Force replace go_package

removing declaration of go_package and replace it with our own go_package declaration.
add replace statement in go.mod in order to make go module looking for local resource instead of remote.

.gitignore

@@ -3,3 +3,4 @@ gripmock
 .idea
 .DS_Store
 protogen
+temp

example/multi-package/foo.proto

@@ -4,7 +4,8 @@ syntax = "proto3";
 // but different package
 package foo;
 
-option go_package = "github.com/tokopedia/gripmock/example/multi-package";
+// simulating dummy private repo
+option go_package = "github.com/my/private/repo/multi-package";
 
 message Response {
     string response = 1;

fix_gopackage.sh

@@ -4,29 +4,39 @@ protos=("$@")
 
 for proto in "${protos[@]}"
 do
-  if grep '^option go_package' $proto;then
-   echo "option go_package detected in $proto, no need to append"
-   exit 1
-  fi
-done
-
-for proto in "${protos[@]}"
-do
+  # if it's a directory then skip
   if [[ -d $proto ]]; then
     continue
   fi
 
+  # example $proto: example/foo/bar/hello.proto
+
+  # get string from left until the last /
+  # example value: example/foo/bar/
   dir=${proto%/*}
+
+  # get string from right until the first /
+  # example value: hello.proto
   file=${proto##*/}
 
   newdir="protogen/$dir"
   newfile="$newdir/$file"
+
   # copy to protogen directory
-  mkdir -p "$newdir" && cp "$proto" "$_"
+  mkdir -p "$newdir" && \
+    cp "$proto" "$_" && \
+
+    # Force remove any declaration of go_package
+    # then replace it with our own declaration below
+    sed -i 's/^option go_package.*$//g' $newfile
 
+
+  # get the line number of "syntax" declaration
   syntaxLineNum="$(grep -n "syntax" "$newfile" | head -n 1 | cut -d: -f1)"
 
   goPackageString="option go_package = \"github.com/tokopedia/gripmock/protogen/$dir\";"
+
+  # append our own go_package delcaration just below "syntax" declaration
   sed -i "${syntaxLineNum}s~$~\n$goPackageString~" $newfile
   echo $newfile
 done

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/kr/pretty v0.2.0 // indirect
 	github.com/lithammer/fuzzysearch v1.1.1
 	github.com/stretchr/testify v1.6.1
+	github.com/tokopedia/gripmock/protogen v0.0.0 // indirect
 	golang.org/x/net v0.0.0-20201110031124-69a78807bb2b // indirect
 	golang.org/x/sys v0.0.0-20201112073958-5cba982894dd // indirect
 	golang.org/x/text v0.3.4 // indirect
@@ -19,3 +20,5 @@ require (
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
 )
+
+replace github.com/tokopedia/gripmock/protogen v0.0.0 => ./protogen