Start embedding a version number

Author: fileformat

bin/build.sh

@@ -20,14 +20,22 @@ if [ ! -d "${DIST_DIR}" ]; then
 fi
 
 FILES=$(ls "${REPO_DIR}/cmd")
+LASTMOD=$(date -u +%Y-%m-%dT%H:%M:%SZ)
+COMMIT=$(git rev-parse --short HEAD)
+if [[ $(git diff --stat) != '' ]]; then
+	COMMIT="${COMMIT}-dirty"
+fi
 
 for f in $FILES; do
 	if [ -f "${DIST_DIR}/${f}" ]; then
 		echo "WARNING: file ${DIST_DIR}/${f} already exists"
 		continue
 	fi
 	echo "INFO: compiling ${f} to dist directory"
-	go build -o "${DIST_DIR}/${f}" "${REPO_DIR}/cmd/${f}"
+	go build \
+		-ldflags "-s -w -X github.com/FileFormatInfo/fftools/internal.LASTMOD=${LASTMOD} -X github.com/FileFormatInfo/fftools/internal.COMMIT=${COMMIT} -X github.com/FileFormatInfo/fftools/internal.BUILDER=build.sh" \
+		-o "${DIST_DIR}/${f}" \
+		"${REPO_DIR}/cmd/${f}"
 done
 
 echo "INFO: complete at $(date -u +%Y-%m-%dT%H:%M:%SZ)"

cmd/uniwhat/uniwhat.go

@@ -7,6 +7,7 @@ import (
 	"log"
 	"os"
 
+	"github.com/FileFormatInfo/fftools/internal"
 	"github.com/spf13/pflag"
 	"golang.org/x/text/unicode/runenames"
 )
@@ -18,9 +19,15 @@ func main() {
 	var codepoint = pflag.Bool("codepoint", true, "Print the U+XXXX codepoint")
 	var offset = pflag.Bool("offset", true, "Print the offset")
 	var char = pflag.Bool("char", false, "Print the character itself")
+	var version = pflag.Bool("version", false, "Print version information")
 
 	pflag.Parse()
 
+	if *version {
+		internal.PrintVersion("uniwhat")
+		return
+	}
+
 	args := pflag.Args()
 	if len(args) == 0 {
 		args = []string{"-"}

internal/Version.go

@@ -0,0 +1,21 @@
+package internal
+
+import (
+	"fmt"
+	"log/slog"
+)
+
+var (
+	BUILDER = "unknown"
+	COMMIT  = "(local)"
+	LASTMOD = "(local)"
+	VERSION = "internal"
+)
+
+func PrintVersion(name string) {
+	if LogLevel >= slog.LevelInfo {
+		slog.Info("Version information", "name", name, "version", VERSION, "lastmod", LASTMOD, "commit", COMMIT, "builder", BUILDER)
+	} else {
+		fmt.Printf("%s version %s (built on %s from %s by %s)\n", name, VERSION, LASTMOD, COMMIT, BUILDER)
+	}
+}