get-terminal-theme: fix vscode ssh sessions

commands/get-terminal-theme

@@ -41,7 +41,7 @@ function get_terminal_theme() (
 
 	# =====================================
 	# Action
-
+	
 	# on macos, one can do this:
 	# osascript -e 'tell application "Terminal" to get the background color of the current settings of the selected tab of front window'
 	# to get back:
@@ -75,7 +75,10 @@ function get_terminal_theme() (
 		# If the background color is `ba1a2b3c` the read will return `1a74/2b98/3cb6`
 		local _ color='' r g b l
 		# stdin+stderr must be readable+writable for the read to work, but we can't check silently, as failures are noisey, and silencing the failures causes them to close: https://gist.github.com/balupton/6eee015345c663d7d7baf83d8e20ce1f so just note in this comment
-		IFS=: read -s -t "$(get_read_decimal_timeout 0.01)" -d $'\a' -p $'\e]11;?\a' _ color || :
+		# as terminal theme is really only important for TTY use cases, use is-tty, this also solves vscode unable to ssh session into a machine
+		if is-tty; then
+			IFS=: read -s -t "$(get_read_decimal_timeout 0.01)" -d $'\a' -p $'\e]11;?\a' _ color || :
+		fi
 		if test -n "$color"; then
 			# Fetch the first two characters of [1a]74/[2b]98/[3c]b6 which is our color, and convert from hexadecimal to decimal
 			# For what the latter two characters are, no one seems to know: https://unix.stackexchange.com/q/754952/50703