diff -r aa24812aaf98 -r 80ca91007f15 src/luan/modules/editor/editor.luan
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/luan/modules/editor/editor.luan	Tue Apr 15 12:45:26 2025 -0600
@@ -0,0 +1,608 @@
+local Luan = require "luan:Luan.luan"
+local error = Luan.error
+local ipairs = Luan.ipairs or error()
+local range = Luan.range or error()
+local stringify = Luan.stringify or error()
+local String = require "luan:String.luan"
+local sub_string = String.sub or error()
+local replace = String.replace or error()
+local starts_with = String.starts_with or error()
+local to_number = String.to_number or error()
+local find = String.find or error()
+local regex = String.regex or error()
+local regex_quote = String.regex_quote or error()
+local regex_quote_replacement = String.regex_quote_replacement or error()
+local repeated = String.repeated or error()
+local Io = require "luan:Io.luan"
+local print = Io.print or error()
+local new_file = Io.schemes.file or error()
+local Math = require "luan:Math.luan"
+local min = Math.min or error()
+local Swing = require "luan:swing/Swing.luan"
+local new_frame = require("luan:swing/Frame.luan").new or error()
+local new_label = require("luan:swing/Label.luan").new or error()
+local new_text_area = require("luan:swing/Text_area.luan").new or error()
+local new_scroll_pane = require("luan:swing/Scroll_pane.luan").new or error()
+local new_text_area_line_numbers = require("luan:swing/Text_area_line_numbers.luan").new or error()
+local new_menu_bar = require("luan:swing/Menu_bar.luan").new or error()
+local Menu = require "luan:swing/Menu.luan"
+local new_menu = Menu.new or error()
+local separator = Menu.separator or error()
+local new_menu_item = require("luan:swing/Menu_item.luan").new or error()
+local new_check_box_menu_item = require("luan:swing/Check_box_menu_item.luan").new or error()
+local int_to_color = require("luan:swing/Color.luan").int_to_color or error()
+local Border = require "luan:swing/Border.luan"
+local create_empty_border = Border.create_empty_border or error()
+local create_line_border = Border.create_line_border or error()
+local no_border = Border.no_border or error()
+local Layout = require "luan:swing/Layout.luan"
+local new_mig_layout = Layout.new_mig_layout or error()
+local Option_pane = require "luan:swing/Option_pane.luan"
+local show_message_dialog = Option_pane.show_message_dialog or error()
+local show_input_dialog = Option_pane.show_input_dialog or error()
+local new_dialog = require("luan:swing/Dialog.luan").new or error()
+local new_panel = require("luan:swing/Component.luan").new_panel or error()
+local new_button = require("luan:swing/Button.luan").new or error()
+local new_check_box = require("luan:swing/Check_box.luan").new or error()
+local new_text_field = require("luan:swing/Text_field.luan").new or error()
+local Logging = require "luan:logging/Logging.luan"
+local logger = Logging.logger "editor"
+
+
+local new_window
+
+local function action_listener(fn)
+	return function(_)
+		fn()
+	end
+end
+
+local function add_menu_bar(window)
+	local document = window.text_area.document
+	local revert = new_menu_item{
+		text = "Revert"
+		enabled = window.has_file
+		action_listener = action_listener(window.revert)
+	}
+	local undo = new_menu_item{
+		text = "Undo"
+		accelerator = "meta Z"
+		action_listener = action_listener(document.undo)
+	}
+	local redo = new_menu_item{
+		text = "Redo"
+		accelerator = "meta shift Z"
+		action_listener = action_listener(document.redo)
+	}
+	local function update_undo_redo()
+		undo.set_enabled(document.can_undo())
+		redo.set_enabled(document.can_redo())
+	end
+	window.update_undo_redo = update_undo_redo  -- dont gc
+	update_undo_redo()
+	document.add_undo_listener(update_undo_redo)
+
+	local find_menu_item = new_check_box_menu_item{
+		text = "Find and Replace"
+		accelerator = "meta F"
+		action_listener = function(event)
+			window.show_find_panel(event.source.state)
+		end
+	}
+	window.find_menu_item = find_menu_item
+
+	local menu_bar = new_menu_bar{
+		menus = {
+			new_menu{
+				text = "File"
+				menu_items = {
+					new_menu_item{
+						text = "New File"
+						accelerator = "meta N"
+						action_listener = function(_)
+							new_window()
+						end
+					}
+					new_menu_item{
+						text = "Open..."
