From 20f84c6bf1c11b420a59a7450d506bdf3a848036 Mon Sep 17 00:00:00 2001
From: Timon Ringwald <timon.ringwald@mequen.de>
Date: Tue, 30 Aug 2022 00:42:47 +0200
Subject: [PATCH] print go install command by default

---
 compile.go  |  2 +-
 main.go     | 19 ++++++++++++++++---
 metadata.go | 22 ++++++++++++----------
 3 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/compile.go b/compile.go
index 4500071..f15938d 100644
--- a/compile.go
+++ b/compile.go
@@ -35,7 +35,7 @@ func Compile(cfg *CompileConfig, ch chan<- *CompileReport, wg *sync.WaitGroup) {
 
 	ch <- &CompileReport{Config: cfg, State: StateCompiling}
 
-	args := []string{"build", "-o", filePath, BuildLdFlags(cfg.OS, cfg.Arch)}
+	args := []string{"build", "-o", filePath, "-ldflags=" + BuildLdFlags(cfg.OS, cfg.Arch)}
 
 	compileCmd := exec.Command("go", args...)
 	compileCmd.Dir = ModulePath
diff --git a/main.go b/main.go
index 98d1d74..e2f8d04 100644
--- a/main.go
+++ b/main.go
@@ -20,7 +20,9 @@ import (
 var (
 	OutputFileTmpl = template.New("output-file")
 
-	ModulePath  string
+	ModulePath string
+
+	ProjectPath string
 	ProjectName string
 
 	// meta data for executables
@@ -62,6 +64,8 @@ var (
 	IgnoreConfigFile = flag.Bool("ignoreconfig", false, "dont read any config file")
 	FindConfigFile   = flag.Bool("findconfig", false, "print config file path and exit")
 
+	DontPrintInstallCmd = flag.Bool("p", false, "print 'go install' command")
+
 	ShowVersion = flag.Bool("v", false, "show version and exit")
 )
 
@@ -69,6 +73,15 @@ func main() {
 	Init()
 	GatherMetaData()
 
+	if !*Silent && !*DontPrintInstallCmd {
+		tag := VersionTag
+		if tag == "" || strings.HasPrefix(tag, "(devel") {
+			tag = "latest"
+		}
+		Println(ColorDone.Sprintf("go install -ldflags=\"%s\" %s@%s", BuildLdFlags("", ""), ProjectPath, tag))
+		Println()
+	}
+
 	ch := make(chan *CompileReport, len(CompileConfigs))
 	wg := new(sync.WaitGroup)
 
@@ -105,8 +118,8 @@ func DetermineProjectName() error {
 
 	for _, line := range strings.Split(string(data), "\n") {
 		if strings.HasPrefix(line, "module ") {
-			fullName := strings.TrimPrefix(line, "module ")
-			parts := strings.Split(fullName, "/")
+			ProjectPath = strings.TrimPrefix(line, "module ")
+			parts := strings.Split(ProjectPath, "/")
 			ProjectName = parts[len(parts)-1]
 			return nil
 		}
diff --git a/metadata.go b/metadata.go
index 47d4dfb..9f364cf 100644
--- a/metadata.go
+++ b/metadata.go
@@ -119,8 +119,6 @@ func GatherMetaData() {
 func BuildLdFlags(os, arch string) string {
 	b := &strings.Builder{}
 
-	b.WriteString("-ldflags=")
-
 	if !*KeepDebugFlags {
 		b.WriteString("-s -w")
 	}
@@ -149,15 +147,19 @@ func BuildLdFlags(os, arch string) string {
 	b.WriteString("=")
 	b.WriteString(BuildTime)
 
-	b.WriteString(" -X ")
-	b.WriteString("git.milar.in/milarin/buildinfo.OS")
-	b.WriteString("=")
-	b.WriteString(os)
+	if os != "" {
+		b.WriteString(" -X ")
+		b.WriteString("git.milar.in/milarin/buildinfo.OS")
+		b.WriteString("=")
+		b.WriteString(os)
+	}
 
-	b.WriteString(" -X ")
-	b.WriteString("git.milar.in/milarin/buildinfo.Arch")
-	b.WriteString("=")
-	b.WriteString(arch)
+	if arch != "" {
+		b.WriteString(" -X ")
+		b.WriteString("git.milar.in/milarin/buildinfo.Arch")
+		b.WriteString("=")
+		b.WriteString(arch)
+	}
 
 	return b.String()
 }