How to ignore '\r' while counting characters of several files with wc -m

I try to count characters that where submitted to git by the author "JohnJohnson" using this command:

wc -m $(git log --use-mailmap --no-merges --author="JohnJohnson" --name-only --pretty=format:"" | sort -u)

The problem is that on Linux and Windows(git-bash) it produces different results, at least because on Windows the new line consists of two chars '\r\n'. Is there a way to make wc -m to ignore '\r' so I get consistent results on both OSs with the same command?

Solution

NOTE: While running dos2unix on each file before running wc -m should suffice, I'm assuming a) dos2unix is not available and/or b) OP may find there are other characters (besides \r) that need to be removed.

Assuming the objective is to generate the same exact output as wc -m, one idea using a user-defined function:

my_wc () {
    local charcount=0 totcount=0

    for fname in $@
    do
        charcount=$(tr -d '\r' < $fname | wc -m)
        echo "$charcount $fname" 
        ((totcount+=charcount))
    done

    echo "$totcount total"
}

Applying to OP's example:

my_wc $(git log --use-mailmap --no-merges --author="JohnJohnson" --name-only --pretty=format:"" | sort -u)

If OP finds additional characters (besides \r) to skip then add them to the tr -d '\r' call).

Another function idea but this one uses awk:

my_wc() {
    awk 'BEGIN { RS="^$" }                  # whole file becomes one single, long record
               { gsub("\r","")
                 n=length($0)
                 tot+=n
                 print n,FILENAME
               }
         END   { print tot,"total"}' $@
}

Demonstrating these functions on a few sample files:

$ head f?
==> f1 <==
a       13
a       5
b       7
a       20
a       3

==> f2 <==
a       13
a       5
b       7
a       20
a       3

==> f3 <==
a       13
a       5
b       7
a       20
a       3

$ dos2unix f?

$ wc -m f?
22 f1
22 f2
22 f3
66 total

$ unix2dos f?

$ wc -m f?
27 f1
27 f2
27 f3
81 total

$ my_wc f?
22 f1
22 f2
22 f3
66 total