Add Flutter text to speech demo (#1087)

flutter-examples/tts/generate-asset-list.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+
+"""
+This file assumes that
+  assets:
+is the last line in ./pubspec.yaml
+
+It reads the file names of all files from the ./assets folder
+and turns them as assets and writes them into ./pubspec.yaml
+"""
+
+import os
+
+
+def main():
+    target = "./assets"
+    excluded_ext = [
+        ".gitkeep",
+        ".onnx.json",
+        ".py",
+        ".sh",
+        "*.md",
+        "MODEL_CARD",
+    ]
+    sep = "    "
+    ss = []
+    for root, d, files in os.walk(target):
+        for f in files:
+            skip = False
+            for p in excluded_ext:
+                if f.endswith(p):
+                    skip = True
+                    break
+
+            if skip:
+                continue
+
+            t = os.path.join(root, f).replace("\\", "/")
+            ss.append("{sep}- {t}".format(sep=sep, t=t))
+
+    # read pub.spec.yaml
+    with open("./pubspec.yaml", encoding="utf-8") as f:
+        lines = f.readlines()
+
+    found_assets = False
+    with open("./pubspec.yaml", "w", encoding="utf-8") as f:
+        for line in lines:
+            if line == "  assets:\n":
+                assert found_assets is False
+                found_assets = True
+                if len(ss) > 0:
+                    f.write(line)
+
+            if not found_assets:
+                f.write(line)
+                continue
+
+            for s in ss:
+                f.write("{s}\n".format(s=s))
+            break
+
+        if not found_assets and ss:
+            f.write("  assets:\n")
+            for s in ss:
+                f.write("{s}\n".format(s=s))
+
+
+if __name__ == "__main__":
+    main()