init

LICENSE

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+MIT License
+Copyright (c) 2018 Stephen McQuay
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# ipsort
+
+Numerically sort lines containing ip addresses.

main.go

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+// command svsort sorts lines of text by semver at beginning of line
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"sort"
+)
+
+type lines []string
+
+func (l lines) Len() int      { return len(l) }
+func (l lines) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
+func (l lines) Less(i, j int) bool {
+	a, b := net.ParseIP(l[i]), net.ParseIP(l[j])
+	return bytes.Compare(a, b) < 0
+}
+
+func main() {
+	s := bufio.NewScanner(os.Stdin)
+
+	ls := lines{}
+	for s.Scan() {
+		ls = append(ls, s.Text())
+	}
+
+	if err := s.Err(); err != nil {
+		log.Fatalf("scan: %v")
+	}
+
+	sort.Sort(ls)
+	for _, l := range ls {
+		fmt.Printf("%v\n", l)
+	}
+}