Add script to prepare multiversion structure

Makefile

@@ -47,7 +47,7 @@ docgen: deps
 	done
 
 # Regenerate proto files:
-protoc: deps
+protoc:
 	@echo "${B}${G}⇒ Cleanup old files ${R}"
 	@find . -type f -name '*.pb.go' -not -path './vendor/*' -exec rm {} \;
 

prepare.sh

@@ -0,0 +1,47 @@
+#!/bin/bash 
+
+prefix=v2
+
+if [ -z "$1" ]; then 
+    echo "usage: ./prepare.sh path/to/neofs-api"
+    exit 1
+fi 
+
+API_GO_PATH=$(pwd)
+API_PATH=$1 
+
+# MOVE FILES FROM API REPO
+cd $API_PATH
+ARGS=$(find ./ -name '*.proto')
+for file in $ARGS; do
+    dir=$(dirname $file)
+    cp -r $dir $API_GO_PATH
+done
+cd $API_GO_PATH
+
+# MODIFY FILES
+for file in $ARGS; do
+    TYPES=$(grep '^import' $file | sed 's/import\ \"\(.*\)\/.*/\1/' | sort | uniq)
+    PKG=$(grep '^package' $file | sed 's/package\ \(.*\);/\1/')
+
+    TYPES=( "${TYPES[@]}" "${PKG[@]}") # merge two arrays
+    TYPES=$(printf "%s\n" "${TYPES[@]}" | sort | uniq) # left only uniq elemetns
+
+    for t in $TYPES; do
+        sed -i "s/$t\./$t\.$prefix\./" $file
+        sed -i "s/$t\//$t\/$prefix\//" $file
+    done 
+
+    sed -i "s/^package\(.*\);/package\1.$prefix;/" $file
+    sed -i "s/go_package\(.*\)\";$/go_package\1\/$prefix\";/" $file
+
+    dir=$(dirname $file)
+    mkdir $dir/v2 2>/dev/null
+    mv $file $dir/v2
+done
+
+# COMPILE
+make protoc
+
+# REMOVE PROTO FILES
+# TO BE DONE AS NEOFS-API WILL BE STABLE