Bash Scripting: How to open Kate with directory and filename? - bash

Question

I am completely new to Bash scripting so bare with me while I try to describe this.
What I want to do be able to insert two arguments.
Arg1=Sub Folder in Documents
Arg2=Title of the text file
Using Ubuntu 20.10. (If that matters)
In short: kate ~/Documents/$Arg1/$Arg2 would be the equivalent to the command I would enter into my terminal.
The extra catch is having a keyword shortcut for the Sub Folder. For example say the Sub folder was name SUPERLONGNAME_EXTRALONG but I want a shortcut such as SHORTNAME=SUPERLONGNAME_EXTRALONG
#!/bin/sh
newfile()
dirname=$1
filename=$2
if $dirname==dir1
dirname=newdirname
fi
kate ~/Documents/$dirname/$filename
This is basically what I have now. Although as you would guess this doesn't work. (Provided for aid in seeing what I am trying to do). I can open kate within the home directory with the file name of my choice. My real issue seems to be the creating a shortcut keyword. As well as having the file save to the Document/Arg1 directory. Please help.
I run the command through terminal using
sh newfile arg1 arg2

Answer 1

Use an associate array shortnames to optionally translate from long to short names. Verify that file and directory exist:
#!/bin/bash
declare -A shortnames=(
[long]="short"
)
d=$1
f=$2
if [ -z "$d" ]
then
echo directory required
exit 1
fi
if [ -n "${shortnames[$d]}" ]
then
d=${shortnames[$d]}
fi
d=~/Documents/$d
if [ ! -d "$d" ]
then
echo "directory $d does not exist"
exit 1
fi
if [ -z "$f" ]
then
echo file required
exit 1
fi
kate "$d/$f"