remove relative paths ./ and ../ from import section

why:
  relative paths make sources inherently non-relocatable

details:
  import base is set to the nimbus directoy, so importing ./stack
  from file interpreter.nim becomes vm/stack etc.

caveat:
   a file named nimbus/strformat.nim would clash with strformat (but
   not with std/strformat)

nim.cfg

@@ -0,0 +1 @@
+path = nimbus

nimbus/vm/code_stream.nim

@@ -8,7 +8,7 @@
 import
   chronicles, strformat, strutils, sequtils, parseutils, sets, macros,
   eth/common,
-  ./interpreter/opcode_values
+  vm/interpreter/opcode_values
 
 logScope:
   topics = "vm code_stream"

nimbus/vm/computation.nim

@@ -8,11 +8,11 @@
 import
   chronicles, strformat, macros, options, times,
   sets, eth/[common, keys],
-  ../constants, ../errors, ../vm_state, ../vm_types,
+  constants, errors, vm_state, vm_types,
-  ./interpreter/[opcode_values, gas_meter, gas_costs, vm_forks],
+  vm/interpreter/[opcode_values, gas_meter, gas_costs, vm_forks],
-  ./code_stream, ./memory, ./message, ./stack, ../db/[accounts_cache, db_chain],
+  vm/code_stream, vm/memory, vm/message, vm/stack, db/[accounts_cache, db_chain],
-  ../utils/header, precompiles,
+  utils/header, precompiles,
-  transaction_tracer, ../utils
+  transaction_tracer, utils
 
 when defined(chronicles_log_level):
   import stew/byteutils

nimbus/vm/evmc_api.nim

@@ -5,7 +5,7 @@
 #  * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-import evmc/evmc, evmc_helpers, eth/common, ../constants
+import evmc/evmc, vm/evmc_helpers, eth/common, constants
 
 type
   # we are not using EVMC original signature here

nimbus/vm/interpreter.nim

@@ -6,11 +6,10 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 import
-  ./interpreter/[opcode_values, gas_meter],
+  vm/interpreter/[opcode_values, gas_meter, vm_forks]
-  ./interpreter/vm_forks
 
 import # Used in vm_types. Beware of recursive dependencies
-  ./code_stream, ./computation, ./stack, ./message
+  vm/[code_stream, computation, stack, message]
 
 export
   opcode_values, gas_meter,

nimbus/vm/interpreter/gas_costs.nim

@@ -7,8 +7,8 @@
 
 import
   math, eth/common/eth_types,
-  ./utils/[macros_gen_opcodes, utils_numeric],
+  vm/interpreter/utils/[macros_gen_opcodes, utils_numeric],
-  ./opcode_values, ./vm_forks, ../../errors
+  vm/interpreter/[opcode_values, vm_forks], errors
 
 when defined(evmc_enabled):
   import evmc/evmc

nimbus/vm/interpreter/gas_meter.nim

@@ -7,7 +7,7 @@
 
 import
   chronicles, strformat, eth/common, # GasInt
-  ../../errors, ../../vm_types
+  errors, vm_types
 
 logScope:
   topics = "vm gas"

nimbus/vm/interpreter/opcode_values.nim

@@ -5,7 +5,7 @@
 #  * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-import ./utils/macros_gen_opcodes
+import vm/interpreter/utils/macros_gen_opcodes
 
 fill_enum_holes:
   type

nimbus/vm/interpreter/opcodes_impl.nim

@@ -7,15 +7,15 @@
 
 import
   strformat, times, sets, sequtils, options,
-  chronicles, stint, nimcrypto, stew/ranges/[ptr_arith], eth/common,
+  chronicles, stint, nimcrypto, stew/ranges/ptr_arith, eth/common,
-  ./utils/[macros_procs_opcodes, utils_numeric],
+  vm/interpreter/utils/[macros_procs_opcodes, utils_numeric],
-  ./gas_meter, ./gas_costs, ./opcode_values, ./vm_forks,
+  vm/interpreter/[gas_meter, gas_costs, opcode_values, vm_forks],
-  ../memory, ../stack, ../code_stream, ../computation,
+  vm/[memory, stack, code_stream, computation],
-  ../../vm_state, ../../errors, ../../constants, ../../vm_types,
+  vm_state, errors, constants, vm_types,
-  ../../db/[db_chain, accounts_cache]
+  db/[db_chain, accounts_cache]
 
 when defined(evmc_enabled):
-  import  ../evmc_api, ../evmc_helpers, evmc/evmc
+  import vm/evmc_api, vm/evmc_helpers, evmc/evmc
 
