Implement swaynag -B/--button-no-terminal

In `i3 4.16`, `i3-nagbar` introduces the flags `-B/--button-no-terminal`
to run the action directly instead of inside a terminal. This implements
the flags for swaynag for compatibility.

Since swaynag does not use an equivalent to `i3-sensible-terminal`, the
flags `-b/--button` only uses a terminal when the environment variable
`TERMINAL` is set, otherwise it acts the same as these new flags.

1 files changed, 8 insertions, 1 deletions

diff --git a/swaynag/swaynag.1.scd b/swaynag/swaynag.1.scd
index bb69e47d..b25568a0 100644
--- a/swaynag/swaynag.1.scd
+++ b/swaynag/swaynag.1.scd
@@ -12,7 +12,14 @@ _swaynag_ [options...]
 
 *-b, --button* <text> <action>
         Create a button with the text _text_ that executes _action_ when pressed.
-        Multiple buttons can be defined by providing the flag multiple times.
+        If the environment variable `TERMINAL` is set, _action_ will be run inside
+        the terminal. Otherwise, it will fallback to running directly. Multiple
+        buttons can be defined by providing the flag multiple times.
+
+*-B, --button-no-terminal* <text> <action>
+        Create a button with the text _text_ that executes _action_ when pressed.
+        _action_ will be run directly instead of in a terminal. Multiple buttons
+        can be defined by providing the flag multiple times.
 
 *-c, --config* <path>
         The config file to use. By default, the following paths are checked: