From: Carl Worth <cworth@cworth.org>
Date: Fri, 23 Dec 2022 02:04:13 +0000 (-0800)
Subject: Hook the code panel up to actually execute something
X-Git-Url: https://git.cworth.org/git?p=zombocom-ai;a=commitdiff_plain;h=1e320ca83bc7836cc1462bc67e4048c5c074a469

Hook the code panel up to actually execute something

And switch from SvgTurtle to Cairo instead, since I actually wrote
that and all.

There's no puzzle here yet, but it does have all the interactivity
necessary to do something that's hopefully interesting.
---

diff --git a/bus.html b/bus.html
index 845b048..214174c 100644
--- a/bus.html
+++ b/bus.html
@@ -121,10 +121,10 @@
 	Magic School Bus Central Processor
       </h1>
       <form id="form">
-	<textarea id="code" rows="10" width="100%">t.forward(100);
-t.right(90);
-t.forward(100);
-	</textarea>
+	<textarea id="code" rows="10" width="100%">cr.move_to(10,10);
+cr.line_to(100, 100);
+cr.set_line_width(6);
+cr.stroke();</textarea>
 	<button type="submit">Run code</button>
       </form>
       <img id="output"></img>
diff --git a/index.js b/index.js
index 9b7270b..b0a115f 100644
--- a/index.js
+++ b/index.js
@@ -15,7 +15,7 @@ const port = 2122;
 
 const python_path = '/usr/bin/python3'
 const generate_image_script = '/home/cworth/src/zombocom-ai/generate-image.py'
-const run_turtle_script = '/home/cworth/src/zombocom-ai/run-turtle.py'
+const interpret_cairo_script = '/home/cworth/src/zombocom-ai/interpret-cairo-to-svg.py'
 const state_file = 'zombocom-state.json'
 const targets_dir = '/srv/cworth.org/zombocom/targets'
 const images_dir = '/srv/cworth.org/zombocom/images'
@@ -197,7 +197,7 @@ io_bus.on("connection", (socket) => {
 
     socket.on('run', code => {
 	try {
-	    output = child_process.execFileSync(python_path, [run_turtle_script, code], { input: code });
+	    output = child_process.execFileSync(python_path, [interpret_cairo_script, code], { input: code });
 	    // Grab just first line of output
 	    const nl = output.indexOf("\n");
 	    if (nl === -1)
diff --git a/interpret-cairo-to-svg.py b/interpret-cairo-to-svg.py
new file mode 100755
index 0000000..bc3ad35
--- /dev/null
+++ b/interpret-cairo-to-svg.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+
+import cairo
+import tempfile
+import os
+import sys
+
+OUTPUT_DIR_PREFIX='/srv/cworth.org/zombocom'
+OUTPUT_DIR="{}/busart".format(OUTPUT_DIR_PREFIX)
+
+input = sys.stdin.read()
+
+# Do at least a modicum of a safety check
+if "import" in input:
+    sys.stderr.write("Error: Cowardly refusing to interpret script with 'import'")
+    sys.exit(1)
+
+(fd, filename) = tempfile.mkstemp(suffix=".svg", prefix="busart", dir=OUTPUT_DIR);
+os.close(fd)
+os.chmod(filename, 0o644);
+
+# Also delete our import for some more safety
+del tempfile
+del os
+del sys
+
+with cairo.SVGSurface(filename, 512, 512) as surface:
+    cr = cairo.Context(surface);
+    del cairo
+    cr.set_line_width(6);
+    exec(input)
+
+web_file = filename.removeprefix(OUTPUT_DIR_PREFIX);
+
+print(web_file);
+
+
diff --git a/run-turtle.py b/run-turtle.py
old mode 100755
new mode 100644
index fb74b02..bb117fd
--- a/run-turtle.py
+++ b/run-turtle.py
@@ -1,32 +1,35 @@
 #!/usr/bin/env python3
 
-from svg_turtle import SvgTurtle
+import cairo
 import tempfile
 import os
+import sys
 
 OUTPUT_DIR_PREFIX='/srv/cworth.org/zombocom'
 OUTPUT_DIR="{}/busart".format(OUTPUT_DIR_PREFIX)
 
-t = SvgTurtle(512,512);
+input = sys.stdin.read()
 
-t.pencolor('red');
-
-t.penup();
-t.right(180);
-t.forward(200);
-t.right(180);
-t.pendown();
-
-for i in range(50):
-    t.forward(100);
-    t.left(123);
+# Do at least a modicum of a safety check
+if "import" in input:
+    sys.stderr.write("Error: Cowardly refusing to interpret script with 'import'")
+    sys.exit(1)
 
 (fd, filename) = tempfile.mkstemp(suffix=".svg", prefix="busart", dir=OUTPUT_DIR);
 os.close(fd)
-
-t.save_as(filename);
 os.chmod(filename, 0o644);
 
+# Also delete our import for some more safety
+del tempfile
+del os
+del sys
+
+with cairo.SVGSurface(filename, 512, 512) as surface:
+    cr = cairo.Context(surface);
+    del cairo
+    cr.set_line_width(6);
+    exec(input);
+
 web_file = filename.removeprefix(OUTPUT_DIR_PREFIX);
 
 print(web_file);