 logScope:
   topics = "opcode impl"

nimbus/vm/interpreter/utils/macros_procs_opcodes.nim

@@ -10,13 +10,12 @@
 
 import
   macros, strformat, stint, eth/common,
-  ../../computation, ../../stack, ../../code_stream,
+  vm/[computation, stack, code_stream, memory],
-  ../../../vm_types, ../../memory,
+  vm_types, errors, vm/interpreter/[gas_meter, opcode_values],
-  ../../../errors, ../../interpreter/[gas_meter, opcode_values],
+  vm/interpreter/utils/utils_numeric
-  ../../interpreter/utils/utils_numeric
 
 when defined(evmc_enabled):
-  import ../../evmc_api, evmc/evmc
+  import vm/evmc_api, evmc/evmc
 
 proc pop(tree: var NimNode): NimNode =
   ## Returns the last value of a NimNode and remove it

nimbus/vm/interpreter/utils/utils_numeric.nim

@@ -9,7 +9,7 @@ import
   macros,
   stew/endians2, stew/ranges/ptr_arith,
   eth/common/eth_types,
-  ../../../constants
+  constants
 
 type
   # cannot use range for unknown reason

nimbus/vm/interpreter_dispatch.nim

@@ -8,8 +8,8 @@
 import
   tables, macros,
   chronicles,
-  ./interpreter/[opcode_values, opcodes_impl, vm_forks, gas_costs, gas_meter, utils/macros_gen_opcodes],
+  vm/interpreter/[opcode_values, opcodes_impl, vm_forks, gas_costs, gas_meter, utils/macros_gen_opcodes],
-  ./code_stream, ../vm_types, ../errors, precompiles, ./stack,
+  vm/code_stream, vm_types, errors, precompiles, vm/stack,
   terminal # Those are only needed for logging
 
 logScope:

nimbus/vm/memory.nim

@@ -8,8 +8,8 @@
 import
   sequtils,
   chronicles, eth/common/eth_types,
-  ../errors, ../validation,
+  errors, validation,
-  ./interpreter/utils/utils_numeric
+  vm/interpreter/utils/utils_numeric
 
 logScope:
   topics = "vm memory"

nimbus/vm/message.nim

@@ -5,7 +5,7 @@
 #  * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-import ../vm_types
+import vm_types
 
 proc isCreate*(message: Message): bool =
   message.kind in {evmcCreate, evmcCreate2}

nimbus/vm/precompiles.nim

@@ -1,7 +1,8 @@
 import
-  ../vm_types, interpreter/[gas_meter, gas_costs, utils/utils_numeric, vm_forks],
+  vm_types,
-  ../errors, stint, eth/[keys, common], chronicles, tables, macros,
+  vm/interpreter/[gas_meter, gas_costs, utils/utils_numeric, vm_forks],
-  math, nimcrypto, bncurve/[fields, groups], blake2b_f, ./blscurve
+  errors, stint, eth/[keys, common], chronicles, tables, macros,
+  math, nimcrypto, bncurve/[fields, groups], vm/blake2b_f, vm/blscurve
 
 type
   PrecompileAddresses* = enum

nimbus/vm/stack.nim

@@ -7,7 +7,7 @@
 
 import
   chronicles, strformat, strutils, sequtils, macros, eth/common, nimcrypto,
-  ../errors, ../validation
+  errors, validation
 
 logScope:
   topics = "vm stack"

nimbus/vm/transaction_tracer.nim

@@ -1,9 +1,9 @@
 import
   json, strutils, sets, hashes,
   chronicles, nimcrypto, eth/common, stint,
-  ../vm_types, memory, stack, ../db/accounts_cache,
+  vm_types, memory, vm/stack, db/accounts_cache,
   eth/trie/hexary,
-  ./interpreter/opcode_values
+  vm/interpreter/opcode_values
 
 logScope:
   topics = "vm opcode"

nimbus/vm_types.nim

@@ -8,9 +8,9 @@
 import
   tables, eth/common,
   options, json, sets,
-  ./vm/[memory, stack, code_stream],
+  vm/[memory, stack, code_stream],
-  ./vm/interpreter/[gas_costs, opcode_values, vm_forks], # TODO - will be hidden at a lower layer
+  vm/interpreter/[gas_costs, opcode_values, vm_forks], # TODO - will be hidden at a lower layer
-  ./db/[db_chain, accounts_cache]
+  db/[db_chain, accounts_cache]
 
 when defined(evmc_enabled):
   import ./vm/evmc_api