diff --git a/themes/jacaetevha/TBytes.sh b/themes/jacaetevha/TBytes.sh
deleted file mode 100755
index e452d01..0000000
--- a/themes/jacaetevha/TBytes.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/bin/bash
-#Sum the number of bytes in a directory listing
-TBytes=0
-# swap the next two lines in order to get a summary with the sizes of directories as well
-#for Bytes in $(ls -l | awk '{ print $5 }')
-for Bytes in $(ls -l | grep "^-" | awk '{ print $5 }')
-do
-    let TBytes=$TBytes+$Bytes
-done
-
-Total=$(echo -e "scale=3 \n$TBytes/1048576 \nquit" | bc)
-Units=" Mb"
-if [[ TBytes -lt 1048576 ]]
-then
-    Total=$(echo -e "scale=3 \n$TBytes/1048 \nquit" | bc)
-    Units=" Kb"
-fi
-echo -n "$Total$Units"
diff --git a/themes/jacaetevha/fish_prompt.fish b/themes/jacaetevha/fish_prompt.fish
index e5ec779..964f16d 100644
--- a/themes/jacaetevha/fish_prompt.fish
+++ b/themes/jacaetevha/fish_prompt.fish
@@ -1,5 +1,7 @@
 function fish_prompt
   set -l script_dir (dirname (status -f))
+  . $script_dir/tbytes.sh
+
   set_color yellow
   printf '%s' (whoami)
   set_color normal
@@ -13,7 +15,7 @@ function fish_prompt
   set_color $fish_color_cwd
   printf '%s ' (prompt_pwd)
   set_color blue
-  printf '%s' ($script_dir/TBytes.sh)
+  printf '%s' (tbytes)
   set_color normal
   printf '%s' (__fish_git_prompt)
 
diff --git a/themes/jacaetevha/tbytes.fish b/themes/jacaetevha/tbytes.fish
new file mode 100755
index 0000000..01f203b
--- /dev/null
+++ b/themes/jacaetevha/tbytes.fish
@@ -0,0 +1,12 @@
+function tbytes -d 'calculates the total size of the files in the current directory'
+  set -g tBytes (ls -al | grep "^-" | awk 'BEGIN {i=0} { i += $5 } END { print i }')
+  
+  if test $tBytes -lt 1048576
+    set -g total (echo -e "scale=3 \n$tBytes/1048 \nquit" | bc)
+    set -g units " Kb"
+  else
+    set -g total (echo -e "scale=3 \n$tBytes/1048576 \nquit" | bc)
+    set -g units " Mb"
+  end
+  echo -n "$total$units"
+end