#!/usr/bin/env bash
set -u

[ -z "$2" ] && {
  echo "Usage: $0 path/to/xcodeproj target1 target2 ..."
  echo "The script will verify that all listed targets have the exact same set of files and resources."
  echo "Tested with Xcode 9.1"
}

PBXFILE="$1/project.pbxproj"
shift

hasParameter() {
  P="$1"
  shift

  for i in "$@" ; do
    if [[ $i == "$P" ]] ; then
        return 0
    fi
  done

  return 1
}

awk '
  /isa = PBXNativeTarget/ {
    targetName=maybeTargetName;
    next;
  }

  /buildPhases = \(/ {
    inBuildPhases=1;
    targetFileGroups="";
    next;
  }

  inBuildPhases {
    if ($1 == ");") {
      inBuildPhases=0;
      print targetName targetFileGroups;
    } else {
      if ($3 == "Sources" || $3 == "Resources") {
        targetFileGroups = targetFileGroups " " $1;
      }
    }
  }

  {
    maybeTargetName=$3;
  }
' "$PBXFILE" | (

REFERENCE_TARGET=
REFERENCE_FILES=
FOUND_DIFF=0

while read -r TARGET
do
  TARGET_NAME="${TARGET%% *}"
  if ! hasParameter "$TARGET_NAME" "$@"
  then
    continue
  fi

  FILES="$(
    for HEX in ${TARGET#* }
    do
      awk '
        /isa = (PBXSourcesBuildPhase|PBXResourcesBuildPhase)/ && maybeHex == "'$HEX'" {
          found=1;
          next;
        }

        found && /files = \(/ {
          inFiles=1;
          next;
        }

        inFiles {
          if ($1 == ");") {
            found=0;
            inFiles=0;
          } else {
            split($0, parts, "[*]");
            print substr(parts[2], 2, length(parts[2])-2);
          }
        }

        {
          maybeHex=$1;
        }
      ' "$PBXFILE"
    done | sort)"

  if [ -z "$REFERENCE_FILES" ]
  then
    REFERENCE_TARGET="$TARGET_NAME"
    REFERENCE_FILES="$FILES"
  else
    DIFF="$(diff <(echo "$REFERENCE_FILES") <(echo "$FILES"))"
    if [ -n "$DIFF" ]
    then
      if [ "$FOUND_DIFF" = "0" ]
      then
        echo >&2
        echo "Some files are not added to all of these targets: $@" >&2
        echo >&2
      fi

      FOUND_DIFF=1
      echo "Diff between the file list of $REFERENCE_TARGET and $TARGET_NAME" >&2
      echo "$DIFF" >&2
      echo >&2
    fi
  fi

done
exit $FOUND_DIFF
)