config: replace triggers with hooks

Deprecate triggers and replace them with hooks. Now that aerc supports
running arbitrary ex commands over IPC, it is possible to run internal
aerc commands *and* shell commands via external shell scripts. Hooks
only allow running shell commands. Hooks info is passed via environment
variables.

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

3 files changed, 53 insertions, 0 deletions

diff --git a/lib/hooks/exec.go b/lib/hooks/exec.go
new file mode 100644
index 00000000..bea35f32
--- /dev/null
+++ b/lib/hooks/exec.go
@@ -0,0 +1,22 @@
+package hooks
+
+import (
+	"os"
+	"os/exec"
+
+	"git.sr.ht/~rjarry/aerc/log"
+)
+
+func RunHook(h HookType) error {
+	cmd := h.Cmd()
+	if cmd == "" {
+		return nil
+	}
+	env := h.Env()
+	log.Debugf("hooks: running command %q (env %v)", cmd, env)
+
+	proc := exec.Command("sh", "-c", cmd)
+	proc.Env = os.Environ()
+	proc.Env = append(proc.Env, env...)
+	return proc.Run()
+}
diff --git a/lib/hooks/interface.go b/lib/hooks/interface.go
new file mode 100644
index 00000000..ed38c3ac
--- /dev/null
+++ b/lib/hooks/interface.go
@@ -0,0 +1,6 @@
+package hooks
+
+type HookType interface {
+	Cmd() string
+	Env() []string
+}
diff --git a/lib/hooks/mail-received.go b/lib/hooks/mail-received.go
new file mode 100644
index 00000000..66622e9e
--- /dev/null
+++ b/lib/hooks/mail-received.go
@@ -0,0 +1,25 @@
+package hooks
+
+import (
+	"fmt"
+
+	"git.sr.ht/~rjarry/aerc/config"
+	"git.sr.ht/~rjarry/aerc/models"
+)
+
+type MailReceived struct {
+	MsgInfo *models.MessageInfo
+}
+
+func (m *MailReceived) Cmd() string {
+	return config.Hooks.MailReceived
+}
+
+func (m *MailReceived) Env() []string {
+	from := m.MsgInfo.Envelope.From[0]
+	return []string{
+		fmt.Sprintf("AERC_FROM_NAME=%s", from.Name),
+		fmt.Sprintf("AERC_FROM_ADDRESS=%s", from.Address),
+		fmt.Sprintf("AERC_SUBJECT=%s", m.MsgInfo.Envelope.Subject),
+	}
+}