Adds untested file write and read

files.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const (
+	Sheet   rune = 29
+	Row     rune = 30
+	Field   rune = 31
+	End     rune = 3
+)
+
+func WriteFile(path string) {
+	f, err := os.Create(path)
+	if err != nil {
+		panic(err.Error())
+	}
+	defer f.Close()
+	f.WriteString("tss")
+	for _, s := range wb.sheets {
+		writeSheet(f, s)
+	}
+	f.WriteString(string(End))
+}
+
+func writeSheet(f *os.File, sh sheet) {
+	var o strings.Builder
+	o.WriteRune(Sheet)
+
+	// Sheet header data
+	fmt.Fprintf(&o, "%s%c%d%c%d%c%d", sh.name, Field, sh.cols, Field, sh.rows, Field, sh.zoom)
+	for _, row := range sh.cells {
+		o.WriteRune(Row)
+		for c, cell := range row {
+			o.WriteString(cell.rawVal)
+			if c < len(row) - 1 {
+				o.WriteRune(Field)
+			}
+		}
+	}
+	f.WriteString(o.String())
+}
+
+func LoadFile(path string) {
+	fbytes, err := ioutil.ReadFile(path)
+	if err != nil {
+		fmt.Fprint(os.Stderr, "Unable to read file\n")
+		os.Exit(1)
+	}
+	f := string(fbytes)
+	if !strings.HasPrefix(f, "tss") || !strings.HasSuffix(f, string(End)) {
+		fmt.Fprint(os.Stderr, "Invalid file type\n")
+		os.Exit(1)
+	}
+	wb = makeWorkbook(path)
+	sheets := strings.Split(f[3:len(f)-1], string(Sheet))
+	for _, sh := range sheets {
+		rows := strings.Split(sh, string(Row))
+		s := makeSheet("")
+		for i, row := range rows {
+			fields := strings.Split(row, string(Field))
+			if i == 0 {
+				s.name = fields[0]
+				s.cols, _ = strconv.Atoi(fields[1])
+				s.rows, _ = strconv.Atoi(fields[2])
+				s.zoom, _ = strconv.Atoi(fields[3])
+				continue
+			}
+			s.cells = append(s.cells, make([]cell, 0, s.cols))
+			for _, field := range fields {
+				c := cell{}
+				c.Update(field)
+				s.cells[i-1] = append(s.cells[i-1], c)
+			}
+		}
+		s.Recalculate()
+		wb.sheets = append(wb.sheets, s)
+	}
+}