1 files changed, 93 insertions, 0 deletions
diff --git a/compressor.go b/compressor.go
new file mode 100644
index 0000000..a3a16db
--- /dev/null
+++ b/compressor.go
@@ -0,0 +1,93 @@
+package main
+
+import (
+	"github.com/BurntSushi/toml"
+	"io/fs"
+	fp "path/filepath"
+	"strings"
+)
+
+const root = "compressor_maps/"
+
+type Compressor struct {
+	Name     string
+	FileName string
+	// MinX is the distance of the y-axis from left of image in pixels.
+	MinX int
+	// MinY is the distance of the x-axis from the top of the image in
+	//pixels.
+	MinY int
+	// MaxX is the distance of the end of the graph from the left of the
+	// image in pixels.
+	MaxX int
+	// MaxY is the distance of the top of the graph from the top of the
+	// image in pixels.
+	MaxY int
+	// MaxFlow is the mass flow rate at MaxX.
+	MaxFlow MassFlowRate
+	// MaxPR is the pressure ratio at MaxY.
+	MaxPR float32
+}
+
+// [manufacturer][series][model]
+var Compressors = make(map[string]map[string]map[string]Compressor)
+
+func init() {
+	// Walk root, looking for .toml files describing a compressor.
+	// Parse these toml files, create a Compressor and add it to Compressors.
+	err := fp.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if fp.Ext(path) != ".toml" {
+			return nil
+		}
+
+		path = path[len(root):]
+
+		// manufacturer/series, model
+		manSer, mod := fp.Split(path)
+		manSer = fp.Clean(manSer)         // Clean trailing slash
+		mod = mod[:len(mod)-len(".toml")] // Trim .toml extension
+		// manufacturer, series
+		man, ser := fp.Split(manSer)
+		man = fp.Clean(man) // Clean trailing slash
+
+		if _, ok := Compressors[man]; !ok { // Manufacturer does NOT exist
+			Compressors[man] = make(map[string]map[string]Compressor)
+		}
+		if _, ok := Compressors[man][ser]; !ok { // Series does NOT exist
+			Compressors[man][ser] = make(map[string]Compressor)
+		}
+
+		tomlFile := fp.Join(root, path)
+		var c Compressor
+		if _, err = toml.DecodeFile(tomlFile, &c); err != nil {
+			return err
+		}
+		c.FileName = strings.TrimSuffix(tomlFile, ".toml") + ".jpg"
+		c.MaxFlow, err = readMaxFlow(tomlFile)
+		if err != nil {
+			return err
+		}
+		Compressors[man][ser][mod] = c
+		return nil
+	})
+	Check(err)
+}
+
+func readMaxFlow(tomlFile string) (MassFlowRate, error) {
+	flow := struct {
+		FlowVal  float32
+		FlowUnit string
+	}{}
+	if _, err := toml.DecodeFile(tomlFile, &flow); err != nil {
+		return -1, err
+	}
+	unit, err := ParseMassFlowRateUnit(flow.FlowUnit)
+	if err != nil {
+		return -1, err
+	}
+	return MassFlowRate(flow.FlowVal) * unit, nil
+}