+						accelerator = "meta O"
+						action_listener = action_listener(window.open)
+					}
+					new_menu_item{
+						text = "Save"
+						accelerator = "meta S"
+						action_listener = function(_)
+							if window.save() then
+								revert.set_enabled(true)
+							end
+						end
+					}
+					revert
+				}
+			}
+			new_menu{
+				text = "Edit"
+				menu_items = {
+					undo
+					redo
+					separator
+					new_menu_item{
+						text = "Cut"
+						accelerator = "meta X"
+						action_listener = action_listener(window.text_area.cut)
+					}
+					new_menu_item{
+						text = "Copy"
+						accelerator = "meta C"
+						action_listener = action_listener(window.text_area.copy)
+					}
+					new_menu_item{
+						text = "Paste"
+						accelerator = "meta V"
+						action_listener = action_listener(window.text_area.paste)
+					}
+					separator
+					new_menu_item{
+						text = "Indent"
+						accelerator = "meta CLOSE_BRACKET"
+						action_listener = action_listener(window.indent)
+					}
+					new_menu_item{
+						text = "Unindent"
+						accelerator = "meta OPEN_BRACKET"
+						action_listener = action_listener(window.unindent)
+					}
+					separator
+					new_menu_item{
+						text = "Select All"
+						accelerator = "meta A"
+						action_listener = action_listener(window.text_area.select_all)
+					}
+				}
+			}
+			new_menu{
+				text = "Find"
+				menu_items = {
+					find_menu_item
+					new_menu_item{
+						text = "Find Case Insensitive"
+						action_listener = window.find_case_insensitive
+					}
+					new_menu_item{
+						text = "Convert Leading Tabs to Spaces"
+						action_listener = window.tabs_to_spaces
+					}
+					new_menu_item{
+						text = "Convert Leading Spaces to Tabs"
+						action_listener = window.spaces_to_tabs
+					}
+				}
+			}
+			new_menu{
+				text = "View"
+				menu_items = {
+					new_check_box_menu_item{
+						text = "Word Wrap"
+						state = window.text_area.line_wrap
+						action_listener = function(event)
+							window.text_area.line_wrap = event.source.state
+						end
+					}
+					new_check_box_menu_item{
+						text = "Show Whitespace"
+						action_listener = function(event)
+							window.text_area.show_whitespace(event.source.state)
+						end
+					}
+					new_menu_item{
+						text = "Show Cursor Column"
+						action_listener = function(_)
+							show_message_dialog( window.frame, "Cursor Column: "..window.cursor_column() )
+						end
+					}
+					new_menu_item{
+						text = "Goto Line"
+						accelerator = "meta G"
+						action_listener = function(_)
+							local input = show_input_dialog( window.frame, "Goto line" )
+							local line = input and to_number(input)
+							if line ~= nil then
+								window.goto(line)
+							end
+						end
+					}
+				}
+			}
+		}
+	}
+	window.frame.set_menu_bar(menu_bar)
+end
+
+local function get_matches(text,s)
+	local r = regex(s)
+	local matches = {}
+	local i = 1
+	local n = #text
+	while i <= n do
+		local j1, j2 = r.find(text,i)
+		if j1 == nil then
+			break
+		end
+		j2 = j2 + 1
+		if j1 == j2 then
+			i = j2 + 1
+		else
+			matches[#matches+1] = { start=j1, end_=j2 }
+			i = j2
+		end
+	end
+	return matches
+end
+
+local function make_find_panel(window)
+	local text_area = window.text_area
+	local find_field, replace_field, regex_check_box, output
+	local function find_match(event)
+		--logger.info("action "..event.action)
+		local s = find_field.text
+		if #s == 0 then
+			output.text = ""
+			return
+		end
+		if not regex_check_box.is_selected then
+			s = regex_quote(s)
+		end
+		local matches
+		try
+			matches = get_matches( text_area.text, s )
+		catch e
+			output.text = "Regex error: "..e.get_message()
+			return
+		end
+		local n_matches = #matches
+		if n_matches == 0 then
+			output.text = "0 matches"
+			return
+		end
+		local action = event.action
+		if action == "next" then
+			local _, pos = text_area.get_selection()
+			for i, match in ipairs(matches) do
+				if match.start >= pos then
+					text_area.set_selection( match.start, match.end_ )
+					output.text = i.." of "..n_matches.." matches"
+					return
+				end
+			end
+			local match = matches[1]
+			text_area.set_selection( match.start, match.end_ )
+			output.text = "1 of "..n_matches.." matches; wrapped past end"
+		elseif action == "previous" then
+			local pos = text_area.get_selection()
+			for i in range(n_matches,1,-1) do
+				local match = matches[i]
