Re-org so I can do more.

data.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+  "os"
+  "encoding/json"
+  "log"
+)
+
+
+type Conversion struct {
+  PixelWidth int
+  ColorDepth int
+  DitherType int
+  Width int
+  Height int
+}
+
+type Settings struct {
+  Source string
+  Target string
+  Base Conversion
+  Exceptions map[string]Conversion
+}
+
+func LoadSettings(path string) Settings {
+  var settings Settings
+
+  config, err := os.ReadFile(path)
+  if err != nil {
+      log.Fatalf("invalid config path: %s", path)
+  }
+
+  err = json.Unmarshal(config, &settings)
+  if err != nil {
+      log.Fatalf("json format error:", err)
+  }
+
+  return settings
+}

main.go

@@ -1,76 +1,14 @@
 package main
 
 import (
-  "os"
-  "image"
-  "encoding/json"
-  "log"
-  "image/png"
-  "github.com/disintegration/gift"
   "flag"
-  "lcthw.dev/go/jankifier/filters"
 )
 
-func LoadImage(filename string) image.Image {
-  reader, err := os.Open(filename)
-  if err != nil { log.Fatal(err) }
-  defer reader.Close()
-
-  img, _, err := image.Decode(reader)
-  if err != nil { log.Fatal(err) }
-
-  return img
-}
-
-func SaveImage(filename string, img image.Image) {
-  out, err := os.Create(filename)
-  if err != nil {
-    log.Fatalf("can't write file %s: %v", filename, err)
-  }
-  defer out.Close()
-
-  err = png.Encode(out, img)
-  if err != nil {
-    log.Fatalf("can't png encode %s: %v", filename, err)
-  }
-}
-
 type Opts struct {
-  Config string
+Config string
   Force bool
 }
 
-type Conversion struct {
-  PixelWidth int
-  ColorDepth int
-  DitherType int
-  Width int
-  Height int
-}
-
-type Settings struct {
-  Source string
-  Target string
-  Base Conversion
-  Exceptions map[string]Conversion
-}
-
-func LoadSettings(path string) Settings {
-  var settings Settings
-
-  config, err := os.ReadFile(path)
-  if err != nil {
-      log.Fatalf("invalid config path: %s", path)
-  }
-
-  err = json.Unmarshal(config, &settings)
-  if err != nil {
-      log.Fatalf("json format error:", err)
-  }
-
-  return settings
-}
-
 func ParseOpts() Opts {
   var opts Opts
 
@@ -81,22 +19,6 @@ func ParseOpts() Opts {
   return opts
 }
 
-func JankImage(settings Conversion, in_file string, out_file string) {
-  src := LoadImage(in_file)
-  bounds := src.Bounds()
-
-  resize := gift.Resize(bounds.Max.X / settings.PixelWidth, 0, gift.NearestNeighborResampling)
-  posterize := filters.Posterize(uint16(settings.ColorDepth), settings.DitherType)
-  upscale := filters.Upscale(bounds, settings.PixelWidth)
-  sharpen := gift.UnsharpMask(1, 1, 0)
-
-  g := gift.New(resize, posterize, upscale, sharpen)
-  out_img := image.NewNRGBA(g.Bounds(bounds))
-  g.Draw(out_img, src)
-
-  SaveImage(out_file, out_img)
-}
-
 func main() {
   opts := ParseOpts()
   settings := LoadSettings(opts.Config)

processing.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+  "os"
+  "image"
+  "log"
+  "image/png"
+  "github.com/disintegration/gift"
+  "lcthw.dev/go/jankifier/filters"
+)
+
+func LoadImage(filename string) image.Image {
+  reader, err := os.Open(filename)
+  if err != nil { log.Fatal(err) }
+  defer reader.Close()
+
+  img, _, err := image.Decode(reader)
+  if err != nil { log.Fatal(err) }
+
+  return img
+}
+
+func SaveImage(filename string, img image.Image) {
+  out, err := os.Create(filename)
+  if err != nil {
+    log.Fatalf("can't write file %s: %v", filename, err)
+  }
+  defer out.Close()
+
+  err = png.Encode(out, img)
+  if err != nil {
+    log.Fatalf("can't png encode %s: %v", filename, err)
+  }
+}
+
+func JankImage(settings Conversion, in_file string, out_file string) {
+  src := LoadImage(in_file)
+  bounds := src.Bounds()
+
+  resize := gift.Resize(bounds.Max.X / settings.PixelWidth, 0, gift.NearestNeighborResampling)
+  posterize := filters.Posterize(uint16(settings.ColorDepth), settings.DitherType)
+  upscale := filters.Upscale(bounds, settings.PixelWidth)
+  sharpen := gift.UnsharpMask(1, 1, 0)
+
+  g := gift.New(resize, posterize, upscale, sharpen)
+  out_img := image.NewNRGBA(g.Bounds(bounds))
+  g.Draw(out_img, src)
+
+  SaveImage(out_file, out_img)
+}