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+#!/usr/bin/env python3
+
+# Challenge 165
+#
+# Task 1: Scalable Vector Graphics (SVG)
+# Submitted by: Ryan J Thompson
+#
+# Scalable Vector Graphics (SVG) are not made of pixels, but lines, ellipses,
+# and curves, that can be scaled to any size without any loss of quality. If you
+# have ever tried to resize a small JPG or PNG, you know what I mean by "loss of
+# quality"! What many people do not know about SVG files is, they are simply XML
+# files, so they can easily be generated programmatically.
+#
+# For this task, you may use external library, such as Perl's SVG library,
+# maintained in recent years by our very own Mohammad S Anwar. You can instead
+# generate the XML yourself; it's actually quite simple. The source for the
+# example image for Task #2 might be instructive.
+#
+# Your task is to accept a series of points and lines in the following format,
+# one per line, in arbitrary order:
+#
+# Point: x,y
+#
+# Line: x1,y1,x2,y2
+# Example:
+#
+# 53,10
+# 53,10,23,30
+# 23,30
+#
+# Then, generate an SVG file plotting all points, and all lines. If done
+# correctly, you can view the output .svg file in your browser.
+
+def svg_header(width, height):
+    return f'''<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="{height}" width="{width}" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+'''
+
+def svg_footer():
+    return '''</svg>
+'''
+
+def svg_circle(cx, cy, r):
+    return f'<circle cx="{cx}" cy="{cy}" r="{r}" stroke="black" />\n'
+
+def svg_point(cx, cy):
+    return svg_circle(cx, cy, 1)
+
+def svg_line(x1, y1, x2, y2):
+    return f'<line x1="{x1}" y1="{y1}" x2="{x2}" y2="{y2}" stroke="black" />\n'
+
+import sys
+
+file = sys.argv[1] if len(sys.argv) > 1 else None
+if file is None:
+    raise Exception("usage: ch-1.py file.svg")
+
+with open(file, "w") as f:
+    f.write(svg_header(100, 100))
+    for line in sys.stdin:
+        line = line.strip()
+        p = line.split(',')
+        p = [int(coord.strip()) for coord in p]
+        if len(p) == 2:
+            f.write(svg_point(*p))
+        elif len(p) == 4:
+            f.write(svg_line(*p))
+        else:
+            raise Exception(f"cannot parse: {line}")
+    f.write(svg_footer())