Use "open" instead of "xdg-open" on Darwin systems

commands/msgview/open.go

@@ -7,10 +7,10 @@ import (
 	"io/ioutil"
 	"mime/quotedprintable"
 	"os"
-	"os/exec"
 	"strings"
 	"time"
 
+	"git.sr.ht/~sircmpwn/aerc/lib"
 	"git.sr.ht/~sircmpwn/aerc/widgets"
 )
 
@@ -58,8 +58,7 @@ func (_ Open) Execute(aerc *widgets.Aerc, args []string) error {
 			return
 		}
 
-		cmd := exec.Command("xdg-open", tmpFile.Name())
-		err = cmd.Run()
+		err = lib.OpenFile(tmpFile.Name())
 		if err != nil {
 			aerc.PushError(" " + err.Error())
 		}

doc/aerc.1.scd

@@ -122,7 +122,7 @@ message list, the message in the message viewer, etc).
 
 *open*
 	Saves the current message part in a temporary file and opens it
-	with xdg-open.
+	with the system handler.
 
 *pipe* <cmd>
 	Downloads and pipes the current message part into the given shell command,

lib/open.go

@@ -0,0 +1,12 @@
+// +build !darwin
+
+package lib
+
+import (
+	"os/exec"
+)
+
+func OpenFile(filename string) error {
+	cmd := exec.Command("xdg-open", filename)
+	return cmd.Run()
+}

lib/open_darwin.go

@@ -0,0 +1,10 @@
+package lib
+
+import (
+	"os/exec"
+)
+
+func OpenFile(filename string) error {
+	cmd := exec.Command("open", filename)
+	return cmd.Run()
+}