add the first version of the utility

README.md

@@ -0,0 +1,47 @@
+## goprintenv
+
+A command line utility that displays the environment variables used by a Go project
+
+### Status
+
+The project is under development, it may not find all environment variables, keep this in mind when using it.
+
+```shell
+goprintenv -p <go-project-source>
+```
+
+### Install
+
+```shell
+go install github.com/robotomize/go-printenv/cmd/goprintenv@latest
+```
+
+### Example 
+
+Currently only processes env tags
+
+```go
+type Nested struct {
+    Live bool `env:"LIVE,default=true"`
+}
+
+type NestedStruct struct {
+	LastName string `env:"LAST_NAME,default=IVANOV" json:"last_name" bson:"lastName"`
+	Two      Nested `env:",prefix=TWO_"`
+}
+
+```
+
+The result will be the following
+
+```shell
+LAST_NAME=IVANOV
+TWO_LIVE=true
+```
+
+### @TODO
+* add ci, golangci-lint, Makefile, Dockerfile
+* Implement parsing of built-in structures
+* Should parse os.Getenv
+* Support more env tags
+* Refactor, simplify the code. Fix bugs and write unit tests

cmd/goprintenv/main.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"os"
+)
+
+func main() {
+	if err := rootCmd.Execute(); err != nil {
+		rootCmd.Println(err)
+		os.Exit(1)
+	}
+}

cmd/goprintenv/root.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"github.com/spf13/cobra"
+	"gituhb.com/robotomize/go-printenv/internal/analysis"
+	"gituhb.com/robotomize/go-printenv/internal/printer"
+)
+
+var (
+	verboseFlag   bool
+	goProjectPath string
+)
+
+func init() {
+	rootCmd.PersistentFlags().BoolVarP(
+		&verboseFlag,
+		"verbose",
+		"v",
+		false,
+		"more verbose",
+	)
+	rootCmd.PersistentFlags().StringVarP(
+		&goProjectPath,
+		"path",
+		"p",
+		".",
+		"go project path",
+	)
+}
+
+var rootCmd = &cobra.Command{
+	Use:  "goprintenv [-p project path -v verbose]",
+	Long: "Print env variables used in go project",
+	RunE: func(cmd *cobra.Command, args []string) error {
+
+		ctx := cmd.Context()
+		var printOpts []printer.Option
+
+		a := analysis.New(
+			goProjectPath, func(items ...analysis.OutputEntry) analysis.Printer {
+				return printer.New(items, printOpts...)
+			},
+		)
+
+		if _, err := cmd.OutOrStdout().Write(a.Print()); err != nil {
+			return err
+		}
+
+		_ = ctx
+
+		return nil
+	},
+}

go.mod

@@ -0,0 +1,15 @@
+module gituhb.com/robotomize/go-printenv
+
+go 1.19
+
+require (
+	github.com/spf13/cobra v1.6.1
+	golang.org/x/tools v0.6.0
+)
+
+require (
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/mod v0.8.0 // indirect
+	golang.org/x/sys v0.5.0 // indirect
+)

go.sum

@@ -0,0 +1,18 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.6.1 h1:o94oiPyS4KD1mPy2fmcYYHHfCxLqYjJOhGsCHFZtEzA=
+github.com/spf13/cobra v1.6.1/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+golang.org/x/mod v0.8.0 h1:LUYupSeNrTNCGzR/hVBk2NHZO4hXcVaW1k4Qx7rjPx8=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
+golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/tools v0.6.0 h1:BOw41kyTf3PuCW1pVQf8+Cyg8pMlkYB1oo9iJ6D/lKM=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=