Set environment variables for the exec command

commands/exec.go

@@ -3,6 +3,7 @@ package commands
 import (
 	"errors"
 	"fmt"
+	"os"
 	"os/exec"
 	"time"
 
@@ -29,7 +30,22 @@ func (ExecCmd) Execute(aerc *widgets.Aerc, args []string) error {
 	if len(args) < 2 {
 		return errors.New("Usage: exec [cmd...]")
 	}
+
 	cmd := exec.Command(args[1], args[2:]...)
+	env := os.Environ()
+
+	switch view := aerc.SelectedTab().(type) {
+	case *widgets.AccountView:
+		env = append(env, fmt.Sprintf("account=%s", view.AccountConfig().Name))
+		env = append(env, fmt.Sprintf("folder=%s", view.Directories().Selected()))
+	case *widgets.MessageViewer:
+		acct := view.SelectedAccount()
+		env = append(env, fmt.Sprintf("account=%s", acct.AccountConfig().Name))
+		env = append(env, fmt.Sprintf("folder=%s", acct.Directories().Selected()))
+	}
+
+	cmd.Env = env
+
 	go func() {
 		err := cmd.Run()
 		if err != nil {

doc/aerc.1.scd

@@ -47,7 +47,9 @@ These commands work in any context.
 	as a delta from the selected tab.
 
 *exec* <command...>
-	Executes an arbitrary command in the background.
+	Executes an arbitrary command in the background. Aerc will set the 
+	environement variables *$account* and *$folder* when the command is
+	executed from an Account tab or an opened message.
 
 	*Note*: commands executed in this way are not executed with the shell.