+				if match.end_ <= pos then
+					text_area.set_selection( match.start, match.end_ )
+					output.text = i.." of "..n_matches.." matches"
+					return
+				end
+			end
+			local match = matches[n_matches]
+			text_area.set_selection( match.start, match.end_ )
+			output.text = n_matches.." of "..n_matches.." matches; wrapped past end"
+		else
+			error(action)
+		end
+	end
+	local function replace_match(event)
+		local find = find_field.text
+		if #find == 0 then
+			output.text = ""
+			return
+		end
+		local replace = replace_field.text
+		if not regex_check_box.is_selected then
+			find = regex_quote(find)
+			replace = regex_quote_replacement(replace)
+		end
+		local r
+		try
+			r = regex(find)
+		catch e
+			output.text = "Regex error: "..e.get_message()
+			return
+		end
+		local new, n
+		local action = event.action
+		if action == "replace" then
+			local selection = text_area.selected_text
+			new, n = r.gsub(selection,replace)
+			if n > 0 then
+				text_area.selected_text = new
+			end
+		elseif action == "replace_all" then
+			local text = text_area.text
+			new, n = r.gsub(text,replace)
+			if n > 0 then
+				text_area.text = new
+			end
+		else
+			error(action)
+		end
+		output.text = n.." replacements"
+	end
+	find_field = new_text_field{
+		constraints = "growx"
+		show_whitespace = true
+		action = "next"
+		action_listener = find_match
+	}
+	replace_field = new_text_field{
+		constraints = "growx"
+		show_whitespace = true
+		action = "replace"
+		action_listener = replace_match
+	}
+	regex_check_box = new_check_box{
+		text = "Use Regex"
+	}
+	output = new_label{
+		constraints = "span"
+	}
+	local find_panel = new_panel{
+		constraints = "growy 0,growx"
+		layout = new_mig_layout("","[][grow][grow 0]")
+		visible = false
+		children = {
+			new_label{
+				constraints = "right"
+				text = "Find:"
+			}
+			find_field
+			new_button{
+				constraints = "grow"
+				text = "Find Next"
+				action = "next"
+				action_listener = find_match
+			}
+			new_button{
+				constraints = "grow,wrap"
+				text = "Find Previous"
+				action = "previous"
+				action_listener = find_match
+			}
+			new_label{
+				constraints = "right"
+				text = "Replace:"
+			}
+			replace_field
+			new_button{
+				constraints = "grow"
+				text = "Replace"
+				tool_tip_text = "Replace matches in selected text"
+				action = "replace"
+				action_listener = replace_match
+			}
+			new_button{
+				constraints = "grow,wrap"
+				text = "Replace All"
+				action = "replace_all"
+				action_listener = replace_match
+			}
+			new_panel{
+				constraints = "span,wrap"
+				layout = new_mig_layout("insets 0,gap 16px")
+				children = {
+					regex_check_box
+					new_button{
+						text = "Learn About Regular Expressions"
+					}
+				}
+			}
+			output
+		}
+	}
+	function window.show_find_panel(visible)
+		find_panel.visible = visible
+		if visible then
+			find_field.request_focus_in_window()
+		end
+	end
+	function window.find_case_insensitive(_)
+		find_panel.visible = true
+		window.find_menu_item.is_selected = true
+		regex_check_box.is_selected = true
+		find_field.text = "(?i)\Q\E"
+		find_field.set_selection(7)
+		find_field.request_focus_in_window()
+		output.text = [[Put search text between "\Q" and "\E"]]
+	end
+	function window.tabs_to_spaces(_)
+		find_panel.visible = true
+		window.find_menu_item.is_selected = true
+		regex_check_box.is_selected = true
+		find_field.text = [[(?m)^(\t*)\t]]
+		local spaces = repeated( " ", text_area.tab_size )
+		replace_field.text = "$1"..spaces
+		output.text = [[Do "Replace All" until 0 replacements]]
+	end
+	function window.spaces_to_tabs(_)
+		find_panel.visible = true
+		window.find_menu_item.is_selected = true
+		regex_check_box.is_selected = true
+		local tab_size = text_area.tab_size
+		find_field.text = `%>(?m)^(( {<%=tab_size%>})*) {<%=tab_size%>}<%`
+		replace_field.text = "$1\t"
+		output.text = [[Do "Replace All" until 0 replacements]]
+	end
+	return find_panel
+end
+
+local n_windows = 0
+local documents = {}
+
+function new_window(file)
+	local window = {}
+	window.has_file = file~=nil and file.is_file()
+	local text_area = new_text_area{
+		wrap_style_word = true
+		line_wrap = true
+		tab_size = 4
+		font = { family="Monospaced", size=13 }
+	}
+	window.text_area = text_area
+	local title = file and file.canonical().to_string() or "new"
+	if file ~= nil then
