Concatenates all Swift files into one file. Used in Xcode to build a single swift distributive file. In Xcode it is done by creating an external build tool configuration.

concatenate_swift_files.sh

#!/bin/bash

#
#  Combines *.swift files into a single file. Used in Xcode to build a single swift distributive file.
#
#  Here is how to use it in Xcode:
#
#  1. Create an "External build system" target.
#  2. Click "Info" tab in target settings.
#  3. In "Build Tool" field specify the path to this script file, for example: $PROJECT_DIR/scripts/concatenate_swift_files.sh
#  4. In "Arguments" field specify the arguments, for example $PROJECT_DIR/YourSubDir $PROJECT_DIR/Distrib/Distrib.swift "// Your header"
#  5. Build the target and it will concatenate your swift files into a single swift file.
#
#  You can see an example of using the script in this project: https://github.com/evgenyneu/moa
#
#  Usage
#  ------
#
#  ./combine_swift_files.sh source_dir destination_file [optional_header_text] [remove_line_text]
#
#
#  Example
#  --------
#
#  Use in external build tool in Xcode.
#
#  Build tool:
#
#    $PROJECT_DIR/scripts/concatenate_swift_files.sh
#
#  Arguments:
#
#    $PROJECT_DIR/MyProject $PROJECT_DIR/Distrib/MyDistrib.swift "// My header" "remove this line"
#

# Handle paths with spaces (http://unix.stackexchange.com/a/9499)
IFS=$'\n'

destination=$2
headermessage=$3
remove_text=$4

if [ "$#" -lt 2 ]
then
  echo "\nUsage:\n"
  echo "   ./combine_swift_files.sh source_dir destination_file [optional_header_text] [remove text]\n"
  exit 1
fi

# Create empty destination file
echo > "$destination";
text=""
destination_filename=$(basename "$destination")

for swift in `find $1 ! -name "$destination_filename" -name "*.swift"`;
do
  filename=$(basename "$swift")

  text="$text\n// ----------------------------";
  text="$text\n//";
  text="$text\n// ${filename}";
  text="$text\n//";
  text="$text\n// ----------------------------\n\n";

  if [ -n "$remove_text" ]
  then
    filecontent="$(cat "${swift}"| sed "/${remove_text}/d";)"
  else
    filecontent="$(cat "${swift}";)"
  fi

  text="$text$filecontent\n\n";

  echo "Combining $swift";
done;

# Add header message
if [ -n "$headermessage" ]
then
  text="$headermessage\n\n$text"
fi

# Write to destination file
echo -e "$text" > "$destination"

echo -e "\nSwift files combined into $destination"

Hello!
You write content to a file with flag "-e" and if file contains line break in code (for example: var foo = "some text\n"), the script will make line break in result file and we get
var foo = "some text
"

You have to use "echo" without "-e" when write content of swift file.

I get this error message error: unable to spawn process (Permission denied) (in target 'toto' from project 'Rx') after setting a project with your " Here is how to use it in Xcode"

Xcode Version 11.2.1 (11B500)

@Adobels Make the script executable using chmod 755 YourScriptName.sh