add utils cmd

Author: leopoldxx

utils/join/cmd/join.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		return
+	}
+	bar := os.Args[1]
+	raw := os.Args[2:]
+	for i := range raw {
+		raw[i] = fmt.Sprintf("%s%s%s", bar, raw[i], bar)
+	}
+	fmt.Println(strings.Join(raw, ","))
+}

utils/rotate/cmd/rotate.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/leopoldxx/go-utils/utils/rotate"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		return
+	}
+
+	raw := os.Args[1:]
+	for i := range raw {
+		fmt.Println(rotate.Rotate(raw[i], "."))
+	}
+}

utils/rotate/rotate.go

@@ -0,0 +1,13 @@
+package rotate
+
+import "strings"
+
+// Rotate string by a sep
+func Rotate(raw, sep string) string {
+	items := strings.Split(raw, sep)
+
+	for i := 0; i < (len(items)+1)/2; i++ {
+		items[i], items[len(items)-1-i] = items[len(items)-1-i], items[i]
+	}
+	return strings.Join(items, sep)
+}

utils/rotate/rotate_test.go

@@ -0,0 +1,35 @@
+package rotate
+
+import "testing"
+
+func TestRotate(t *testing.T) {
+
+	testCases := []struct {
+		raw    string
+		sep    string
+		expect string
+	}{
+		{
+			raw:    "ab.cd.e.fg",
+			sep:    ".",
+			expect: "fg.e.cd.ab",
+		},
+		{
+			raw:    "a.b.c.d.e.f.g",
+			sep:    "...",
+			expect: "a.b.c.d.e.f.g",
+		},
+		{
+			raw:    "ab.cd.ef.g",
+			sep:    "",
+			expect: "g.fe.dc.ba",
+		},
+	}
+
+	for _, tc := range testCases {
+		if Rotate(tc.raw, tc.sep) != tc.expect {
+			t.Fatalf("rotate failed: %v", tc)
+		}
+	}
+
+}