feat(python): include user defined routes from *_routes.py` files

In order to include custom routes:
- create a file <name>_routes.py
- implement endpoints and ensure that the file contains FastAPI's APIRouter named "router"

Part of #27

Author: php-coder

examples/python/app.py

@@ -1,6 +1,10 @@
 from fastapi import FastAPI
 from routes import router
 
+from custom_routes import router as custom_route
+
 app = FastAPI()
 
 app.include_router(router)
+
+app.include_router(custom_route)

examples/python/custom_routes.py

@@ -0,0 +1,8 @@
+from fastapi import APIRouter
+
+router = APIRouter()
+
+
+@router.get('/v1/hello')
+def greetings():
+    return {"hello": "world!"}

src/cli.js

@@ -82,15 +82,25 @@ const lang2extension = (lang) => {
     }
 }
 
+const findFileNamesEndWith = (dir, postfix) => {
+    return fs.readdirSync(dir).filter(name => name.endsWith(postfix))
+}
+
 const createApp = async (destDir, lang) => {
     const ext = lang2extension(lang)
     const fileName = `app.${ext}`
     console.log('Generate', fileName);
     const resultFile = path.join(destDir, fileName);
+    const customRouters = findFileNamesEndWith(destDir, `_routes.${ext}`)
+    if (customRouters.length > 0) {
+        customRouters.forEach(filename => console.log(`Include a custom router from ${filename}`))
+    }
 
     const resultedCode = await ejs.renderFile(
         `${__dirname}/templates/${fileName}.ejs`,
         {
+            // @todo #27 Document usage of user defined routes
+            'customRouteFilenames': customRouters
         }
     )
 

src/templates/app.py.ejs

@@ -1,6 +1,25 @@
+<%
+
+// "custom_routes.py" => "custom_route"
+function fileName2routerName(filename) {
+    return filename.replace(/_routes\.py$/, '_route')
+}
+
+// "custom_routes.py" => "custom_routes"
+function removeExtension(filename) {
+    return filename.replace(/\.py$/, '')
+}
+
+-%>
 from fastapi import FastAPI
 from routes import router
+<% customRouteFilenames.forEach(filename => { %>
+from <%= removeExtension(filename) %> import router as <%= fileName2routerName(filename) %>
+<% }) -%>
 
 app = FastAPI()
 
 app.include_router(router)
+<% customRouteFilenames.forEach(filename => { %>
+app.include_router(<%= fileName2routerName(filename) %>)
+<% }) -%>