refactor(install\_software.sh): add support for lf previewer in the script and configure it

feat(install\_software.sh): install lf previewer and set it up as default previewer for various file types
[lf\_preview.sh]: new file: create a new script to handle file previews using lf previewer

install_software.sh

@@ -30,6 +30,21 @@ python3-pip          	       `# pip` \
 tensorrt-libs \
 bat
 
+# lf settings
+sudo cp lf_preview.sh /usr/local/bin
+cat << 'EOF' > lfrc
+set previewer lf_preview.sh
+cmd trash %set -f; mv $fx ~/.trash
+map <delete> trash
+map i $batcat --force-colorization $f
+map x $$f
+map o $mimeopen --ask $f
+EOF
+
+sudo mkdir /etc/lf
+sudo cp lfrc /etc/lf
+rm -f lfrc
+
 if [ ! -f /etc/docker/daemon.json ]
 then	
   sudo nvidia-ctk runtime configure --runtime=docker --set-as-default

lf_preview.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+
+MIME=$(mimetype --all --brief "$1")
+#echo "$MIME"
+
+case "$MIME" in
+    # .pdf
+    *application/pdf*)
+        pdftotext "$1" -
+        ;;
+    # .jpeg
+#    *image/jpeg*)
+#        sxiv "$1"
+#        ;;
+    # .7z
+    *application/x-7z-compressed*)
+        7z l "$1"
+        ;;
+    # .tar .tar.Z
+    *application/x-tar*)
+        tar -tvf "$1"
+        ;;
+    # .tar.*
+    *application/x-compressed-tar*|*application/x-*-compressed-tar*)
+        tar -tvf "$1"
+        ;;
+    # .rar
+    *application/vnd.rar*)
+        unrar l "$1"
+        ;;
+    # .zip
+    *application/zip*)
+        unzip -l "$1"
+        ;;
+    # any plain text file that doesn't have a specific handler
+    *text/plain*)
+        # return false to always repaint, in case terminal size changes
+        batcat --force-colorization --paging=never --style=changes,numbers \
+            --terminal-width $(($2 - 3)) "$1" && false
+        ;;
+    *)
+        echo "unknown format"
+        ;;
+esac