first commit status: option and argument parsing, short aliases grouping, special values, hidden options

Option types: bool int, int-array, string, string-array, string-map, file, dir

cli-version.go

@@ -0,0 +1,59 @@
+package cli
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+// const (
+// 	VER_PROGRAM = iota
+// 	VER_VERSION
+// 	VER_DATE
+// 	VER_EMAIL
+// )
+
+// GetVersionSection()
+func (cli *CliParser) GetVersionSection(sectionName string) (secValue string, err error) {
+	var sectionId int
+	if sectionName == "" || sectionName == "all" || sectionName == "full" {
+		secValue = cli.version[5 : len(cli.version)-2]
+	} else {
+		sections := strings.Split(cli.version[5:len(cli.version)-2], ",")
+		switch sectionName {
+		case "program":
+			sectionId = 0
+		case "version", "number":
+			sectionId = 1
+		case "date":
+			sectionId = 2
+		case "email":
+			sectionId = 3
+		case "full":
+			sectionId = -1
+		default:
+			sectionId = 1
+		}
+		if sectionId >= 0 && sectionId < len(sections) {
+			secValue = sections[sectionId]
+		} else {
+			err = fmt.Errorf("unknown version section %q", sectionName)
+		}
+	}
+	return
+}
+
+// PrintVersion()
+func (cli *CliParser) PrintVersion(specs []string) {
+	if len(specs) == 0 {
+		if specValue, err := cli.GetVersionSection("number"); err == nil {
+			os.Stdout.WriteString(specValue + "\n")
+		}
+	} else {
+		for _, spec := range specs {
+			if specValue, err := cli.GetVersionSection(spec); err == nil {
+				os.Stdout.WriteString(specValue + "\n")
+			}
+		}
+	}
+}