commands: add align

Add a new :align command that aligns the selected message vertically at
the top, center, or bottom of the message list.

The command requires a position argument that can either be: "top",
"center", or "bottom".

Create the following default keybinds:
	zz = :align center<Enter>
	zt = :align top<Enter>
	zb = :align bottom<Enter>

Changelog-added: Add new `:align` command to align the selected
 message at the top, center, or bottom of the message list.
Suggested-by: Ángel Castañeda <angel@acsq.me>
Signed-off-by: Koni Marti <koni.marti@gmail.com>
Tested-by: Jason Cox <me@jasoncarloscox.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 60 insertions, 0 deletions

diff --git a/commands/account/align.go b/commands/account/align.go
new file mode 100644
index 00000000..7f835b71
--- /dev/null
+++ b/commands/account/align.go
@@ -0,0 +1,60 @@
+package account
+
+import (
+	"errors"
+
+	"git.sr.ht/~rjarry/aerc/app"
+	"git.sr.ht/~rjarry/aerc/commands"
+	"git.sr.ht/~rjarry/aerc/lib/ui"
+)
+
+type Align struct {
+	Pos app.AlignPosition `opt:"pos" metavar:"top|center|bottom" action:"ParsePos" complete:"CompletePos"`
+}
+
+func init() {
+	commands.Register(Align{})
+}
+
+var posNames []string = []string{"top", "center", "bottom"}
+
+func (a *Align) ParsePos(arg string) error {
+	switch arg {
+	case "top":
+		a.Pos = app.AlignTop
+	case "center":
+		a.Pos = app.AlignCenter
+	case "bottom":
+		a.Pos = app.AlignBottom
+	default:
+		return errors.New("invalid alignment")
+	}
+	return nil
+}
+
+func (a *Align) CompletePos(arg string) []string {
+	return commands.FilterList(posNames, arg, commands.QuoteSpace)
+}
+
+func (Align) Context() commands.CommandContext {
+	return commands.ACCOUNT
+}
+
+func (Align) Aliases() []string {
+	return []string{"align"}
+}
+
+func (a Align) Execute(args []string) error {
+	acct := app.SelectedAccount()
+	if acct == nil {
+		return errors.New("no account selected")
+	}
+	msgList := acct.Messages()
+	if msgList == nil {
+		return errors.New("no message list available")
+	}
+	msgList.AlignMessage(a.Pos)
+	ui.Invalidate()
+
+	return nil
+}