init: generator framework

gen/scan.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path"
+	"strings"
+)
+
+var infhcache = make(map[string]string, 1024)
+
+func infh(name string) string {
+	if s, ok := infhcache[name]; ok {
+		return s
+	}
+	s := "  [" + name + "]"
+	infhcache[name] = s
+	return s
+}
+
+func scanheader(name string, scan *bufio.Scanner) {
+	ln := 0
+	var regionfile *os.File
+	for scan.Scan() {
+		ln++
+		t := scan.Text()
+		switch {
+		case strings.HasPrefix(t, "#pragma region "):
+			region := strings.TrimSpace(t[15:])
+			if region == "" {
+				panic(fmt.Sprintf("%s L%d: unexpected empty region", name, ln))
+			}
+			fmt.Println(infh(name), "scanning region", region)
+			f, err := os.Create(path.Join(name, region+".go"))
+			if err != nil {
+				panic(fmt.Sprintf("%s L%d: cannot create region %s, err: %v", name, ln, region, err))
+			}
+			f.WriteString("// Code generated by gen. DO NOT EDIT.\n\npackage ")
+			f.WriteString(name)
+			f.WriteString("\n")
+			regionfile = f
+		case strings.HasPrefix(t, "#pragma endregion"):
+			fmt.Println(infh(name), "close region", regionfile.Name())
+			_ = regionfile.Close()
+			regionfile = nil
+		}
+	}
+}