show version

README.md

@@ -0,0 +1,69 @@
+# loadenv
+
+Loads environment files before running a command without polluting your environment
+
+## Source code
+
+You can find the source code here: [git.milar.in](https://git.milar.in/milarin/loadenv)
+
+## Installation
+
+If you have Go installed, you can simply go install the program: `go install git.milar.in/milarin/loadenv@latest`
+
+There are pre-compiled executables for various platforms on the [repository](https://git.milar.in/milarin/loadenv/releases).
+
+## License
+
+Distributed under the MIT License. See [LICENSE.md](https://git.milar.in/milarin/loadenv/src/branch/main/LICENSE.md)
+
+## Usage
+
+`loadenv` loads the environment file provided via `-f` into the environment and runs the command provided after the arguments.
+If no file is provided, `.env` is used by default.
+If no command is provided, `loadenv` prints all environment variables to stdout.
+
+---
+
+The variables will only be available to the given command. They will be deleted after the command exits.
+`loadenv` can be useful when working with programs which heavily use environment variables.
+
+```sh
+$ cat .env
+# production server configuration
+DATABASE_HOST=prod-server.com
+DATABASE_USER=milarin
+DATABASE_PASS=my-super-secure-password
+
+$ # show the 3 last added env variables
+$ loadenv | tail -n 3
+DATABASE_HOST=prod-server.com
+DATABASE_USER=milarin
+DATABASE_PASS=my-super-secure-password
+
+$ cat dev.env
+# development server configuration
+DATABASE_HOST=dev-server.com
+DATABASE_USER=milarin
+DATABASE_PASS=my-super-secure-password
+
+$ # load dev.env into environment and run the command env. show last 3 lines
+$ loadenv -f dev.env env | tail -n 3
+DATABASE_HOST=dev-server.com
+DATABASE_USER=milarin
+DATABASE_PASS=my-super-secure-password
+```
+
+environment variables in that file will be expanded:
+
+```sh
+$ env | grep USER # current value of $USER
+USER=milarin
+
+$ cat .env
+# expand $USER reference
+USERNAME=$USER
+
+$ loadenv | tail -n 1
+USERNAME=milarin
+```
+

go.mod

@@ -1,3 +1,5 @@
 module git.milar.in/milarin/loadenv
 
 go 1.18
+
+require git.milar.in/milarin/buildinfo v1.0.0

go.sum

@@ -0,0 +1,2 @@
+git.milar.in/milarin/buildinfo v1.0.0 h1:tw98GupUYl/0a/3aPGuezhE4wseycOSsbcLp70hy60U=
+git.milar.in/milarin/buildinfo v1.0.0/go.mod h1:arI9ZoENOgcZcanv25k9y4dKDUhPp0buJrlVerGruas=

main.go

@@ -8,6 +8,8 @@ import (
 	"os"
 	"os/exec"
 	"regexp"
+
+	"git.milar.in/milarin/buildinfo"
 )
 
 var (
@@ -15,11 +17,18 @@ var (
 
 	EnvVarRegex     = regexp.MustCompile(`^(.*?)=(.*?)$`)
 	EnvCommentRegex = regexp.MustCompile(`^[ \t]*#.*?$`)
+
+	ShowVersion = flag.Bool("v", false, "show version and exit")
 )
 
 func main() {
 	flag.Parse()
 
+	if *ShowVersion {
+		buildinfo.Print(buildinfo.Options{})
+		return
+	}
+
 	envFile, err := os.Open(*EnvFilePath)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "could not open file '%s': %s\n", *EnvFilePath, err.(*os.PathError).Err)