move libastal to /core

starting point of the monorepo

1 files changed, 276 insertions, 0 deletions

diff --git a/core/lua/astal/widget.lua b/core/lua/astal/widget.lua
new file mode 100644
index 0000000..d2dadc6
--- /dev/null
+++ b/core/lua/astal/widget.lua
@@ -0,0 +1,276 @@
+local lgi = require("lgi")
+local Astal = lgi.require("Astal", "0.1")
+local Gtk = lgi.require("Gtk", "3.0")
+local GObject = lgi.require("GObject", "2.0")
+local Binding = require("astal.binding")
+local Variable = require("astal.variable")
+local exec_async = require("astal.process").exec_async
+
+local function filter(tbl, fn)
+    local copy = {}
+    for key, value in pairs(tbl) do
+        if fn(value, key) then
+            if type(key) == "number" then
+                table.insert(copy, value)
+            else
+                copy[key] = value
+            end
+        end
+    end
+    return copy
+end
+
+local function map(tbl, fn)
+    local copy = {}
+    for key, value in pairs(tbl) do
+        copy[key] = fn(value)
+    end
+    return copy
+end
+
+local flatten
+flatten = function(tbl)
+    local copy = {}
+    for _, value in pairs(tbl) do
+        if type(value) == "table" and getmetatable(value) == nil then
+            for _, inner in pairs(flatten(value)) do
+                table.insert(copy, inner)
+            end
+        else
+            table.insert(copy, value)
+        end
+    end
+    return copy
+end
+
+local function set_children(parent, children)
+    children = map(flatten(children), function(item)
+        if Gtk.Widget:is_type_of(item) then
+            return item
+        end
+        return Gtk.Label({
+            visible = true,
+            label = tostring(item),
+        })
+    end)
+
+    -- remove
+    if Gtk.Bin:is_type_of(parent) then
+        local rm = parent:get_child()
+        if rm ~= nil then
+            parent:remove(rm)
+        end
+    end
+
+    -- FIXME: add rest of the edge cases like Stack
+    if Astal.Box:is_type_of(parent) then
+        parent:set_children(children)
+    elseif Astal.CenterBox:is_type_of(parent) then
+        parent.start_widget = children[1]
+        parent.center_widget = children[2]
+        parent.end_widget = children[3]
+    elseif Astal.Overlay:is_type_of(parent) then
+        parent:set_child(children[1])
+        children[1] = nil
+        parent:set_overlays(children)
+    elseif Gtk.Container:is_type_of(parent) then
+        for _, child in pairs(children) do
+            if Gtk.Widget:is_type_of(child) then
+                parent:add(child)
+            end
+        end
+    end
+end
+
+local function merge_bindings(array)
+    local function get_values(...)
+        local args = { ... }
+        local i = 0
+        return map(array, function(value)
+            if getmetatable(value) == Binding then
+                i = i + 1
+                return args[i]
+            else
+                return value
+            end
+        end)
+    end
+
+    local bindings = filter(array, function(v)
+        return getmetatable(v) == Binding
+    end)
+
+    if #bindings == 0 then
+        return array
+    end
+
+    if #bindings == 1 then
+        return bindings[1]:as(get_values)
+    end
+
+    return Variable.derive(bindings, get_values)()
+end
+
+local function astalify(ctor)
+    function ctor:hook(object, signalOrCallback, callback)
+        if type(object.subscribe) == "function" then
+            local unsub = object.subscribe(function(...)
+                signalOrCallback(self, ...)
+            end)
+            self.on_destroy = unsub
+            return
+        end
+        local id = object["on_" .. signalOrCallback](function(_, ...)
+            callback(self, ...)
+        end)
+        self.on_destroy = function()
+            GObject.signal_handler_disconnect(object, id)
+        end
+    end
+
+    function ctor:toggle_class_name(name, on)
+        Astal.toggle_class_name(self, name, on)
