Optimized "end-of-corpus" handling (fixing issue #38) (#70)

* Better handling of end-of-corpus detection.

* Adjusted docstring.

backend/app/file_system.py

@@ -120,6 +120,7 @@ class PromptsFS:
 
     def get(self, prompt_number: int) -> response:
         """Get text from corpus by prompt number.
+        If end of corpus file is reached then '___CORPUS_END___' is returned as phrase.
 
         Args:
             prompt_number (int): Number of requested prompt from corpus.
@@ -132,8 +133,9 @@ class PromptsFS:
                 "prompt": self.data[prompt_number],
                 "total_prompt": len(self.data)
             }
-            return response(True, data=d)
         except IndexError as e:
-            # TODO: loggin
-            print(e)
-            return None
+            d = {
+                "prompt": "___CORPUS_END___",
+                "total_prompt": 0
+            }            
+        return response(True, data=d)

frontend/src/App/Record.js

@@ -131,11 +131,18 @@ class Record extends Component {
     getPrompt(uuid)
       .then(res => res.json())
       .then(res => {
-        if (res.success) {
-          this.setState({
-            prompt: res.data.prompt,
-            totalPrompt: res.data.total_prompt
-          });
+        if (res.data.prompt === "___CORPUS_END___") {
+            this.setState({
+              shouldRecord: false,
+              prompt: "*no more phrases in corpus to record*",
+              totalPrompt: res.data.total_prompt
+            })
+          }
+        if (res.success && res.data.prompt !== "___CORPUS_END___") {
+        this.setState({
+          prompt: res.data.prompt,
+          totalPrompt: res.data.total_prompt
+        });
         }
       });
   };