chore: use a pre-commit hook to set a .version file instead of using git

This ensures that the flake, go get and goreleaser deployments all have the same version number,
since the version number will come from the git repo instead.

.goreleaser.yaml

@@ -2,8 +2,11 @@ builds:
   - env:
       - CGO_ENABLED=0
     dir: cmd/templ
+    mod_timestamp: '{{ .CommitTimestamp }}'
+    flags:
+      - -trimpath
     ldflags:
-      - -s -w -X github.com/a-h/templ.Version={{.Version}}
+      - -s -w
     goos:
       - linux
       - windows

.version

@@ -0,0 +1 @@
+0.2.418-next

generator/.version

@@ -0,0 +1 @@
+0.2.418-next

generator/generator.go

@@ -7,9 +7,10 @@ import (
 	"html"
 	"io"
 	"reflect"
-	"runtime/debug"
 	"strings"
 
+	_ "embed"
+
 	"github.com/a-h/templ/parser/v2"
 )
 
@@ -48,28 +49,11 @@ func (g *generator) generate() (err error) {
 	return err
 }
 
-// Binary builds set this version string. goreleaser sets the value using Go build ldflags.
+//go:embed .version
 var version string
 
-// Source builds use this value. When installed using `go install github.com/a-h/templ/cmd/templ@latest` the `version` variable is empty, but
-// the debug.ReadBuildInfo return value provides the package version number installed by `go install`
-func goInstallVersion() string {
-	info, ok := debug.ReadBuildInfo()
-	if !ok {
-		return "unknown"
-	}
-	return info.Main.Version
-}
-
-func getVersion() string {
-	if version != "" {
-		return version
-	}
-	return goInstallVersion()
-}
-
 func (g *generator) writeCodeGeneratedComment() error {
-	_, err := g.w.Write(fmt.Sprintf("// Code generated by templ@%s DO NOT EDIT.\n\n", getVersion()))
+	_, err := g.w.Write(fmt.Sprintf("// Code generated by templ@%s DO NOT EDIT.\n\n", version))
 	return err
 }
 

increment-version/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os/exec"
+	"strings"
+)
+
+var fileFlag = flag.String("file", ".version", "Set the name of the file to modify")
+
+func main() {
+	gitPath, err := exec.LookPath("git")
+	if err != nil {
+		log.Fatalf("failed to find git on path: %v", err)
+	}
+
+	cmd := exec.Command(gitPath, "rev-list", "main", "--count")
+	output, err := cmd.Output()
+	if err != nil {
+		log.Fatalf("failed to run git: %v", err)
+	}
+	count := strings.TrimSpace(string(output))
+
+	var dirty string
+	cmd = exec.Command(gitPath, "diff", "--quiet")
+	if cmd.Run() != nil {
+		dirty = "-next"
+	}
+
+	fmt.Printf("0.2.%s%s", count, dirty)
+}

push-tag.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-export VERSION=`git rev-list --count HEAD`; 
-echo Adding git tag with version v0.2.${VERSION};
-git tag v0.2.${VERSION};
-git push origin v0.2.${VERSION};
+export VERSION=`cat .version`
+echo Adding git tag with version v${VERSION};
+git tag v${VERSION};
+git push origin v${VERSION};

version.go

@@ -1,4 +1,6 @@
 package templ
 
-// Binary builds set this version string. goreleaser sets the value using Go build ldflags.
+import _ "embed"
+
+//go:embed .version
 var Version string