+    end
+
+    return function(tbl)
+        if tbl == nil then
+            tbl = {}
+        end
+
+        local bindings = {}
+        local setup = tbl.setup
+
+        -- collect children
+        local children = merge_bindings(flatten(filter(tbl, function(_, key)
+            return type(key) == "number"
+        end)))
+
+        -- default visible to true
+        if type(tbl.visible) ~= "boolean" then
+            tbl.visible = true
+        end
+
+        -- filter props
+        local props = filter(tbl, function(_, key)
+            return type(key) == "string" and key ~= "setup"
+        end)
+
+        -- handle on_ handlers that are strings
+        for prop, value in pairs(props) do
+            if string.sub(prop, 0, 2) == "on" and type(value) ~= "function" then
+                props[prop] = function()
+                    exec_async(value, print, print)
+                end
+            end
+        end
+
+        -- handle bindings
+        for prop, value in pairs(props) do
+            if getmetatable(value) == Binding then
+                bindings[prop] = value
+                props[prop] = value:get()
+            end
+        end
+
+        -- construct, attach bindings, add children
+        local widget = ctor()
+
+        for prop, value in pairs(props) do
+            widget[prop] = value
+        end
+
+        for prop, binding in pairs(bindings) do
+            widget.on_destroy = binding:subscribe(function(v)
+                widget[prop] = v
+            end)
+        end
+
+        if getmetatable(children) == Binding then
+            set_children(widget, children:get())
+            widget.on_destroy = children:subscribe(function(v)
+                set_children(widget, v)
+            end)
+        else
+            if #children > 0 then
+                set_children(widget, children)
+            end
+        end
+
+        if type(setup) == "function" then
+            setup(widget)
+        end
+
+        return widget
+    end
+end
+
+local Widget = {
+    astalify = astalify,
+    Box = astalify(Astal.Box),
+    Button = astalify(Astal.Button),
+    CenterBox = astalify(Astal.CenterBox),
+    -- TODO: CircularProgress
+    DrawingArea = astalify(Gtk.DrawingArea),
+    Entry = astalify(Gtk.Entry),
+    EventBox = astalify(Astal.EventBox),
+    -- TODO: Fixed
+    -- TODO: FlowBox
+    Icon = astalify(Astal.Icon),
+    Label = astalify(Gtk.Label),
+    LevelBar = astalify(Astal.LevelBar),
+    -- TODO: ListBox
+    Overlay = astalify(Astal.Overlay),
+    Revealer = astalify(Gtk.Revealer),
+    Scrollable = astalify(Astal.Scrollable),
+    Slider = astalify(Astal.Slider),
+    -- TODO: Stack
+    Switch = astalify(Gtk.Switch),
+    Window = astalify(Astal.Window),
+}
+
+Gtk.Widget._attribute.css = {
+    get = Astal.widget_get_css,
+    set = Astal.widget_set_css,
+}
+
+Gtk.Widget._attribute.class_name = {
+    get = function(self)
+        local result = ""
+        local strings = Astal.widget_set_class_names(self)
+        for i, str in ipairs(strings) do
+            result = result .. str
+            if i < #strings then
+                result = result .. " "
+            end
+        end
+        return result
+    end,
+    set = function(self, class_name)
+        local names = {}
+        for word in class_name:gmatch("%S+") do
+            table.insert(names, word)
+        end
+        Astal.widget_set_class_names(self, names)
+    end,
+}
+
+Gtk.Widget._attribute.cursor = {
+    get = Astal.widget_get_cursor,
+    set = Astal.widget_set_cursor,
+}
+
+Gtk.Widget._attribute.click_through = {
+    get = Astal.widget_get_click_through,
+    set = Astal.widget_set_click_through,
+}
+
+Astal.Box._attribute.children = {
+    get = Astal.Box.get_children,
+    set = Astal.Box.set_children,
+}
+
+return setmetatable(Widget, {
+    __call = function(_, ctor)
+        return astalify(ctor)
+    end,
+})