Initial commit

I can parse some of the data files, and extract individual frames from .obj
files. I can't yet convert those frames into something viewable.

internal/data/accounting.go

@@ -0,0 +1,52 @@
+package data
+
+import (
+	"bytes"
+	"errors"
+)
+
+// Comments are `//`, start of line only, for accounting
+var (
+	comment = []byte("//")
+)
+
+type Accounting map[string]string
+
+func LoadAccounting(filename string) (Accounting, error) {
+	scanLines, err := fileToScanner(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	out := make(Accounting)
+
+	for scanLines.Scan() {
+		if err := parse(out, scanLines.Bytes()); err != nil {
+			return nil, err
+		}
+	}
+
+	if err := scanLines.Err(); err != nil {
+		return nil, err
+	}
+
+	return out, nil
+}
+
+func parse(into Accounting, line []byte) error {
+	if len(line) == 0 || bytes.Equal(line[0:2], comment) {
+		return nil
+	}
+
+	idx := bytes.Index(line, []byte("="))
+	key := string(line[0:idx])
+	value := string(bytes.Trim(line[idx+1:len(line)], "\t\r\n"))
+
+	if _, ok := into[key]; ok {
+		return errors.New("Duplicate key: " + key)
+	}
+
+	into[key] = value
+
+	return nil
+}