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/* (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */

#define TAGS \
const char *tags[] = { "dev", "work", "net", "fnord", NULL };

#define DEFMODE			dotile		/* dofloat */
#define FLOATSYMBOL		"><>"
#define TILESYMBOL		"[]="

#define FONT			"-*-terminus-medium-r-*-*-14-*-*-*-*-*-*-*"
#define NORMBGCOLOR		"#333333"
#define NORMFGCOLOR		"#cccccc"
#define SELBGCOLOR		"#336699"
#define SELFGCOLOR		"#dddddd"
#define STATUSBGCOLOR		"#222222"
#define STATUSFGCOLOR		"#99ccff"

#define MASTER			600		/* per thousand */
#define MODKEY			Mod1Mask
#define SNAP			40		/* pixel */

#define KEYS \
static Key key[] = { \
	/* modifier			key		function		argument */ \
	{ MODKEY|ShiftMask,		XK_Return,	spawn, \
		{ .cmd = "exec uxterm -bg black -fg '#eeeeee' -cr '#eeeeee' +sb -fn '"FONT"'" } }, \
	{ MODKEY,			XK_p,		spawn, \
		{ .cmd = "exe=\"$(lsx `echo $PATH | sed 's/:/ /g'` | sort -u " \
			" | dmenu -font '"FONT"' -normbg '"NORMBGCOLOR"' -normfg '"NORMFGCOLOR"' " \
			"-selbg '"SELBGCOLOR"' -selfg '"SELFGCOLOR"')\" && exec $exe" } }, \
	{ MODKEY,			XK_j,		focusnext,	{ 0 } }, \
	{ MODKEY,			XK_k,		focusprev,	{ 0 } }, \
	{ MODKEY,			XK_Return,	zoom,		{ 0 } }, \
	{ MODKEY,			XK_g,		resizemaster,	{ .i = 15 } }, \
	{ MODKEY,			XK_s,		resizemaster,	{ .i = -15 } }, \
	{ MODKEY|ShiftMask,		XK_0,		tag,		{ .i = -1 } }, \
	{ MODKEY|ShiftMask,		XK_1,		tag,		{ .i = 0 } }, \
	{ MODKEY|ShiftMask,		XK_2,		tag,		{ .i = 1 } }, \
	{ MODKEY|ShiftMask,		XK_3,		tag,		{ .i = 2 } }, \
	{ MODKEY|ShiftMask,		XK_4,		tag,		{ .i = 3 } }, \
	{ MODKEY|ControlMask|ShiftMask,	XK_1,		toggletag,	{ .i = 0 } }, \
	{ MODKEY|ControlMask|ShiftMask,	XK_2,		toggletag,	{ .i = 1 } }, \
	{ MODKEY|ControlMask|ShiftMask,	XK_3,		toggletag,	{ .i = 2 } }, \
	{ MODKEY|ControlMask|ShiftMask,	XK_4,		toggletag,	{ .i = 3 } }, \
	{ MODKEY|ShiftMask,		XK_c,		killclient,	{ 0 } }, \
	{ MODKEY,			XK_space,	togglemode,	{ 0 } }, \
	{ MODKEY|ShiftMask,		XK_space,	togglefloat,	{ 0 } }, \
	{ MODKEY,			XK_0,		view,		{ .i = -1 } }, \
	{ MODKEY,			XK_1,		view,		{ .i = 0 } }, \
	{ MODKEY,			XK_2,		view,		{ .i = 1 } }, \
	{ MODKEY,			XK_3,		view,		{ .i = 2 } }, \
	{ MODKEY,			XK_4,		view,		{ .i = 3 } }, \
	{ MODKEY|ControlMask,		XK_1,		toggleview,	{ .i = 0 } }, \
	{ MODKEY|ControlMask,		XK_2,		toggleview,	{ .i = 1 } }, \
	{ MODKEY|ControlMask,		XK_3,		toggleview,	{ .i = 2 } }, \
	{ MODKEY|ControlMask,		XK_4,		toggleview,	{ .i = 3 } }, \
	{ MODKEY|ShiftMask,		XK_q,		quit,		{ 0 } }, \
};

