Add header during saving

README.md

@@ -19,3 +19,20 @@ rom_filename="${filename}.rom"
 
 ../uxn/bin/uxnasm $1 $rom_filename && ../uxn/bin/uxnemu $rom_filename
 ```
+
+### Inspect drawing file
+
+To check the data of the drawing manually you can hexdump it. Here you can see the header is correct `58 0a 1f 0a ff 0a`.
+
+```shell
+$ hexdump -C drawing.1line
+00000000  58 0a 1f 0a ff 0a 58 23  59 23 59 24 5a 24 5b 24  |X.....X#Y#Y$Z$[$|
+00000010  5c 24 5d 24 5d 25 5e 25  5e 26 5f 26 5f 27 60 27  |\$]$]%^%^&_&_'`'|
+00000020  60 28 60 29 61 29 61 2a  61 2b 60 2b 60 2c 60 2d  |`(`)a)a*a+`+`,`-|
+00000030  5f 2d 5f 2e 5f 2f 5e 2f  5e 30 5d 30 5d 31 5c 31  |_-_._/^/^0]0]1\1|
+00000040  5b 31 5b 32 5a 32 59 32  58 32 00 00 00 00 00 00  |[1[2Z2Y2X2......|
+00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+*
+00001550  00 00 00 00 00 00                                 |......|
+00001556
+```

one_line_canvas.tal

@@ -89,8 +89,8 @@
 
 @write-drawing-file-to-disk
 	;/filename .File/name DEO2
-	#1550 .File/length DEO2
-	;pxs .File/write DEO2
+	#1556 .File/length DEO2
+	;file-start .File/write DEO2
 	JMP2r
     &filename "drawing.1line $1
 
@@ -172,7 +172,6 @@
 	#f0b2 .System/b DEO2
 	JMP2r
 
-
 @cursor-sprite
 	20 20 d8 20 20 00 00 00
 (
@@ -187,6 +186,8 @@
 )
 
 @pxs-pt $2
+@file-start
+    58 0a 1f 0a ff 0a (88 31 255)
 @pxs $1550 ( 5456 )
 (
     pxs are the pixels of the drawing in order they are drawn

one_line_file_type_spec.md

@@ -29,15 +29,13 @@ An example file converted from binary to text would looks something like this. C
 are only there to show the different numbers and would not be in the data.
 ```
 88
-34
+31
 255
 0,0,1,0,2,0,3,0,4,0,5,255
 ```
 
 Or in hexadecimal:
 ```
-58
-22
-FF
+58 0A 1F 0A FF 0A
 0000010002000300040005FF
 ```

tasks.txt

@@ -0,0 +1,3 @@
+task: include header in generated .1line file as spec in ./one_line_file_type_spec.ms
+task: shift pixel x,y to be zero based
+task: set terminal byte