Use Jinja2, start to support sprites

pytools/BUILD

@@ -2,9 +2,10 @@ load("@pytools_deps//:requirements.bzl", "requirement")
 
 py_binary(
     name = "font",
-    srcs = ["font.py"],
+    srcs = ["font.py", "shared.py"],
     deps = [
         requirement("pillow"),
+        requirement("Jinja2"),
     ],
     visibility = ["//visibility:public"],
 )

pytools/font.py

@@ -1,6 +1,13 @@
 from typing import Tuple
 from PIL import Image
 import sys
+import shared
+
+TEMPLATE = """
+// generated code! be nice!
+#include "sys/sys.h"
+sys_glyph {{ font_name }}[{{ n_glyphs }}] = { {{- glyphs|join(", ") -}} };
+""".lstrip()
 
 
 def main(font_name, n_glyphs, fname_png, fname_c):
@@ -8,11 +15,13 @@ def main(font_name, n_glyphs, fname_png, fname_c):
     assert(len(glyphs) == n_glyphs), f"must be exactly {n_glyphs} glyphs"
 
     with open(fname_c, "wt") as output:
-        output.writelines([
-            "// generated code! be nice!\n",
-            "#include \"sys/sys.h\"\n",
-            f"sys_glyph {font_name}[{n_glyphs}] = {{{', '.join(str(g) for g in glyphs)}}};\n"
-        ])
+        output.write(
+            shared.templates.from_string(TEMPLATE).render(
+                font_name=font_name,
+                n_glyphs=n_glyphs,
+                glyphs=glyphs,
+            )
+        )
 
 
 def load_glyphs(fname_png: str):

pytools/requirements.lock

@@ -0,0 +1,4 @@
+pillow==10.2.0
+Jinja2==3.1.3
+## The following requirements were added by pip freeze:
+MarkupSafe==2.1.5

pytools/requirements.txt

@@ -1 +1,2 @@
-pillow==10.2.0
+pillow==10.2.0
+Jinja2==3.1.3

pytools/shared.py

@@ -0,0 +1,6 @@
+from jinja2 import Environment, BaseLoader, select_autoescape
+
+templates = Environment(
+    loader=BaseLoader(),
+    autoescape=select_autoescape(),
+)