add tty support

README.md

@@ -19,6 +19,7 @@ Right now, it runs in
 And has experimental support for
 
 -   [libsixel](https://github.com/saitoha/libsixel)
+-   The linux TTY
 
 It is a ridiculous hack---a bash script wrapped around some special terminal
 escape codes and a bunch of command line tools. But it works well enough for me to be useful.
@@ -175,6 +176,15 @@ Here is a screenshot of the best results I can get using a version of xterm buil
 
 ![sixel screenshot](screenshot_xterm.png)
 
+w3m-imgcat
+----------
+
+If you want to try out the experimental w3m-imgcat support, be sure you have `w3m-img` for debian or `w3m-imgcat` for arch installed.
+
+Here is a screenshot of the best results I can get using w3m-imgcat on linux 6.3.3:
+
+![TTY screenshot](screenshot_tty.png)
+
 Installation
 ============
 
@@ -190,6 +200,7 @@ $ termpdf -h
 termpdf <options> <file/directory>
   -d n, --depth N                    how deep to search directories for images
   -sixel                             use libsixel to (badly) display graphics     
+  -imgcat                            use w3m-imgcat to display graphics
   -kitty                             force using kitty to display graphics
   -iterm                             force using iterm to display graphics
   -k                                 list keyboard shortcuts
@@ -217,7 +228,7 @@ depth of `find`'s recursive search.
 
 By default, `termpdf` uses Kitty's image rendering if it is available, and
 otherwise tries to use iTerm's image rendering. You can override this behavior
-by specifying one of `-sixel`, `-kitty`, or `-iterm`.
+by specifying one of `-sixel`, `imgcat`, `-kitty`, or `-iterm`.
 
 Keyboard Shortcuts
 ------------------

termpdf

@@ -10,7 +10,7 @@ fi
 ###########################################################################
 # termpdf is a barebones inline pdf and djvu viewer. It currently works
 # in iTerm 2.9 or later, Kitty, and (very badly) in terminals that support
-# libsixel,
+# libsixel, and the tty with w3m-imgcat.
 #
 # It is a ridiculous hack, but it usually works for me.
 ###########################################################################
@@ -270,6 +270,10 @@ function second_setup() {
             ;;
         linux*)
             guiviewer="xdg-open"
+            imgcat="w3m-img"
+            if ! type "w3m-img" > /dev/null; then
+                imgcat="imgcat"
+            fi
             ;;
         *)
             guiviewer="unknown"
@@ -864,6 +868,7 @@ function clihelp() {
 $(basename $0) <options> <file/directory>
   -d n, --depth N    % how deep to search directories for images
   -sixel             % use libsixel to (badly) display graphics     
+  -imgcat            % use w3m-imgcat to display graphics
   -kitty             % force using kitty to display graphics
   -iterm             % force using iterm to display graphics
   -k                 % list keyboard shortcuts
@@ -1401,6 +1406,9 @@ function extract_and_display_page() {
         "sixel")
             img2sixel -h $target_height -w $target_width -q full -b vt340color "$image"
             ;;
+        "imgcat")
+            $imgcat "$image"
+            ;;
         "iterm")
             tput cup 0 0 
             print_image_iterm "$image" 1 "$(base64 < "$image")" $width $(echo 'scale=0;'"$height" \* "$zoom" / 100 | bc -l)
@@ -1515,6 +1523,10 @@ while [[ "$1" == '-'* ]]; do
             protocol="sixel"
             shift
             ;;
+        -imgcat|--imgcat)
+            protocol="imgcat"
+            shift
+            ;;
         -kitty|--kitty)
             protocol="kitty"
             shift