Align Go project structure and add Mage targets

Amp-Thread-ID: https://ampcode.com/threads/T-019c7f3b-1326-767b-94d5-366b91eaf712
Co-authored-by: Amp <amp@ampcode.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/Magefile.go b/Magefile.go
new file mode 100644
index 0000000..7f63a22
--- /dev/null
+++ b/Magefile.go
@@ -0,0 +1,52 @@
+//go:build mage
+
+// Magefile for ior targets: build, test, install.
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/magefile/mage/mg"
+	"github.com/magefile/mage/sh"
+)
+
+const binaryName = "ior"
+
+// Default builds the project.
+func Default() {
+	mg.Deps(Build)
+}
+
+// Build compiles the binary.
+func Build() error {
+	return sh.RunV("go", "build", "-o", binaryName, "./cmd/ior")
+}
+
+// Test runs the full test suite.
+func Test() error {
+	return sh.RunV("go", "test", "./...")
+}
+
+// Install copies the binary into GOPATH/bin.
+func Install() error {
+	mg.Deps(Build)
+
+	goPath := os.Getenv("GOPATH")
+	if goPath == "" {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return fmt.Errorf("resolve home directory: %w", err)
+		}
+		goPath = filepath.Join(home, "go")
+	}
+
+	binDir := filepath.Join(goPath, "bin")
+	if err := os.MkdirAll(binDir, 0o755); err != nil {
+		return fmt.Errorf("ensure %s: %w", binDir, err)
+	}
+
+	dest := filepath.Join(binDir, binaryName)
+	return sh.RunV("cp", "-v", binaryName, dest)
+}