feat(FileManager): add built-in file manager

core/systems/file/file_object.gd

@@ -0,0 +1,4 @@
+extends FilesystemObject
+class_name FileObject
+
+

core/systems/file/filesystem_object.gd

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+extends RefCounted
+class_name FilesystemObject
+
+var path: String
+
+
+func _init(path_to: String) -> void:
+	path = path_to
+
+
+## Returns the mime type of the given filesystem object
+func get_mime_type() -> String:
+	var cmd := Command.new("xdg-mime", ["query", "filetype", path])
+	var code := await cmd.execute()
+	if code != OK:
+		return ""
+
+	return cmd.stdout
+
+
+## Return the icon texture for this node
+func get_icon() -> Texture2D:
+	return null

core/ui/components/file_manager.gd

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+extends Control
+
+var HOME := OS.get_environment("HOME")
+
+@onready var line_edit := $%LineEdit as LineEdit
+@onready var tree1 := $%Tree1 as Tree
+
+# https://unix.stackexchange.com/questions/419895/if-i-have-a-mime-type-how-do-i-get-its-associated-icon-from-the-current-appearan
+
+# Get mime type:
+#   $ xdg-mime query filetype entrypoint.gd
+#   application/x-gdscript
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	line_edit.text = HOME
+
+	var root := tree1.create_item()
+	for dir in DirAccess.get_directories_at(HOME):
+		var item := root.create_child()
+		item.set_text(0, dir)
+
+	for file in DirAccess.get_files_at(HOME):
+		var item := root.create_child()
+		item.set_text(0, file)

core/ui/components/file_manager.tscn

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+[gd_scene load_steps=4 format=3 uid="uid://um4833sfah6a"]
+
+[ext_resource type="Script" path="res://core/ui/components/file_manager.gd" id="1_ox374"]
+[ext_resource type="PackedScene" uid="uid://cr83fmlociwko" path="res://core/ui/components/card_icon_button.tscn" id="2_bbd5j"]
+[ext_resource type="Texture2D" uid="uid://8pmccsyfv3u7" path="res://assets/ui/icons/search.svg" id="3_onyah"]
+
+[node name="FileManager" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_ox374")
+
+[node name="PanelContainer" type="PanelContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="MarginContainer" type="MarginContainer" parent="PanelContainer"]
+layout_mode = 2
+theme_override_constants/margin_left = 20
+theme_override_constants/margin_top = 20
+theme_override_constants/margin_right = 20
+theme_override_constants/margin_bottom = 20
+
+[node name="VBoxContainer" type="VBoxContainer" parent="PanelContainer/MarginContainer"]
+layout_mode = 2
+
+[node name="MarginContainer" type="MarginContainer" parent="PanelContainer/MarginContainer/VBoxContainer"]
+layout_mode = 2
+theme_override_constants/margin_left = 60
+theme_override_constants/margin_right = 60
+
+[node name="HBoxContainer2" type="HBoxContainer" parent="PanelContainer/MarginContainer/VBoxContainer/MarginContainer"]
+layout_mode = 2
+
+[node name="LineEdit" type="LineEdit" parent="PanelContainer/MarginContainer/VBoxContainer/MarginContainer/HBoxContainer2"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+text = "/home"
+
+[node name="SearchButton" parent="PanelContainer/MarginContainer/VBoxContainer/MarginContainer/HBoxContainer2" instance=ExtResource("2_bbd5j")]
+unique_name_in_owner = true
+layout_mode = 2
+texture = ExtResource("3_onyah")
+
+[node name="HBoxContainer" type="HBoxContainer" parent="PanelContainer/MarginContainer/VBoxContainer"]
+layout_mode = 2
+size_flags_vertical = 3
+
+[node name="Tree1" type="Tree" parent="PanelContainer/MarginContainer/VBoxContainer/HBoxContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+hide_root = true
+
+[node name="Tree2" type="Tree" parent="PanelContainer/MarginContainer/VBoxContainer/HBoxContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+hide_root = true
+
+[node name="Tree3" type="Tree" parent="PanelContainer/MarginContainer/VBoxContainer/HBoxContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+hide_root = true