Initial version

.gitignore

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+vercmp

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+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 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.
+
+For more information, please refer to <https://unlicense.org>
+

README.md

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+[![Go Report Card](https://goreportcard.com/badge/github.com/Luzifer/vercmp)](https://goreportcard.com/report/github.com/Luzifer/vercmp)
+![](https://badges.fyi/github/license/Luzifer/vercmp)
+![](https://badges.fyi/github/downloads/Luzifer/vercmp)
+![](https://badges.fyi/github/latest-release/Luzifer/vercmp)
+![](https://knut.in/project-status/vercmp)
+
+# Luzifer / vercmp
+
+`vercmp` resembles [`vercmp`](https://www.archlinux.org/pacman/vercmp.8.html) utility from [Archlinux](https://www.archlinux.org/) with two small differences: It runs on systems without `libalpm.so` and it strictly uses [SemVer](https://semver.org/) - otherwise it should be fully interchangeable.
+
+## Usage
+
+```console
+# vercmp
+
+Compare version numbers using SemVer version logic
+
+Usage: vercmp <ver1> <ver2>
+
+Output values:
+  < 0 : if ver1 < ver2
+    0 : if ver1 == ver2
+  > 0 : if ver1 > ver2
+
+# vercmp 7.6.0 7.4.1
+1
+```

go.mod

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+module github.com/Luzifer/vercmp
+
+go 1.14
+
+require (
+	github.com/Luzifer/rconfig/v2 v2.2.1
+	github.com/blang/semver/v4 v4.0.0
+)

go.sum

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+github.com/Luzifer/rconfig/v2 v2.2.1 h1:zcDdLQlnlzwcBJ8E0WFzOkQE1pCMn3EbX0dFYkeTczg=
+github.com/Luzifer/rconfig/v2 v2.2.1/go.mod h1:OKIX0/JRZrPJ/ZXXWklQEFXA6tBfWaljZbW37w+sqBw=
+github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=
+github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
+github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
+github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19 h1:WB265cn5OpO+hK3pikC9hpP1zI/KTwmyMFKloW9eOVc=
+gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19/go.mod h1:o4V0GXN9/CAmCsvJ0oXYZvrZOe7syiDZSN1GWGZTGzc=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

main.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/blang/semver/v4"
+
+	"github.com/Luzifer/rconfig/v2"
+)
+
+const usage = `
+Compare version numbers using SemVer version logic
+
+Usage: vercmp <ver1> <ver2>
+
+Output values:
+  < 0 : if ver1 < ver2
+    0 : if ver1 == ver2
+  > 0 : if ver1 > ver2
+`
+
+var (
+	cfg = struct {
+		VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
+	}{}
+
+	version = "dev"
+)
+
+func init() {
+	if err := rconfig.ParseAndValidate(&cfg); err != nil {
+		log.Fatalf("Unable to parse commandline options: %s", err)
+	}
+
+	if cfg.VersionAndExit {
+		fmt.Printf("vercmp %s\n", version)
+		os.Exit(0)
+	}
+}
+
+func main() {
+	if len(rconfig.Args()) != 3 {
+		fmt.Println(usage)
+		os.Exit(2)
+	}
+
+	ver1, err := semver.Make(rconfig.Args()[1])
+	if err != nil {
+		log.Fatalf("Unable to parse ver1: %s", err)
+	}
+
+	ver2, err := semver.Make(rconfig.Args()[2])
+	if err != nil {
+		log.Fatalf("Unable to parse ver2: %s", err)
+	}
+
+	fmt.Println(ver1.Compare(ver2))
+}