add bash scripts

code/misc/bash/nnn/nnn-preview.sh

@@ -0,0 +1,39 @@
+nnn-preview ()
+{
+    # Block nesting of nnn in subshells
+    if [ -n "$NNNLVL" ] && [ "${NNNLVL:-0}" -ge 1 ]; then
+        echo "nnn is already running"
+        return
+    fi
+
+    # The default behaviour is to cd on quit (nnn checks if NNN_TMPFILE is set)
+    # If NNN_TMPFILE is set to a custom path, it must be exported for nnn to see.
+    # To cd on quit only on ^G, remove the "export" and set NNN_TMPFILE *exactly* as this:
+    #     NNN_TMPFILE="${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.lastd"
+    export NNN_TMPFILE="${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.lastd"
+
+    # This will create a fifo where all nnn selections will be written to
+    NNN_FIFO="$(mktemp --suffix=-nnn -u)"
+    export NNN_FIFO
+    (umask 077; mkfifo "$NNN_FIFO")
+
+    # Preview command
+    preview_cmd="/media/dl92/mydata/projects/code/Bash/nnn/preview_cmd.sh"
+
+    # Use `tmux` split as preview
+    if [ -e "${TMUX%%,*}" ]; then
+        tmux split-window -e "NNN_FIFO=$NNN_FIFO" -dh "$preview_cmd"
+
+    # Use `xterm` as a preview window
+    elif (which xterm &> /dev/null); then
+        xterm -e "$preview_cmd" &
+
+    # Unable to find a program to use as a preview window
+    else
+        echo "unable to open preview, please install tmux or xterm"
+    fi
+
+    nnn "$@"
+
+    rm -f "$NNN_FIFO"
+}