Bash script that runs in repl.it gives syntax error when in git alias

Question

I'm trying to write a bash script for a git alias, to automate something.

I've written the script in repl.it, and it works without issue. However when I've taken the script and put it into my .gitconfig, and reduced it to a single line I'm now getting syntax errors.

 -c: line 0: syntax error near unexpected token `then'

This obviously isn't helpful at all since everything is on a single line.

Here is the script on one line as it exists in my git config

markaswip = "!f(){ fullBranchName='jm/branch/name'; IFS='/' read -r -a array <<< $fullBranchName; hasBranch=0; for element in "${array[@]}" do if [ "$element" = $"wip" ]; then hasBranch=1; fi; done; if [ $hasBranch = 1 ]; then echo "Has WIP tag already"; else appendedString=$(printf '%s/' "${newArray[@]}"); output=${appendedString%?}; echo $output; git branch -m ${commitmessage}; fi; }; f"

And here it is unrolled

f() {
    fullBranchName='test/branch/name';
    IFS='/' read -r -a array <<< $fullBranchName
    hasBranch=0;
    for element in "${array[@]}"
    do
        if [ "$element" = $"wip" ];
        then
        hasBranch=1;
        fi;
    done;
    
    if [ $hasBranch = 1 ]; 
    then
        echo "Has WIP tag already";
    else 
        newArray=( "${array[@]:0:1}" "wip" "${array[@]:1}" );
        appendedString=$(printf '%s/' "${newArray[@]}")
        #printf '%s/' "${newArray[@]}"
        output=${appendedString%?}
        echo $output;
        #git branch -m ${commitmessage};
    fi;
}
f;