image: fix terminal size issues. Closes #1314

neofetch

@@ -3700,6 +3700,45 @@ get_w3m_img_path() {
 get_window_size() {
     # This functions gets the current window size in
     # pixels.
+    #
+    # We first try to use the escape sequence "\033[14t"
+    # to get the terminal window size in pixels. If this
+    # fails we then fallback to using "xdotool" or other
+    # programs.
+
+    # Tmux has a special way of reading escape sequences
+    # so we have to use a slightly different sequence to
+    # get the terminal size.
+    if [[ "$image_backend" == "tycat" ]]; then
+        printf '%b' '\e}qs\000'
+
+    elif [[ -z $VTE_VERSION ]]; then
+        case "${TMUX:-null}" in
+            "null") printf '%b' '\e[14t' ;;
+            *)      printf '%b' '\ePtmux;\e\e[14t\e\\ ' ;;
+        esac
+    fi
+
+    # The escape codes above print the desired output as
+    # user input so we have to use read to store the out
+    # -put as a variable.
+    # The 1 second timeout is required for older bash
+    case "${BASH_VERSINFO[0]}" in
+        4|5) IFS=';t' read -d t -t 0.05 -sra term_size ;;
+        *)   IFS=';t' read -d t -t 1 -sra term_size ;;
+    esac
+    unset IFS
+
+    # Split the string into height/width.
+    if [[ "$image_backend" == "tycat" ]]; then
+        term_width="$((term_size[2] * term_size[0]))"
+        term_height="$((term_size[3] * term_size[1]))"
+
+    else
+        term_height="${term_size[1]}"
+        term_width="${term_size[2]}"
+    fi
+
     [[ "$image_backend" == "kitty" ]] &&
         IFS=x read -r term_width term_height <<< "$(kitty +kitten icat --print-window-size)"