fix(script): add ending for raw loader of ThorVG (#7186)

Co-authored-by: SamNofee <sam@nofee.fun>

docs/details/libs/rlottie.rst

@@ -81,7 +81,9 @@ array. E.g.:
 
 .. code-block:: shell
 
-   ./filetohex.py path/to/lottie.json > out.txt
+   ./filetohex.py path/to/lottie.json --filter-character --null-terminate > out.txt
+
+``--filter-character`` filters out non-ASCII characters and ``--null-terminate`` makes sure that a trailing zero is appended to properly close the string.
 
 To create an animation from raw data:
 

docs/details/widgets/lottie.rst

@@ -69,7 +69,9 @@ array. E.g.:
 
 .. code-block:: shell
 
-   ./filetohex.py path/to/lottie.json > out.txt
+   ./filetohex.py path/to/lottie.json --filter-character --null-terminate > out.txt
+
+``--filter-character`` filters out non-ASCII characters and ``--null-terminate`` makes sure that a trailing zero is appended to properly close the string.
 
 To create an animation from data use
 :cpp:expr:`lv_lottie_set_src_data(lottie, data, sizeof(data))`

scripts/filetohex.py

@@ -1,11 +1,18 @@
 #!/usr/bin/env python3
 import sys
+import textwrap
+import re
 
 with open(sys.argv[1], 'r') as file:
     s = file.read()
 
 b = bytearray()
+
+if '--filter-character' in sys.argv:
+    s = re.sub(r'[^\x00-\xff]', '', s)
+if '--null-terminate' in sys.argv:
+    s += '\x00'
+
 b.extend(map(ord, s))
 
-for a in b: print(hex(a), end =", ")
-
+print(textwrap.fill(', '.join([hex(a) for a in b]), 96))