count.sh

#!/bin/sh
find . \( -iname "*.[chm]" -o -iname "*.swift" -o -iname "*.cpp" -o -iname "*.mm" -o -iname "*.xm" \) -print0 | xargs -0 cat | wc -l

For server side python projects

find . \( -iname "*.sh" -o -iname "*.html" -o -iname "*.js" -o -iname "*.css" -o -iname "*.py" -o -iname "*.conf" -o -iname "*.service" -o -iname "*.ini" -o -iname "*.md" \) -print0 | xargs -0 cat | wc -l

For Xamarin Projects (including everything)

find . \( -iname "*.[chm]" -o -iname "*.swift" -o -iname "*.cpp" -o -iname "*.mm" -o -iname "*.xm" -o -iname "*.cs" -o -iname "*.xaml" -o -iname "*.xml" -o -iname "*.json" -o -iname "*.sln" -o -iname "*.plist" -o -iname "*.csproj" -o -iname "*.config" -o -iname "*.xib" -o -iname "*.storyboard" -o -iname "*.resx" \) -print0 | xargs -0 cat | wc -l

For Xamarin Projects (C# only)

find . \( -iname "*.[chm]" -o -iname "*.cs" -o -iname "*.xaml" -o -iname "*.resx" \) -print0 | xargs -0 cat | wc -l