ipc: change protocol to JSON

In overhauling the IPC, it has become necessary to switch to a more
extendable message format, to ensure more complex commands can be sent.

Messages have the following basic structure and must not contain
linebreaks, as these are used to delimit separate messages from one
another.

    {"arguments": ["mailto:moritz@poldrack.dev"]}

The responses have the following structure:

    {"error": "epic fail"}

If the IPC request was successful, "error" will be empty.

    {"error": ""}

Signed-off-by: Moritz Poldrack <git@moritz.sh>
Signed-off-by: Robin Jarry <robin@jarry.cc>

1 files changed, 3 insertions, 8 deletions

diff --git a/aerc.go b/aerc.go
index 9ed4a2ca..f4247ed5 100644
--- a/aerc.go
+++ b/aerc.go
@@ -159,12 +159,8 @@ func main() {
 	}
 	retryExec := false
 	args := os.Args[optind:]
-	if len(args) > 1 {
-		usage("error: invalid arguments")
-		return
-	} else if len(args) == 1 {
-		arg := args[0]
-		err := ipc.ConnectAndExec(arg)
+	if len(args) > 0 {
+		err := ipc.ConnectAndExec(args)
 		if err == nil {
 			return // other aerc instance takes over
 		}
@@ -232,8 +228,7 @@ func main() {
 
 	if retryExec {
 		// retry execution
-		arg := args[0]
-		err := ipc.ConnectAndExec(arg)
+		err := ipc.ConnectAndExec(args)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Failed to communicate to aerc: %v\n", err)
 			err = aerc.CloseBackends()