[PATCH] passmenu: add support for wayland

[sternenseemann]

Use a similar detection mechanism to pass itself.

On wayland use:

* dmenu-wl instead of dmenu, an (almost) drop-in replacement
* ydotool instead of xdotool, a uinput-based replacement for
  xdotool. It is not as feature-complete, but probably the
  simplest (or only?) way to add the --type functionality to
  passmenu on wayland.
---
 contrib/dmenu/README.md |  7 +++++++
 contrib/dmenu/passmenu  | 16 +++++++++++++---
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/contrib/dmenu/README.md b/contrib/dmenu/README.md
index 9d54fb4..8a196cb 100644
--- a/contrib/dmenu/README.md
+++ b/contrib/dmenu/README.md
@@ -4,6 +4,10 @@ clipboard without having to open up a terminal window if you don't already have
 one open. If `--type` is specified, the password is typed using [xdotool][]
 instead of copied to the clipboard.
 
+On wayland [dmenu-wl][] is used to replace dmenu and [ydotool][] to replace xdotool.
+Note that the latter requires access to the [uinput][] device, so you'll probably
+need to add an extra udev rule or similar to give certain non-root users permission.
+
 # Usage
 
     passmenu [--type] [dmenu arguments...]
@@ -11,3 +15,6 @@ instead of copied to the clipboard.
 [dmenu]: http://tools.suckless.org/dmenu/
 [xdotool]: http://www.semicomplete.com/projects/xdotool/
 [pass]: http://www.zx2c4.com/projects/password-store/
+[dmenu-wl]: https://github.com/nyyManni/dmenu-wayland
+[ydotool]: https://github.com/ReimuNotMoe/ydotool
+[uinput]: https://www.kernel.org/doc/html/v4.12/input/uinput.html
diff --git a/contrib/dmenu/passmenu b/contrib/dmenu/passmenu
index 83268bc..76d92ab 100755
--- a/contrib/dmenu/passmenu
+++ b/contrib/dmenu/passmenu
@@ -8,18 +8,28 @@ if [[ $1 == "--type" ]]; then
 	shift
 fi
 
+if [[ -n $WAYLAND_DISPLAY ]]; then
+	dmenu=dmenu-wl
+	xdotool="ydotool type --file -"
+elif [[ -n $DISPLAY ]]; then
+	dmenu=dmenu
+	xdotool="xdotool type --clearmodifiers --file -"
+else
+	echo "Error: No Wayland or X11 display detected" >&2
+	exit 1
+fi
+
 prefix=${PASSWORD_STORE_DIR-~/.password-store}
 password_files=( "$prefix"/**/*.gpg )
 password_files=( "${password_files[@]#"$prefix"/}" )
 password_files=( "${password_files[@]%.gpg}" )
 
-password=$(printf '%s\n' "${password_files[@]}" | dmenu "$@")
+password=$(printf '%s\n' "${password_files[@]}" | "$dmenu" "$@")
 
 [[ -n $password ]] || exit
 
 if [[ $typeit -eq 0 ]]; then
 	pass show -c "$password" 2>/dev/null
 else
-	pass show "$password" | { IFS= read -r pass; printf %s "$pass"; } |
-		xdotool type --clearmodifiers --file -
+	pass show "$password" | { IFS= read -r pass; printf %s "$pass"; } | $xdotool
 fi
-- 
2.27.0