From fe9ebf0babf558edbbefe31f6ce9dd053f9df40b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mike=20Schw=C3=B6rer?= <pubgit@mikescher.com>
Date: Wed, 7 Jun 2023 12:36:41 +0200
Subject: [PATCH] v0.0.143

---
 _data/version.sh           |  2 ++
 bfcodegen/enum-generate.go | 43 +++++++++++++++++++++++++++++++++++---
 goextVersion.go            |  5 +++++
 3 files changed, 47 insertions(+), 3 deletions(-)
 create mode 100644 goextVersion.go

diff --git a/_data/version.sh b/_data/version.sh
index 9af447c..18874e7 100755
--- a/_data/version.sh
+++ b/_data/version.sh
@@ -32,6 +32,8 @@ echo "> Current Version: ${curr_vers}"
 echo "> Next    Version: ${next_ver}"
 echo ""
 
+printf "package goext\n\nconst GoextVersion = \"%s\"\n\nconst GoextVersionTimestamp = \"%s\"\n" "${next_ver}" "$( date +"%Y-%m-%dT%H:%M:%S%z" )" > "goextVersion.go"
+
 git add --verbose .
 
 msg="v${next_ver}"
diff --git a/bfcodegen/enum-generate.go b/bfcodegen/enum-generate.go
index 109b63a..bcb42ef 100644
--- a/bfcodegen/enum-generate.go
+++ b/bfcodegen/enum-generate.go
@@ -3,7 +3,9 @@ package bfcodegen
 import (
 	"errors"
 	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext"
 	"gogs.mikescher.com/BlackForestBytes/goext/cmdext"
+	"gogs.mikescher.com/BlackForestBytes/goext/cryptext"
 	"gogs.mikescher.com/BlackForestBytes/goext/langext"
 	"gogs.mikescher.com/BlackForestBytes/goext/rext"
 	"io"
@@ -32,6 +34,8 @@ var rexEnumDef = rext.W(regexp.MustCompile("^\\s*type\\s+(?P<name>[A-Za-z0-9_]+)
 
 var rexValueDef = rext.W(regexp.MustCompile("^\\s*(?P<name>[A-Za-z0-9_]+)\\s+(?P<type>[A-Za-z0-9_]+)\\s*=\\s*(?P<value>(\"[A-Za-z0-9_:]+\"|[0-9]+))\\s*(//(?P<descr>.*))?.*$"))
 
+var rexChecksumConst = rext.W(regexp.MustCompile("const ChecksumGenerator = \"(?P<cs>[A-Za-z0-9_]*)\""))
+
 func GenerateEnumSpecs(sourceDir string, destFile string) error {
 
 	files, err := os.ReadDir(sourceDir)
@@ -39,6 +43,36 @@ func GenerateEnumSpecs(sourceDir string, destFile string) error {
 		return err
 	}
 
+	oldChecksum := "N/A"
+	if _, err := os.Stat(destFile); !os.IsNotExist(err) {
+		content, err := os.ReadFile(destFile)
+		if err != nil {
+			return err
+		}
+		if m, ok := rexChecksumConst.MatchFirst(string(content)); ok {
+			oldChecksum = m.GroupByName("cs").Value()
+		}
+	}
+
+	newChecksumStr := goext.GoextVersion
+	langext.SortBy(files, func(v os.DirEntry) string { return v.Name() })
+	for _, f := range files {
+		content, err := os.ReadFile(destFile)
+		if err != nil {
+			return err
+		}
+		newChecksumStr += "\n" + f.Name() + "\t" + cryptext.BytesSha256(content)
+	}
+
+	newChecksum := cryptext.BytesSha256([]byte(newChecksumStr))
+
+	if newChecksum != oldChecksum {
+		fmt.Printf("[EnumGenerate] Checksum has changed ( %s -> %s ), will generate new file\n\n", oldChecksum, newChecksum)
+	} else {
+		fmt.Printf("[EnumGenerate] Checksum unchanged ( %s ), nothing to do\n", oldChecksum)
+		return nil
+	}
+
 	allEnums := make([]EnumDef, 0)
 
 	pkgname := ""
@@ -67,7 +101,7 @@ func GenerateEnumSpecs(sourceDir string, destFile string) error {
 		return errors.New("no package name found in any file")
 	}
 
-	err = os.WriteFile(destFile, []byte(fmtOutput(allEnums, pkgname)), 0o755)
+	err = os.WriteFile(destFile, []byte(fmtOutput(newChecksum, allEnums, pkgname)), 0o755)
 	if err != nil {
 		return err
 	}
@@ -159,8 +193,8 @@ func processFile(fn string) ([]EnumDef, string, error) {
 	return enums, pkgname, nil
 }
 
-func fmtOutput(enums []EnumDef, pkgname string) string {
-	str := "// Code generated by permissions_gen.sh DO NOT EDIT.\n"
+func fmtOutput(cs string, enums []EnumDef, pkgname string) string {
+	str := "// Code generated by enum-generate.go DO NOT EDIT.\n"
 	str += "\n"
 	str += "package " + pkgname + "\n"
 	str += "\n"
@@ -168,6 +202,9 @@ func fmtOutput(enums []EnumDef, pkgname string) string {
 	str += "import \"gogs.mikescher.com/BlackForestBytes/goext/langext\"" + "\n"
 	str += "\n"
 
+	str += "const ChecksumGenerator = \"" + cs + "\"" + "\n"
+	str += "\n"
+
 	str += "type Enum interface {" + "\n"
 	str += "    Valid() bool" + "\n"
 	str += "    ValuesAny() []any" + "\n"
diff --git a/goextVersion.go b/goextVersion.go
new file mode 100644
index 0000000..f27cd32
--- /dev/null
+++ b/goextVersion.go
@@ -0,0 +1,5 @@
+package goext
+
+const GoextVersion = "0.0.143"
+
+const GoextVersionTimestamp = "2023-06-07T12:36:41+0200"