feat: ship project templates (window default, docking) (#10)

templates/window (default): minimal imgui.app window.
templates/docking: IDE-style DockBuilder layout with docking-full.
Generated projects pin {{self.version}}, so the scaffold can never drift
from the library version it shipped with. Consumed by mcpp's package
templates: `mcpp new app --template imgui[:docking]` /
`mcpp new --list-templates imgui` (requires mcpp > 0.0.48).

Author: Sunrisepeak

templates/docking/mcpp.toml.in

@@ -0,0 +1,6 @@
+[package]
+name        = "{{project.name}}"
+version     = "0.1.0"
+
+[dependencies]
+{{self.name}} = { version = "{{self.version}}", features = ["docking-full"] }

templates/docking/src/main.cpp.in

@@ -0,0 +1,31 @@
+// {{project.name}} — generated from {{self.name}}@{{self.version}}:docking
+import imgui.core;
+import imgui.app;
+
+int main() {
+    return ImGui::App::run({.title = "{{project.name}}"}, [] {
+        auto dockspace = ImGui::DockSpaceOverViewport();
+
+        static bool layout_built = false;
+        if (!layout_built) {
+            layout_built = true;
+            const auto root = dockspace;
+            auto left  = ImGui::DockBuilderSplitNode(
+                dockspace, ImGui::Dir_Left, 0.22f, nullptr, &dockspace);
+            auto down  = ImGui::DockBuilderSplitNode(
+                dockspace, ImGui::Dir_Down, 0.28f, nullptr, &dockspace);
+            auto right = ImGui::DockBuilderSplitNode(
+                dockspace, ImGui::Dir_Right, 0.30f, nullptr, &dockspace);
+            ImGui::DockBuilderDockWindow("Scene",     left);
+            ImGui::DockBuilderDockWindow("Console",   down);
+            ImGui::DockBuilderDockWindow("Inspector", right);
+            ImGui::DockBuilderDockWindow("Viewport",  dockspace);
+            ImGui::DockBuilderFinish(root);
+        }
+
+        ImGui::Begin("Scene");     ImGui::TextUnformatted("scene tree");  ImGui::End();
+        ImGui::Begin("Viewport");  ImGui::TextUnformatted("drag tabs to re-split / detach"); ImGui::End();
+        ImGui::Begin("Inspector"); ImGui::TextUnformatted("properties");  ImGui::End();
+        ImGui::Begin("Console");   ImGui::TextUnformatted("logs");        ImGui::End();
+    });
+}

templates/docking/template.toml

@@ -0,0 +1,3 @@
+[template]
+description  = "IDE-style docking layout + detachable OS windows (docking-full)"
+post_message = "`mcpp run`: four docked panes; drag a tab outside to detach it."

templates/window/mcpp.toml.in

@@ -0,0 +1,6 @@
+[package]
+name        = "{{project.name}}"
+version     = "0.1.0"
+
+[dependencies]
+{{self.name}} = "{{self.version}}"

templates/window/src/main.cpp.in

@@ -0,0 +1,11 @@
+// {{project.name}} — generated from {{self.name}}@{{self.version}}:window
+import imgui.core;
+import imgui.app;
+
+int main() {
+    return ImGui::App::run({.title = "{{project.name}}"}, [] {
+        ImGui::Begin("{{project.name}}");
+        ImGui::TextUnformatted("Hello from mcpp + imgui");
+        ImGui::End();
+    });
+}

templates/window/template.toml

@@ -0,0 +1,4 @@
+[template]
+description  = "Minimal imgui.app window"
+default      = true
+post_message = "cd into the project and run `mcpp run` — the window appears."