Generate mock file based on interface changes using mockgen

mockgen.sh

#!/usr/bin/env bash

# mockgen will generates a mock file based on interface changes
# example:
#   there is changes on the following interface
#   /pkg/sharedcontract/httpconnector.go
#   then the mock will be generated to:
#   /test/fixture/mock/httpconnector_mock.go
#
# for further mock usage, refer to https://github.com/golang/mock
if ! mockgen --version >/dev/null 2>&1; then echo "please run make dev.setup first to install the dependency"; fi;

# Get changed files
files=$(git diff --name-only | sort | uniq)

for file in $files;
do
    if [[ ${file} != "mocks"* && ${file} != *"_test"* && ${file} == *".go" ]]; then
        filename=$(basename -- ${file%%.*})
        dir=$(dirname $file)
        package="$(basename "$(dirname "$file")")"
        echo ${package}
        dest="test/fixture/mock/${filename}_mock.go"
        echo ${dest}

        if [[ ! -f ${file} && -f ${dest} ]]; then
            rm ${dest}
            git add ${dest}
            continue
        fi

        if [[ -f ${file} && $(cat ${file} | grep -i ".* interface {" | wc -l) -ne 0 ]]; then
            $(go env GOPATH)/bin/mockgen -source=${file} -destination=${dest} -package="mock"
            git add ${dest}
            echo "${dest} is generated"
        fi
    fi
done