height = Settings.width, Settings.height
  love.window.setMode(App.screen.width, App.screen.height, App.screen.flags)
  set_window_position_from_settings(Settings)
  Editor = edit.new(Margin_top, Margin_left, App.screen.width-Margin_right, App.screen.height-Margin_top, font, Settings.font_height)
  Editor.filename = Settings.filename
  Editor.screen_top = Settings.screen_top
  Editor.cursor = Settings.cursor
end

function set_window_position_from_settings(settings)
  local os = love.system.getOS()
  if os == 'Linux' then
    -- love.window.setPosition doesn't quite seem to do what is asked of it on Linux.
    love.window.setPosition(settings.x, settings.y-37, settings.displayindex)
  else
    love.window.setPosition(settings.x, settings.y, settings.displayindex)
  end
end

function initialize_default_settings()
  local font_height = 20
  local font = love.graphics.newFont(font_height)
  initialize_window_geometry()
  Editor = edit.new(Margin_top, Margin_left, App.screen.width-Margin_right, App.screen.height-Margin_top, font, font_height)
  Settings = settings()
end

function settings()
  if Settings == nil then Settings = {} end
  Settings.x, Settings.y, Settings.displayindex = love.window.getPosition()
  return {
    x=Settings.x, y=Settings.y, displayindex=Settings.displayindex,
    width=App.screen.width, height=App.screen.height,
    font_height=Editor.font_height,
    filename=absolutize(Editor.filename),
    screen_top=Editor.screen_top, cursor=Editor.cursor
  }
end

function initialize_window_geometry()
  -- Initialize window width/height and make window resizable.
  --
  -- I get tempted to have opinions about window dimensions here, but they're
  -- non-portable:
  --  - maximizing doesn't work on mobile and messes things up
  --  - maximizing keeps the title bar on screen in Linux, but off screen on
  --    Windows. And there's no way to get the height of the title bar.
  -- It seems more robust to just follow LÖVE's default window size until
  -- someone overrides it.
  App.screen.width, App.screen.height, App.screen.flags = love.window.getMode()
  App.screen.flags.resizable = true
  love.window.setMode(App.screen.width, App.screen.height, App.screen.flags)
end

function love.resize(w,h)
--?   print(("Window resized to width: %d and height: %d."):format(w, h))
  App.screen.width, App.screen.height = w, h
  Editor.right = App.screen.width-Margin_right
  Editor.width = Editor.right-Editor.left
  Editor.bottom = App.screen.height-Margin_top
  Last_resize_time = Current_time
end

function love.filedropped(file)
  -- first make sure to save edits on any existing file
  if Editor.next_save then
    save_to_disk(Editor)
  end
  -- clear the slate for the new file
  Editor.filename = file:getFilename()
  file:open('r')
  Editor.lines = load_from_file(file)
  file:close()
  edit.scroll_to_top(Editor)
  love.window.setTitle('lines.love - '..Editor.filename)
end

function love.focus(in_focus)
  if in_focus then
    Last_focus_time = Current_time
  end
end

function love.draw()
  edit.draw(Editor)
end

function love.update(dt)
  Current_time = Current_time + dt
  -- some hysteresis while resizing
  if Current_time < Last_resize_time + 0.1 then
    return
  end
  --
  Cursor_time = Cursor_time + dt
  edit.update(Editor, dt)
end

function love.keychord_pressed(chord, key)
  -- ignore events for some time after window in focus (mostly alt-tab)
  if Current_time < Last_focus_time + 0.01 then
    return
  end
  --
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  return edit.keychord_press(Editor, chord, key)
end

function love.textinput(t)
  -- ignore events for some time after window in focus (mostly alt-tab)
  if Current_time < Last_focus_time + 0.01 then
    return
  end
  --
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  return edit.text_input(Editor, t)
end

function love.keyreleased(key, scancode)
  -- ignore events for some time after window in focus (mostly alt-tab)
  if Current_time < Last_focus_time + 0.01 then
    return
  end
  --
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  return edit.key_release(Editor, key, scancode)
end

function love.mousepressed(x,y, mouse_button)
--?   print('mouse press', x,y)
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  love.keyboard.setTextInput(true)  -- bring up keyboard on touch screen
  return edit.mouse_press(Editor, x,y, mouse_button)
end

function love.mousereleased(x,y, mouse_button)
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  return edit.mouse_release(Editor, x,y, mouse_button)
end

function love.mousemoved(x,y, dx,dy, is_touch)
end

function love.wheelmoved(dx,dy)
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  return edit.mouse_wheel_move(Editor, dx,dy)
end

function love.mousefocus(in_focus)
end

function love.quit()
  if Disable_all_quit_handlers then return end
  Settings = settings()
  love.filesystem.write('config', json.encode(Settings))
  edit.quit(Editor)
end