+		local document = documents[title]
+		if document == nil then
+			documents[title] = text_area.document
+		else
+			text_area.document = document
+		end
+		if file.is_file() then
+			text_area.text = file.read_text()
+			text_area.document.clear_unedited()
+		end
+	end
+	text_area.set_selection(0)
+	local find_panel = make_find_panel(window)
+	local frame = new_frame{
+		preferred_size = { width=700, height=700 }
+		content_pane = new_panel{
+			layout = new_mig_layout("insets 0,wrap,fill,hidemode 3","","[][grow 0]")
+			children = {
+				new_scroll_pane{
+					constraints = "grow"
+					view = text_area
+					row_header_view = new_text_area_line_numbers{
+						text_area = text_area
+						foreground_color = int_to_color(0x888888)
+						border = create_empty_border(0,8,0,8)
+					}
+				}
+				find_panel
+			}
+		}
+	}
+	window.frame = frame
+	frame.add_close_listener(function()
+		n_windows = n_windows - 1
+		if n_windows == 0 then
+			Luan.exit()
+		end
+	end)
+	local function set_title()
+		local s = title
+		if not text_area.document.is_unedited() then
+			s = s.." *"
+		end
+		frame.title = s
+	end
+	set_title()
+	window.set_title = set_title  -- dont gc
+	text_area.document.add_undo_listener(set_title)
+	function window.open()
+		local file_chooser = frame.file_chooser_load()
+		if file ~= nil then
+			file_chooser.directory = file.parent()
+		end
+		file_chooser.visible = true
+		local new_file = file_chooser.file
+		if new_file ~= nil then
+			new_window(new_file)
+		end
+	end
+	function window.save()
+		if file == nil then
+			local file_chooser = frame.file_chooser_save()
+			file_chooser.visible = true
+			file = file_chooser.file
+			if file == nil then
+				return false
+			end
+			title = file.canonical().to_string()
+			frame.title = title
+			documents[title] = text_area.document
+		end
+		file.write_text(text_area.text)
+		text_area.document.set_unedited()
+		return true
+	end
+	function window.revert()
+		local selection = text_area.get_selection()
+		local text = file.read_text()
+		text_area.text = text
+		text_area.set_selection(min(selection,#text+1))
+		text_area.document.set_unedited()
+	end
+	local function selection_lines()
+		local start_seletion, end_selection = text_area.get_selection()
+		local end_ = end_selection == start_seletion and end_selection or end_selection - 1
+		local start_line = text_area.get_line_from_position(start_seletion)
+		local end_line = text_area.get_line_from_position(end_)
+		local start_pos = text_area.get_line_start_position(start_line)
+		local end_pos = text_area.get_line_end_position(end_line)
+		local text = text_area.text
+		text = sub_string(text,start_pos,end_pos-2)
+		return {
+			text = text
+			start_pos = start_pos
+			length = #text
+			lines = end_line - start_line + 1
+			start_seletion = start_seletion
+			end_selection = end_selection
+		}
+	end
+	function window.indent()
+		local r = selection_lines()
+		local text = r.text
+		local start_pos = r.start_pos
+		text = "\t"..replace(text,"\n","\n\t")
+		text_area.replace(start_pos,r.length,text)
+		--logger.info(stringify{text_area.get_selection()})
+		text_area.set_selection( r.start_seletion+1, r.end_selection+r.lines )
+	end
+	function window.unindent()
+		local r = selection_lines()
+		local text = r.text
+		text = "\n"..text
+		local start_seletion = r.start_seletion
+		if starts_with(text,"\n\t") then
+			start_seletion = start_seletion - 1
+		end
+		local len1 = #text
+		text = replace(text,"\n\t","\n")
+		local len2 = #text
+		local end_selection = r.end_selection - (len1 - len2)
+		text = sub_string(text,2)
+		text_area.replace(r.start_pos,r.length,text)
+		text_area.set_selection(start_seletion,end_selection)
+	end
+	function window.cursor_column()
+		local cursor_pos = text_area.get_selection()
+		local line = text_area.get_line_from_position(cursor_pos)
+		local start_line_pos = text_area.get_line_start_position(line)
+		return cursor_pos - start_line_pos + 1
+	end
+	function window.goto(line)
+		local pos = text_area.get_line_start_position(line)
+		text_area.set_selection(pos)
+	end
+	add_menu_bar(window)
+	frame.pack()
+	frame.visible = true
+	text_area.request_focus_in_window()
+	n_windows = n_windows + 1
+end
+
+Swing.run(function()
+	local args = Luan.arg
+	if #args == 0 then
+		new_window()
+	else
+		for _, arg in ipairs(args) do
+			local file = new_file(arg)
+			new_window(file)
+		end
+	end
+end)