`create-astro` UI (#164)

* refactor: improve create-astro layout, build script

* feat(create-astro): v0.1.0

* docs(create-astro): add README

* feat(create-astro): add meta files to starter templates

1 files changed, 93 insertions, 0 deletions

diff --git a/packages/create-astro/src/components/App.tsx b/packages/create-astro/src/components/App.tsx
new file mode 100644
index 000000000..fd9192bb6
--- /dev/null
+++ b/packages/create-astro/src/components/App.tsx
@@ -0,0 +1,93 @@
+import React, {FC, useEffect} from 'react';
+import { prepareTemplate, isEmpty, emptyDir } from '../utils';
+import Header from './Header';
+import Install from './Install';
+import ProjectName from './ProjectName';
+import Template from './Template';
+import Confirm from './Confirm';
+import Finalize from './Finalize';
+
+interface Context {
+	use: 'npm'|'yarn';
+	run: boolean;
+	projectExists?: boolean;
+	force?: boolean;
+	projectName?: string;
+	template?: string;
+	templates: string[];
+	ready?: boolean;
+}
+
+const getStep = ({ projectName, projectExists: exists, template, force, ready }: Context) => {
+    switch (true) {
+        case !projectName: return {
+			key: 'projectName',
+			Component: ProjectName
+		};
+		case projectName && exists === true && typeof force === 'undefined': return {
+			key: 'force',
+			Component: Confirm
+		}
+        case (exists === false || force) && !template: return {
+			key: 'template',
+			Component: Template
+		};
+        case !ready: return {
+			key: 'install',
+			Component: Install
+		};
+		default: return {
+			key: 'final',
+			Component: Finalize
+		}
+    }
+}
+
+const App: FC<{ context: Context }> = ({ context }) => {
+	const [state, setState] = React.useState(context);
+	const step = React.useRef(getStep(context));
+	const onSubmit = (value: string|boolean) => {
+		const { key } = step.current;
+		const newState = { ...state, [key]: value };
+		step.current = getStep(newState)
+		setState(newState)
+	}
+
+	useEffect(() => {
+		let isSubscribed = true
+		if (state.projectName && typeof state.projectExists === 'undefined') {
+			const newState = { ...state, projectExists: !isEmpty(state.projectName) };
+			step.current = getStep(newState)
+			if (isSubscribed) {
+				setState(newState);
+			}
+		}
+
+		if (state.projectName && (state.projectExists === false || state.force) && state.template) {
+			if (state.force) emptyDir(state.projectName);
+			prepareTemplate(context.use, state.template, state.projectName).then(() => {
+				if (isSubscribed) {
+					setState(v => { 
+						const newState = {...v, ready: true };
+						step.current = getStep(newState);
+						return newState;
+					});
+				}
+			});
+		}
+
+		return () => {
+			isSubscribed = false;
+		}
+	}, [state]);
+	const { Component } = step.current;
+
+	return (
+		<>
+			<Header context={state}/>
+			<Component context={state} onSubmit={onSubmit} />
+		</>
+	)
+};
+
+export default App;