hooks: add aerc-startup hook

Add a hook to run when aerc starts up. The environment is supplemented
with aerc version and the path to its binary.

References: https://todo.sr.ht/~rjarry/aerc/136
References: https://todo.sr.ht/~rjarry/aerc/139
Signed-off-by: Moritz Poldrack <git@moritz.sh>
Signed-off-by: Robin Jarry <robin@jarry.cc>
Tested-by: Bence Ferdinandy <bence@ferdinandy.com>

CHANGELOG.md

@@ -22,7 +22,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   `aerc.conf`.
 - Allow basic shell globbing in `[openers]` MIME types.
 - Dynamic `msglist_*` styling based on email header values in stylesets.
-- Add `mail-received` hook.
+- Add `mail-received` and `aerc-startup` hooks.
 
 ### Changed
 

config/aerc.conf

@@ -514,6 +514,10 @@ message/rfc822=colorize
 # Executed when a new email arrives in the selected folder
 #mail-received=notify-send "New mail from $AERC_FROM_NAME" "$AERC_SUBJECT"
 
+#
+# Executed when aerc starts
+#aerc-startup=aerc :terminal calcurse && aerc :next-tab
+
 [templates]
 # Templates are used to populate email bodies automatically.
 #

config/hooks.go

@@ -8,6 +8,7 @@ import (
 )
 
 type HooksConfig struct {
+	AercStartup  string `ini:"aerc-startup"`
 	MailReceived string `ini:"mail-received"`
 }
 

doc/aerc-config.5.scd

@@ -826,6 +826,21 @@ in a shell environment with information added to environment variables.
 
 They are configured in the *[hooks]* section of aerc.conf.
 
+*aerc-startup* = _<command>_
+	Executed when aerc is started is received in the selected folder. If it
+	is used to run certain commands at startup. The hook is executed as soon
+	as the UI is initialized and does not wait for all accounts to be fully
+	loaded.
+
+	Variables:
+
+	- *AERC_VERSION*
+	- *AERC_BINARY*
+
+	Example:
+
+		*aerc-startup* = _aerc :terminal calcurse && aerc :next-tab_
+
 *mail-received* = _<command>_
 	Executed when new mail is received in the selected folder. This will
 	only work reliably with maildir and some imap servers.

lib/hooks/aerc-startup.go

@@ -0,0 +1,23 @@
+package hooks
+
+import (
+	"fmt"
+	"os"
+
+	"git.sr.ht/~rjarry/aerc/config"
+)
+
+type AercStartup struct {
+	Version string
+}
+
+func (m *AercStartup) Cmd() string {
+	return config.Hooks.AercStartup
+}
+
+func (m *AercStartup) Env() []string {
+	return []string{
+		fmt.Sprintf("AERC_VERSION=%s", m.Version),
+		fmt.Sprintf("AERC_BINARY=%s", os.Args[0]),
+	}
+}

main.go

@@ -23,6 +23,7 @@ import (
 	"git.sr.ht/~rjarry/aerc/commands/terminal"
 	"git.sr.ht/~rjarry/aerc/config"
 	"git.sr.ht/~rjarry/aerc/lib/crypto"
+	"git.sr.ht/~rjarry/aerc/lib/hooks"
 	"git.sr.ht/~rjarry/aerc/lib/ipc"
 	"git.sr.ht/~rjarry/aerc/lib/templates"
 	libui "git.sr.ht/~rjarry/aerc/lib/ui"
@@ -242,6 +243,14 @@ func main() {
 	}
 
 	ui.ChannelEvents()
+	go func() {
+		defer log.PanicHandler()
+		err := hooks.RunHook(&hooks.AercStartup{Version: Version})
+		if err != nil {
+			msg := fmt.Sprintf("aerc-startup hook: %s", err)
+			aerc.PushError(msg)
+		}
+	}()
 	for event := range libui.MsgChannel {
 		switch event := event.(type) {
 		case tcell.Event: