Add version

.goreleaser.yaml

@@ -19,14 +19,10 @@ changelog:
 
 brews:
     -   name: unique
-        alternative_names:
-            - unique@{{ .Version }}
-            - unique@{{ .Major }}.{{ .Minor }}
-            - unique@{{ .Major }}
         description: "Outputs the unique lines of its input"
         homepage: "https://github.com/ro-tex/unique"
         license: "MIT"
-        folder: Formula
+        directory: Formula
         url_template: "https://github.com/ro-tex/unique/releases/download/{{ .Tag }}/{{ .ArtifactName }}"
         commit_author:
             name: goreleaserbot

.tool-versions

@@ -0,0 +1,2 @@
+golang 1.22.2
+goreleaser 1.25.1

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `--version` command that outputs version and commit hash.
+
 ### Changed
 
 - Switched to using v2 of xxhash library.

justfile

@@ -1,11 +1,17 @@
 # https://github.com/casey/just
 
+build:
+	goreleaser build --clean --snapshot
+
+buildWithVersion version commitHash:
+	go build -ldflags "-X main.version={{version}} -X main.commit={{commitHash}}" .
+
 release version:
 	@[[ "{{version}}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]] # ensure semantic versioning
 	@echo "Creating a release for version {{version}}:"
 	git tag -a {{version}} -m "{{version}}"
 	git push origin {{version}}
 	goreleaser release --clean
 
- sign-last-commit:
- 	git commit --amend --no-edit -S
+sign-last-commit:
+	git commit --amend --no-edit -S

main.go

@@ -22,6 +22,12 @@ const (
 	defaultLineLengthLimit = 100 * 1024 * 1024 // 100 MiB
 )
 
+var (
+	// These variables are set at build time by GoReleaser. See https://goreleaser.com/cookbooks/using-main.version/
+	version = "dev"
+	commit  = "none"
+)
+
 // readFile opens the given file for reading and returns a reader and a closing function.
 func readFile(path string, lineLimit int) (r *bufio.Reader, closeFn func() error, err error) {
 	if path == "" {
@@ -104,11 +110,19 @@ func main() {
 	var filePath string
 	var trim bool
 	var lineLengthLimit int
+	var versionFlag bool
 	flag.StringVar(&filePath, "f", "", "path to the file to process")
 	flag.BoolVar(&trim, "t", false, "trim whitespace from each line (default false)")
 	flag.IntVar(&lineLengthLimit, "ll", defaultLineLengthLimit, "limit the length of each line being processed, ignoring any data beyond that length (values under 16 are ignored)")
+	flag.BoolVar(&versionFlag, "version", false, "print the version")
 	flag.Parse()
 
+	// Print the version and exit.
+	if versionFlag {
+		fmt.Println(version, commit)
+		return
+	}
+
 	reader, closeFn, err := readFile(filePath, lineLengthLimit)
 	if err != nil {
 		log.Fatalf("Failed to read from file '%s'. Error: %s\n", filePath, err.Error())