commands: add menu

Add a new :menu command that can be used to spawn a shell command in an
interactive dialog and execute aerc commands for each of the lines
printed on its standard output like xargs(1) would do in a shell.

The shell command can be configured in aerc.conf under
[general].default-menu-cmd and overridden via the :menu -c <cmd> option.

There are two flags to provide input text to the shell command which can
be useful in combination with other aerc commands:

	-a: All account names, one per line:
		'<account>' LF

	-d: All current account directory names, one per line:
		'<directory>' LF

	-ad: All directories of all accounts, one per line:
		'<account>' '<directory>' LF

Here are some examples:

	:menu -adc fzf :cf -a
	:menu -c 'fzf --multi' :attach
	:menu -dc 'fzf --multi' :cp

And also for key bindings:

	<C-p> = :menu -adc fzf :cf -a<Enter>

Changelog-added: New `:menu` command to invoke other aerc commands
 based on a shell command output.
Signed-off-by: Robin Jarry <robin@jarry.cc>
Tested-by: Bence Ferdinandy <bence@ferdinandy.com>
Tested-by: Johannes Thyssen Tishman <johannes@thyssentishman.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/config/general.go b/config/general.go
index f4149583..93794b6a 100644
--- a/config/general.go
+++ b/config/general.go
@@ -19,6 +19,7 @@ type GeneralConfig struct {
 	DisableIPC         bool         `ini:"disable-ipc"`
 	EnableOSC8         bool         `ini:"enable-osc8" default:"false"`
 	Term               string       `ini:"term" default:"xterm-256color"`
+	DefaultMenuCmd     string       `ini:"default-menu-cmd"`
 }
 
 var General = new(GeneralConfig)