Revert "Merge pull request #407 from googlefonts/parts"

This reverts commit ca02334, reversing
changes made to 5c73fa2.

This PR laid the groundworks for #414, however the latter needs more work before merge.
I want to make a release now with the changes to maximum_color, so I will revert-revert this immediately afterwards.

src/nanoemoji/nanoemoji.py

@@ -249,13 +249,6 @@ def write_preamble(nw):
         )
         nw.newline()
 
-    module_rule(
-        nw,
-        "write_part_file",
-        f"--reuse_tolerance $reuse_tolerance --output_file $out $in",
-    )
-    nw.newline()
-
     nw.newline()
 
 
@@ -312,10 +305,6 @@ def picosvg_dest(clipped: bool, input_svg: Path) -> Path:
     return _dest_for_src(picosvg_dest, out_dir, input_svg, ".svg")
 
 
-def part_file_dest(picosvg_file: Path) -> Path:
-    return picosvg_file.with_suffix(".parts.json")
-
-
 def bitmap_dest(input_svg: Path) -> Path:
     return _dest_for_src(bitmap_dest, bitmap_dir(), input_svg, ".png")
 
@@ -348,7 +337,6 @@ def write_picosvg_builds(
     picosvg_builds: Set[Path],
     nw: NinjaWriter,
     clipped: bool,
-    reuse_tolerance: float,
     master: MasterConfig,
 ):
     rule_name = "picosvg_unclipped"
@@ -362,13 +350,6 @@ def write_picosvg_builds(
         picosvg_builds.add(svg_file)
         nw.build(dest, rule_name, rel_build(svg_file))
 
-        nw.build(
-            part_file_dest(dest),
-            "write_part_file",
-            dest,
-            variables={"reuse_tolerance": reuse_tolerance},
-        )
-
 
 def write_bitmap_builds(
     bitmap_builds: Set[Path],
@@ -642,11 +623,7 @@ def _run(argv):
                 for master in font_config.masters:
                     if font_config.has_picosvgs:
                         write_picosvg_builds(
-                            picosvg_builds,
-                            nw,
-                            font_config.clip_to_viewbox,
-                            font_config.reuse_tolerance,
-                            master,
+                            picosvg_builds, nw, font_config.clip_to_viewbox, master
                         )
             nw.newline()