add support for turning current win into dropdown

tdrop

@@ -6,9 +6,9 @@ print_help() {
 
 	Also supports the ability to auto-hide and auto-show. For example, this can be used to automatically hide a window when opening something, e.g. image viewer, video player, etc. from it, and then re-show the window whenever the image view, video player, etc. is closed.
 
-	Takes a terminal as an argument or one of auto_show, auto_hide, or toggle_auto_hide. 'toggle_auto_hide' toggles whether calling 'auto_hide' or 'auto_show' will have any effect.
+	Takes a window as an argument or one of auto_show, auto_hide, or toggle_auto_hide. 'toggle_auto_hide' toggles whether calling 'auto_hide' or 'auto_show' will have any effect. 'current' will turn the current window into a dropdown.
 
-usage: tdrop [options] <program> or <auto_show/auto_hide/toggle_auto_hide>
+usage: tdrop [options] <program or 'current'> or one of <auto_show/auto_hide/toggle_auto_hide>
 options:
 	-h height    specify a height for a newly created term (default: 100%)
 	-w width     specify a width for a newly created term (default: 45%)
@@ -18,7 +18,8 @@ options:
 	-n num       num or extra text; only needed if want multiple dropdowns of same program (default: "")
 	-p cmd       provide a pre command to float the window if necessary
 	-P cmd       provide a post command to float the window if necessary
-	-W           the given program is not a terminal (or lacks an -e flag) (default: assume it IS terminal)
+	-O cmd       provide a one time command only for when a dropdown is created/initiated (useful for 'tdrop -c')
+	-W           the given program is not a terminal (or lacks an -e flag) (default: assume it IS a terminal)
 	--no-cancel  don't cancel auto-showing
 	             (default is to prevent this when manually toggling a term after it is auto-hidden)
 	--help       print help
@@ -39,12 +40,13 @@ xoff=0
 yoff=1
 float_pre=""
 float_post=""
+oneshot_post=""
 session_name=""
 num=""
 normal_window=false
 cancel_auto_show=true
 term=${*:0-1}
-while getopts :h:w:x:y:s:n:p:P:-:W opt
+while getopts :h:w:x:y:s:n:p:P:O:-:W opt
 do
 	case $opt in
 	h) height=$OPTARG;;
@@ -55,6 +57,7 @@ do
 	n) num=$OPTARG;;
 	p) float_pre=$OPTARG;;
 	P) float_post=$OPTARG;;
+	O) oneshot_post=$OPTARG;;
 	W) normal_window=true;;
 	-)
 		OPTION=$(echo "$OPTARG" | awk -F '=' '{print $1}')
@@ -68,6 +71,7 @@ do
 		number) num=$OPTARG;;
 		pre-command) float_pre=$OPTARG;;
 		post-command) float_post=$OPTARG;;
+		oneshot-post) oneshot_post=$OPTARG;;
 		normal-window) normal_window=true;;
 		no-cancel) cancel_auto_show=false;;
 		help) print_help;;
@@ -86,7 +90,9 @@ float_pre_command() {
 }
 
 float_post_command() {
-	if [[ -n $float_post ]]; then
+	if [[ -n $oneshot_post ]] && [[ $1 == oneshot ]]; then
+		eval "$oneshot_post"
+	elif [[ -n $float_post ]]; then
 		eval "$float_post"
 	fi
 }
@@ -121,6 +127,13 @@ win_create() {
 	xdotool windowmove "$wid" "$xoff" "$yoff" windowsize "$wid" "$width" "$height"
 }
 
+current_create() {
+	# turns active window into a dropdown
+	wid=$(xdotool getactivewindow)
+	echo "$wid" > /tmp/tdrop/current"$num"
+	xprop -id "$(xprop -root _NET_ACTIVE_WINDOW | awk '{print $5}')" WM_CLASS | awk '{ gsub(/"/, ""); print $4}' > /tmp/tdrop/current"$num"_type
+}
+
 wid_toggle() {
 	mkdir -p /tmp/tdrop
 	# get saved window id if already created
@@ -137,7 +150,11 @@ wid_toggle() {
 	fi
 	if $exists && [[ $visibility != IsUnviewable ]]; then
 		if [[ $visibility == IsUnMapped ]]; then
+			if [[ $term == current ]]; then
+				float_pre_command "$(< /tmp/tdrop/current"$num"_type)"
+			else
 				float_pre_command "$term"
+			fi
 			xdotool windowmap "$wid"
 			float_post_command
 		else
@@ -147,12 +164,14 @@ wid_toggle() {
 	else
 		# make it
 		float_pre_command "$term"
-		if $normal_window; then
+		if [[ $term == current ]]; then
+			current_create
+		elif $normal_window; then
 			win_create
 		else
 			term_create
 		fi
-		float_post_command
+		float_post_command oneshot
 	fi
 }