#define RULES \
static Rule rule[] = { \
	/* class:instance:title regex	tags regex	isfloat */ \
	{ "Firefox.*",			"net",		False }, \
	{ "Gimp.*",			NULL,		True }, \
	{ "MPlayer.*",			NULL,		True }, \
	{ "Acroread.*",			NULL,		True }, \
};
olor: #bb0066; font-weight: bold } /* Name.Namespace */ .highlight .py { color: #336699; font-weight: bold } /* Name.Property */ .highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */ .highlight .nv { color: #336699 } /* Name.Variable */ .highlight .ow { color: #008800 } /* Operator.Word */ .highlight .w { color: #bbbbbb } /* Text.Whitespace */ .highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */ .highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */ .highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
-- undo/redo by managing the sequence of events in the current session
-- based on https://github.com/akkartik/mu1/blob/master/edit/012-editor-undo.mu

-- Incredibly inefficient; we make a copy of lines on every single keystroke.
-- The hope here is that we're either editing small files or just reading large files.
-- TODO: highlight stuff inserted by any undo/redo operation
-- TODO: coalesce multiple similar operations

function record_undo_event(State, data)
  State.history[State.next_history] = data
  State.next_history = State.next_history+1
  for i=State.next_history,#State.history do
    State.history[i] = nil
  end
end

function undo_event(State)
  if State.next_history > 1 then
--?     print('moving to history', State.next_history-1)
    State.next_history = State.next_history-1
    local result = State.history[State.next_history]
    return result
  end
end

function redo_event(State)
  if State.next_history <= #State.history then
--?     print('restoring history', State.next_history+1)
    local result = State.history[State.next_history]
    State.next_history = State.next_history+1
    return result
  end
end

-- Copy all relevant global state.
-- Make copies of objects; the rest of the app may mutate them in place, but undo requires immutable histories.
function snapshot(State, s,e)
  -- Snapshot everything by default, but subset if requested.
  assert(s)
  if e == nil then
    e = s
  end
  assert(#State.lines > 0)
  if s < 1 then s = 1 end
  if s > #State.lines then s = #State.lines end
  if e < 1 then e = 1 end
  if e > #State.lines then e = #State.lines end
  -- compare with App.initialize_globals
  local event = {
    screen_top=deepcopy(State.screen_top1),
    selection=deepcopy(State.selection1),
    cursor=deepcopy(State.cursor1),
    current_drawing_mode=Drawing_mode,
    previous_drawing_mode=State.previous_drawing_mode,
    lines={},
    start_line=s,
    end_line=e,
    -- no filename; undo history is cleared when filename changes
  }
  -- deep copy lines without cached stuff like text fragments
  for i=s,e do
    local line = State.lines[i]
    if line.mode == 'text' then
      table.insert(event.lines, {mode='text', data=line.data})  -- I've forgotten: should we deepcopy(line.data)?
    elseif line.mode == 'drawing' then
      table.insert(event.lines, {mode='drawing', h=line.h, points=deepcopy(line.points), shapes=deepcopy(line.shapes), pending={}})
    else
      print(line.mode)
      assert(false)
    end
  end
  return event
end

function patch(lines, from, to)
--?   if #from.lines == 1 and #to.lines == 1 then
--?     assert(from.start_line == from.end_line)
--?     assert(to.start_line == to.end_line)
--?     assert(from.start_line == to.start_line)
--?     lines[from.start_line] = to.lines[1]
--?     return
--?   end
  assert(from.start_line == to.start_line)
  for i=from.end_line,from.start_line,-1 do
    table.remove(lines, i)
  end
  assert(#to.lines == to.end_line-to.start_line+1)
  for i=1,#to.lines do
    table.insert(lines, to.start_line+i-1, to.lines[i])
  end
end

function patch_placeholders(line_cache, from, to)
  assert(from.start_line == to.start_line)
  for i=from.end_line,from.start_line,-1 do
    table.remove(line_cache, i)
  end
  assert(#to.lines == to.end_line-to.start_line+1)
  for i=1,#to.lines do
    table.insert(line_cache, to.start_line+i-1, {})
  end
end

-- https://stackoverflow.com/questions/640642/how-do-you-copy-a-lua-table-by-value/26367080#26367080
function deepcopy(obj, seen)
  if type(obj) ~= 'table' then return obj end
  if seen and seen[obj] then return seen[obj] end
  local s = seen or {}
  local result = setmetatable({}, getmetatable(obj))
  s[obj] = result
  for k,v in pairs(obj) do
    result[deepcopy(k, s)] = deepcopy(v, s)
  end
  return result
end

function minmax(a, b)
  return math.min(a,b), math.max(a,b)
end